CN101701977A - Single-ended electrical signal measuring instrument - Google Patents
Single-ended electrical signal measuring instrument Download PDFInfo
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- CN101701977A CN101701977A CN200910221094A CN200910221094A CN101701977A CN 101701977 A CN101701977 A CN 101701977A CN 200910221094 A CN200910221094 A CN 200910221094A CN 200910221094 A CN200910221094 A CN 200910221094A CN 101701977 A CN101701977 A CN 101701977A
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- operational amplifier
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- measuring instrument
- signal measuring
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Abstract
The invention relates to a single-ended electrical signal measuring instrument relating to electrical signal measurement. The single-ended electrical signal measuring instrument comprises an operational amplifier, a divider resistor, a feedback resistor, a voltage generation resistor, a battery and a shielding box, wherein both ends of the voltage generation resistor are respectively connected with a reference zero and the positive-phase input end of the operational amplifier; both ends of the divider resistor are respectively connected with the reference zero and the reverse-phase end of the operational amplifier; both ends of the feedback resistor are respectively connected with the output end and the reverse-phase end of the operational amplifier; the battery is connected between the power supply end of the operational amplifier and the reference zero; a circuit is placed into the shielding box; and the positive-phase input end and the output end of the operational amplifier are respectively the input end and the output end of the single-ended electrical signal measuring instrument. The noise of a ground wire is measured by adopting a single-ended method, and the invention can directly measure the potential float of an appointed ground wire without an assistant ground wire, thereby making up the limitation that the traditional double-ended measurement can not show which ground wire generates the noise.
Description
Technical field
The invention belongs to the electric signal measurement field, particularly single-ended electrical signal measuring instrument.
Background technology
A lot of accurate, important scientific experiment is to be to carry out electronics measurement with reference to zero potential with the ground wire current potential, but current potential instability on the ground wire, noise is arranged, can be to the different earth points of circuit, perhaps the different circuit branch of same earth point produce unpredictalbe disturbance or influence, because the reference potential noise has different propagation delays or gain in different circuit branch.So, must accurately measure its size to this class suspension noise (non-electric potential difference type floating potential fluctuation or electric charge fluctuation) of reference potential itself and just can make correct strick precaution, obtain accurate scientific measurement.
But the current potential that the technology of also not finding up to now, comparative maturity is measured on the ground wire floats.Described according in August, the 2003 international electromagnetic compatibility symposial of IEEE (2003IEEE International Symposium on Electromagnetic Compatibility) volume one 242-247 page or leaf, measurement to ground connection electric noise in the circuit board is by the voltage difference between two probe measurement two earth points, weigh the ground wire noise level, but this method can only measure electric potential difference between two earth points, can not embody floating of electromotive force on the single ground wire, for example: on may two earth points very strong public noise signal (common-mode signal) be arranged, in measurement, just can not embody, this measurement has very big error, can not conclude noise is from which place in two earth points.
Summary of the invention
The objective of the invention is in order to overcome the defective of above-mentioned double-end signal or noise-measuring, a kind of single-ended electrical signal measuring instrument that can measure single-ended signal or noise is provided.
Technical scheme of the present invention:
Single-ended electrical signal measuring instrument of the present invention, comprise operational amplifier OPA, divider resistance R and feedback resistance Rf, also comprise living piezoresistance Rv, battery BAT and shielding box SBOX, the two ends of giving birth to piezoresistance Rv connect the normal phase input end of reference zero RZERO and operational amplifier OPA respectively, the two ends of divider resistance R connect the inverting input with reference to zero RZERO and operational amplifier OPA respectively, the two ends of feedback resistance Rf connect output terminal and the inverting input of operational amplifier OPA respectively, battery BAT is connected between the power supply port and reference zero RZERO of operational amplifier OPA, entire circuit is placed on SBOX in the shielding box, the normal phase input end of operational amplifier 0PA is the input end of described single-ended electrical signal measuring instrument, and the output of operational amplifier OPA constitutes the output of described single-ended electrical signal measuring instrument.
Described reference zero RZERO links to each other with shielding box SBOX inwall.
It is in parallel with living piezoresistance Rv to set up shunt capacitance C1.
It is in parallel with feedback resistance Rf to set up feedback capacity C2.
