JPH044229Y2 - - Google Patents
Info
- Publication number
- JPH044229Y2 JPH044229Y2 JP7348782U JP7348782U JPH044229Y2 JP H044229 Y2 JPH044229 Y2 JP H044229Y2 JP 7348782 U JP7348782 U JP 7348782U JP 7348782 U JP7348782 U JP 7348782U JP H044229 Y2 JPH044229 Y2 JP H044229Y2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- display
- measured
- digital
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005259 measurement Methods 0.000 description 13
- 229910052754 neon Inorganic materials 0.000 description 8
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004397 blinking Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
【考案の詳細な説明】
この考案は、デジタル表示によつて電圧を表示
する簡易形のデジタル電圧計に係わり、特に正常
に動作していることが確認できるようにした正常
動作表示形のデジタル電圧計に関するものであ
る。[Detailed description of the invention] This invention relates to a simple digital voltmeter that displays voltage with a digital display, and in particular, a digital voltage meter that displays normal operation so that it can be confirmed that it is operating normally. It is related to the meter.
近年、アナログデジタル変換用の集積回路
（Ａ／Ｄ変換器）が比較的安価で市販されており、
そのため、簡易形の電圧計にも指針形のアナログ
電圧計に代えてデジタル電圧計が使用されるよう
になつてきた。 In recent years, integrated circuits for analog-to-digital conversion (A/D converters) have become commercially available at relatively low prices.
For this reason, digital voltmeters have come to be used as simple voltmeters instead of pointer-shaped analog voltmeters.
デジタル電圧計では、Ａ／Ｄ変換用の電子回路
（IC）および電圧値を表示する表示器が必要にな
るので、これらの電子回路および表示器を駆動す
るための直流電源を内蔵させることになる。 Digital voltmeters require an electronic circuit (IC) for A/D conversion and a display to display voltage values, so a DC power supply is built in to drive these electronic circuits and the display. .
ところで、このような直流電源を測定すべき電
圧源から供給するような方式にすれば、アナログ
形のメータと同様に使用することができるので便
利である。 By the way, it would be convenient if such a DC power source was supplied from the voltage source to be measured, since it could be used in the same way as an analog meter.
この考案は、かかる実状にかんがみてなされた
もので、電子回路を駆動させる直流電圧より得る
とともに、測定すべき電圧が特定の電圧より低い
場合は、表示器の測定器が正常でないことを測定
者に認識させるように正常動作表示機能を付加し
たものである。 This idea was made in view of the actual situation, and it is obtained from the DC voltage that drives the electronic circuit, and if the voltage to be measured is lower than a specific voltage, the measuring device can tell that the measuring device of the display is not normal. A normal operation display function has been added so that the system can be recognized.
以下、この考案の正常動作表示形のデジタル電
圧計について説明する。 The normal operation display type digital voltmeter of this invention will be described below.
第１図はこの考案の一実施例を示すデジタル電
圧計の回路図で、特に測定電圧を商用の交流電源
としたものである。この図において、P1，P2は
交流電圧の測定端子を示し、１はダイオードD1
〜D4からなる全波整流回路、２は後述するＡ／
Ｄ変換器および表示器の駆動直流電圧＋Ｖおよび
−Ｖを形成するための電源回路で、ダイオード
D5，ツエナーダイオードD6，D7および平滑用の
コンデンサC1，C2によつて形成されている。３
は測定電圧をＡ／Ｄ変換用のIC回路５に供給す
る電圧分圧回路で、抵抗r1〜r3およびコンデンサ
C3で形成されている。また、４はＡ／Ｄ変換用
のIC回路５に基準電圧を供給するための基準電
圧設定回路で、抵抗r4、可変抵抗r5によつて形成
される。５は測定電圧をデジタル値に変換する
Ａ／Ｄ変換用のIC回路（ICL7106）で、２重積分
方式でアナログデジタル変換するものである。６
は前記IC回路５の出力信号をデジタル値で表示
する７セグメントの表示器で、消費電力の小さい
液晶表示形が好ましい。 FIG. 1 is a circuit diagram of a digital voltmeter showing an embodiment of this invention, in which the measured voltage is a commercial AC power source. In this figure, P 1 and P 2 indicate AC voltage measurement terminals, and 1 is a diode D 1
~D Full wave rectifier circuit consisting of 4 , 2 is A/
A power supply circuit for forming the driving DC voltages +V and -V for the D converter and display.
