CN2173959Y - Digital indicating multirange electrometer - Google Patents
Digital indicating multirange electrometer Download PDFInfo
- Publication number
- CN2173959Y CN2173959Y CN 93242421 CN93242421U CN2173959Y CN 2173959 Y CN2173959 Y CN 2173959Y CN 93242421 CN93242421 CN 93242421 CN 93242421 U CN93242421 U CN 93242421U CN 2173959 Y CN2173959 Y CN 2173959Y
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- CN
- China
- Prior art keywords
- voltage
- multirange
- switch
- electrometer
- volts
- 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
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Abstract
The utility model belongs to a digital indicating multirange electrometer, which particularly a multirange electrometer which has the functions of measuring voltage, detecting switching and checking live wire without contact. The characteristics of the utility model are disposed in the figure one, and (1) is a test probe which is in a screw shape. (5) is an assistant test jack, (4) is a multirange liquid display screen, and (6) is a handle pole. (7) is a converting switch with a measuring function, and the converting switch has three steps of induction, switch and voltage. (8) is a voltage range converting switch which has three steps of 110 volts, 220 volts and 330 volts, and (10) is conductive rubber. (11) is a voltage divider which is composed of a resistor network. (13), (14), (15) are bidirectional voltage stabilizing elements, and (17) is a button cell. All elements are installed on a printed circuit board. The utility model has the advantages of compact structure, quantitative subdivided voltage, convenient use, etc.
Description
The present invention relates to a kind of digital display voltage multirange electricity measurer, particularly a kind of liquid crystal number shows voltage determination, and break-make detects, the contactless multirange electricity measurer of looking into function such as live wire.
Common electricity measurer is made up of resistance and neon lamp now, can only qualitatively judge energized conductor, can not the quantitative measurement voltage swing.For insulated conductor and concealed wire within the walls, can't judge live wire and look into breakpoint.The liquid crystal number of invention numbers 8620356 shows electricity measurer, only can qualitative segmentation show 24V, 55V, several voltage sections such as 110V, 220V, can not quantitatively segment demonstration, is difficult to satisfy electrician's needs.
The objective of the invention is at 110V commonly used, 220V, quantitative digital shows on the liquid crystal display to being subdivided in every linearity with 10V in the 380V voltage section, and sets up break-make and induction shelves.All element is installed in the one-pen shape shell and carries the test event that can realize that the electrician uses always.
In order to realize this purpose, the solution of the present invention is to adopt the step-down of bi-directional voltage stabilizing device, makes 33% rate of change from 180V to 240V be converted into 700% rate of change of 10V to 70V.Big like this rate of change is easy to drive different liquid crystal display sections by voltage divider.Use different bi-directional voltage stabilizing devices and can realize multirange.Break-make and induction shelves utilize the integrated circuit amplifying signal to realize.
The utility model is realized digital display voltage without battery because without A/D converter, and is simple in structure, uses durablely, and cost is lower, and is easy to implement.Because be designed to multirange, can realize test events such as voltage determination that the electrician uses always, continuity check, purposes is wider.
Concrete structure of the present utility model as shown in Figure 1.(1) is test probe, is Flathead screwdriver shape.(2) be form of a stroke or a combination of strokes shell, made of plastic.(3) communicate with socket (5) for the subtest test pencil.(4) be the multirange LCDs.(6) for responding to the utmost point of holding of test.(7) be the measurement function switch, induction, break-make, voltage third gear are arranged respectively.(8) be the voltage range switch, 110V, 220V, 380V third gear are arranged respectively.(9) the liquid crystal display front shroud of making for transparent material (10) is a conductive rubber, is used for being connected of liquid crystal display and printed panel.(11) be voltage divider, the resistance of series connection commonly used constitutes.(12) be printed circuit board (PCB).(13) be the bi-directional voltage stabilizing element, can serve as with thyrector or zinc oxide varistor.
The course of work of the present invention as shown in Figure 2.After measuring voltage enters from probe (1),, at this moment be the voltage retaining through linking the 7-1 contact through switch (7).Passing through switch (8) again, to enter the 8-2 contact be the 220V shelves, and at this moment the bi-directional voltage stabilizing element stops fully that to exchanging 170V residual 10V enters voltage divider during input 180V, can only drive one section liquid crystal.Residual 70V enters voltage divider when input 240V, can drive seven sections liquid crystal.Change voltage divider and can further be subdivided into 5V interval or littler.Switch (8) connects three kinds of different metrosil elements can realize three kinds of different voltage ranges.The electrical schematic diagram of special circuit (16) as shown in Figure 3.When switch (7) places the 7-2 shelves, be induction test shelves.Induced signal enters the positivity input end that arrives operational amplifier (20) through switch (7) from probe (1).Serial resistance (18) is to prevent that too high voltage from damaging circuit.Generally get 20 megaohms.Feedback resistance (21), (22) electric capacity (23) make operational amplifier (20) only amplify industrial-frequency alternating current, and is very low for the gain amplifier of radio broadcasting and TV signal.Power frequency component is enough to drive inverse gate (24) (25) through after amplifying, and produces the complementary signal of opposite polarity.Electric capacity (26) is partiting dc capacitor, prevents that liquid crystal is subjected to DC voltage and damages.The liquid crystal pole plate is subjected to reverse swing door (24) (25) and drives the back demonstration
Number.The self-sustained oscillation signal that reverse swing door (29) (30) resistance (31) electric capacity (32) produces when switch (7) places the 7-3 shelves is delivered to probe (1) and liquid crystal Off electrode (36) through driving gate (33).The inversion signal that driving gate (34) produces arrives back electrode (38) the demonstration Off of liquid crystal through resistance (35) and electric capacity (19).Back electrode is linked socket (5) again.When being communicated with between probe (1) and the socket (5), electrode (36) and back electrode (38) short circuit.Off does not show.Resistance (35) is gone up the generation pressure drop and is delivered to ON electrode (36), shows that ON special IC (16) can replace with universal circuit MC14573 and CD74HC04 chip.
For the ease of enforcement, the manufacturing process with the multirange electricity measurer is summarized as follows below: earlier each element is installed on the printed panel.Then liquid crystal display (4) and conductive rubber (10) are packed into connect probe in the shell after, connect pressure regulator check 110V, whether 220V voltage correct.If deviation can be changed bi-directional voltage stabilizing element (13), (14) greater than requiring.If it is too big or too little to need a step-up transformer to be connected on the output voltage regulator induction sensitivity during check 380V voltage., can change the value of resistance (21).Transferred the back printed panel to be locked in the shell.
Peace can constitute the present invention according to said method--the multirange electricity measurer.
Claims (3)
1, a kind of multirange electricity measurer is characterized by by test probe (1) shell (2) subtest test pencil (3) numeral demonstration LCDs (4) function switch (7) voltage range switch (8) voltage divider (11) printed circuit board (PCB) (12) bi-directional voltage stabilizing element (13) integrated circuit (16) and forms.
2, electricity measurer according to claim 1 is characterized by with the step-down of bi-directional voltage stabilizing element and drives different liquid crystal display sections by voltage divider again.Use different bi-directional voltage stabilizing devices and can realize multirange.
3, its feature of electricity measurer according to claim 1 is with being that integrated circuit (16) amplifies industrial-frequency alternating current, and it is charged to drive the liquid crystal display demonstration, realizes the induction survey.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93242421 CN2173959Y (en) | 1993-10-22 | 1993-10-22 | Digital indicating multirange electrometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93242421 CN2173959Y (en) | 1993-10-22 | 1993-10-22 | Digital indicating multirange electrometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2173959Y true CN2173959Y (en) | 1994-08-10 |
Family
ID=33816124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93242421 Expired - Fee Related CN2173959Y (en) | 1993-10-22 | 1993-10-22 | Digital indicating multirange electrometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2173959Y (en) |
-
1993
- 1993-10-22 CN CN 93242421 patent/CN2173959Y/en not_active Expired - Fee Related
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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 |