The principle of work of single-ended electrical signal measuring instrument of the present invention is: we will measure the fluctuation of the electromotive force of single-point, rather than the fluctuating of electric potential difference (voltage), can be regarded as the fluctuation of measuring electric charge, we are connected on input end on the noise source, the current potential of measurement point unsteady (electric charge fluctuation) can cause the input end charge variation, the frequency and the amplitude that change all are directly proportional with the frequency and the amplitude of noise source, the charge signal of this alternation is by giving birth to the voltage signal that just can produce an alternation behind the piezoresistance Rv, pass through again by operational amplifier, the non-inverting amplifier (non-inverting amplifier) that divider resistance R and feedback resistance Rf constitute amplifies this voltage signal, and this signal can directly reflect the power of noise source potential change.Owing to will measure the ground wire noise, ground wire just can not be as reference zero of the present invention, and it is reference zero that circuit of the present invention is selected battery or shielding box.Circuit is placed on the electromagnetic interference (EMI) that can prevent the external world in the shielding box, and the reference potential of circuit is also very stable simultaneously.
Single-ended electrical signal measuring instrument of the present invention can be connected in parallel on the Rv two ends with a capacitor C 1, to play the effect of delay and filtering, measures the intensity that responds thereby regulate.
Single-ended electrical signal measuring instrument of the present invention produces self-oscillation in the course of the work in order to prevent operational amplifier, and the bandwidth of limiting amplifier can be in parallel with resistance R _ f with a capacitor C 2.
When the present invention uses, input end should be linked to each other with noise source with lead, and can not use shielding line, if with shielding line so the reference point of measuring system can be subjected to the interference of noise source, oscillograph should be used direct supply, output terminal usefulness shielding line links to each other with oscillograph.During measurement, saturated for preventing to measure, operational amplifier should be selected different voltage amplification factors for use according to the power of different noise sources, and the living piezoresistance Rv that input end produces pressure drop also can do suitable adjustment, the strong more operational amplifier enlargement factor that should make of noise signal diminishes, and vice versa.Also can do suitable conversion with the shunt capacitance C1 that gives birth to piezoresistance Rv parallel connection with the feedback capacity C2 of feedback resistance Rf and joint defence self-excitation according to signal source frequency different.
Input termination one lead of single-ended electrical signal measuring instrument of the present invention being stretched in the air (being equivalent to stretch an antenna aloft) and can measure the suspension electromagnetic signal (over the ground non-) in the atmosphere, the results are shown in accompanying drawing 4, as seen, mainly is the electrical interference of 50Hz city.Should measure in immigration (together with the described antenna) screened room and carry out, it the results are shown in accompanying drawing 5, does not see the electrical interference of 50Hz city, and this expection with us is identical, because the conductively-closed of 50Hz civil power undesired signal.Receive the noise signal that to measure on the ground wire on the single ground wire with the input end of single-ended electrical signal measuring instrument of the present invention.Like this, we have just measured the noise signal of single ground wire first, the results are shown in accompanying drawing 6, mainly are the electrical interference of 50Hz city, and the waveform that this and his human double earth wire measurement differential signal obtain is in full accord.
The advantage of this measuring instrument is:
(1) the present invention adopts single-ended method that the ground wire noise is measured, and does not need auxiliary ground wire just can directly measure to specify the unsteady of current potential on the ground wire, has remedied traditional double-end measurement and can not provide noise on earth from the limitation of which ground wire.
(2), avoided the difference measurement of traditional double ground wire may give the drawback of the conclusion that makes mistake (measurement provides low noise when all very high but waveform similarity of each ground wire noise) owing to be single-ended measurement.
(3) measure cost and reduce greatly, because extra cost and outdoor construction expense that not auxiliary ground wire brings.
Description of drawings
Fig. 1 is the basic circuit diagram of single-ended electrical signal measuring instrument of the present invention.
Fig. 2 is a circuit diagram of setting up the single-ended electrical signal measuring instrument of the present invention of shunt capacitance.
Fig. 3 is a circuit diagram of setting up the single-ended electrical signal measuring instrument of the present invention of shunt capacitance and feedback capacity.
Fig. 4 is that input termination one lead with single-ended electrical signal measuring instrument of the present invention stretches into the suspension electromagnetic signal in the atmosphere that (is equivalent to antenna) in the air and measures.
Fig. 5 moves into the result who measures in the screened room to the measurement of Fig. 4.
Fig. 6 receives the noise signal that measures on the single ground wire with the input end of single-ended electrical signal measuring instrument of the present invention.
Number in the figure: the Vin input signal, the Vout output signal, Rv gives birth to piezoresistance, R divider resistance, Rf feedback resistance, OPA
Operational amplifier, BAT battery, SBOX shielding box, C1 shunt capacitance, C2 feedback capacity, RZERO reference zero.
