JP3157909B2 - Fire detector sensitivity measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensitivity measuring device for measuring the sensitivity of a fire detector used in a fire alarm system.

[0002]

2. Description of the Related Art Conventionally, when measuring the sensitivity of a smoke fire detector, an output terminal of the fire detector is provided in advance outside its housing.
There is known a method of taking out an output signal from an output terminal of a fire detector while the fire detector is installed on a ceiling surface, and measuring sensitivity based on the output signal. By doing so, it is not necessary to remove the fire detector from the ceiling surface or the like, so that the overall time required for sensitivity measurement can be shortened.

On the other hand, the output signal of the smoke fire detector changes according to the amount of smoke. However, even if the amount of smoke is the same, the output signal changes due to the contamination of the fire detector and the like. Sensitivity varies. For this, it is necessary to measure the sensitivity of the fire detector.

As a sensitivity measuring device for performing the above sensitivity measurement, an analog signal processing circuit such as an amplifier circuit and a sample hold circuit necessary for processing an output signal of a fire detector, and an analog signal resulting from the processing are provided. A sensitivity measurement device having an A / D conversion circuit for converting a digital signal into a digital signal is considered. When the measurement result is output as an analog signal, a D / A conversion circuit for converting a digital signal into an analog signal is required. .

[0005]

By the way, when the sensitivity of a fire detector is measured using a sensitivity measuring device, the operator sometimes forgets to turn off the power, and the operator sometimes forgets to turn off the power. Will discharge the internal battery,
There is a disadvantage that subsequent use may not be possible.

In order to solve this drawback, it is conceivable to measure a predetermined time after the power switch of the sensitivity measuring device is turned on, and to forcibly turn off the power only when the predetermined time has elapsed. In this case, unnecessary discharge of the built-in battery due to forgetting to turn off the power is eliminated, but even if the measurer is measuring the sensitivity, the measurement is interrupted because the sensitivity measurement device stops after a predetermined time has elapsed. At the same time, the operator must turn on the power switch again, and this operation is complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sensitivity measuring apparatus for a fire detector which can eliminate unnecessary discharge of a built-in battery due to forgetting to turn off a power supply and which does not require complicated operation of a power switch. .

[0008]

According to the present invention, there is provided a sensitivity measuring apparatus for measuring the sensitivity of a fire detector by inputting an output signal of the fire detector when a signal is not received from the fire detector for a predetermined time. In addition, the power supply to the circuit in the sensitivity measuring device or the clock supply to the circuit in the sensitivity measuring device is stopped.

[0009]

The present invention relates to a sensitivity measuring apparatus for measuring the sensitivity of a fire detector by inputting an output signal of the fire detector. Since the power supply to the circuit or the clock supply to the circuit in the sensitivity measuring device is stopped, useless discharge of the built-in battery due to forgetting to turn off the power can be eliminated, and operation of the power switch is not complicated.

[0010]

FIG. 1 is a block diagram showing the entirety of a sensitivity measuring apparatus 10 according to one embodiment of the present invention, and FIG.
It is a circuit diagram showing an example of an ionization type fire detector SEi connected to the above-mentioned embodiment.

[0011] The sensitivity measuring device 10 starts from a measuring point M1 which is an output terminal of the smoke ionization type fire detector SEi.
It receives the output signal of the sensor SEi and outputs a sensitivity value corresponding to the output signal.

In FIG. 1, a sensitivity measuring device 10 includes an MPU (microprocessor) 20 for controlling the entirety of the sensitivity measuring device 10, ROMs 21 and 22, RAMs 31, 3
2, 33, 33, 34, 35, 36, an A / D converter 41 for converting an analog signal to a digital signal, and a D / A converter 4 for converting a digital signal to an analog signal
2, an AND circuit 43, and timers TM1, TM2, TM
3, TM4 and interface IF1, IF2, IF
3, IF4, IF5 and display drivers DR1, DR
2, DR3, DR4, DR5, DR6, indicator lights L1, L2, L3, L4, L5, L6 constituted by LEDs;
Amplifier AMP that amplifies signal from fire detector SEi
, A peak hold circuit PH for holding a peak value of an output signal of the amplifier circuit AMP, a calibration reference voltage generation circuit SV, a trigger detection circuit TD, and a voltage comparison circuit VC.
, Flip-flop FF, and clock signal generation circuit C
L, switches SW1, SW2, SW3, SW4, SW
5, SW6, SW7, SW8, SW9, and SW10.

The ROM 21 is a ROM that stores the program of the flowchart shown in FIG. ROM 22
It is a ROM for storing the value of the output signal of the sensor SEi and the value of the sensitivity of the sensor SEi in association with each other.

The RAM 31 stores the digital value of the output signal of the sensor SEi. The RAM 32 stores the sensitivity value (the output signal of the sensor SEi converted based on the output signal of the sensor SEi). And a RAM 33 for storing a calibration value.
AM, RAM 34 is a RAM for storing calibration measurement values, RAM 35 is a RAM for storing average measurement values,
The RAM 36 is a RAM for storing calibration conversion values.

The A / D converter 41 converts an analog signal, which is the output signal of the sensor SEi, into a digital signal. The D / A converter 42 converts the digital signal, which is the value of the detected sensitivity, into an analog signal. Is converted to

The timer TM1 is a timer that determines a period for reading the output of the fire detector SEi.
Is a timer used to determine the type of the fire detector. The timer TM3 prohibits the input of a clock to the MPU 20 and determines the time until the start of shutting off the power supply to the amplifier circuit AMP and the like. , The timer TM2 is used to repeat a trigger to the timer TM2, and the timer TM4 is a timer that determines the period of the calibration operation.

The indicator light L1 is an LED that indicates that the photoelectric fire detector is connected to the sensitivity measuring device 10, and the indicator light L2 is that the first ionizing fire detector is connected to the sensitivity measuring device 10. The LED that indicates that the second ionization type fire detector is connected to the sensitivity measuring device 10 is an LED that indicates that the sensitivity detection device 10 is connected.
The indicator light L4 is an LED that indicates that the power is on, and an LED that indicates that the calibration operation of the A / D converter 41 and the like has been completed. LED indicating that the detected sensitivity value (measured sensitivity value) is normal, and an indicator lamp L6 is a 7-segment L indicating the searched sensitivity value.
ED. The indicator lights L1 to L6 may be display means other than LEDs, for example, a liquid crystal display device.

Drivers DR1, DR2, DR3, DR
4, DR5, DR6 are indicator lights L1, L2,
L3, L4, L5, and L6 are driven.

The switch SW1 is a switch that is turned on when measuring the sensitivity of the fire detector.
Is a switch that is turned on when measuring the sensitivity of the ion fire detector. The switch SW3 is used to measure the sensitivity of the photoelectric fire detector, to calibrate the output value of the peak hold circuit PH, and to use the amplifier AMP. The switch SW4 is turned on when calibrating the amplification of the amplifier AMP, and the switch SW4 is turned on when calibrating the amplification of the amplifier AMP. The switch SW5 is used when calibrating the output value of the peak hold circuit PH. The switch SW6 is turned on when the A / D conversion circuit 41 is calibrated, the switch SW7 is turned on when the D / A conversion circuit 42 is calibrated, and the switch SW8 is turned on. Is a switch that is turned on when measuring the sensitivity of the fire detector. The switch SW9 is an A / D conversion circuit 41 and an amplification circuit. AMP, a switch for controlling the power supply to the peak hold circuit PH, the switch SW1
A switch 0 controls the power supply to the D / A conversion circuit 42.

The calibration reference voltage generation circuit SV includes an A / D converter 41, a peak hold circuit PH, and an amplification circuit AM.
A circuit for generating a very high-precision voltage necessary for calibrating the P, D / A converter 42. A trigger detection circuit TD detects that a pulse signal is received from the fire detector. The voltage comparison circuit VC is a circuit that detects that a signal from the fire detector is equal to or higher than a predetermined voltage.

In FIG. 2A, a sensor SEi includes a constant voltage circuit VR1, an ion chamber ICM, a transistor Q, a source resistor R, and a switching circuit SWC1.
It is composed of The ion chamber ICM includes an internal ion chamber CMi in which smoke does not enter, and an external ion chamber CMo in which both ends become higher as smoke enters and the density of the smoke increases. Is connected to the gate of the transistor Q. A measuring point M1 is provided at the source of the transistor Q, which is provided on the housing of the ionizing fire detector SEi, through which the output voltage of the detector SEi is taken out, and As the smoke concentration increases, the voltage at the measurement point M1 increases.

The photoelectric fire detector SEo shown in FIG.
Is a light emitting element L, a light emitting circuit FC for controlling light emission of the light emitting element L, a light receiving element PD for receiving scattered light, and a light receiving element P
Amplifying circuit AMP for amplifying the output signal of D, constant voltage circuit VR2, switch SW, switching circuit SWC2
And the light emitting element L emits light intermittently.

