JPH0317560A - Dc voltage indicator - Google Patents

Abstract

PURPOSE:To easily apply indicating graduations and to smoothly transfer a pointer from a reverse deflection state to a forward deflection state by distributing a current to an indication part in parallel when applied voltage reaches voltage generating reverse deflection in the pointer. CONSTITUTION:An indication part 4 is provided with a pointer 4a and performs the indicating operation corresponding to a supplied DC I by the pointer 4a. A shunt circuit forming means 12 forms a shunt circuit 11 in parallel to the indication part 4 corresponding to the voltage applied to the indication part 4 so as to allow the DC I to flow to the indication part 4. A DC voltage indicator 10 indicates DC voltage E to be indicated by the pointer 4a. When applied voltage V is voltage generating reverse deflection in the pointer 4a, the shunt circuit forming means 12 constitutes the DC voltage indicator 10 so as to form the shunt circuit 11. Therefore, when the polarity of the DC voltage E to be indicated changes so as to change the applied voltage V from reverse voltage to forward voltage, the pointer 4a can be smoothly transferred from a reverse deflection state to a forward deflection state. Further, the indicating graduations of the pointer 4a can be easily applied.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to direct current voltages whose polarity changes, such as the output voltage of a counting amplifier in a radiation measuring instrument, or to an O'-scale starting point 6t whose polarity does not change. DC voltage that changes to a non-zero voltage value EE b - A DC voltage indicator needle that is manually pressed to indicate a part of the voltage range of the input DC voltage, especially if the indicator scale is easy to calibrate and the indicator is This article relates to an indicator that can smoothly transition from a reverse swing state to a forward swing state. [Conventional technology] In facilities that handle radioactive materials, such as nuclear power plants, in preparation for the occurrence of an accident, etc. For example, IT rate indicating devices are used that can indicate an extremely wide range of radiation@dose rates, such as l to Ry'h, with a single device.
With this indicating device. As mentioned above, since the dose rate indication range is wide, conventionally, the radiation@measuring device b1 outputs a measurement signal corresponding to the dose rate of the radiation 1 gland measured by the measuring device using a logarithmic amplifier to calculate the logarithm of the measurement signal. Then, this DC voltage was changed to aT moving coil type 1, in which the generally used indicating pointer was thrown. I use a DC WEE indicator like the Tomoe indicator. [Problem to be solved by the invention] Conventional. In facilities handling radioactive materials, direct current 1 [
The dose rate is indicated using a Tomoe indicator, but
In this case, the dose rate of radiation incident on the radiation can measuring device is usually less than 1R/h unless an accident occurs while handling radioactive materials, so the above-mentioned dose rate indicating device can be used to measure rR/h. The DC voltage obtained by logarithmically converting the measurement signal representing the radiation @ dose rate less than h using a logarithmic amplifier has its pole tab" - always negative Vc, so the starting point of the indicator scale is zero volts. The DC voltage indicator is configured to correspond to the direct R N. pressure.The above DC voltage indicator force indicator pointer always swings out in the opposite direction and is in contact with the stop bar.Therefore, such a pointer If the state of reverse swing continues for a long period of time, the indicator needle and the strike bar will become stuck together due to the presence of oil, etc., and the radiation @ dose rate measured by the radiation measuring instrument will decrease. ga l FL/
Phenomenon 01 occurs in which the pointer does not perform the stroke rate indicating operation even if it exceeds h.

That is, the above-mentioned DC WEE indicator has a problem in that the pointer cannot smoothly transition from a reverse swing state to a forward swing state.

Therefore, in order to solve this problem, a DC voltage indicator l having the configuration shown in Figure 3 has been conventionally used. In FIG. 3, 2 is a logarithmic amplifier, la, which outputs the above-mentioned DC voltage E whose polarity is reversed as the DC voltage to be indicated by the indicator 1.
* lb is either terminal of indicator 1 to which direct current EEE is applied. 3 is a series resistor for improving nIv of the voltage indication in indicator 1. 4 is provided with a pointer 4a, and the pointer 4a6 indicates an action according to the DC electrician to be energized.
; It is a moving coil type indicator designed to perform the following operations. 5 is a semiconductor diode. DC voltage indicator! is the terminal 1 mentioned above
It consists of a series resistor 3, a diode 5, and an indicator 4 connected between terminals a and lb as shown in the figure. And then again. In Figure 3, the logarithmic amplifier 2
The K increase Il @ device 2 is configured so that when the radiation linear rate measured by the radiation measuring device 6 which inputs the measurement signal 6a becomes equal to or higher than lR,/h, the positive electrode terminal 1a{1t11 vc of the electric IIEE becomes Ori. At this time, the indicator 4 is set so that the electric current flowing through the indicator 4 causes the pointer 4abL to swing in the forward direction.
is connected.

