JPS5852169B2 - automatic shift recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic shift recording device, in particular, a reference voltage obtained by subtracting a predetermined deviation voltage from the full scale voltage of the recorder body, and the output voltage of the attenuator is set to the full scale voltage of the recorder body. The output of the attenuator is input directly to the recorder body until the voltage is reached, and when the output voltage of the attenuator exceeds the full scale voltage of the recorder body, the voltage obtained by subtracting the reference voltage from the output voltage of the attenuator is recorded. The recording mechanism of the recorder is automatically shifted by inputting it to the recorder body, and when the output voltage of the attenuator becomes below the reference voltage, the output of the attenuator is input directly to the recorder body to shift the recording mechanism of the recorder automatically. This invention relates to an automatic shift recording device which includes a switch circuit having hysteresis to return the shift to the original state, and allows a recording mechanism to automatically shift and record within the same measurement range by switching the switch circuit. It is something.

Conventionally, this type of recording device selects an appropriate measurement range depending on the magnitude of the measurement signal voltage and performs measurements, but when the measurement signal voltage exceeds the measurement range, the measurement range is switched and the measurement range is expanded. It is common to continue the route.

If you change the measurement range during measurement and expand the measurement range in this way, the recording of the measurement signal voltage recorded on the recording paper will shrink, resulting in a decrease in reading accuracy.Also, changing the measurement range midway through the measurement will reduce the measurement signal voltage record recorded on the recording paper. This also has the disadvantage of causing confusion when reading the recording paper.

Also, when a measurement signal voltage higher than the measurement range is input,
There are recorders that shift the recording mechanism of the recorder by subtracting the full-scale voltage of the measurement range from the measurement signal voltage, and then continue recording, but this type of recorder simply subtracts the full-scale voltage of the measurement range from the measurement signal voltage. Therefore, if measurement signal voltages near the full-scale voltage of the measurement range are input frequently, for example, as shown in Figure 1, if measurement signal voltages from A to 2 are input, the voltage will change from A to E accordingly. , from he to mouth, from ha to tohe, and from chi to two, which have the disadvantage of causing bunching.

The present invention uses a switch circuit with hysteresis to appropriately switch the connection between the output end of the attenuator and the input end of the recorder body according to the magnitude of the measurement signal voltage within the same measurement range without changing the measurement range. , an automatic shift recording device with high recording accuracy that solves the above drawbacks by shifting the recording mechanism of the recorder when the measurement signal voltage exceeds the measurement range or drops below a predetermined voltage within the measurement range. Our goal is to provide the following.

Therefore, the automatic shift recording device of the present invention is used in a recorder that measures the measurement signal voltage by switching the measurement range with respect to the measurement signal voltage and changing the resistance of the attenuator. and a subtraction circuit for subtracting the reference voltage from the output voltage of the attenuator and a switch circuit having hysteresis, one input terminal of the switch circuit having hysteresis and an output terminal of the attenuator. The other input terminal of the switch circuit having hysteresis is connected to the output terminal of the attenuator via a subtraction circuit that subtracts the reference voltage, and the output terminal of the switch circuit having hysteresis is connected to the attenuator. It is characterized in that it is connected to the recorder body and automatically shifts and records within the same measurement range.

This will be explained below with reference to the drawings from FIG. 2 onwards.

Figures 2 and 3 are principle diagrams explaining the measurement principle of the recorder.
FIG. 4 shows the configuration of an embodiment of the present invention, FIG. 5 is an explanatory diagram of the operating voltage of a switch circuit having hysteresis, FIG. 6 shows an example of recording recorded by the automatic shift recording device according to the present invention, and FIG. 7 4 shows the circuit configuration of one embodiment of the switch circuit having hysteresis shown in FIG. 4, and FIG. 8 shows the circuit structure of another embodiment of the switch circuit having hysteresis shown in FIG. 4.

In the principle diagram explaining the measurement principle of the recorder in Fig. 2,
1 is a power source, 2 is a variable resistor, 3 is a slip resistor, 4 is a galvanometer, and 5 is a measurement signal voltage V.

Now, keeping the voltage E between AB constant and moving the brush C, the resistance between AC when no current flows through the galvanometer 4 is r.
, AB is the slip resistance 3 between AB, and the measurement signal voltage 5 V is given by V-r/RXE.

Since E and R in the above equation are constant, V of the measurement signal voltage 5 is A
It can be determined by the resistance r between C and therefore the resistance r can be directly scaled.

In the principle diagram explaining the measurement principle of the recorder in Fig. 3,
1 to 3, 5 correspond to those in FIG.