D5 , Zener diodes D6 and D7 , and smoothing capacitors C1 and C2 . 3
is a voltage divider circuit that supplies the measured voltage to the A/D conversion IC circuit 5, which includes resistors r 1 to r 3 and a capacitor.
It is formed of C3 . Further, 4 is a reference voltage setting circuit for supplying a reference voltage to the IC circuit 5 for A/D conversion, and is formed by a resistor r 4 and a variable resistor r 5 . 5 is an A/D conversion IC circuit (ICL7106) that converts the measured voltage into a digital value, which performs analog-to-digital conversion using a double integration method. 6
is a 7-segment display that displays the output signal of the IC circuit 5 as a digital value, and is preferably a liquid crystal display type with low power consumption.
つづいて、上記の回路構成について簡単に説明
する。 Next, the above circuit configuration will be briefly explained.
まず、このデジタル電圧計で測定すべき主たる
範囲を商用交流電源とする。測定端子P1，P2間
に交流電圧を印加すると、全波整流回路１によつ
て全波整流され、電源回路２に入力される。今、
ツエナーダイオードD6，D7のツエナー電圧を６
Ｖに設定して置くと、図示の回路ではVcc＝６Ｖ，
VDD＝−６Ｖおよび０電圧がIC回路５の駆動電圧
として供給される。 First, the main range to be measured with this digital voltmeter is commercial AC power. When an AC voltage is applied between the measurement terminals P 1 and P 2 , it is full-wave rectified by the full-wave rectifier circuit 1 and input to the power supply circuit 2 . now,
Zener voltage of Zener diodes D 6 and D 7 is 6
When set to V, in the circuit shown, V cc =6V,
V DD =-6V and 0 voltage are supplied as driving voltages for the IC circuit 5.
一方、全波整流された電圧は、電圧分圧回路３
において抵抗r1，r2により分圧され、抵抗r3，コ
ンデンサC3によつてリツプル分を除去されてIC
回路５の入力端子INに入力される。この入力端
子INに入力された電圧は、基準電圧設定回路４
の可変抵抗器r5で設定された一定の基準電圧端子
ERの電圧と比較され、IC回路５内でデジタル値
に変換される。そして、デジタル値に変換された
信号は、出力端子T1，T2……Toから表示器６に
入力され、測定端子P1，P2の電圧を数字で表示
する。 On the other hand, the full-wave rectified voltage is transferred to the voltage divider circuit 3.
The voltage is divided by resistors r 1 and r 2 at the IC, and the ripple is removed by resistor r 3 and capacitor C 3 .
It is input to the input terminal IN of circuit 5. The voltage input to this input terminal IN is the reference voltage setting circuit 4.
A constant reference voltage terminal set by a variable resistor r 5
It is compared with the voltage of E R and converted into a digital value within the IC circuit 5. The signals converted into digital values are inputted to the display 6 from the output terminals T 1 , T 2 . . . To , and the voltages at the measurement terminals P 1 and P 2 are displayed numerically.
なお、IC回路５には図示しないが、２重積分
を行うための時定数、クロツク信号発生用の時定
数等を決めるコンデンサおよび抵抗が数箇所の端
子に接続され、オーバレンジを示す信号を出力す
ることもできるのである。なお、IC回路５の種
類によつては表示器６にも直流電源が供給され
る。 Although not shown in the figure, the IC circuit 5 has capacitors and resistors connected to several terminals that determine the time constant for double integration, the time constant for clock signal generation, etc., and outputs a signal indicating overrange. It is also possible to do so. Note that depending on the type of IC circuit 5, DC power is also supplied to the display 6.