FIG. 3 is a flowchart showing an outline of the operation in the embodiment of FIG.

First, the measurement point M of the fire detector SEi
1 is connected to the input terminal of the sensitivity measuring device 10, and the output terminal of the sensitivity measuring device 10 is connected to the voltmeter VM. Then, the power of the sensitivity measuring device 10 is turned on, and the MPU 20 checks the internal state of the sensitivity measuring device 10 by itself.
Calibrate A / D converter 41, peak hold circuit PH, amplifier circuit AMP, and D / A converter 42 (SA)
Then, a noise component is removed from the output signal of the fire detector SEi by performing a deviation calculation on the output signal of the fire detector SEi (SB). During the operation of the sensitivity measuring device 10, when the output signal of the fire detector SEi is not input for a predetermined time, the power is automatically turned off, the clock supply is automatically stopped, or the fire detector is turned off. When an output signal of SEi is input, an automatic power off / on control for automatically turning on a power supply or automatically starting a clock supply is performed (SC). Then, the type of the fire detector is identified based on the duration, cycle, and level of the output signal of the fire detector (SD), and the current sensitivity value of the fire detector is determined according to the type of the fire detector. Search (convert the value of the output signal of the fire detector to the value of sensitivity) (SE).

FIG. 4 is a block diagram of a part related to the operation (calibration operation) of calibrating a predetermined circuit in the above embodiment, which is extracted from the block diagram of FIG. The part of the sensitivity measuring device 10 necessary for the calibration operation is referred to as the sensitivity measuring device 1
Shown as 10.

In FIG. 4, a sensitivity measuring device 110 includes an MPU 20 for controlling the whole of the sensitivity measuring device 110,
M21,22 and RAM31,32,33,33,3
4, 36, and A for converting an analog signal to a digital signal
/ D converter 41, a D / A converter 42 for converting a digital signal into an analog signal, and timers TM1, TM
4, an interface IF2, IF4, IF5, a display driver DR4, and an indicator light L4 composed of LEDs.
And an amplifier AM for amplifying a signal from the fire detector SEi
P, a peak hold circuit PH for holding the peak of the output signal of the amplifier circuit AMP, a calibration reference voltage generation circuit SV, and switches SW1, SW2, SW3, SW4, S
W5, SW6, SW7, and SW8.

The ROM 21 is a ROM containing the program of the flowchart shown in FIG.
It is a ROM for storing a correspondence table in which values of output signals of the sensors SEi correspond to values of sensitivities of the sensors SEi.

The RAM 31 is a RAM for storing the digital value of the output signal of the sensor SEi. The RAM 32 is a RAM for detecting the sensitivity value (converted from the output signal of the sensor SEi) based on the output signal of the sensor SEi. And a RAM 33 for storing a calibration value.
AM, the RAM 34 is a RAM for storing calibration measurement values, and the RAM 36 is a RAM for storing calibration conversion values.

The A / D converter 41 converts an analog signal, which is an output signal of the sensor SEi, into a digital signal. The D / A converter 42 converts the digital signal, which is the value of the detected sensitivity, into an analog signal. Is converted to

The timer TM1 is a timer for determining a period for reading the output of the fire detector SEi.
Is a timer that determines the period of the calibration operation.

An indicator light L4 indicates that the power is on and LE indicates that the calibration operation has been completed.
D. The driver DR4 drives the indicator light L4.

The switch SW1 is a switch which is turned on when measuring the sensitivity of the connected fire detector, and the switch SW2 is a switch which is turned on when measuring the sensitivity of the ion fire detector SEi. SW3
Is a switch that is turned on when measuring the sensitivity of the photoelectric fire detector SEo, when calibrating the output value of the peak hold circuit PH, and when calibrating the amplification degree of the amplifier AMP. The switch is turned on when calibrating the degree, and the switch SW5 is
The switch SW6 is turned on when calibrating the output value of the peak hold circuit PH, the switch SW6 is turned on when calibrating the A / D conversion circuit 41, and the switch SW7 is turned on when the D / A conversion circuit 42 is calibrated. The switch that is turned on when performing calibration, and the switch SW8 is a switch that is turned on when measuring the sensitivity of the fire detector.

The calibration reference voltage generation circuit SV includes an A / D converter 41, a peak hold circuit PH, and an amplification circuit AM.
This circuit generates a very high-precision voltage required for calibrating the P / D / A converter 42, and is constituted by an IC or the like.

The MPU 20, the ROM 21 and the ROM 22 are examples of sensitivity measuring means for measuring the sensitivity of the fire detector by inputting the output signal of the fire detector. The calibration reference signal generation circuit SV includes a calibration reference signal generation circuit SV. This is an example of reference signal generating means for generating a reference signal, and includes an MPU 20 and a ROM 2.
1 is an example of a calibrating means for calibrating the measuring means based on the calibration reference signal. The measuring means to be calibrated includes an analog signal processing means for performing at least one of a signal impedance matching operation, a signal amplifying operation, and a signal holding operation, and an output from the analog signal processing means. A / that converts analog signals to digital signals
D / A conversion means and digital signal processing means for processing the digital signal output by the A / D conversion means, wherein the calibration means calibrates the digital signal output from the A / D conversion means to the digital signal processing means. Is what you do. Here, the A / D converter 41 is an example of A / D conversion means, and the MPU 20, the ROM 21, and the ROM 22 are examples of digital signal processing means for processing digital signals.

The output means for outputting the value of the measured sensitivity value includes a D / D for converting a digital signal into an analog signal.
A / D conversion means, and digital signal processing means for processing a digital signal output to the D / A conversion means.
This is for calibrating the digital signal output from the digital signal processing means to the / A conversion means. The calibration operation by the calibration means is performed every predetermined time or every time the power of the sensitivity measuring device is turned on. Further, based on the calibration result by the calibration unit, a display output or an acoustic output is output for the normal or abnormal state of the calibration, and when the calibration operation by the calibration unit is being performed, the sensitivity measurement device is externally connected to the sensitivity measurement device. And prohibiting the signal output from the sensitivity measuring device to the outside when the calibration operation is being performed by the calibration means.

Next, the calibration operation (SA) will be described.

FIGS. 5 and 6 are flowcharts showing an example of the calibration operation (SA) in the above embodiment.

First, the operation of calculating the error calibration value K _AD of the A / D converter 41 will be described. The error calibration of the A / D converter 41 is for calibrating an error due to a change in a reference voltage for the A / D converter 41.

After the initial setting (SA0), the MPU
20 turns off the switches SW1 to 5, 7, and 8 and turns on the switch SW6 (SA1), thereby supplying the reference voltage generated by the calibration reference voltage generation circuit SV to the input terminal of the A / D converter 41; The MPU 20 reads the value of the digital signal output from the A / D converter 41 and stores the read value in the RAM 31 (SA2).
An error calibration value K _AD of the A / D converter 41 is calculated based on the value stored in 1 (SA3).

The error calibration value K _AD is _calculated by the A / D converter 41.
_{Is the ratio} between the output data θ _r0 when the reference voltage V _ADr0 including no error is used and the output data θ _r1 when the reference voltage V _ADr1 including the error is used, that is, K _AD = θ _r0 / Θ _r1 (1) Accordingly, since θ _r0 = K _AD × θ _r1 (2), the error calibration value K _AD of the A / D converter 41 is obtained, and the output data when the reference voltage V _ADr0 that does not include the error is used is obtained. θ _r0 , that is, calibrated output data output data θ _r0 can be obtained.

The following method is used to calculate the error calibration value K _AD . First, the input voltage of the A / D converter 41 V _in
And then, when the reference voltage of the A / D converter 41 (voltage different from the reference voltage V _r generated by the calibration reference voltage generating circuit SV) and V _ADr, A / D converter 41 outputs the 8-bit, A The output data θ of the A / D converter 41 is θ = (V _in / V _ADr ) × 256 (3). When there is a variation in the reference voltage V _ADr of the A / D converter 41, the A / D converter The output data θ at 41 includes an error.

Here, the reference voltage including no error used for the A / D converter 41 is set to V _ADr0 , the reference voltage including the error used for the A / D converter 41 is set to V _ADr1 , and the A / D converter 41 is used. Assuming that the output data including no error in θ is θ ₀ and the output data including the error in the A / D converter 41 is θ ₁ , then from equation (3), θ ₀ = (V _in / V _ADr0 ) × 256 (256) 4) Expression, θ ₁ = (V _in / V _ADr1 ) × 256 (5) Expression, wherein the reference voltage V _r generated by the calibration reference voltage generation circuit SV is input to the A / D converter 41. In this case, _assuming that the output data when using the reference voltage V _ADr0 including no error is θ _r0 and the output data when using the reference voltage V _ADr1 including error is θ _r1 , (4), (5) from the _{equation, θ r0 = (V r /} V ADr0) × 256 ...... 6) an expression, a _{θ r1 = (V r / V} ADr1) × 256 ...... (7) equation.

