CN1012758B - High frequency inducdtance and capacitance measuring instrument - Google Patents
High frequency inducdtance and capacitance measuring instrumentInfo
- Publication number
- CN1012758B CN1012758B CN 86102187 CN86102187A CN1012758B CN 1012758 B CN1012758 B CN 1012758B CN 86102187 CN86102187 CN 86102187 CN 86102187 A CN86102187 A CN 86102187A CN 1012758 B CN1012758 B CN 1012758B
- Authority
- CN
- China
- Prior art keywords
- oscillator
- frequency
- inductance
- measuring
- capacitance
- 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
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention discloses a novel measuring device of high frequency inductance and capacitance, which is composed of an oscillator, a frequency measurement circuit and a computer. The present invention is characterized in that measured inductance or measured capacitance is coupled in a resonant loop of the oscillator; a value of the measured inductance or the measured capacitance is obtained through measuring the frequency of the oscillator. The precision of measuring inductance is superior to 0.5%(+/-)50 muH, and the range of measuring inductance is from 0.001 mH to 100 mH; the precision of measuring capacitance is superior to 0.2%, and the range of measuring capacitance is from 1PF to 10000PF. The present invention has the advantages of direct digital display of measuring value and simple and convenient operation. The present invention is widely suitable for industries of earthquake, post telephone and telegraph, broadcasting television, electron, metering, etc.
Description
The present invention relates to a kind of surveying instrument of high-frequency inductance capacitor, belong to the electric variable measurement technical field.
At present, the instrument that high-frequency inductor, electric capacity are measured by China only has " LCCG-1 high frequency inducdtance and capacitance measuring instrument ", adopts the vibration beat principle, listens beat sound during measurement, sees the meter pointer indication, reads the value that scale value is determined tested inductance or electric capacity.This instrument was succeeded in developing in the Soviet Union in 1949, and nineteen fifty-five is introduced China.Even to this day feel obviously that measurement range is little, measuring accuracy low (precision 1.5%), big because of adopting electron tube, volume, heaviness is measured trouble.
In order to enlarge measurement range to inductance, improve measuring accuracy, advise among the Russian Patent instructions SU661418, form an oscillating dipole with inductance to be measured, the resonance potential of high-frequency signal on dipole that produce of measurement standard high frequency oscillator then, thus extrapolate the inductance value of inductance to be measured.
Task of the present invention provides a kind of new test philosophy and device, enlarges the measurement range to electric capacity, improves inductance simultaneously also to the measuring accuracy of electric capacity with make easy and simple to handle.
Task of the present invention is finished as follows: after detected element-inductance L or capacitor C inserted instrument internal oscillator resonant tank, measured L or C formed the vibration resonant tank with the appropriate section of instrument.The r that this oscillator produces is after amplifying shaping, and the square-wave signal of formation rule is measured by frequency measurement circuit.According to the vibration resonance theory:
Derive this and measure used computing formula
L is tested=1/ (f
2) K
1-K
2(1 ')
C is tested=1/ (f
2) K
11-K
12(2 ')
Wherein
K
1=1/ (4 π
2In the C)
K
2In=the L
K
11=1/ (4 π
2In the L)
K
' 12In=the C
Definite method of K value is to go into oscillator with standard inductance L mark and standard capacitance C tag splice, measures its respective frequencies, solves in order to following system of equations then:
In formula (1 '), in (2 ') under the known condition of each K value, using formula (1 '), (2 ') can be by the mensuration to the high frequency oscillator oscillation frequency that contains tested inductance or electric capacity.Calculate the value of tested inductance or electric capacity.The error of this value from formula (1 '), (2 ') be as can be seen f value and K value error institute extremely.Its source mainly contains the oscillator frequency fluctuating error, frequency tester frequency measurement error, four aspects of error that L marks, C mark sum of errors is ignored the transistor input, the output capacitance frequency characteristic causes.After taking appropriate measures in force, can make the value that calculates by formula (1 '), (2 ').Reach the inductance precision and be better than 0.5% ± 50m μ H, scope 10
-3MH-10
2MH, the electric capacity precision is better than 0.2%, scope 1PF-10
4PF.