In Fig. 3, the indicator lbz is constructed as described above, so when the positive terminal of the voltage E becomes the terminal tb side, the current 16'' is blocked by the diode 5 and becomes zero, so at this time, the indicator lbz 4a represents the dose rate I R,/h, indicator 1
Indicate the starting point of the indicator scale (not shown) in . This prevents the pointer 4a from swinging completely in the opposite direction from the starting point of the scale. It does not come into contact with a stopper (not shown) on the indicator l. 01 is a WE like this
In the E indicator 1, when the polarity of E is reversed after the positive terminal b1 of tEEE has been on the terminal 1b side for a long period of time. Guideline 4 a b”m
It is clear that the indicator swings smoothly in the forward direction, but in this indicator I, the resistance of the diode 5 has nonlinearity that changes depending on the applied voltage, and this nonlinear resistance characteristic b
Since it is customary for the numbers to vary greatly in increments of S diode}/5, there is a problem in that the above-mentioned marking of the indication scale is extremely troublesome. An object of the present invention is to generate a shunt circuit that shunts a current in parallel with the indicator 4K when the applied electric current EEv applied to the indicator 4 reaches a voltage that causes a reverse deflection of the pointer 48K, thereby eliminating the need for the diode 5. Let's do it. Thereby, the purpose is to obtain a DC voltage indicator in which the indicator scale can be easily calibrated and the phase needle 4a can smoothly transition from the reverse swing state to the forward swing state.

[Means to solve the problem]

To achieve the above purpose. According to the present invention, the indicator is provided with a pointer and the indicator performs an instruction operation according to the applied DC current; and a shunt circuit generating means for generating a shunt circuit in parallel to the indicating section according to the voltage, and the direct current voltage indicator indicates a direct current IEEE to be indicated by the pointer. No. 111, the shunt circuit generating means collects the DC voltage pointer so as to generate the shunt circuit when the applied voltage is a voltage that causes a reverse deflection in the pointer.

[Effect]

If configured as above. Mark rJn1! The positive QC pressure causes a reverse deflection in the pointer (hereinafter, this voltage will be referred to as the reverse WEE
The applied voltage that causes forward deflection in the pointer is called the applied voltage I.
The forward voltage of EaE is 6S. ), a shunt circuit is generated in parallel to the indicator. In this case, if the resistance of the shunt circuit is made very small compared to the resistance of the indicator, the current flowing to the indicator due to the reverse voltage described in Section 7 will become very small, and the pointer will often cause a large reverse deflection. The pointer does not come into contact with the above-mentioned reverse direction swing-out prevention stopper, and therefore the pointer does not touch the direct current. ! Is the polarity of the pressure the same as the mark tJO? ! Reverse pressure fft! When changing from E to forward voltage, the pointer can smoothly transition from the reverse swing state to the J'Fi swing state. Also, if the DC voltage indicator needle is configured as shown above. The above-mentioned diode 5 for preventing backward deflection of the pointer
Since this is not necessary, a direct current proportional to the direct current voltage to be indicated can be passed through the indicating section, and therefore the indicating scale indicated by the pointer can be calibrated extremely easily.

〔Example〕

Figure i is a diagram showing the configuration of the first embodiment of the present invention, and the main differences from Figure 3 are as follows. The diode 5 shown in FIG. 3 is not provided, and the polarity of the applied voltage V. Therefore, by detecting the polarity of the referent DC tEEE. Binary signal 7 which becomes L level when E has a polarity that makes V a forward voltage, and becomes H level when E has a polarity that makes V a reverse voltage.
A comparator 7 which outputs a is provided, and an NPN transistor 9 which turns on and shorts the indicator 4 when the binary signal 7a is input to the base 9a via the resistor 8 and reaches the signal 7a6ZH level. is provided. in this case. Of course, Transis 49
is configured to be turned off when the signal 7a is at L level. 10 is a DC voltage indicator consisting of the parts shown in Figure 1 except for the logarithmic amplifier 2.
b is the terminal of the indicator 10 to which the indicated direct current EEE is input; in this case! Oa is the voltage E and the voltage EEV is forward 'I
This is the terminal to which the positive electrode of E is applied when the polarity is set to 1 (E).