Here, the error calibration value K _AD is K _AD = θ _r0 / θ _r1 from the equation (1). Therefore, when the equations (6) and (7) are substituted into the equation (1), the following equation is obtained _. = Θ _r0 / θ _r1 = {(V _r / V _ADr0 ) × 256 /｝ / {(V _r / V _ADr1 ) × 256} = V _ADr1 / V _ADr0 Equation (8) and the A / D converter 41, the output data θ _r1 when the reference voltage V _ADr1 including the error is used is multiplied by the error calibration value K _AD, and the equations (7) and (8) are substituted into the output data θ _r1 to obtain θ _r1 × K _AD = ｛( _{V r / V ADr1) × 256} } × (V ADr1 / V ADr0) = become _{(V r / V ADr0) ×} 256, to, substituting _{(6), θ r1 × K AD = (} V r / V _ADR0) becomes × 256 = θ _r0, that is, multiplied by the error calibration value K _AD to output data theta _r1 when using the reference voltage V _ADR1 including an error in the a / D converter 41 When, the output data theta _r0 when using the reference voltage V _ADR0 containing no error in the A / D converter 41. That is, the A / D converter 41
Is multiplied by the error calibration value K _AD , A / D
An output value that does not include an error of converter 41 can be obtained. By doing so, the output value of the A / D converter 41 can be calibrated.

After calculating the error calibration value K _AD of the A / D converter 41 as described above (SA3), it is checked whether the obtained error calibration value K _AD is within a predetermined range (SA).
4) If the obtained error calibration value K _AD does not fall within the predetermined range, the display lamp L4 in the lighting state also serving as the power lamp is turned off via the interface IF5 and the driver DR4 to indicate an abnormality (SA5). . If the obtained error calibration value K _AD is within a predetermined range, the obtained error calibration value K _AD is _stored in RAM.
33 (SA6), and calculates an error calibration value K _P of the peak hold circuit PH. The indicator light L4 may be used to indicate an abnormality as described above, and when all other error calibration values described later are normal, indicate that all the error calibration values are normal. You may use it as a thing.

Next, the operation of calculating the error calibration value K _P of the peak hold circuit PH will be described.

First, the MPU 20 operates the switches SW1, 2,.
By turning off the switches 4, 6 to 8 and turning on the switches SW3, 5 (SA11), the calibration reference voltage generation circuit S
The reference voltage generated at V is supplied to the input terminal of the peak hold circuit PH. At this time, the value of the digital signal output from the A / D converter 41 is read by the MPU 20, and the read value is stored in the RAM 31 (SA12). RAM3
1 based on the value stored in
Calculating the error calibration value K _P (SA13).

When the offset voltage _Vf exists in the peak hold circuit PH, an error is included in the output data of the A / D converter 41, and an error calibration value K _P necessary for removing the error is calculated. The following method is used.

The error calibration value K _P of the peak hold circuit PH is equal to the offset voltage V
the output data of the definitive A / D converter 41 _{when f} is present, multiplied by the error calibration value K _AD of the A / D converter 41, from the results this multiplied, A / D converter 41 when there is no offset voltage V _f The output data of is subtracted.

[0049] If the calibration reference voltage reference voltage V _r the peak hold circuit PH generated by the generating circuit SV has been input,
If the output data of the A / D converter 41 when the offset voltage _Vf does not exist is θ _P0, and the output data of the A / D converter 41 when the offset voltage _Vf exists is θ _P1 , θ _P0 = _{(V r / V ADr0) ×} 256 ...... (9) a type, a _{θ P1 = {(V r +} V f) / V ADr1)} × 256 ...... (10) equation.

[0050] Then, from the output data theta _P1 of definitive A / D converter 41 when the offset voltage V _f satisfies present, in order to remove errors due to the A / D converter 41, multiplied by the error calibration value K _AD to output data theta _P1 . _{That, θ P1 × K AD = {} (V r + V f) / V ADr1)} × 256 × V ADr1 / V ADr0 = {(V r + V f) / V ADr0} × 256 ...... (11) is formula .

The error calibration value K _P of the peak hold circuit PH is obtained by adding the error calibration value K _AD of the A / D converter 41 to the output data θ _P1 of the A / D converter 41 when the offset voltage _Vf exists. A / D converter 41 when there is no offset voltage _{Vf
Is obtained} by subtracting the output data θ _P0 , that is, K _P = θ _P1 × K _AD −θ _P0 (12). By substituting the equations (11) and (9) into this equation, K _{P = θ P1 × K AD -θ} P0 = {(V r + V f) / V ADr0} × 256- (V r / V ADr0) × 256 = (V f / V ADr0) × 256 ...... (13) formula become. Since the value of the offset voltage _{Vf and} the value of the reference voltage V _ADr0 that does not include an error are known, the value of the error calibration value K _P of the peak hold circuit PH can be obtained from Expression (13).

Here, when the input signal of the peak hold circuit PH is V _inp and the A / D conversion value of the input signal V _inp is θ ₂ , the peak hold circuit PH is calculated using the error calibration value K _P. To calibrate the error of That is, θ ₂ = {(V _inp + V _f ) / V _ADr0 ) _×× 256 (14), and θ ₂ −K _P = {(V _inp + V _f ) / V _ADr0 ) × 256− ( _{V f / V ADr0) × 256} = (V inp / V ADr0) × 256 ...... (15) is a formula, therefore, by using the error calibration value K _P of the peak hold circuit PH, the error of the peak hold circuit PH V
_f can be eliminated.

After calculating the error calibration value K _P of the peak hold circuit PH as described above (SA13), it is checked whether the obtained error calibration value K _P is within a predetermined range (SA).
14) If the obtained error calibration value K _P does not fall within the predetermined range, the indicator L4 is turned off to indicate an abnormality via the interface IF5 and the driver DR4 (SA5).
If the obtained error calibration value K _P is within the predetermined range, the obtained error calibration value K _P is stored in the RAM 33 (SA15),
An error calibration value K _P of the peak hold circuit PH is calculated.

Next, the operation of calculating the error calibration value K _A of the amplifier circuit AMP will be described.

First, the switches SW1, 2, 5 to 8 are turned off and the switches SW3, 4 are turned on (SA21), whereby the reference voltage generated by the calibration reference voltage generation circuit SV is applied to the input terminal of the amplifier circuit AMP. Supply, then A
The value of the digital signal output from the / D converter 41 is expressed as MP
U20 reads the data, stores the read value in the RAM 31 (SA22), and calculates the error calibration value K _A of the amplifier circuit AMP based on the value stored in the RAM 31 (SA).
23).

If there is a variation in the amplification degree of the amplifier circuit AMP, an error is included in the output data of the A / D converter 41, and the error calibration value K _A required for removing this error is calculated. Is based on the following method. Note that the error calibration value K _A of the amplifier circuit AMP is obtained by calibrating the error of the amplification degree.

The amplification degree when the amplification circuit AMP has a standard amplification degree is α ₀ , the amplification degree when the amplification degree of the amplification circuit AMP has variation is α _1, and the offset voltage of the peak hold circuit PH is Is V _f and the amplification circuit A
The A / D conversion value when the amplification degree of the MP is the standard amplification degree α ₀ is θ _a0, and the A / D conversion value when the amplification degree of the amplification circuit AMP is the amplification degree α ₁ is _Assuming θ _a1 , θ _a0 = (V _r × α ₀ / V _ADr0 ) × 256 (16) Expression θ _a1 = ｛(V _r × α ₁ + V _f ) / V _ADr1 ｝ × 256 (17) Using the error calibration value K _AD of the A / D converter 41, the reference voltage including the error used in the A / D converter 41 is calculated excluding the error due to V _ADr1 . (17)
Wherein the equation _{(8), θ a1 × K AD = [} {(V r × α 1 + V f) / V ADr1} × 256] × V ADr1 / V ADr0 = {(V r × α 1 + V f) / V _ADr0 ｝ × 256 (18) Equation (18) and the error calibration value K _{P of the} equations (18) and (13)
Is used to perform the calculation excluding the error due to the offset value. _{That, θ a1 × K AD -K P} = {(V r × α 1 + V f) / V ADr0} × 256 - (V f / V ADr0) × 256 = {(V r × α 1) / V ADr0} × 256 (19) V _r , α ₀ , V
_Since each value of _ADr0 is known, a calibration value K _A for calibrating an error due to a variation in the amplification degree of the amplifier circuit AMP is calculated using θ _a0 in Expression (16). That is, K _A = θ _a0 / (θ _a1 × K _AD −K _P ) = {(V _r × α ₀ / V _ADr0 ) × 256} / [{(V _r × α ₁ ) / V _ADr0 } × 256] = Α ₀ / α ₁ (20) In the case where the sensitivity is actually measured, the error is removed from the measured value based on the above error calibration values.

