CN2697658Y - High-precision interval type voltage meter - Google Patents
High-precision interval type voltage meter Download PDFInfo
- Publication number
- CN2697658Y CN2697658Y CN 200420041816 CN200420041816U CN2697658Y CN 2697658 Y CN2697658 Y CN 2697658Y CN 200420041816 CN200420041816 CN 200420041816 CN 200420041816 U CN200420041816 U CN 200420041816U CN 2697658 Y CN2697658 Y CN 2697658Y
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- voltage
- meter
- power supply
- amplifier
- instrument amplifier
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Abstract
The utility model relates to a high-precision interval type voltage meter which comprises a power supply and a voltage meter head which is labeled scales. The positive and negative poles of the power supply respectively are connected with the power source input terminal P7 and P4 of a meter amplifier. The inverse input end P2 of the meter amplifier is connected with the reference end of a current-limiting resistor and a voltage reference source which are connected in series. The measured voltage Vin is connected with the positive input end P3 of the meter amplifier through the voltage division end of a voltage divider which is made up by a voltage division resistor and a zero potentiometer which are connected in series. A gain adjustment potentiometer is arranged between the gain adjustment end P1 and P8 of the meter amplifier. The voltage meter head is connected between the output end P6 of the meter amplifier and the negative pole of the power supply. The utility model amplifies one varied interval of the measured voltage through the high input impedance meter amplifier. Meanwhile, the input impedance of the voltage meter is enhanced because of adopting the meter amplifier, the measuring error is decreased, and the measuring precision and distinguishability are enhanced. The internal resistance of the voltage meter also is raised substantially and the error in reading is decreased.
Description
Technical field
The utility model relates to a kind of electrical measurement instrument, particularly adopts the interval formula voltage table of a kind of high precision of interval formula measuring principle.
Background technology
The voltage table of pointer gauge outfit commonly used is a kind of gamut voltage table at present, and it measures initial value all is that stop value is some integers from zero volt, for example, and 0～5V, 0～300V etc.Tested voltage changes in a big way, this table was very not suitable when measuring accuracy was high.But, sometimes tested voltage changes in more among a small circle at one, only account for the very little part of the whole range of gauge outfit, when simultaneously higher measuring accuracy being arranged again, D.C. regulated power supply for example, be difficult to reflect the subtle change of voltage with common pointer gauge outfit, because of resolution does not reach requirement, measuring accuracy is very low.In addition, the internal resistance of this table is low, can produce bigger error when measuring the signal source of high internal resistance.The method that interval formula is measured is used very wide, be different from the whole process measurement of starting from scratch and finishing commonly used to some round valuess, interval formula is measured and is got an interval as required, for example, thermometer can be 0～100 ℃ from zero initial omnidistance measurement range, and be used for the thermometer of take temperature is an interval of 35～42 ℃, and resolution reaches 0.1 ℃.Clearly, can (expanded scale scope) greatly improve resolution and precision effectively with this measuring method.The utility model adopts the components and parts design electronic circuit of high precision, high stability based on above-mentioned interval formula basic principle of measurement, becomes the interval formula voltage table of a kind of high precision, has solved the low problem of gamut voltage table measuring accuracy.
Summary of the invention
The purpose of this utility model is to provide a kind of resolution height, the precision height, and cost is low, and the interval formula voltage table of high precision easy to use can be widely used in the measurement of direct current or ac electric.
For achieving the above object, the technical solution adopted in the utility model is: comprise power supply and the voltmeter head that indicates the respective bins meter full scale, be characterized in, power supply just, negative pole respectively with the power input P7 of instrument amplifier, P4 links, the reverse input end P2 of instrument amplifier links with the current-limiting resistance of connecting mutually and the reference edge of voltage-reference, divider resistance and the branch pressure side of the zero potentiometer voltage divider that constitute and the positive input P3 of instrument amplifier of tested voltage Vin by mutual series connection links, the gain adjustment end P1 of instrument amplifier, be connected with gain between the P8 and adjust potentiometer, also be connected with voltmeter head between the output terminal P6 of instrument amplifier and the negative pole of power supply.
Another characteristics of the present utility model are: voltmeter head indicates the scale of selected interval range.
The interval that the instrument amplifier of the utility model by high input impedance changes to tested voltage is carried out high power and is amplified, broadening meter full scale, simultaneously, the input impedance of adopting instrument amplifier to improve voltage table, reach more than hundreds of K Ω, (also) reduced measuring error, promptly improved resolution and measuring accuracy, and increased substantially the internal resistance of voltage table, reduced reading error and measuring error.
Description of drawings
Accompanying drawing is an electrical block diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing structural principle of the present utility model and principle of work are described in further detail.