このように、Ａ／Ｄ変換を行うIC回路５およ
び表示器６の駆動電源を測定すべき電圧から得る
方式では、別途に直流電源を設ける必要がなく、
指針形の電圧計と同様に使用できて便利である
が、測定電圧に応じて電源回路２のダイオード
D5を流れる電流が異なつたものになり、そのた
めツエナーダイオードD6，D7のツエナー電圧が
わずかであるが変動し、基準電圧端子ERも変動
することになる。そのため特に、測定端子P1，
P2間の電圧がある電圧より低い場合は、IC回路
５が正常な動作とならず測定誤差が急激に大きく
なる。 In this way, with the method of obtaining the driving power for the IC circuit 5 that performs A/D conversion and the display 6 from the voltage to be measured, there is no need to provide a separate DC power supply.
It is convenient because it can be used in the same way as a pointer-type voltmeter, but depending on the measured voltage, the diode of power supply circuit 2
The current flowing through D 5 will be different, so that the Zener voltage of the Zener diodes D 6 and D 7 will vary slightly, and the reference voltage terminal ER will also vary. Therefore, in particular, the measurement terminals P 1 ,
If the voltage between P2 is lower than a certain voltage, the IC circuit 5 will not operate normally and the measurement error will suddenly increase.
そこでこの考案では、さらに正常動作表示を行
うための回路７を抵抗r6，r7、可変抵抗r8および
ネオン管Ｎによつて構成している。 Therefore, in this invention, a circuit 7 for displaying normal operation is further constituted by resistors r 6 and r 7 , a variable resistor r 8 and a neon tube N.
この回路では、測定端子P1，P2間の電圧を抵
抗r6，r7および可変抵抗r8によつて分圧し、分圧
点ａの電圧が正常動作、すなわちIC回路５が例
えば２％以内の誤差精度で働いているときは、ネ
オン管Ｎの点灯電圧となるように調整してある。
そして、ネオン管Ｎの発光が、正常動作を表示す
るとともに表示器６を照らすように配置されてい
る。 In this circuit, the voltage between measurement terminals P 1 and P 2 is divided by resistors r 6 and r 7 and variable resistor r 8 , and the voltage at division point a is normal, that is, IC circuit 5 is 2%, for example. When working within the error accuracy, the voltage is adjusted so that the lighting voltage of the neon tube N is reached.
The neon tube N is arranged so that the light emitted from the neon tube N indicates normal operation and illuminates the display 6.
このように構成すると、測定端子P1，P2間の
電圧が高い場合は、前述したようにIC回路５は
十分な精度（１％位）で動作し、このときネオン
管Ｎは点灯している。しかし、測定端子P1，P2
間の電圧が低下し、IC回路５が正常に動作する
ための直流電源電圧VccおよびVDDが得られない
ときは、ネオン管Ｎが消灯し、表示器６の照明が
なくなるので、測定者は表示器６が表示している
電圧値は誤差が大きく、測定端子P1，P2の実際
の値と異なることを認識できるものである。 With this configuration, when the voltage between the measurement terminals P 1 and P 2 is high, the IC circuit 5 operates with sufficient accuracy (about 1%) as described above, and at this time the neon tube N does not light up. There is. However, the measurement terminals P 1 , P 2
When the voltage between them decreases and the DC power supply voltages V cc and V DD for normal operation of the IC circuit 5 cannot be obtained, the neon tube N turns off and the display 6 is not illuminated, so the operator It can be recognized that the voltage value displayed on the display 6 has a large error and is different from the actual value of the measurement terminals P 1 and P 2 .
第２図は表示用のネオン管Ｎに代えて発光ダイ
オードLEDとツエナーダイオードD8の直列接続
回路を使用したもので、この場合も分圧点ａの電
圧が正常動作となる電圧値になつたとき、ツエナ
ーダイオードD8を導通させるように可変抵抗r8を
調整すれば、測定端子P1，P2間の電圧が測定範
囲外に低下したとき発光ダイオードLEDが消灯
し、表示器６の照明をなくすることができる。 In Figure 2, a series connection circuit of a light emitting diode LED and a Zener diode D8 is used in place of the neon tube N for display, and in this case as well, the voltage at the voltage dividing point a has reached a voltage value that allows normal operation. If the variable resistor r 8 is adjusted to make the Zener diode D 8 conductive, when the voltage between the measurement terminals P 1 and P 2 falls outside the measurement range, the light emitting diode LED will turn off and the illumination of the display 6 will turn off. can be eliminated.
なお、交流電圧計について説明したが、測定端
子P1，P2の電圧を直接電源回路２に入力すると、
直流電圧計として動作させるとこもできることは
いうまでもない。又、発光源を消灯させる代わり
に点滅回路を使用して点滅させるようにしてもよ
い。 Although we have explained about the AC voltmeter, if the voltage of the measurement terminals P 1 and P 2 is directly input to the power supply circuit 2,
Needless to say, it can also be operated as a DC voltmeter. Further, instead of turning off the light emitting source, a blinking circuit may be used to blink the light source.
以上説明したように、この考案の正常動作表示
形のデジタル電圧計は、測定電圧の表示誤差が大
きくなつたときは、表示器の照明を兼用している
発光源が消灯し、表示器の数値が実際の測定電圧
と異なることを確実に測定者に知らせることがで
きるという利点を有するものである。 As explained above, in the normal operation display type digital voltmeter of this invention, when the display error of the measured voltage becomes large, the light emitting source that also serves as illumination of the display turns off, and the numerical value on the display is turned off. This has the advantage that the measurer can be reliably informed that the voltage is different from the actual measured voltage.
第１図はこの考案の正常動作表示形デジタル電
圧計の回路図、第２図は正常動作表示回路の他の
実施例を示す回路図である。
図中、P1，P2は測定端子、２は電源回路、３
は電圧分圧回路、４は基準電圧設定回路、５は
IC回路、６は表示器、７は正常動作を表示する
ための回路、Ｎはネオン管を示す。
FIG. 1 is a circuit diagram of the normal operation display type digital voltmeter of this invention, and FIG. 2 is a circuit diagram showing another embodiment of the normal operation display circuit. In the figure, P 1 and P 2 are measurement terminals, 2 is the power supply circuit, and 3
is a voltage divider circuit, 4 is a reference voltage setting circuit, and 5 is a voltage divider circuit.
An IC circuit, 6 a display, 7 a circuit for indicating normal operation, and N a neon tube.
Claims (1)
圧回路に入力すると共に前記電源回路の出力電圧
で駆動される集積回路によつて、前記電圧分圧回
路の出力電圧をデジタル信号に変換し、表示器に
よつて測定電圧を表示するようにしたデジタル電
圧計において、前記被測定端子間の電圧が一定値
以上になつたとき点灯する発光源によつて、前記
表示器の照明を行うようにしたことを特徴とする
正常動作表示形デジタル電圧計。 Inputting the voltage between the terminals to be measured into a power supply circuit and a voltage divider circuit, and converting the output voltage of the voltage divider circuit into a digital signal by an integrated circuit driven by the output voltage of the power supply circuit; In a digital voltmeter configured to display a measured voltage using a display, the display may be illuminated by a light emitting source that lights up when the voltage between the terminals to be measured exceeds a certain value. A normal operation display digital voltmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7348782U JPS58177877U (en) | 1982-05-21 | 1982-05-21 | Normal operation display type digital voltmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7348782U JPS58177877U (en) | 1982-05-21 | 1982-05-21 | Normal operation display type digital voltmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58177877U JPS58177877U (en) | 1983-11-28 |
| JPH044229Y2 true JPH044229Y2 (en) | 1992-02-07 |
Family
ID=30082995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7348782U Granted JPS58177877U (en) | 1982-05-21 | 1982-05-21 | Normal operation display type digital voltmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58177877U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013120078A (en) * | 2011-12-06 | 2013-06-17 | Hioki Ee Corp | Measuring device |
-
1982
- 1982-05-21 JP JP7348782U patent/JPS58177877U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013120078A (en) * | 2011-12-06 | 2013-06-17 | Hioki Ee Corp | Measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58177877U (en) | 1983-11-28 |
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