Similarly to the reference voltage V _r for calibrating the peak hold circuit PH (reference voltage generated by the calibration reference voltage generation circuit SV), the reference voltage of the amplifier circuit AMP is set to V _r.
However, the amplification degree of the amplification circuit AMP is large and the amplification circuit A
When MP is saturated, the reference voltage _Vr may be reduced to a predetermined voltage by resistance division or the like. In this case, an appropriate reference voltage value may be selected for each circuit to be calibrated by a changeover switch (not shown) or the like.

Next, the amplifier circuit AMP has an amplification degree alpha ₁ with variations, the AD conversion value theta ₃ obtained when amplifying circuit AMP to input voltage V _ina is inputted, using the calibration value K _A Calibration will be described.

The calibration of the A / D converter 41 and the peak hold circuit PH is the same as described above. The reference voltage value for A / D conversion is the standard value V _ADr0 , and the peak hold circuit PH has no offset voltage. Then, θ ₃ = ｛(V _ina × α ₁ ) / V _ADr0 ｝ × 256 (21) Equation θ ₃ × K _A = ｛(V _ina × α ₁ ) / V _ADr0 ｝ × 256 × (α ₀ / α ₁ ) = {(V _ina × α ₀ ) / V _ADr0 } × 256 (22)

Therefore, the calibration value K for the amplifier circuit AMP
_{With A} , the error of the amplifier circuit AMP can be eliminated. Sensitivity measuring apparatus 110, after calculating the amplification circuit calibration value K _A, stores the amplification circuit calibration value K _A in RAM 33 (SA26). When the calibration value is abnormal (SA2
In 4), as in the case of calibration of the A / D converter 41 and the like, a display indicating that calibration is abnormal can be made by notifying the indicator lamp L4 or the like, and the operator can be notified.

Then, the sensitivity measuring device 110 uses the MPU2
0 turns off the switches SW1 to 6, 8 and the switch SW7
Is turned on (SA31). As a result, the output signal of the D / A converter 42 is input to the A / D converter 41. At this time, the MPU 20 reads the value of the digital signal output by the A / D converter 41, stores the read value in the RAM 31 (SA32), and corrects the error of the D / A converter 41 based on the value stored in the RAM 31. The value K _DA is calculated (SA33).

That is, the input of the D / A converter 42 is ω
And the reference value for the D / A converter 42 is V _DAr ,
The conversion value V _d when the D / A converter 42 is an 8-bit converter is as follows: V _d = (ω / 256) × V _DAr (23)

Here, when the reference value V _DAr for D / A conversion has a variation _{among the} individual sensitivity measuring devices, the converted value naturally has a value including an error due to the variation and needs to be adjusted.

_Assuming that the reference value for the standard D / A converter 42 is V _DAr0 and the reference value for the D / A converter 42 having a variation from the standard value is V _DAr1 , the respective conversion values V _d0 , V _d1 is as follows: V _d0 = (ω / 256) × V _DAr0 (24) Equation V _d1 = (ω / 256) × V _DAr1 (25)

The sensitivity measuring device 110 gives a known value ω to the input of the D / A converter 42 when the D / A converter 42 is calibrated, and outputs the output of the D / A converter 42 at that time to A
It is converted by the / D converter 41. A / D converter 41
The standard value of the conversion reference value of V is _assumed to be V _ADr0, and the standard value of the conversion reference value of the A / D converter 41 having variation is V _{ADr0.
Assuming} that the standard value of the A / D conversion value at this time is θ _d0 and the value having the variation is θ _d1 , θ _d0 = (V _d0 / V _ADr0 ) × 256 = ｛(ω / 256) × V _DAr0 / V _ADr0 ｝ × 256 = ω × V _DAr0 / V _ADr0 (26) Equation θ _d1 = (V _d1 / V _ADr1 ) × 256 = ｛(ω / 256) × V _DAr1 / V _ADr1 ｝ × 256 = ω × V _DAr1 / V _ADr1 (27)

The sensitivity measuring circuit 110 uses the calibration value K _AD for the A / D converter 41 to calibrate the error due to the variation of the A / D conversion reference value of θ _d1 . That is, θ _d1 × K _AD = ω × V _DAr1 / V _ADr1 × (V _ADr1 / V _ADr0 ) = ω × V _DAr1 / V _ADr0 (28)

Next, the sensitivity measuring device 110 calculates ω,
Since V _DAr0 and V _ADr0 are known, the calibration value K _DA for calibrating the error due to the variation of the reference value for the D / A converter 42 is calculated using the known value θ _d0 . In other words, it is a _{K DA = θ d0 / (θ} d1 × K AD) = (ω × V DAr0 / V ADr0) / (ω × V DAr1 / V ADr0) = V DAr0 / V ADr1 ... (29) equation.

Here, the D / A converter 42 outputs the output value V
_When outputting _out , the D / A input value when the reference value for the standard D / A converter 42 is V _DAr0 is φ,
A case where the input value of the D / A converter 42 is calibrated corresponding to the reference value V _DAr1 for the D / A converter 42 including the actual variation will be described.

A standard relational expression that does not include an error is: V _out = φ / 256 × V _DAr0 (30)

The input value of the D / A converter 42 is set to the calibration value K
_When calibrating with _DA , the calibration input value is φ × K _DA and D /
Since the reference value for the A converter 42 is V _DAr1 , D / D
The output V _out of the A converter 42 is as follows. That is, V _out = {(φ × K _DA ) / 256} × V _DAr1 = [{φ × (V _DAr0 / V _DAr1 )} / 256] × V _DAr1 = (φ / 256) × V _DAr0 (31) The error in the output of the D / A converter 42 can be eliminated by the calibration value K _DA .

After calculating the calibration value K _DA , the sensitivity measuring device 110 stores the calibration value K _DA in the RAM 33 (SA3).
5). If the calibration value is abnormal (SA34), the A / D
As in the case of the calibration of the converter and the like, an indication that the calibration is abnormal is made by turning off the indicator lamp L4 or the like (SA2).
5) It is possible to inform the measurer. In each of the above calibration processes, the switch SW is used to eliminate the influence of the external signal.
Turn off 1 and 8.

Thereafter, the sensitivity measurement device 110 determines that the calibration value is
If normal (SA34), a calibration error is displayed.
The indicator lamp L4 is pulse-lit for a predetermined time from the lighting state (SA
36), switches SW1, 3, and 8 are turned on, and switch S
W2, 4-7 are turned off (SA40) and the process returns. And light
Electric fire detector SE_o In the case of, the timer TM1
Each time it goes up, the signal amplifier circuit AMP and peak hole
Input to the A / D converter 41 via the gate circuit PH.
The sensor output is A / D converted and stored in the RAM 31. Case
The stored A / D conversion measurement value q depends on the variation of each circuit part.
Stored in the RAM 33 because the error
Calibrated using the calibrated value, the calibrated value Q _V Is RAM34
Is stored in That is, Q_V = (Q × K_AD-K_P ) × K_A ... (32) Then, the sensitivity measuring device 110 converts the measured value to the sensitivity.
With reference to the ROM 22 storing the correspondence table to be converted into
The sensitivity measuring device 110 is connected via the D / A converter 42
Before outputting the sensitivity value, set the sensitivity so that the output value is appropriate.
The value h is calibrated and the calibrated value H_V Is stored in the RAM 36
And the value H after calibration_V To D / A converter 42
And outputs a value corresponding to the sensitivity. That is, H_V = H × K_DA ... (33). The sensitivity measurement device 110 uses a timer
This is performed every time TM1 counts up, and the timer TM
The above-mentioned calibration processing is performed every time 2 is counted up.

FIG. 7 is a diagram extracted from the block diagram of FIG. 1 in a portion related to the operation of removing noise from the output signal of the fire detector (noise removing operation) in the above embodiment. A portion of the sensitivity measuring device 10 necessary for the noise removal operation is shown as a sensitivity measuring device 210.

In FIG. 7, a sensitivity measuring device 210 includes an MPU 20 for controlling the entire sensitivity measuring device 210,
M21, 22, RAM31, 32, 35, timer T
M1, an amplifier AMP for amplifying a signal from the fire detector SEo, a peak hold circuit PH for holding a peak of an output signal of the amplifier AMP, and an A / D converter 41 for converting an analog signal into a digital signal. .