For making measuring operation easy, oscillation frequency promptly is sent to computing machine once measuring, and finishes the calculating of formula (1 '), (2 ') by computing machine, and result of calculation is delivered to display panel through the digital display interface circuit and shown.
Measuring principle advanced person of the present invention, the big (inductance 10 of measurement range
-3MH-10
2MH, electric capacity 1PF-10
4PF), measuring accuracy height (inductance is better than 0.5% ± 50m μ H, electric capacity 0.2%), easy and simple to handle, volume is little, and is in light weight, can be widely used in earthquake, post and telecommunications, radio and television in the industries such as electronics, metering, are used as inductance measuring and electric capacity.
Accompanying drawing one is a HLCP type high-frequency inductance capacitor precision measuring instrument functional-block diagram
Accompanying drawing two is measuring head oscillator circuit structure figure
Accompanying drawing three is measuring head circuit diagram HLCP-1
Accompanying drawing four is crystal oscillator frequency division and frequency measurement control structure figure HLCP-2
Accompanying drawing five is frequency measuring count-er and computing machine input interface A circuit diagram HLCH-3
Accompanying drawing six is measurement range selection key circuit figure HLCH-10
Below with reference to accompanying drawing invention is described in further detail.
Referring to accompanying drawing two, the oscillator of instrument is the parallel connection type capacitance connecting three point type oscillator, during inductance measuring, as figure a structure, when measuring electric capacity, as figure b structure.Behind element being measured-inductance or electric capacity place in circuit, press corresponding range key, then the same C of element being measured
1, C
2, C
3With composition vibration resonant tank in the L.
L is tested=1/ (f
2) 1/ (4 π
2In the C)-L in
C is tested=1/ (f
2) 1/ (4 π
2In the C)-C in
(in the C)=1/ (C wherein 1/
1+ C
Oe)+1/ (C
2+ C
Ie)+1/ (C
3)
Transistor input and output capacitor C
IeAnd C
OeBe the function of frequency, change, in order to help improving the measuring accuracy of measured element, guaranteeing under the reliable situation of vibration, allow C as far as possible along with oscillation frequency
1, C
2Be far longer than C
3, C
3Be far longer than C
Ie, C
OeBecause C
1, C
2＞＞C
3＞＞C
Ie, C
Oe, then can be with C
IeAnd C
OeIgnore, allow
1/ (in the C)=1/ (C
1)+1/ (C
2)+1/ (C
3)
Referring to accompanying drawing three, T
1Be oscillator transistor, T
2-T
8Form amplification and rectification circuit.Field effect transistor T
2Form an emitter follower, have high input impedance and low output impedance, very little to the oscillator influence of prime, strengthened output loading capability simultaneously.T
2Emitter output is added to T
3Base stage, formed a common-emitter amplifier by them, the load of this amplifier is T
4, T
4Be connected into the common base circuit.This electric circuit characteristic is both to have had high amplifying power, has frequency characteristic preferably again.Oscillator signal is through T
2-T
6Will be after the amplification greater than 6V
PP, (50mH, 100mH second gear oscillator signal are earlier through T for the signal through having amplified
7-T
8The shaping circuit of forming) is sent to the frequency measurement circuit that HLCP-2, HLCP-3 form.
Referring to accompanying drawing four, Y
9A, Y
9B, Y
9C, Y
9DAnd Y
7BThe main gate of forming frequency tester, the characteristics of this circuit are that tested square-wave signal could pass through Y after pressing the measurement key
9D, otherwise can only pass through Y
9A, when measured pulse by and do not pass through Y fully
7BThe time signal strobe disappear, measured pulse still can completely be passed through.This is of great benefit to improving this Instrument measuring precision.Crystal oscillator and Y
1-Y
13Form the crystal oscillator frequency dividing circuit, become the clock T signal generator of this instrument.10mS, 0.1S and 1S signal offer the Y of frequency measurement circuit according to the needs of measuring
8A, as gate time.0.1S signal is also delivered to HLCP-8 and is used as the computer clock pulse.After pressing the measurement key, Y
10AObtain the frequency measurement signal, the tested frequency signal of measuring head is promptly from Y
7BBy and be sent to rolling counters forward, signal V after a while
SCPromptly starting computing machine starts working.Referring to accompanying drawing five, counter is made up of 5 C187, and remainder is computer data input interface A.