6 is a chopper, 7 is an amplifier, 8 is a balanced motor, 9 is a drive winding, 10 is an excitation winding, 11 is a rotor, 12 is a power supply, 1
3 to 15 each represent a capacitor.

As is clear from the measurement principle shown in FIG. 2, continuous measurements can be made by moving the brush C over AB of the slip resistor 3 so that the galvanometer 4 shown in FIG. 2 becomes zero.

This mechanism is composed of a chopper 6, an amplifier 7, a balanced motor 8, and the like.

The deviation voltage e between the measurement signal voltage 5 V and the voltage E' of the brush C on the slip resistor 3 is converted to the power supply 12 by the chopper 6.
(The phase of this voltage differs by 180 degrees in electrical angle depending on the positive/negative sign of the deviation voltage e).

This voltage is amplified by an amplifier 7 and applied to a drive winding 9 of a balanced motor 8.

Since the voltage of the excitation winding 10 of the force balance motor 8 has a phase difference of 90 electrical degrees from the voltage of the drive winding 9, the rotor 11 of the balance motor 8 is rotated clockwise or not depending on whether the deviation voltage e is positive or negative. Rotate counterclockwise.

This rotation moves the mechanically coupled brushes C to a point of equilibrium.

When the brush C reaches the flat bar point, the deviation voltage e disappears, so the balanced motor 8 stops.

Since the brush C on the slip resistor 3 is mechanically coupled to a recording mechanism such as a pointer and a pen, a measured value can be indicated or recorded at the position of the brush C.

Here, the measurement signal voltage 5 V of the recorder main body is unified to a predetermined DC voltage by a converter such as an attenuator.

FIG. 4 shows the configuration of an embodiment of the present invention, in which reference numeral 16 is a measurement signal voltage input terminal, 17 is an attenuator, 18 is a reference voltage, and 1
Reference numeral 9 represents a subtraction circuit, 20 a switch circuit having hysteresis, 21 and 22 an input terminal, 23 an output terminal, and 24 a main body of the recorder.

The maximum input voltage, that is, the full-scale voltage of the recorder body 24 is M, and when the deviation voltage is increased to N, the reference voltage 18 becomes M-
Set to N.

The switch circuit 20 having hysteresis operates as shown in FIG.

That is, when the input voltage to the switch circuit 20 rises from a low level and reaches the full scale voltage M of the recorder main body 24, the switch circuit 20 operates and the connection state between the input terminal 22 and the output terminal 23 is opened. Input terminal 21 and output terminal 2
3 becomes connected.

When the input voltage to the switch circuit 20 drops from the voltage on MJI to M-N of the reference voltage 18, the connection between the input terminal 21 and the output terminal 23 is opened, and the input terminal 22 and the output The terminal 23 is again connected.

Since the switch circuit 20 has hysteresis in this way, when the output voltage X from the attenuator 17 rises from a low level and the output voltage X is X5M, that is, the output voltage When the voltage is below the voltage M, the output voltage X is directly input to the recorder body 24 through the input terminal 22 and the output terminal 23, and is instructed or recorded by a recording mechanism or the like.

When the output voltage X is X>M, that is, when the output voltage X from the attenuator 17 rises from a low level and exceeds the full scale voltage of the recorder main body 24, the output terminal 23 is connected to the input terminal 21 as explained above. As the state changes, the output voltage X from the attenuator 17 is reduced to a voltage of
4I, the voltage of X-(M-N) is input.

This voltage is then shifted and recorded on the recording paper of the recorder main body 24.

Next, the output voltage X from the attenuator 17 drops from a high level voltage, and the full-scale voltage M of the recorder body 24 further drops until it reaches the reference voltage M-H (X≧M-N) at the output terminal 23. is connected to the input terminal 21, the voltage X-(M-N) subtracted by the subtraction circuit 19 is input to the recorder main body 24t, and the output voltage X further drops to the reference voltage M. -N (M<M-N), the output terminal 23 is connected to the input terminal 22, so the output voltage X is directly input to the recorder main body 2jH.

As a result, the recording paper in the recorder main body 24 is shifted and recorded back to its original position.

FIG. 6 shows a recording example recorded by the automatic shift recording apparatus according to the present invention, and the above-mentioned specific example will be explained based on the recording example.

For example, the measurement signal voltage is from 0 to about 7 volts, and in this case, the recorder's measurement range is selected to be 6 volts.

Note that the full scale voltage M of the recorder body 24 is 6::1,
Assume that the voltage is 1 volt and the excursion voltage N is 1 mm IJ port.