The ROM 21 is a ROM containing the program of the flowchart shown in FIG. 3, and is also a ROM containing the program of the flowchart shown in FIG. The ROM 22 is a ROM that stores the output signal value of the sensor SEo and the sensitivity value of the sensor SEo in association with each other.

The RAM 31 is a RAM for storing a digital value of an output signal of the sensor SEo. The RAM 32 is a RAM for detecting a sensitivity value (converted from the output signal of the sensor SEo) based on the output signal of the sensor SEo. And a RAM 35 for storing an average measured value R.
AM.

The timer TM1 determines a read cycle required when measuring the output signal of the fire detector.

The MPU 20, the ROM 21, and the ROM 2
2, RAM 31, RAM 32, amplifying circuit AMP, peak hold circuit PH, A / D converter 41, and timer TM
Reference numeral 1 denotes an example of a sensitivity measuring means for measuring the sensitivity of the fire detector based on measurement data obtained by measuring the output signal of the fire detector at predetermined time intervals. MPU20 and ROM2
1 and the RAM 31 extract the measurement data from the group consisting of the plurality of measurement data in the order of small deviation between the measurement values, and furthermore, the number of the measurement data is smaller than the number of the measurement data constituting the group. It is an example of an extracting means for extracting measurement data. The MPU 20, the ROM 21, and the RAM 35 are examples of an average value calculating unit that calculates an average value of the extracted measurement data. For each measurement by the sensitivity measurement means, newly obtained measurement data is added to the above group,
In addition, among the measurement data included in the group, the measurement data with the oldest measurement time (the measurement data with the longest time elapsed from the measurement time) is excluded from the group.

Next, the noise removal operation (SB) will be described.

FIG. 8 is a flowchart showing an example of the noise removal operation (SB) in the above embodiment.

In this embodiment, two measurement data having a small deviation are selected from the three measurement data, an average of the selected two measurement data is taken, and the average value is used as a measurement value from which noise has been removed. Think of it as data and use it for sensitivity measurements.

First, initialization such as setting the value of the timer TM1 to an initial value is performed (SB1), and when the timer time measured by the timer TM1 elapses (SB2), the A / D converter 41 is started, and Output signal (measurement data)
At the address “* + 0” of the RAM 31 (SB
3).

Then, the measurement data stored in the RAM 31 is moved in the RAM 31 (SB4). That is, the data D (* + 2) of the address "* + 2" is moved to the address "* + 3", and the data D (* + 1) of the address "* + 1" is moved.
(* + 1) is moved to address “* + 2”, and data D (* + 0) of address “* + 0” is transferred to address “* + 1”
Move to Note that, for example, the address “* + 2” is an address two addresses ahead of the address *, and the address * is a head address for storing the measurement data and the like.

By doing so, the data D
(* + 3), data D (* + 2), data D (* + 1)
Is determined as the above three measurement data.

If the measured data has not reached three (SB5), the process returns to SB2 and waits until three measured data are collected. When three pieces of measurement data are obtained, the difference between the three pieces of measurement data is calculated, and the calculation result is stored in the RAM 31.

That is, data D (* + 1) and data D
The absolute value of the difference from (* + 2) is calculated by the MPU 20, and the calculation result is stored in an address “* + 4” in the RAM 31.
The MPU 20 calculates the absolute value of the difference between the data D (* + 2) and the data D (* + 3), stores the calculation result at the address “* + 5” of the RAM 31, and stores the data D (* + 3) and the data D (* + 3). The absolute value of the difference from (* + 1) is calculated by the MPU 20, and the calculation result is stored in the RAM 31 at the address “* + 6”.

Then, an average of the combination of the two measurement data having the least deviation is obtained, and the average value is taken as the average measurement value D _A
And stored in the RAM 35. That is, the data D (* +
4) is less than or equal to data D (* + 5) (SB7), and if data D (* + 4) is less than or equal to data D (* + 6) (SB8), measurement data D (* + 1) and measurement data D
Calculate the average value with (* + 2) and calculate the average value D _A
(SB9), and stored in the RAM 35 (SB13).
The data D (* + 4) is equal to or less than the data D (* + 5) (SB7), and the data D (* + 4) is less than the data D (* + 4).
Larger (* + 6) than (SB 10), the measured data D (* + 1) and calculates the average value of the measured data D (* + 3), which was the average measured value D _A (SB 10), RAM
35 (SB13). On the other hand, data D (* +
4) is greater than the data D (* + 5) (SB7) and the data D (* + 5) is equal to or less than the data D (* + 6) (SB11), the measurement data D (* + 2) and the measurement data D (* + 2) * + 3) calculates the average value of the, which was the average measured value D _a (SB12), and stores it in the RAM 35 (SB1
3). Storing the average measurement value D _A to RAM 35 (SB1
3) After that, return to SB2 to obtain the next measurement data.

In the above embodiment, when the sensitivity of the fire detector is measured based on the measurement data obtained by measuring the output signal of the fire detector every predetermined time, for example, every few seconds, it comprises a plurality of measurement data. From the group to be measured, the measurement data is extracted in ascending order of the deviation, the average value of the extracted measurement data is calculated, and the sensitivity measuring means determines the sensitivity of the fire detector according to the calculated average value. Therefore, even if external noise is superimposed on the sensor output signal and input to the sensitivity measuring device during the sensitivity measurement, or the external noise is input to the sensitivity measuring device by itself, the external noise is removed, and therefore, the external noise is removed. Erroneous sensitivity determination due to noise is not performed by the sensitivity measurement device.

In SB4, every time measurement data is obtained, newly obtained measurement data is added to the above-mentioned group, and among the measurement data included in the above-mentioned group, the time from the time of measurement is the shortest. Since the elapsed measurement data is excluded from the group, the sensitivity can always be measured based on the new data.

In the above embodiment, two measurement data having a small deviation are selected from the three measurement data, an average of the selected two measurement data is taken, and the average value is used as a measurement value from which noise has been removed. Although it is considered as data and used for sensitivity measurement, it may be selected from more than three measurement data.
One or more may be selected. Also, the timer TM1
Instead of using to measure the output signal of the fire detector,
Every time the fire detector output signal (pulse signal) is input,
The output signal (pulse signal) may be measured.

The calibration of the measured values may be performed at the time of reading as described above, or may be performed after obtaining the average value.

FIG. 9 shows that, in the above embodiment, when no signal is received from the fire detector for a predetermined time, the supply of power or the clock to the circuit in the sensitivity measuring device is stopped or the signal from the fire detector is turned off. FIG. 2 is a block diagram of a portion related to an operation (auto power on / off operation) of starting power supply or a clock supply to a circuit in the sensitivity measuring device when receiving the signal, from the block diagram of FIG. 1. A portion of the sensitivity measuring device 10 required for the above-described auto power on / off operation is shown as a sensitivity measuring device 310.

In FIG. 9, a sensitivity measuring device 310 includes an MPU 20 for controlling the entire sensitivity measuring device 310,
M21, 22, RAM31, 32, fire detector SE
amplifier AMP for amplifying the signal from the amplifier o, and the amplifier circuit AM
A peak hold circuit PH for holding the peak of the output signal of P, and an A / A for converting an analog signal to a digital signal.
A D converter 41, a D / A converter 42 for converting a digital signal into an analog signal, a timer TM1 for determining a signal reading period from the fire detector SEo, and a sensitivity after receiving no signal from the fire detector SEo. A timer TM3 for determining a time for stopping power supply or clock supply to a circuit in the measuring device 310, an amplifier AMP,
Peak hold circuit PH, switch SW9 for controlling power supply to A / D converter 41, D / A converter 4
And a switch SW10 for controlling power supply to the switch 2.

The ROM 21 is a ROM containing the program of the flowchart shown in FIG.
It is a ROM that stores the output signal value of the fire detector SEo and the sensitivity value of the fire detector SEo in association with each other.

The RAM 31 is a RAM for storing an output signal of the fire detector SEo converted into a digital value, and the RAM 32 is a RAM for detecting the sensitivity value (fire detector SE) retrieved based on the output signal of the fire detector SEo. This is a RAM for storing the sensitivity value (converted from the output signal of SEo).

The voltage comparison circuit VC detects that a signal is received from the sensor SEo, compares the comparison level with the output signal of the sensor SEo, and outputs the output signal of the sensor SEo more than the comparison level. When the value of is high, a detection signal is output. The flip-flop FF receives the output signal of the voltage comparison circuit VC at a set terminal, and
A signal indicating that the timer time T of M3 has elapsed is received at the reset terminal, and when a signal from the sensor SEo is received, Hi is output.
The output of the High signal ends when the timer time T of the timer TM3 elapses after the output of the gh signal starts and the reception of the signal of the sensor SEo ends.