Referring to accompanying drawing one, this instrument computing machine is by arithmetical unit (HLCP-4), memory (HLCP-9), controller (HLCP-8) and input interface A, B.Output interface (HLCP-5) and data bus are formed.By pressing the signal V that measures key and produce
SCThe start-up control device, then controller sends instruction, takes out the frequency measurement data from HLCP-3 and is sent to the calculating that HLCP-4 finishes 1/ (f2): send instruction by controller again and take out and the corresponding K of range from HLCP-9
1(or K
11) be sent to HLCP-4 and finish 1/ (f
2) K
1(or K
11) calculating; Under controller action, take out and the corresponding K of range more afterwards by HLCP-9
2(or K
12) be sent to HCCP-4 and finish 1/ (f
2) K
1-K
2(or 1/ (f
2) K
11-K
12) calculate; Operation result is sent to the HLCP-5 digital display, is tested inductance or capacitance.Do not shut down, do not press the measurement key again, displayed value will keep stablizing constant.
Claims (1)
- A kind of high frequency inducdtance and capacitance measuring instrument, it is by oscillator, frequency measurement circuit and computing machine are formed, it is characterized in that producing in the oscillator of tested high-frequency signal and contain detected element-inductance or electric capacity, used oscillator is the shunt capacitance bikini oscillator, is guaranteeing under the oscillator vibration reliable conditions, should have C1, C2＞＞C3＞＞Coe, Cie, used frequency measurement circuit have the frequency measurement of providing gate time, degree of stability 1 * 10 -6The gate circuit that the crystal oscillator frequency divider of magnitude and the non-conjunction of 42 input ends are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86102187 CN1012758B (en) | 1986-04-01 | 1986-04-01 | High frequency inducdtance and capacitance measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86102187 CN1012758B (en) | 1986-04-01 | 1986-04-01 | High frequency inducdtance and capacitance measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86102187A CN86102187A (en) | 1987-10-21 |
| CN1012758B true CN1012758B (en) | 1991-06-05 |
Family
ID=4801650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86102187 Expired CN1012758B (en) | 1986-04-01 | 1986-04-01 | High frequency inducdtance and capacitance measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012758B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293390B (en) * | 2013-06-04 | 2016-02-03 | 北京中科新微特科技开发股份有限公司 | A kind of test circuit of power MOSFET device series inductance |
| CN103399189B (en) * | 2013-07-25 | 2016-03-02 | 西华师范大学 | A kind of Multifunction AC circuit parameter testing and characteristic demonstration device |
| CN103439581B (en) * | 2013-08-30 | 2016-06-01 | 昆山奥德鲁自动化技术有限公司 | A kind of metering circuit |
| CN103760424A (en) * | 2014-01-18 | 2014-04-30 | 张新安 | Q instrument capable of measuring large capacitance through series connection comparison method |
| CN104917143A (en) * | 2015-05-27 | 2015-09-16 | 中国石油化工股份有限公司 | Lightning circuit breaker based on high-frequency inductive reactance test |
| CN109813964B (en) * | 2017-11-20 | 2021-11-05 | 辉芒微电子(深圳)股份有限公司 | Capacitance detection circuit and method |
| CN108008202A (en) * | 2017-11-27 | 2018-05-08 | 江苏天瑞仪器股份有限公司 | A kind of measuring method of mass spectrum multi-pole capacitance |
| CN108982972A (en) * | 2018-08-22 | 2018-12-11 | 西安飞芯电子科技有限公司 | A kind of micro- inductance measurement method and apparatus |
-
1986
- 1986-04-01 CN CN 86102187 patent/CN1012758B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN86102187A (en) | 1987-10-21 |
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