When the measurement signal voltage of 0 to about 7 volts is inputted to the measurement signal voltage input terminal 16 in FIG. 4, it is attenuated by the resistance of the attenuator 17, and the output voltage becomes an output voltage of X=O to about 7 millivolts. .

When a measurement signal voltage of O to 6 volts is input to the measurement signal voltage input terminal 16, the output voltage X from the attenuator 17 will be O to 6.
Since the full scale voltage M of the recorder body 24 does not exceed 6 millivolts, the switch circuit 20 with hysteresis does not operate and the input terminal 22
is connected to the output terminal 23.

Therefore, the output voltage X-0 to 6 millivolts from the attenuator 17 is directly input to the recorder body 24.

FG recorded on the recording paper in FIG. 6 shows the measurement results of the measurement signal voltage of 0 to 6 volts as explained above.

When a voltage exceeding 6 volts is input to the measurement signal voltage input terminal 16, the output voltage X of the attenuator 17 also exceeds 6 millivolts, and the full-scale voltage M of the recorder body 24
=6::IJ volts is exceeded, the switch circuit 20 having hysteresis operates, and the input terminal 21 and the output terminal 23 are connected.

As a result, the output voltage X of the attenuator 17 is determined by the subtraction circuit 19 as the reference voltage M-N, which is obtained by subtracting the deviation voltage N=1 milliJ volt from the full-scale voltage M-6 millivolts of the recorder body 24.
A voltage X-5 millivolts obtained by subtracting =5 milliJ volts is input to the recorder body 24.

GHJ in FIG. 6 represents this state, and when the measurement signal voltage exceeds 6 volts, it is automatically shifted from the 6 volts of G to the H point.

Note that N' in the figure indicates a deviation voltage of 1 volt on the recorder corresponding to a deviation voltage of 1 millivolt.

Since the switch circuit 20 with hysteresis has an operating characteristic as shown in FIG. 5, the switch circuit 20 with hysteresis is operated until the output voltage The input terminal 21 and output terminal 23 of the circuit 20 are not in an open state.

Therefore, a record represented by HJK in FIG. 6 is obtained.

When the measurement signal voltage falls below 5 volts, the output voltage X is the direct recorder body 24
is input.

This automatically changes l from K to L, which indicates 5 volts in Figure 6.
This is shifted and recorded as LP along with a drop in the measurement signal voltage.

As shown in FIG. 6, a buffer band of N'-1 volts is provided for the deflection voltage on the recorder corresponding to the deflection voltage N=1 (this value can be set freely) millivolts.
Hunting of the recording mechanism of the recording apparatus as shown in HJK in FIG. 6 is suppressed for input voltages in the vicinity of the measurement signal voltage of 6 volts.

FIG. 7 shows the circuit configuration of an embodiment of the switch circuit having hysteresis shown in FIG.
Corresponds to the one in the figure.

25 is an operational amplifier, 26 is a reference voltage E1, 27 is an operational amplifier, 28 is a reference voltage E2 (E, <E2), 2
9 is a latch relay, 30 and 31 are exciting coils, 32.
33 each represents a diode.

Now, when the output voltage X from the attenuator 17 is increased from a low level, when the output voltage X is X≦E
The output is at a high level, energizing the excitation coil 31 via the diode 32, and the input terminal 22 and output terminal 23 are in a connected state.

When the output voltage X is El<X≦E2, the output of the operational amplifier 25 is at a low level, but since the latch relay 29 is used, the input terminal 22 and the output terminal 23 are still connected.

When the output voltage X is X>E2, the output of the operational amplifier 27 changes from the previous low level to the high level.

As a result, the excitation coil 30 is energized via the diode 32, and the input terminal 21 and the output terminal 23 are brought into a connected state.

Further, when the output voltage X from the attenuator 17 is lowered from a high level, when the output voltage Deenergized but latch relay 29
Therefore, the input terminal 21 and the output terminal 23 are still in a connected state.

When the output voltage X is X<El, the output of the operational amplifier 25 changes from low level to high level, energizes the excitation coil 31, and the input terminal 22 and output terminal 23 are connected again.

Therefore, the voltage E1 of the reference voltage 26 is set to MN in FIG.
If the reference voltage E2 is selected as M in FIG. 5, a switch circuit having hysteresis as shown in FIG. 5 can be obtained.

FIG. 8 shows another embodiment of the circuit configuration of the switch circuit having hysteresis shown in FIG. 4, in which 20 to 23 correspond to that in FIG. 4, and 26 and 28 correspond to that in FIG. 7.

34 and 35 are operational amplifiers, 36 is an R8 type flip-flop, 37 is an inverter circuit, 38 is a relay, 39 is an excitation coil, and 40 is an anode power terminal.