Indicator! Since O is configured as described above, terminal 1
When the 01K positive electrode is applied between the polarity @ FEE b” and one terminal toa.tob, the transistor Lg9
Since fg is in the off state, a DC current proportional to the voltage E flows sequentially through the series resistor 3 and the indicator 4. This result guideline 4
A performs the instructed motion according to the work. However. The polarity of t8EE is reversed and applied [EEV is reversed! ．． When it comes to 8E. At this time, the output signal 7a of the converter 7 becomes H level and the transistor 49U1 is turned on. A current based on the voltage E is transmitted to the indicator 4 and . The current flows through a shunt circuit it consisting of an emitter 9b and a collector 9C of the transistor 9, and in this case, the transistor 9 operates as a reverse-connected transistor in which the emitter 9b operates as a collector and the collector 9C operates as an emitter. However. In this case, the shunt circuit l! The resistance of the indicator 4 is 4 compared to the resistance of
Since p is always formed large. Most of the current based on tEEE flows through the shunt circuit II, and the current flowing through the indicator 4 is very small. Therefore, although the pointer 4a performs a reverse swing operation, the degree of the reverse swing is small and it rarely comes into contact with the above-mentioned reverse direction stopper on the pointer 4a, bZ indicator 4. That is, in the indicator 10. Direct current target 8E
Even if E is applied [, EEV has a polarity that makes it a reverse voltage, pointer 4 B I! l'' - Since it does not hit the above-mentioned stomper, when the polarity of the voltage EEE changes so that ■ becomes a forward voltage after the voltage ■ has been a reverse voltage for a long time. Pointer 4a/l'' - It is possible to transition from a reverse swing state to a forward swing state extremely smoothly. Then, in the indicator 10, the diode 5 in %Fig.
Since there is no nonlinear element such as E is 1! The current I6'' compared to E when the polarity becomes
- Since the current flows through the indicator 4, the above-mentioned indicator scale in the indicator 1 indicated by the pointer 4a can be calibrated quite easily.

In FIG. 1, since the comparator 7, resistor 8, and transistor 9 are configured as IC fJ as described above,
With these three people. lcfi so that the current I flows through the instruction section 4.
Direction unit VCη generates a shunt circuit 1L in parallel to the indication unit 4 according to the input voltage 1fEEV, or a thousand-stage shunt circuit
It is possible to say that b1 is composed of 2. In addition, in FIG. 1K, transistor 9 is operated as a reverse-connected transistor. In this case, the transistor 49
There is an advantage that the resistance of the shunt circuit 11 is smaller than when using a normally connected transistor, and the reverse swing of the pointer can be reduced. In the present invention, a VC forward-connected transistor may be used instead of the reverse-connected transistor 49. Figure vg2 is a configuration diagram of the second embodiment of the present invention. The first part of this figure
The difference from the diagram is between the resistor 8 and transistor 9 and the VC. Relay coil l3 driven by output signal 7a of converter 7; A B contact 14 is driven by the coil l3 and shorts both ends of the indicator 4 when the coil l3 is not excited, and opens both ends of the indicator 4 when the coil l3 is energized. It is. Reference numeral 15 denotes a DC voltage indicator consisting of the illustrated parts except for the logarithmic amplifier 2.

The indicator 15 is set to Km as described above, so the voltage E
The positive electrode of is applied to the terminal 151 of the indicator l5, and the voltage a:V
When is a forward voltage. Since the comparator output signal 7a becomes L level and the coil 13 is excited, the contact 14 becomes ``O''. Therefore, the DC current ``■'' sequentially flows through the resistor 3 and the indicator 4. -Kite.
At this time, the pointer 4a performs an indicating operation according to the voltage E. However, when the positive electrode of E is applied to terminal 15b of indicator 15 and voltage V becomes a reverse voltage, signal 7a becomes H level and coil 13 becomes de-energized &BK, so contact 14
is turned on, and both ends b of the indicator 4 are short-circuited at the contact 14, which has an extremely smaller resistance than the resistance of the indicator. Also in indicator 15, voltage E is opposite to voltage V by 1! When the polarity becomes positive, the reverse deflection b1 of the pointer 4a is very small and the pointer 4a does not come into contact with the stopper mentioned above. When the pointer 4m is to be brought into a forward swinging state after the pointer 4a has been in a backward swinging state for a long period of time, the pointing operation from the backward swinging to the forward swinging of the pointer 4a can be performed very smoothly. Then, in the case of indicator l5,
Same as for indicator 10. It is obvious that it is easy to calibrate the indicator scale indicated by the pointer.

