JPS57113372A - Measuring system of electrostatic capacity of capacitive element - Google Patents
Measuring system of electrostatic capacity of capacitive elementInfo
- Publication number
- JPS57113372A JPS57113372A JP20681A JP20681A JPS57113372A JP S57113372 A JPS57113372 A JP S57113372A JP 20681 A JP20681 A JP 20681A JP 20681 A JP20681 A JP 20681A JP S57113372 A JPS57113372 A JP S57113372A
- Authority
- JP
- Japan
- Prior art keywords
- output
- amplifier
- multiplier
- supplied
- multiplied
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
PURPOSE:To increase resolving capacity and also to shorten length of the of measurement, by controlling the gain of a system, in which a multiplied output of a detecting signal and a reference signal is obtained, and a gain of a system, in which a squared output of the reference signal is obtained, in accordance with a value of the multiplied output. CONSTITUTION:Voltages at the both ends of a capactive element 2, which is connected to a reference AC power source 1 and being measured, are supplied to a multiplier 7 through an operating amplifier 5. And, voltages at the both ends of a resistance 3 are supplied to the multiplier 7 through a polarity inverting amplifer 8 and a 90 degree phase shifting circuit 12, and a multiplied output e4 is supplied to a reference voltage input teminal 17a of a digital voltmeter 16 through a low-pass filter 13 and an operation amplifier 15. On the other hand, an output of the amplifier 8 is given to a multiplier 18, a squared output e5 is given to an unknown voltage input terminal 17b of the voltemeter 16 through a low-pass filter 20 and an operation amplifier 22, and a capacity Cx of the capactive element 2 is indicated on the voltmeter 16. And, an output e1 of the amplifier 5 is compared with a voltage value of a power source 37 by a comparator 38, switch circuits 34 and 42 are controlled by a comparative output, and gains of the amplifiers 5 and 22 are controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20681A JPS57113372A (en) | 1981-01-01 | 1981-01-01 | Measuring system of electrostatic capacity of capacitive element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20681A JPS57113372A (en) | 1981-01-01 | 1981-01-01 | Measuring system of electrostatic capacity of capacitive element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57113372A true JPS57113372A (en) | 1982-07-14 |
| JPH0143271B2 JPH0143271B2 (en) | 1989-09-19 |
Family
ID=11467492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20681A Granted JPS57113372A (en) | 1981-01-01 | 1981-01-01 | Measuring system of electrostatic capacity of capacitive element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57113372A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141772U (en) * | 1989-04-28 | 1990-11-29 |
-
1981
- 1981-01-01 JP JP20681A patent/JPS57113372A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0143271B2 (en) | 1989-09-19 |
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