Now, when the output voltage X from the attenuator 17 is increased from a low level, when the output voltage X is X≦E1, the operational amplifier 34
Since the output of is at a low level and is input to the R terminal of the SR type rough flip-flop 36, its output Q is logic "O".

Since the logic "O" is inverted to "1" by the inverter circuit 37, the excitation coil 39 of the relay 38 is deenergized, and the input terminal 22 and the output terminal 23 are in a connected state.

When the output voltage X is El<X≦E2, the operational amplifier 34 changes from low level to high level, but the R8 type flip
The output Q of the flop 36 is still logic "0", and the connection state between the input terminal 22 and the output terminal 23 remains unchanged.

when the output voltage energize.

As a result, the input terminal 21 and the output terminal 23 are brought into a connected state.

Further, when the output voltage X from the attenuator 17 is dropped from a high level, when the output voltage X satisfies E1≦X≦E2, the output of the operational amplifier 35 changes from low level to high level, Since the output Q of the flop 36 still maintains the logic "1" state, the connection state between the input terminal 21 and the output terminal 23 is maintained.

When the output voltage X is X<El, the output of the operational amplifier 34 changes from high level to low level, so the output Q of the R8 type flip-flop 36 changes from logic "1" to rOJ, and is inverted by the inverter circuit 37. The excitation coil 39 is deenergized.

This brings the input terminal 22 and the output terminal 23 into a connected state.

Therefore, a switch circuit having hysteresis is constructed as in FIG. 7.

Considering the initial state of the switch circuit with hysteresis shown in FIGS. 7 and 8, since the output voltage X from the attenuator 17 starts from zero, the excitation coil 31 shown in FIG. Since the excitation coil 39 is deenergized, the operation starts from the state where the input terminal 22 and the output terminal 23 are connected in both cases of FIGS. 7 and 8.

The switch circuits with hysteresis shown in FIGS. 7 and 8 are merely examples, and other circuit configurations are also included.

and other elements such as ICs. This circuit also includes a switch circuit having hysteresis using a transistor or the like.

Note that the pressure M is applied to the full scale of the recorder body 24 in the above explanation.
= 6 I am explaining the IJ volt, but this value M
may be any value such as 5 millivolts, 10 millivolts, etc., and is not limited to 6 millivolts, and similarly, the deviation voltage N-1 millivolts can be arbitrarily selected.

As explained above, according to the present invention, when a measurement signal voltage higher than the measurement range is input, the recording mechanism can automatically shift and continue recording in the same range, and the switching range can be changed to make measurements. Since the recording of the signal voltage is not reduced in size, the reading accuracy is improved and the recording can be read quickly.

Since a buffer band for the excursion voltage is provided, hunting does not occur near the full scale of the measurement range, which not only provides excellent recording but also serves to protect the device itself.

In addition to recorders, it is also applicable to other measuring instruments such as oscillographs and other devices that measure analog quantities.

[Brief explanation of the drawing]

Figure 1 shows an example of recording on a recording paper when a measurement signal voltage near the full scale voltage of the measurement range is input to a conventional voltage shift recorder, and Figures 2 and 3 explain the measurement principle of the recorder. A principle diagram, FIG. 4 is a configuration of an embodiment of the present invention, and FIG. 5 is an explanatory diagram of operating voltage of a switch circuit with hysteresis.
FIG. 6 shows an example of recording recorded by the automatic shift recording device according to the present invention, FIG. 7 shows an example circuit configuration of a switch circuit having the hysteresis shown in FIG. 4, and FIG. 3 shows another example circuit configuration of a switch circuit having the switch circuit. In the figure, 17 is an attenuator, 18 is a reference voltage, 19 is a subtraction circuit, 20 is a switch circuit with hysteresis, 21, 2
2 represents an input terminal, 23 represents an output terminal, and 24 represents the main body of the recorder.

Claims (1)

[Claims] 1. In a recorder that measures the measurement signal voltage by switching the measurement range for the measurement signal voltage and changing the resistance of the attenuator, a reference voltage is obtained by subtracting the deviation voltage from the full-scale voltage of the recorder body, and A subtraction circuit that subtracts the reference voltage from the output voltage of an attenuator and a switch circuit having hysteresis are provided, one input terminal of the switch circuit having the hysteresis is connected to an output terminal of the attenuator, and the attenuator has the hysteresis. The other input terminal of the switch circuit is connected to the output terminal of the attenuator via a subtraction circuit that subtracts the reference voltage, and the output terminal of the switch circuit having hysteresis is connected to the recorder body. Shift recording device.