Embodiment
Embodiment 1: the basic model single-ended electrical signal measuring instrument
Fig. 1 is the circuit diagram of basic model single-ended electrical signal measuring instrument of the present invention, comprise operational amplifier, divider resistance R and feedback resistance Rf, also comprise living piezoresistance Rv, battery and shielding box, the two ends of giving birth to piezoresistance Rv connect the normal phase input end of reference zero RZERO and operational amplifier respectively, the two ends of divider resistance R connect the inverting input with reference to zero RZERO and operational amplifier respectively, the two ends of feedback resistance Rf connect the output terminal and the inverting input of operational amplifier respectively, battery is connected between the power supply port and reference zero RZERO of operational amplifier, entire circuit is placed in the shielding box, the normal phase input end of operational amplifier is the input end of described single-ended electrical signal measuring instrument, and the output of operational amplifier constitutes the output of described single-ended electrical signal measuring instrument.
The principle of work of present embodiment: the fluctuation of the electromotive force of single-point, can regard the fluctuation of electric charge as, the current potential of measurement point unsteady (electric charge fluctuation) can cause the input end charge variation, the frequency and the amplitude that change all are directly proportional with the frequency and the amplitude of noise source, the electric signal of this alternation is by giving birth to the voltage signal that just can produce an alternation behind the piezoresistance Rv, by in-phase amplifier this voltage signal is amplified, this signal can directly react the power of noise source potential change again.Owing to will measure the noise of ground wire, ground wire just can not be as reference zero of the present invention, and it is reference zero that circuit of the present invention is selected battery or shielding box.Circuit is placed on the electromagnetic interference (EMI) that can prevent the external world in the shielding box, and the reference potential of circuit is also very stable simultaneously.
Embodiment 2: the single-ended electrical signal measuring instrument of setting up shunt capacitance
As shown in Figure 2, give birth to of the delay of the single-ended signal of shunt capacitance C1 scalable input in parallel on the piezoresistance Rv at input end, that is, regulate the voltage of giving birth on the piezoresistance Rv, thereby regulate output voltage at living piezoresistance Rv two ends.
Embodiment 3: the single-ended electrical signal measuring instrument of setting up feedback capacity
As shown in Figure 3, in work self-oscillation appears in order to prevent in-phase amplifier, and the bandwidth of limiting amplifier, can a feedback capacity C2 is in parallel with feedback resistance Rf.
Claims (4)
1. single-ended electrical signal measuring instrument, comprise operational amplifier OPA, divider resistance R and feedback resistance Rf, it is characterized in that also comprising living piezoresistance Rv, battery BAT and shielding box SBOX, the two ends of giving birth to piezoresistance Rv connect the normal phase input end of reference zero RZERO and operational amplifier OPA respectively, the two ends of divider resistance R connect the inverting input with reference to zero RZERO and operational amplifier OPA respectively, the two ends of feedback resistance Rf connect output terminal and the inverting input of operational amplifier OPA respectively, battery BAT is connected between the power supply port and reference zero RZERO of operational amplifier OPA, entire circuit is placed among the shielding box SBOX, the normal phase input end of operational amplifier OPA is the input end of described single-ended electrical signal measuring instrument, and the output of operational amplifier OPA constitutes the output of described single-ended electrical signal measuring instrument.
2. single-ended electrical signal measuring instrument according to claim 1 is characterized in that described reference zero RZERO links to each other with shielding box SBOX inwall.
3. single-ended electrical signal measuring instrument according to claim 1, it is in parallel with living piezoresistance Rv to it is characterized in that setting up shunt capacitance C1.
4. single-ended electrical signal measuring instrument according to claim 1, it is in parallel with feedback resistance Rf to it is characterized in that setting up feedback capacity C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102210944A CN101701977B (en) | 2009-06-02 | 2009-11-05 | Single-ended electrical signal measuring instrument |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910117002.8 | 2009-06-02 | ||
| CN200910117002 | 2009-06-02 | ||
| CN2009102210944A CN101701977B (en) | 2009-06-02 | 2009-11-05 | Single-ended electrical signal measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101701977A true CN101701977A (en) | 2010-05-05 |
| CN101701977B CN101701977B (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102210944A Expired - Fee Related CN101701977B (en) | 2009-06-02 | 2009-11-05 | Single-ended electrical signal measuring instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441592A (en) * | 2019-09-17 | 2019-11-12 | 贵州电网有限责任公司 | A kind of the sampling early warning system and method for GIS electronic mutual inductor acquisition unit |
-
2009
- 2009-11-05 CN CN2009102210944A patent/CN101701977B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441592A (en) * | 2019-09-17 | 2019-11-12 | 贵州电网有限责任公司 | A kind of the sampling early warning system and method for GIS electronic mutual inductor acquisition unit |
| CN110441592B (en) * | 2019-09-17 | 2024-05-07 | 贵州电网有限责任公司 | Sampling early warning system and method of electronic transformer acquisition unit for GIS |
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| Publication number | Publication date |
|---|---|
| CN101701977B (en) | 2011-09-07 |
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