The voltage comparison circuit VC is an example of signal detection means for detecting a signal from a fire detector. Trigger detection circuit TD, flip-flop FF, clock signal generation circuit CL, MPU 20, ROM 21, switch SW
9. SW10 is an example of a supply stopping means for stopping power supply to a circuit in a sensitivity measuring device or clock supply to a circuit in a sensitivity measuring device when a signal from a fire detector is not received for a predetermined time. Trigger detection circuit TD, flip-flop FF, clock signal generation circuit CL, MPU2
0, ROM 21, switches SW9 and SW10 are supply start means for starting power supply to a circuit in the sensitivity measuring device or clock supply to a circuit in the sensitivity measuring device when receiving a signal from the fire detector. This is an example. In addition, the circuit in the above-mentioned sensitivity measuring device includes impedance matching of signals,
Analog signal processing means for performing at least one of signal amplification and signal holding, A / D conversion means for converting an analog signal into a digital signal, and digital signal processing means for processing a signal from the A / D conversion means D / A conversion means for converting a digital signal into an analog signal, numerical value display means,
It is at least one of the status display means.

Next, the auto power on / off operation (SC) will be described.

FIG. 10 is a time chart for explaining the auto power on / off operation (SC) in the above embodiment.

First, as shown in FIG.
10 is connected to a photoelectric fire detector SEo. When the light emitting element L emits pulse light, the photoelectric fire detector SEo
The light receiving element PD detects the reflected light from the wall surface to generate a light receiving amplified output, and the pulse signal is sent to the sensitivity measuring device 310. At time t1 in FIG. 10, when the photoelectric fire detector SEo outputs a pulse signal, the voltage comparison circuit V
C compares the comparison level with the input pulse signal,
Only when the pulse signal is higher than the comparison level, Hi
gh signal is output, whereby a trigger is applied to the timer TM3, and the timer TM3 starts counting. The flip-flop FF is set by the voltage comparison circuit VC outputting a High signal, and the flip-flop FF outputs a High signal.
W9 and SW10 are turned on, and power is supplied to the amplifier circuit AMP, the peak hold circuit PH, the A / D converter 41, and the D / A converter 42.

On the other hand, since the gate of the AND circuit 43 is opened by the output signal of the flip-flop FF, a clock is supplied from the clock signal generation circuit CL to the MPU 20, and the MPU 20 starts operating.

Then, at time t2 (the time from time t1 to t2 is earlier than the elapse of the timer time T of the timer TM3,
When the photoelectric fire detector SEo outputs a pulse-like signal during the timer time T of the timer TM3),
The voltage comparison circuit VC outputs a pulse signal again, and the timer TM3 is retriggered by the pulse signal, and the timer time T starts counting from the beginning.

By the way, when the timer time T elapses from the output of the voltage comparison circuit VC until the next output is generated (time t3), the timer TM3 outputs a count end signal. The flip-flop FF is reset, the switches SW9 and SW10 are turned off, and the amplifier AMP and the peak hold circuits PH and A
Power supply to the / D converter 41 and the D / A converter 42 is stopped. Further, since the flip-flop FF is reset, the gate of the AND circuit 43 is closed, the clock supply from the clock signal generation circuit CL to the MPU 20 is stopped, and the operation of the MPU 20 is stopped. Note that the clock supply from the clock signal generation circuit CL to the MPU 20 /
As a stopping method, the power supply to the clock signal generating circuit CL may be supplied / stopped by the output of the flip-flop FF without using the AND circuit 43.

In the embodiment shown in FIG. 9, when a signal is not received from the fire detector for a predetermined time, for example, when the fire detector is not connected, power is supplied to the circuit in the sensitivity measuring apparatus or the sensitivity is not changed. Since the supply of the clock to the circuit in the measuring device is stopped, useless discharge of the built-in battery due to forgetting to turn off the power can be eliminated. In addition, as long as a signal is received from the fire detector, the power switch does not turn off, and therefore, it is not necessary to turn on the power switch every predetermined time, and the operation of the power switch is not complicated.

Thereafter, when the photoelectric fire detector SEo is connected to the sensitivity measuring device 310, the flip-flop FF is set in the same manner as in the above operation at the time t1, so that the switches SW9 and SW10 are automatically set. Is turned on, the amplifier circuit AMP etc. starts operating,
Since the clock signal is supplied to the MPU 20 via the AND circuit 43, the MPU 20 automatically starts operating.
From this point as well, in the above embodiment, the operation of the power switch is easy.

The time t4 to t6 in FIG. 10 shows the case where the ionization type fire detector SEi is connected to the sensitivity measuring device. In this case, the ionization type fire detector SEi outputs a DC signal. Since the output is output, the sensitivity measurement device does not require the peak hold circuit PH. The operation when the ionization type fire detector SEi is connected to the sensitivity measuring device is basically the same as the operation when the photoelectric type fire detector SEo is connected to the sensitivity measuring device, except that at time t4 the fire detector Once generates an output signal, the output signal is continuously generated until time t5 when the connection is released. During that time, the timer TM3 is always triggered and the time t
5, the timer time T of the timer TM3 is counted, and at time t6 when the timer time T has elapsed, the flip-flop FF is reset, the switches SW9 and SW10 are turned off, and the amplifier circuit AMP, the peak hold circuit PH,
The power supply to the A / D converter 41 and the D / A converter 42 is stopped, the gate of the AND circuit 43 is closed, the clock supply from the clock signal generation circuit CL to the MPU 20 is stopped, and the operation of the MPU 20 is stopped. .

When the power supply to the amplifier circuits AMP, A / D converter 41, and D / A converter 42 is stopped, the main power supply of each circuit may be turned off.
Only the conversion reference power sources of the P, A / D converter 41 and D / A converter 42 may be turned off.

FIG. 11 is a diagram extracted from the block diagram of FIG. 1 in a portion related to the operation of identifying the type of fire detector (type identification operation) in the above embodiment. A portion of the sensitivity measuring device 10 necessary for the type identification operation is shown as a sensitivity measuring device 410.

Referring to FIG. 11, a sensitivity measuring device 410 comprises:
An MPU 20 for controlling the entirety of the sensitivity measuring device 410;
OMs 21 and 22, RAMs 31 and 32, an A / D converter 41 for converting an analog signal to a digital signal, a D / A converter 42 for converting a digital signal to an analog signal, timers TM1 and TM2, and an interface IF
1, IF2, IF3, IF4 and display driver DR
Indicator light L composed of 1, DR2, DR3 and LED
1, L2, L3, a peak hold circuit PH for holding the peak of the output signal of the fire detector SEo, a trigger detection circuit TD, a voltage comparison circuit VC, and a switch SW
2 and SW3.

The ROM 21 is a ROM which stores the program of the flowchart shown in FIG.
Is a ROM that stores the program of the flowchart shown in FIG. The ROM 22 stores a correspondence table in which the values of the output signals of the fire detector and the values of the sensitivity of the fire detector correspond to each other.
M, and this correspondence table is provided for each type of fire detector.

The RAM 31 stores the digital value of the output signal of the fire detector. The RAM 32 stores the sensitivity value (the output signal of the fire detector converted based on the output signal of the fire detector). RA that stores the sensitivity value)
M. The A / D converter 41 converts an analog signal, which is an output signal of the fire detector, into a digital signal, and the D / A converter 42 converts a digital signal, which is a searched sensitivity value, into an analog signal. Things.

The timer TM1 is a timer for determining a cycle for reading the output signal of the fire detector, and the timer TM2 is
This timer is used to determine the type of the fire detector, and a timer time is set to a time corresponding to a cycle of an output pulse generated by the photoelectric fire detector.

An indicator light L1 indicates that the photoelectric fire detector SEo is connected to the sensitivity measuring device 410.
The indicator light L2 is an LED that indicates that the first ionization type fire detector is connected to the sensitivity measuring device 410, and the indicator light L3 is an LED that indicates that the second ionization type fire detector is sensitive. An LED that indicates that the driver is connected to the measurement device 410, and drivers DR1, DR2, and DR3
Drive the indicator lights L1, L2, L3, respectively.

The switch SW2 is turned on when measuring the sensitivity of the ionizing fire detector SEi, and the switch SW3 is turned on when measuring the sensitivity of the photoelectric fire detector SEo.

The trigger detection circuit TD is a circuit for detecting a trigger pulse from the output signal of the fire detector in order to detect that the output signal of the fire detector has periodicity. When the ionization type fire detector is connected, the output of the fire detector is determined to determine whether the first ionization type fire detector is connected or the second ionization type fire detector is connected. The signal is compared with a predetermined comparison level.

The MPU 20, the ROM 21, the ROM 22, the timer TM2, the trigger detection circuit TD, and the voltage comparison circuit VC are examples of type identification means for identifying the type of the fire detector based on the output signal of the fire detector.

FIG. 12 is a flowchart showing an example of the type identification operation (SD) in the above embodiment.

