JPS5677761A - Frequency measuring device - Google Patents
Frequency measuring deviceInfo
- Publication number
- JPS5677761A JPS5677761A JP15655379A JP15655379A JPS5677761A JP S5677761 A JPS5677761 A JP S5677761A JP 15655379 A JP15655379 A JP 15655379A JP 15655379 A JP15655379 A JP 15655379A JP S5677761 A JPS5677761 A JP S5677761A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- local oscillation
- addition
- converting
- 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.)
- Pending
Links
Landscapes
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
PURPOSE: To reduce the error which is caused by the frequency tracking circuit, by carrying out an addition or substraction between the measured value after converting the measurement frequency into a low frequency and the measured value of the local oscillation frequency inside the frequency converting circuit.
CONSTITUTION: A conversion is given to the output frequency of the frequency memory circuit 2 with the frequency of the inside local oscillator and through the frequency converting circuit 21. The intermediate-frequency signal obtained by the conversion is supplied to the frequency tracking circuit 3 via the 1st output terminal 21a. At the same time, the local oscillation signal is supplied to the frequency addition measuring circuit 22 via the 2nd output terminal 21b. The circuit 22 carries out an addition of the output frequency of the circuit 3 to the local oscillation frequency of the circuit 21 to give a measurement and display. In such constitution, the signal of the intermediate frequency lower than the fundamental frequency is applied to the circuit 3, thus reducing the error which is caused at the circuit 3.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15655379A JPS5677761A (en) | 1979-11-29 | 1979-11-29 | Frequency measuring device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15655379A JPS5677761A (en) | 1979-11-29 | 1979-11-29 | Frequency measuring device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5677761A true JPS5677761A (en) | 1981-06-26 |
Family
ID=15630305
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15655379A Pending JPS5677761A (en) | 1979-11-29 | 1979-11-29 | Frequency measuring device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5677761A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105467207A (en) * | 2016-01-19 | 2016-04-06 | 江苏省电力公司电力科学研究院 | High precision voltage power frequency measurement system and method based on intelligent substation |
-
1979
- 1979-11-29 JP JP15655379A patent/JPS5677761A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105467207A (en) * | 2016-01-19 | 2016-04-06 | 江苏省电力公司电力科学研究院 | High precision voltage power frequency measurement system and method based on intelligent substation |
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