JPS5697881A - Frequency measuring device - Google Patents

Frequency measuring device

Info

Publication number
JPS5697881A
JPS5697881A JP40680A JP40680A JPS5697881A JP S5697881 A JPS5697881 A JP S5697881A JP 40680 A JP40680 A JP 40680A JP 40680 A JP40680 A JP 40680A JP S5697881 A JPS5697881 A JP S5697881A
Authority
JP
Japan
Prior art keywords
frequency
local oscillation
higher harmonic
found
input signal
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
Application number
JP40680A
Other languages
Japanese (ja)
Other versions
JPS5849828B2 (en
Inventor
Naoharu Niki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Advantest Corp
Original Assignee
Advantest Corp
Takeda Riken Industries Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Advantest Corp, Takeda Riken Industries Co Ltd filed Critical Advantest Corp
Priority to JP40680A priority Critical patent/JPS5849828B2/en
Publication of JPS5697881A publication Critical patent/JPS5697881A/en
Publication of JPS5849828B2 publication Critical patent/JPS5849828B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

PURPOSE: To take accurate measurement even if an input frequency varies, by measuring an intermediate frequency and local oscillation frequency at least three times at intervals of time, and by determining a higher harmonic degree by obtaining a mean value of two different combinations.
CONSTITUTION: An input signal frequency is measured by control means 25 at least three times simultaneously at intervals of time through intermediate frequency measuring means 17 and local oscillation frequency measuring means 18. As for two different combinations of those three measurements or more, higher harmonic degrees (n) are found from two intermediate frequencies Fi1 and Fi2, and local oscillation frequencies Fl1 and Fl2 by using expression I. From those arithmetic results, higher harmonic degree N is found and from this N, local oscillation frequency Fl and corresponding intermediate frequency Fi, the frequency of the input signal is found by arithmetic circuit 29. In this constitution, since the higher harmonic degree is determined by averaging the arithmetic results, accurate measurements can be taken even if the frequency of the input signal varies.
COPYRIGHT: (C)1981,JPO&Japio
JP40680A 1980-01-07 1980-01-07 frequency measurement device Expired JPS5849828B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP40680A JPS5849828B2 (en) 1980-01-07 1980-01-07 frequency measurement device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP40680A JPS5849828B2 (en) 1980-01-07 1980-01-07 frequency measurement device

Publications (2)

Publication Number Publication Date
JPS5697881A true JPS5697881A (en) 1981-08-06
JPS5849828B2 JPS5849828B2 (en) 1983-11-07

Family

ID=11472911

Family Applications (1)

Application Number Title Priority Date Filing Date
JP40680A Expired JPS5849828B2 (en) 1980-01-07 1980-01-07 frequency measurement device

Country Status (1)

Country Link
JP (1) JPS5849828B2 (en)

Also Published As

Publication number Publication date
JPS5849828B2 (en) 1983-11-07

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