First, initialization (SD1), the fire detector is connected to the sensitivity measuring device 410 (in FIG. 11, the ionization type fire detector SEi is connected), the switches SW2 and SW3 are turned off, and the trigger is activated. The trigger pulse in the output signal of the fire detector is detected by the detection circuit TD (SD2). If a trigger pulse is detected in the output signal of the fire detector, a timer TM2 is started when the trigger pulse is detected (SD3). If the trigger pulse has a predetermined period (SD4), the photoelectric fire is detected. It is determined that the sensor is connected to the sensitivity measuring device. That is, as shown in FIG. 13A, if a trigger pulse is detected every To time, the trigger pulse has a predetermined period, and the To time is a predetermined time.

When it is determined that the photoelectric fire detector is connected to the sensitivity measuring device, the MPU 20 turns on the switch SW3 while keeping the switch SW2 off (SD5), and detects the peak of the output signal of the fire detector. Peak hold circuit PH
Then, preparation is made for converting the held peak value (analog value) into a digital signal by the A / D converter 41. Then, the fact that the photoelectric fire detector is connected is stored in the RAM 31 to prepare for a sensitivity value search operation to be performed thereafter. Further, the indicator light L1 indicating that the photoelectric fire detector is connected is turned on (SD
7) Return.

On the other hand, even if a trigger pulse in the output signal of the fire detector is not detected (SD2) or a trigger pulse is detected in the output signal of the fire detector, the trigger pulse has a predetermined period. If not (SD4), FIG.
As shown in (2), since the output signal of the ionization type fire detector is mainly composed of a DC component, it is determined that the ionization type fire detector is connected to the sensitivity measuring device.

When it is determined that the ionization type fire detector is connected to the sensitivity measuring device, the switch SW2 is turned on while the switch SW3 is turned off (SD11), and the fire is detected without passing through the peak hold circuit PH. The output signal of the sensor is directly supplied to the A / D converter 41. Then, the output voltage of the ionization type fire detector is compared with a predetermined comparison level by the voltage comparison circuit VC (SD12). If the output voltage of the ionization type fire detector is equal to or higher than the comparison level, the first ionization type fire detector is fired. Judge that the sensor is connected,
R that the first ionizable fire detector is connected
The indicator light L2 indicating that the first ionization type fire detector is connected is turned on (SD14) to store it in the AM 31 (SD13) and prepare for the subsequent sensitivity value search operation,
To return. That is, as shown in FIG.
The first ionization type fire sensor and the second ionization type fire detector make use of the fact that the output voltage with respect to the sensitivity value of the fire detector is different from each other by utilizing the fact that they are different.

If the output voltage of the ionization type fire detector is lower than the comparison level (SD12), it is determined that the second ionization type fire detector is connected, and the second ionization type fire detector is connected. Is stored in the RAM 31 (SD15) to prepare for the sensitivity value search operation to be performed thereafter.
The indicator light L3 indicating that the second ionization type fire detector is connected is turned on (SD16), and the process returns.

In the above embodiment, the type of the fire detector is identified based on the output signal of the fire detector. Therefore, when the sensitivity of the fire detector is measured, the type of the fire detector is erroneously recognized. The cause of the erroneous measurement of the sensitivity can be eliminated.

In the above-described embodiment, the cycle of the output signal of the fire detector is detected, and the type of the fire detector is identified according to the detected cycle. May be detected, and the type of the fire detector may be identified according to the detected output duration.

In the above embodiment, which type of fire detector is connected is indicated by a display means such as an LED. However, the use of this display means may be omitted. Instead of the display means, a sound output means for outputting the identification result by sound may be used.

FIG. 14 shows that in the above embodiment, the value of the output signal of the fire detector and the sensitivity of the fire detector are stored in association with each other, and the corresponding sensitivity is detected based on the output signal from the fire detector. The part related to the operation (sensitivity search operation)
FIG. 2 is a diagram extracted from the block diagram of FIG. 1. A part of the sensitivity measurement device 10 necessary for the above-described sensitivity search is shown as a sensitivity measurement device 510.

The sensitivity measuring device 510 includes the sensitivity measuring device 51
0, and ROMs 21 and 22
, An amplifier AMP for amplifying the signal of the sensor SEi, a peak hold circuit PH, an A / D converter 41 for converting an analog signal to a digital signal, and a D / A for converting a digital signal to an analog signal. Converter 42, timer TM1, interfaces IF2, IF
And 3.

The ROM 21 is a ROM which stores the program of the flowchart shown in FIG.
Is a ROM that stores the program of the flowchart shown in FIG. The ROM 22 is a ROM that stores the value of the output signal of the sensor SEi and the value of the sensitivity of the sensor SEi in association with each other. For example, as shown in FIG. 16, the value of the output signal of the sensor SEi (the value after A / D conversion) is made to correspond to the address of the ROM 22, and the sensitivity value is stored as data corresponding to this address. . In FIG. 16, A / D
The converted value (the address of the ROM 22) and the data of the ROM 22 constitute the contents of the ROM 22, and this is a correspondence table between the value of the output signal of the sensor and the value of the sensitivity of the sensor. ROM
The address of 22 is such that the output voltage of the sensor SEi is 0.02
It is set so that it is incremented by one each time V increases. Also, in FIG.
0 is the head address for storing the correspondence table, but this head address may be set to another address.

In the correspondence table of the ROM 22, as a counterpart corresponding to the output signal value of the sensor SEi, a linear correlation value with the sensitivity value of the sensor SEi is used instead of the sensitivity value of the sensor SEi. May be set. Therefore, R
The OM 22 is an example of a storage unit that stores the value of the output signal of the fire sensor and the value of the sensitivity of the fire sensor or a linear correlation value with the sensitivity value. The “sensitivity value and linear correlation value” will be described later.

The RAM 31 is a RAM for storing the digital value of the output signal of the sensor SEi. The RAM 32 is a RAM for detecting the sensitivity value (converted from the output signal of the sensor SEi) based on the output signal of the sensor SEi. A / D converter 41 is a RAM that stores the value of the sensitivity S).
The D / A converter 42 converts an analog signal, which is an output signal of Ei, into a digital signal, and converts the digital signal, which is the searched sensitivity value, into an analog signal.

The MPU 20 and the ROM 21 are examples of search means for searching the storage means for the corresponding sensitivity value or the correlation value based on the output signal input from the fire detector and outputting the same. is there.

Next, the sensitivity search operation (SE) will be described. FIG. 15 is a flowchart showing the sensitivity search operation (SE) in the above embodiment.

First, initialization is performed (SE1), and when the timer time of the timer TM1 has elapsed (SE2),
The A / D converter 41 and the like are started, and the output value of the A / D converter 41 is calibrated with each set calibration value of the amplification circuit AMP, the peak hold circuit PH, and the A / D converter 41, and the output of the sensor SEi is calibrated. The signal is converted into a digital signal (SE3), and the calibrated digital signal is stored in the RAM 31.
(SE4). Then, by referring to the correspondence table corresponding to the type of the connected fire detector in the correspondence table of the ROM 22, the sensitivity value corresponding to the stored digital signal value is searched (the output of the detector SEi). The signal value is converted into a sensitivity value) (SE5). The sensitivity value searched in this way is stored in the RAM 32 (SE6), the D / A converter 42 is started, and a digital signal considering the set calibration value of the D / A converter 42 is supplied to the D / A converter 42. The detected sensitivity value is converted into an analog signal (S
E7) Output to the voltmeter VM.

In the voltmeter VM, the value of the sensitivity is displayed as a voltage value. Therefore, when the measurer sees the value, if [V] or [mV] of the unit is read instead of [% / m]. , The sensitivity value can be recognized, and therefore the sensitivity value can be easily and quickly recognized. That is, when the sensor SEi is present in the smoke of 0 [% / m], the relationship between the output voltage value of the sensor SEi and the sensitivity value of the sensor SEi is non-linear as shown in FIG. However, in the above embodiment, D / A
Since the relationship between the output voltage of the converter 42 (the output voltage of the sensitivity measuring device 510) and the value of the sensitivity of the sensor is linear as shown in FIG. 17, when the measurer looks at the voltmeter VM, The required sensitivity value can be immediately recognized. Note that the “sensitivity” of the fire detector SEi means that when the amount of smoke around the fire detector SEi is 0% / m, what [% / m] of smoke around the fire detector SEi increases. Switching circuit SW
It indicates whether C1 operates and issues an alarm, and changes depending on the contamination inside the ion chamber ICM. In the above embodiment, when the contamination inside the ion chamber ICM increases, the sensitivity of the fire detector SEi changes in a direction to increase, that is, in a direction to operate with a smoke density lower than the original. Similarly, the photoelectric fire detector changes in the direction of high sensitivity when dust accumulates in the dark box.

Here, the “sensitivity value and linear correlation value” means “0.1, 0.2, 0” assuming that the sensitivity value is, for example, 1, 2, 3,. .. 3, ... "," 10, 2
, 0, 30,..., And 10 ⁿ (n is an integer other than 1), "2, 4, 6,...", "3, 6,.
9, ... ", and the value of the sensitivity multiplied by a simple integer.
A simple integer n such as “3, 4, 5,...”
(N = 2 in the above case), that is,
"Sensitivity value and linear correlation value" means a value at which a normal person can obtain a sensitivity value by mental arithmetic.

The unit of the sensitivity is [% / m]. When the unit of the output signal of the sensor SEi is [V], it corresponds to the sensitivity of the sensor SEiｉ [% / m]. When the sensor SEi outputs △△△ [V], the operator can recognize the numerical value as a sensitivity value as it is when the operator views the display △△△ [V] of the voltmeter VM. in this case,
The unit of the output signal of the sensor SEi is [V],
[MV], [A], [mA], etc., and [% / foot], etc., instead of the sensitivity unit [% / m], and an ammeter, etc., instead of the voltmeter VM Other meters may be used. Also in this case, when the measurer looks at the display of the meter, the measurer can recognize the numerical value as it is as the value of the sensitivity as described above. That is, △△
Δ [Sensitivity measuring device 51]
[0 output unit], the operator can recognize the numerical value as a sensitivity value as it is when the operator views the display of the meter connected thereto.

Also, instead of the ionizing fire detector SEi, a photoelectric fire detector SEo as shown in FIG.
Is connected to the sensitivity measuring device 510, and the photoelectric fire detector S
The sensitivity of Eo may be measured. In this case, the “sensitivity” of the photoelectric fire detector SEo is the same as the “sensitivity” of the ionization fire detector SEi.

In the sensitivity measuring device 510 shown in FIG. 14, an indicator light may be provided to indicate that the retrieved sensitivity value is normal (or abnormal). This indicator light
It consists of an LED indicating that the value of the sensitivity of the fire detector is below or above a predetermined value, or within a predetermined area or outside a predetermined area. And a sound output unit such as a speaker or a buzzer for synthesizing a voice such as "" or "the sensitivity is abnormal". In addition, the sensitivity measuring device 510 may be provided with an indicator light for specifically displaying the retrieved sensitivity value.

In the above-described embodiment, the case where the sensitivity of the fire detector is checked when the fire detector detects smoke having a concentration of 0% / m is described. The same applies to the case where the sensitivity of the fire detector is checked while the smoke detector is detecting smoke.

In the above embodiment, the sensitivity measuring device 510 is connected to a smoke fire detector such as an ionization type fire detector SEi. Measuring device 5 for other fire detectors
10 may be connected to measure the sensitivity of the fire detector.

Further, in the above-described embodiment, the sensitivity measuring apparatus for searching the sensitivity value of the fire detector according to the output signal of the fire detector has been described. To a sensitivity measuring device that outputs (without converting to a value) or a function that only determines and displays whether the fire sensor is normal or not according to the value of the output signal of the fire sensor. Also, the above embodiment can be used.

In the above description relating to FIG. 7 and subsequent figures, the explanation of the operation of calibrating the measured value is omitted for convenience of explanation, but the measured value is read at the optimal time when signal processing is performed on the read measured value. May be performed.

[0144]

According to the present invention, in a sensitivity measuring device for measuring the sensitivity of a fire detector by inputting an output signal of the fire detector, when a signal is not received from the fire detector for a predetermined time, Since the power supply to the circuit in the sensitivity measurement device or the clock supply to the circuit in the sensitivity measurement device is stopped, unnecessary discharge of the built-in battery due to forgetting to turn off the power can be eliminated, and the operation of the power switch is complicated. It has the effect of not being.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a state in which a sensitivity measuring device 10 according to one embodiment of the present invention is connected to a fire detector SEi and a voltage source VM.

FIG. 2 is a circuit diagram showing an example of an ionizing fire detector SEi and a photoelectric fire detector SEo connected to the embodiment.

FIG. 3 is a flowchart showing an outline of the operation of the embodiment.

FIG. 4 is a diagram extracted from the block diagram of FIG. 1 in a portion related to an operation of calibrating a predetermined circuit (calibration operation) in the embodiment.

FIG. 5 is a flowchart showing an example of a calibration operation (SA) in the embodiment.

FIG. 6 is a flowchart illustrating an example of a calibration operation (SA) in the embodiment.

7 is a diagram extracted from the block diagram of FIG. 1 in a portion related to an operation of removing noise from a fire detector output signal (noise removing operation) in the embodiment.

FIG. 8 is a flowchart illustrating an example of a noise removal operation (SB) in the embodiment.

FIG. 9 In the above embodiment, when a signal is not received from the fire detector for a predetermined time, power supply or a clock supply to a circuit in the sensitivity measuring device is stopped or a signal is received from the fire detector. FIG. 2 is a block diagram of a part related to an operation (auto power on / off operation) of starting power supply or a clock supply to a circuit in the sensitivity measuring apparatus at times.

FIG. 10 is a time chart for explaining an auto power on / off operation (SC) in the embodiment.

11 is a diagram extracted from the block diagram of FIG. 1 in a portion related to an operation (type identification operation) for identifying a fire detector type in the embodiment.

FIG. 12 is a flowchart illustrating an example of a type identification operation (SD) in the embodiment.

FIG. 13 is a diagram showing an example of an output signal waveform of the photoelectric fire detector, an example of an output signal waveform of the ionization fire detector, and an example of an output signal characteristic of the ionization fire detector in the embodiment.

FIG. 14 is an operation (sensitivity) of storing the value of the output signal of the fire detector and the sensitivity of the fire detector in the above embodiment in association with each other and detecting the corresponding sensitivity based on the output signal from the fire detector. FIG. 2 is a diagram extracted from the block diagram of FIG. 1 for a portion related to (search operation).

FIG. 15 is a flowchart showing a sensitivity search operation (SE) in the embodiment.

FIG. 16 is a correspondence table between a value of an output signal of the fire detector and a value of sensitivity of the fire detector in the embodiment,
FIG. 3 is a diagram showing a correspondence table stored in a storage unit 22 and related data.

FIG. 17 shows a D / A converter 42 in the embodiment.
FIG. 4 is a diagram showing that the relationship between the output voltage value of the and the sensitivity value of the smoke detector is linear.

FIG. 18 shows the output voltage value of the sensor SEi and the sensor SEi.
FIG. 7 is a diagram showing a case where the relationship with the sensitivity value is nonlinear.

[Explanation of symbols]

SEi: ionized fire detector, SEo: photoelectric fire detector 10, 110, 210, 310, 410, 510: sensitivity measuring device, 20: MPU, 21, 22: ROM, 31, 32, 33, 33, 34 , 35, 36 RAM, 41 A / D converter, 42 D / A converter 42, 43 AND circuit, AMP amplifier circuit, PH peak hold circuit, SV calibration reference voltage generation circuit, TD trigger Detection circuit, VC: Voltage comparison circuit VC, TM1, TM2, TM3, TM4: Timer, IF1, IF2, IF3, IF4, IF5: Interface, L1, L2, L3, L4, L5, L6: Indicator, VM: voltmeter.

Claims (4)

(57) [Claims] 1. A sensitivity measuring device for measuring the sensitivity of a fire detector by inputting an output signal of the fire detector, wherein signal detection means for detecting a signal from the fire detector;
Supply stop means for stopping power supply to a circuit in the sensitivity measuring device or clock supply to a circuit in the sensitivity measuring device when a signal from the fire detector is not received for a predetermined time. A sensitivity measuring device for a fire detector. 2. A sensitivity measuring device for measuring the sensitivity of the fire detector by inputting an output signal of the fire detector, wherein signal detection means for detecting a signal from the fire detector;
Supply start means for starting supply of power to a circuit in the sensitivity measuring device or clock supply to a circuit in the sensitivity measuring device when receiving a signal from the fire detector;
A sensitivity measuring device for a fire detector, comprising: 3. The analog signal processing device according to claim 1, wherein the circuit in the sensitivity measuring device is an analog signal processing unit that performs at least one of impedance matching of the signal, amplification of the signal, and holding of the signal. Conversion means for converting a digital signal into a digital signal, digital signal processing means for processing a signal from the A / D conversion means, D / A conversion means for converting a digital signal into an analog signal, numerical value display means, status display means An apparatus for measuring sensitivity of a fire detector, characterized in that the apparatus is at least one of the following. 4. The fire detector according to claim 1, wherein the signal detection means detects an amplitude value, a frequency, or a duration of a signal from the fire detector. Sensitivity measuring device.