CN2112829U - Micro-consumption high-precision digital micro current meter - Google Patents
Micro-consumption high-precision digital micro current meter Download PDFInfo
- Publication number
- CN2112829U CN2112829U CN92213380.8U CN92213380U CN2112829U CN 2112829 U CN2112829 U CN 2112829U CN 92213380 U CN92213380 U CN 92213380U CN 2112829 U CN2112829 U CN 2112829U
- Authority
- CN
- China
- Prior art keywords
- microgalvanometer
- micro
- current meter
- precision
- described 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.)
- Granted
Links
- 238000012216 screening Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000003287 optical effect Effects 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract 1
- 230000004304 visual acuity Effects 0.000 description 4
- 238000005286 illumination Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000005375 photometry Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides a noveldigital micro current meter, which can be powered by 9V layered battery in the market. The working current of the whole micro current meter just is 2 mA. The minimum measurable current is 1PA (10+[-12]A). The measurement precision is 0.1% (+/-) 1 word and the work performance is fairly stable. The utility model has the advantages of convenience for carrying and convenient operation, which can be made into a hand-held high precision micro current meter or a high sensitivity optical measuring gauge.
Description
The utility model is a kind of New Digital microgalvanometer, and its principal feature is that Overall Power Consumption is very little and measuring accuracy is very high.Existing high precision microgalvanometer all needs Alternating Current Power Supply or with rechargeable battery powered, and the stability of sensitive measurement shelves is often not good, the purpose of this utility model is exactly to make a kind of little power consumption high-precision digital microgalvanometer that overcomes above-mentioned shortcoming, adopted unique circuit design and components and parts to select, make instrument complete machine working current only be 2mA, available commercially available 9V laminated battery power supply, it is 1PA(10 that its I is surveyed electric current
-12A), the measuring accuracy height is 0.1% ± 1 word, and the work quite stable, can be made into hand-held high precision microgalvanometer or highly sensitive optical gauge, is easy to carry, and is easy to operate.
Below in conjunction with accompanying drawing in detail its feature structure is described in detail.Instrument panel as shown in Figure 1,1 is liquid crystal measurement result display screen among the figure, 2 is range selector, 3 is power switch, 4 is zero potentiometer, 5 is input jack.
This microgalvanometer current measuring range is 1PA-1.9999mA, is divided into six ranges, and measurement result shows that by 41.2 liquid crystal digitals each range and resolving power thereof are as follows:
The range resolving power
2×10
－3A 10
－7A
2×10
－4A 10
－8A
2×10
－5A 10
－9A（1nA）
2×10
－6A 10
－10A
2×10
－7A 10
－11A
2×10
－8A 10
－12A（1PA）
The detailed circuit of this microgalvanometer as shown in Figure 2.I
1NBe tested current input terminal, tested electric current converts voltage to by the I/V transducer that high input impedance, low consumed power operational amplifier TL061 and six precision resistances constitute, wherein the resistance error of precision resistance be not more than ± 0.1%, temperature coefficient is less than ± 50PPM/C, K1 is a range switch.0～200mv voltage of I/V transducer output is delivered to the input end of GM045 type digitizing tablet voltage table, and the core parts of this table are not draw among 41/2 A/D converter ICL7129(of a slice figure), the range of panel table is 0-200mv, resolving power is 10 μ V.Therefore the resolving power that can calculate the sensitiveest shelves of this microgalvanometer is:
(10V)/(10MΩ) ＝ (10×10
－6V)/(10×10
6Ω) ＝10
－12A＝1PA
For realizing high precision, the measurement of high stable, operational amplifier needs just stable by voltage, the negative supply power supply, to such an extent as to then will increase Overall Power Consumption with general mu balanced circuit can not power with laminated battery, for solving this contradiction, the positive supply of this instrument take from ICL7129 simulation ground and+3V voltage between the 9V, this power supply does not change with cell voltage, the required negative voltage of operational amplifier then thus+3V produces through power converting circuit ICL7660 and obtains, adopt this power supply plan to make the power consumption of mu balanced circuit reduce to minimum, thereby make the complete machine working current be not more than 2mA.When supply voltage was lower than 7.2V, LCDs can provide low-voltage indication LOWBATT, reminds the user to change battery, and this instrument also has the outrange deixis in addition.Instrument should adopt the shell of good electrostatic screening, and will shield connection circuit ground reliably, to guarantee instrument stabilizer work.
This microgalvanometer can be applicable to various occasions, as makes various highly sensitive optical gauges.Telescopic nitometer measuring head mixed by this microgalvanometer and after brightness was demarcated, can survey minimum brightness was 0.01cdm
2Mix the illumination photometry head and after corresponding demarcation, can survey minimal illumination is 0.01lx; Mix light power meter probe and after corresponding demarcation, can survey minimum optical power is 10
-11Mw.
Claims (5)
1, a kind of high-precision digital microgalvanometer of little power consumption, form by I/V transducer, negative voltage generator, digitizing tablet voltage table and 9V laminated battery, it is characterized in that the I/V transducer by operational amplifier TL061 and resistance error be not more than ± 0.1%, temperature coefficient constitutes less than the precision resistance of ± 50PPM/C.
2,, it is characterized in that A-D converter wherein is made of ICL7129 by the described digital microgalvanometer of claim 1.
3,, it is characterized in that negative voltage generator wherein constitutes by 7660 by the described digital microgalvanometer of claim 1.
4, by the described digital microgalvanometer of claim 1, the positive supply that it is characterized in that operational amplifier wherein by the simulation ground of ICL7129 and+3V voltage between the 9V power supply supplies with.
5, by the described digital microgalvanometer of claim 1, it is characterized in that having good electrostatic screening shell, and reliable ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92213380.8U CN2112829U (en) | 1992-03-12 | 1992-03-12 | Micro-consumption high-precision digital micro current meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92213380.8U CN2112829U (en) | 1992-03-12 | 1992-03-12 | Micro-consumption high-precision digital micro current meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2112829U true CN2112829U (en) | 1992-08-12 |
Family
ID=4958113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92213380.8U Granted CN2112829U (en) | 1992-03-12 | 1992-03-12 | Micro-consumption high-precision digital micro current meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2112829U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520238A (en) * | 2011-12-23 | 2012-06-27 | 西交利物浦大学 | Intelligent programmable-control microcurrent measurement display system |
| CN104393881A (en) * | 2014-12-08 | 2015-03-04 | 成都中远信电子科技有限公司 | Portable high-efficiency signal acqusition and processing board device |
-
1992
- 1992-03-12 CN CN92213380.8U patent/CN2112829U/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520238A (en) * | 2011-12-23 | 2012-06-27 | 西交利物浦大学 | Intelligent programmable-control microcurrent measurement display system |
| CN104393881A (en) * | 2014-12-08 | 2015-03-04 | 成都中远信电子科技有限公司 | Portable high-efficiency signal acqusition and processing board device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |