JPS55144554A - Spectrum analyzer - Google Patents

Spectrum analyzer

Info

Publication number
JPS55144554A
JPS55144554A JP5201579A JP5201579A JPS55144554A JP S55144554 A JPS55144554 A JP S55144554A JP 5201579 A JP5201579 A JP 5201579A JP 5201579 A JP5201579 A JP 5201579A JP S55144554 A JPS55144554 A JP S55144554A
Authority
JP
Japan
Prior art keywords
frequency
local oscillator
output
narrow
spectrum
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
JP5201579A
Other languages
Japanese (ja)
Other versions
JPS5760579B2 (en
Inventor
Masaaki Hirose
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 JP5201579A priority Critical patent/JPS55144554A/en
Publication of JPS55144554A publication Critical patent/JPS55144554A/en
Publication of JPS5760579B2 publication Critical patent/JPS5760579B2/ja
Granted legal-status Critical Current

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  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE: To stably and accurately observe the narrow band spectrum by a spectrum analyzer by inserting a sample-holding circuit thereinto to correct only the frequency variation of a voltage controlled variable local oscillator and stabilizing the local oscillator.
CONSTITUTION: When switches S1, S2 are set as shown, a local oscillator Of is controlled by the output of a lamp voltage generator R to sweep in narrow frequency band. Since the output frequency of the local oscillator Ov retains substantially predetermined constant value determined by a voltage source V, the narrow higher and lower frequency range spectrum is presented in an oscillograph B around the desired frequency determined by the adjustment of the voltage source V as a center. In this case, the output of a frequency discriminator Df is applied through a sample-holding circuit H and amplifiers A, E to a voltage controlled variable frequency local oscillator Ov. Therefore, the frequency variation is eliminated to stably produce a predetermined constant local oscillating frequency therefrom. Since the output of the discriminator Df is intermittently extracted and retained in the circuit H to control the local oscillator Ov, the narrow band spectrum can be accurately observed.
COPYRIGHT: (C)1980,JPO&Japio
JP5201579A 1979-04-28 1979-04-28 Spectrum analyzer Granted JPS55144554A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5201579A JPS55144554A (en) 1979-04-28 1979-04-28 Spectrum analyzer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5201579A JPS55144554A (en) 1979-04-28 1979-04-28 Spectrum analyzer

Publications (2)

Publication Number Publication Date
JPS55144554A true JPS55144554A (en) 1980-11-11
JPS5760579B2 JPS5760579B2 (en) 1982-12-20

Family

ID=12902979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5201579A Granted JPS55144554A (en) 1979-04-28 1979-04-28 Spectrum analyzer

Country Status (1)

Country Link
JP (1) JPS55144554A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654886A (en) * 1985-04-25 1987-03-31 Ifr, Inc. Local oscillator null circuit and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08928Y2 (en) * 1990-11-30 1996-01-17 新次 滝沢 Chopstick rest

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4654886A (en) * 1985-04-25 1987-03-31 Ifr, Inc. Local oscillator null circuit and method

Also Published As

Publication number Publication date
JPS5760579B2 (en) 1982-12-20

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