In indicator 15. Each part is constructed as described above. The on-state contact l4 forms a shunt circuit l6 for the indicator 4K, and... The converter 7, the coil 13, and the contact 14 generate a shunt circuit 16 in parallel to the indicator 4 in response to the applied lightning EVK applied to the indicator 4 so that the direct current flows through the indicator 4K. It turns out that l7 is configured. In the above-mentioned embodiment, the target DC voltage E was a female transmission whose polarity changed, but in the present invention, the voltage E is a DC current within its changing region. 1 that includes the zero voltage B, which is represented by the starting point of the scale of the pressure indicator. It may be pressure. in this case. In the present invention, the shunt circuit generation means corresponding to the shunt circuit raw bottom means 12.17 detects the voltage EEE or the voltage V, and when the detection result is k voltage so as to cause a reverse deflection in the pointer 4m, the shunt circuit is shunted. The shunt circuits corresponding to the circuits 11 and 16 are constructed in parallel to the indicating section 4. Also. In the above-mentioned actual example, the indicator 4 is of the moving coil type, but the present invention is configured so that the indicator 4a performs the instruction operation according to one electric current worker using a mechanism other than the moving coil type. It can also be applied to a DC voltmeter having an indicator.

〔Effect of the invention〕

As mentioned above. In the present invention, a pointer O''--a pointing part is provided and the pointer performs a pointing operation according to the applied DC current, and a pointing part is added to the pointing part so as to cause the first current of DC to flow through the pointing part. A DC TILEE indicator that indicates a target DC current voltage with a pointer, and includes a shunt circuit generating means that generates a shunt circuit in parallel to the indicating section in response to the applied rW!E. EE
b''-The K DC voltage indicator was configured to generate a shunt circuit if the voltage caused reverse deflection of the pointer.

For this reason. When the structure is modified as described above, when the applied voltage reaches the voltage Krj that causes reverse deflection of the pointer, a shunt circuit is placed in parallel with the indicator VC, and in this case, the resistance of the shunt circuit is made much smaller than the resistance of the indicator. If it is set to a small value, the current flowing through the indicator K due to the above-mentioned reverse electric current FEK will be very small, so the pointer will not cause a large reverse deflection, and the pointer will be less likely to come into contact with the aforementioned reverse direction deflection prevention stop collar. Therefore, according to the present invention, when the polarity of the direct R voltage to be referred to changes from the reverse voltage to the forward direction [EEK], the pointer 6'' smoothly changes from the reverse swing state to the forward swing state. It has the effect of allowing transition.Also,
If the DC voltage indicator is configured as shown in the above. Since the diode 5 mentioned above to prevent backward deflection of the pointer is unnecessary, the indicator pair S! It is possible to flow a direct current proportional to the direct current voltage into the indicating section b''-, and therefore, according to the present invention, the pointer b; has the effect that the marking of the indicating scale for indicating can be performed extremely easily.6''- .

4.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of the first embodiment of the present invention. FIG. 2 is a block diagram of a second embodiment of the present invention, and FIG. 3 is a block diagram of a conventional DC [FE indicator]. 1. 10. 15.--DC IFEE indicator,
4... Instruction section. 4a...Guidelines. 11.
16...Diversion circuit, l2. l7...... Shunt circuit generating means. E: Direct current target. V
Ivy paper note 2 diagram

Claims (1)

[Claims] 1) An indicator provided with a pointer, in which the pointer performs an instruction operation in accordance with the applied DC current; A direct current voltage indicator comprising: a shunt circuit generating means for generating a shunt circuit in parallel with the indicating section, the direct current voltage indicator indicating the indicated target DC voltage by the pointer, wherein the shunt circuit generating means includes a shunt circuit generating means that generates a shunt circuit in parallel with the pointer; A DC voltage indicator that generates the shunt circuit when the voltage causes a reverse swing.