Referring to accompanying drawing, the utility model comprises D.C. regulated power supply 1, instrument amplifier 6, voltage-reference 5, indicates voltmeter head 8, zero potentiometer 3, divider resistance 2, gain adjustment potentiometer 7, current-limiting resistance 4 formations of selecting the interval range scale.D.C. regulated power supply 1 is the working power of voltage table; The positive and negative electrode of power supply 1 links with power input P7, the P4 of instrument amplifier 6 respectively, and the reverse input end P2 of instrument amplifier 6 connects voltage-reference 5, and current-limiting resistance 4 provides power supply for it; The positive input P3 of instrument amplifier 6 inserts the voltage divider dividing potential drop measured signal that is made of divider resistance 2, zero potentiometer 3, and zero potentiometer 3 is adjusted the initial value of interval voltage table, also is the zero-bit of voltmeter head 8; The gain adjustment of instrument amplifier 6 is held and is connected to gain adjustment potentiometer 7 between this P1, the P8, is used for adjusting the stop value of interval voltage table, also is the full scale of voltmeter head 8.Like this, choose the interval that tested voltage changes, the high power of the instrument amplifier by high input impedance is amplified, and the variation of the tested voltage of less variation just is reflected on the gamut of the voltmeter head 8 that indicates initial value and stop value, broadening meter full scale, simultaneously, increase substantially the input impedance of voltage table, reached more than hundreds of K Ω, reduced the measuring error of bringing because of load, greatly improve resolution and precision, reached design object.
The utility model is the interval formula instrument of a kind of high precision that has adopted interval formula measuring method design, choose the interval that tested voltage changes, pass through related circuit, broadening meter full scale, improve resolution and measuring accuracy, and increased substantially the internal resistance of voltage table, reduced reading error and measuring error, have resolution height, precision height, cost is low, making is easy, advantage such as easy to use, can be widely used in voltage detecting, measure automatically, field such as control automatically.
Be made into the high-accuracy voltage table of 5V ± 0.1V D.C. regulated power supply with the utility model, between the measurement zone of voltmeter head 8 4.8V～5.2V, gamut is divided into 100 little lattice, every little lattice resolution is 0.004V, originally the voltage table resolution of 0～10V scope is 0.1V, 25 times have been improved, for reflecting that the subtle change of 5V ± 0.1V can be perfectly clear.
Claims (2)
1, the interval formula voltage table of a kind of high precision, comprise power supply [1] and indicate the voltmeter head [8] of scale, it is characterized in that: power supply [1] just, negative pole respectively with the power input P7 of instrument amplifier [6], P4 links, the reverse input end P2 of instrument amplifier [6] links with the current-limiting resistance [4] of connecting mutually and the reference edge of voltage-reference [5], tested voltage Vin links by the branch pressure side of the voltage divider of mutual divider resistance [2] of connecting and zero potentiometer [3] formation and the positive input P3 of instrument amplifier [6], the gain adjustment end P1 of instrument amplifier [6], be connected with gain between the P8 and adjust potentiometer [7], also be connected with voltmeter head [8] between the negative pole of the output terminal P6 of instrument amplifier [6] and power supply [1].
2, the interval formula voltage table of high precision according to claim 1, it is characterized in that: said voltmeter head [8] indicates the scale of selected scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420041816 CN2697658Y (en) | 2004-04-22 | 2004-04-22 | High-precision interval type voltage meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420041816 CN2697658Y (en) | 2004-04-22 | 2004-04-22 | High-precision interval type voltage meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2697658Y true CN2697658Y (en) | 2005-05-04 |
Family
ID=34774669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420041816 Expired - Fee Related CN2697658Y (en) | 2004-04-22 | 2004-04-22 | High-precision interval type voltage meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2697658Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944717A (en) * | 2012-11-14 | 2013-02-27 | 江苏惠通集团有限责任公司 | Voltage detection device and method |
| CN103852614A (en) * | 2012-11-29 | 2014-06-11 | 山东电力集团公司济宁供电公司 | Circuit for detecting leakage current of busbar |
-
2004
- 2004-04-22 CN CN 200420041816 patent/CN2697658Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944717A (en) * | 2012-11-14 | 2013-02-27 | 江苏惠通集团有限责任公司 | Voltage detection device and method |
| WO2014075361A1 (en) * | 2012-11-14 | 2014-05-22 | 江苏惠通集团有限责任公司 | Voltage detection apparatus and method |
| CN103852614A (en) * | 2012-11-29 | 2014-06-11 | 山东电力集团公司济宁供电公司 | Circuit for detecting leakage current of busbar |
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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 |