CN2277075Y - Liquid crystal digital a.c. voltage and current meter - Google Patents
Liquid crystal digital a.c. voltage and current meter Download PDFInfo
- Publication number
- CN2277075Y CN2277075Y CN 95206601 CN95206601U CN2277075Y CN 2277075 Y CN2277075 Y CN 2277075Y CN 95206601 CN95206601 CN 95206601 CN 95206601 U CN95206601 U CN 95206601U CN 2277075 Y CN2277075 Y CN 2277075Y
- Authority
- CN
- China
- Prior art keywords
- voltage
- sampler
- liquid crystal
- electric current
- current
- 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 - Fee Related
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model relates to digitally displayed voltage and current device, which is an instrument used for measuring various industrial frequency AC voltage and current, or the utility model can be arranged on a device. The utility model comprises an AC/DC conversion power supply, a voltage sampler, a current sampler, an amplifier, a measuring selective switch, a detector, an A/D converter, an LCD displayer, and a reference power supply. Owing to the additional adoption of the voltage sampler, the current sampler and the selective switch, the utility model can be used for two measurements. Owing to the adoption of a resistor wire which is 2A to 20A, or a conducting wire as a sampler, the utility model has the advantages of small volume, low weight, and low cost. A reference tube is also added, and the measuring precision of the utility model can be enhanced.
Description
The utility model relates to the measurement mechanism of a kind of alternating voltage, electric current, particularly relates to the device that can distinguish display voltage, electric current with the instrument of a digital lcd.
At present, be used to show alternating voltage or current value on switchboard or the instrument, mostly adopt the pointer instrument, and " liquid crystal digital alternating voltage, electric current dual-meter " can be more smart, little, durable use in these areas.
The purpose of this utility model is to measure alternating voltage or current value on the switchboard or on the instrument respectively with a liquid crystal digital alternating-current meter.On the required power supply of instrument, adopt electric capacity to replace transformer alternating supply voltage is carried out dividing potential drop, rectification, voltage stabilizing, so that being provided, digital watch uses.In the measurement of low current, adopt resistive element to replace D.C mutual-inductor
The technical solution of the utility model comprises direct supply, voltage or the current sampler (current sampler can use resistance, mutual inductor, iron-less core coil) of electric capacity after crosslinked, measures selector switch, detection, A/D conversion, liquid crystal digital show, reference power source.Direct supply is made up of through capacitance partial pressure, rectifier, pressure stabilization filter communication power supply, supplies with the required direct supply of instrument.The voltage sampling device is made of resistance.Current sampler can require to adopt respectively resistance, mutual inductor, iron-less core coil, provide switch to select then according to range.Do voltage, current measurement selection with switch (stirring or Push switch).In the A/D conversion, instrument provides reference voltage with prover pipe, to improve measurement stability and precision.At last by liquid crystal display.
Foregoing circuit makes a digital instrument do voltage, current measurement respectively.Again owing to adopt capacitance partial pressure that the power supply of instrument is provided, make the volume of whole instrument can be little to 8 * 8 * 3CM.On handling, adopts instrument power supply the positive negative rectifier of end points altogether, and reference voltage etc., so improved measuring accuracy, its site error is less than 1%, the full scale of voltage, electric current is:
Voltage: 2V; 20V; 200V; 2000V
Electric current: 2A; 20A; 200A; 2000A
The utility model also can be used as the plate table of the various ranges of voltage table, reometer, single-use.
Fig. 1 is a functional-block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
In Fig. 1, (1). voltage sampling device (2). current sampler (3). amplifier.(4) measuring selector switch (5). wave detector (6) .A/D changes (7). liquid crystal display (8). direct supply (9). reference power source.
In Fig. 2, voltage sampling device (1) is carried out delivering to (5) after the dividing potential drop sampling to tested voltage by R10, R2.Current sampler (2) is L1, and with resistance wire or the lead of diameter 1.5-3MM, it is taken a sample to the electric current that passes through.(3) be the U3:B amplifier, signal provides the current measurement voltage division signal by R25, R26 after amplifying.The measurement selector switch (4) of voltage, electric current is K1, and it can be to stir or push switch, selects after enter the pin 3 of U3:A behind R20, D10, D11, the C12.Wave detector (5) is U3:A, after the detection by 7106 31 pin of C4 through D3, R18, R19, C8, R7, C5 to IC1.A/D conversion (6) is IC1.Liquid crystal display (7) is the LCD026 LCD panel.Direct supply (8) by communication power supply through coupling capacitor C1 after the first voltage stabilizing of the positive and negative filtering of the positive negative rectifier of D5, D6, C7, C11, D7, D9, carry out filtering once more by R8, R22 and C10, by the voltage stabilizing once more of D8D1 provide ± 5V uses to whole instrument.Reference power source (9) by R4, D4, R15, RT2, R16, form, provide the 36 pin for referencial use power supply of reference voltage by the adjusting tap of RT2 to IC1.Liquid crystal display (7) is the LCD type.
R1, R23 are that adjusting resistance, D13, D12, D2, R3, R11, R9, R12, R13, C9, C13, the C15 of amplifier are the regulating element of detection among the figure, C3, C6, C14, C2.R6。R5 is the regulating element of A/D conversion.
Claims (3)
1, a kind of liquid crystal digital alternating voltage, electric current dual-meter, voltage sampling device (1), current sampler (2), amplifier (3), measurement selector switch (4), wave detector (5), A/D conversion (6), liquid crystal digital show (7), direct supply (8), reference power source (9), it is characterized in that:
(1), direct supply pressed, tests altogether and obtain zero point through crosslinked, the positive negative rectifier of electric capacity, bistable by communication power supply, so not disturbed by AC power;
(2), voltage sampling takes electric resistance partial pressure, makes sampler to the current sampling of 20A with lead at 2A, so easy to use, reduce volume;
(3), the measurement of making voltage, electric current with push switch selects, and accomplishes that a table is dual-purpose;
(4), in the A/D conversion, adopt prover pipe voltage for referencial use, its precision can reach 1%.
2, liquid crystal digital alternating voltage as claimed in claim 1, electric current dual-meter is characterized in that, the big electric current of also available mutual inductor sampling and measuring.
3, liquid crystal digital alternating voltage as claimed in claim 1, electric current dual-meter is characterized in that, can also do sampler with iron-less core coil when measuring big electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95206601 CN2277075Y (en) | 1995-03-18 | 1995-03-18 | Liquid crystal digital a.c. voltage and current meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95206601 CN2277075Y (en) | 1995-03-18 | 1995-03-18 | Liquid crystal digital a.c. voltage and current meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2277075Y true CN2277075Y (en) | 1998-03-25 |
Family
ID=33858482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95206601 Expired - Fee Related CN2277075Y (en) | 1995-03-18 | 1995-03-18 | Liquid crystal digital a.c. voltage and current meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2277075Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008083610A1 (en) * | 2007-01-06 | 2008-07-17 | Huabin Zhao | A current measuring device and a calibration method for the same |
| CN101246187B (en) * | 2007-02-12 | 2010-12-01 | 三星电子株式会社 | Inverter input current detecting device and method thereof |
-
1995
- 1995-03-18 CN CN 95206601 patent/CN2277075Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008083610A1 (en) * | 2007-01-06 | 2008-07-17 | Huabin Zhao | A current measuring device and a calibration method for the same |
| CN101246187B (en) * | 2007-02-12 | 2010-12-01 | 三星电子株式会社 | Inverter input current detecting device and method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201173965Y (en) | Core technical parameter automatic test system of electric project DC power source equipment | |
| CN207114635U (en) | Portable-type loop resistor test device | |
| US4908569A (en) | Transformerless line powdered digital AC voltmeter | |
| CN2277075Y (en) | Liquid crystal digital a.c. voltage and current meter | |
| CN101718517B (en) | Portable electronic plug gauge | |
| CN209606500U (en) | A kind of high side current pincers | |
| CN215263720U (en) | Tester capable of measuring contact resistance and opening and closing time of high-voltage switch | |
| CN2104453U (en) | Lightning arrester resistance current detecting instrument | |
| CN209606517U (en) | Earth resistance tester for home circuit | |
| CN201173953Y (en) | Portable double-display automatic range digital megameter | |
| CN205941713U (en) | Low output capacity current mutual inductance transformation ratio testing device | |
| CN2140514Y (en) | Steel antirot material thickness measurer | |
| CN2549438Y (en) | Digital open channel flowmeter | |
| CN215678686U (en) | Battery internal resistance measuring device | |
| CN2159025Y (en) | Liquid-crystal numerical AC voltmeter | |
| CN108535579A (en) | Reactor integrated test system | |
| CN2172874Y (en) | AC voltmeter with digital display | |
| CN211785747U (en) | Clamp-on ammeter | |
| CN210243729U (en) | Digital AC pincerlike meter circuit | |
| CN213455309U (en) | Handheld electronic thickness and distance measuring instrument | |
| CN213780237U (en) | Full-time detection device for working state of large laboratory instrument | |
| CN221550848U (en) | Double-pulse test experimental device for power device | |
| CN215641512U (en) | Hand-held transformer direct-current resistance tester | |
| CN220252032U (en) | Railway signal interlocking circuit fault detection pen | |
| CN211654060U (en) | Double-circuit contrast alternating current rectification circuit experimental instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |