Apparatus for measuring a signal level

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Self-calibration

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Details

324 74, 324 77A, 324103P, G01R 102, G01R 1900, G01R 3500

Patent

active

046331735

ABSTRACT:
A measured signal is supplied to an indication section through a high-frequency amplifier, a frequency converter, and an intermediate frequency amplifier. A predetermined local oscillation signal from a local oscillator is supplied to the frequency converter. A reference signal generator generates harmonic pulses having a uniform level at a spectral interval substantially equal to or larger than the predetermined passband of the intermediate frequency amplifier, the uniform level being used to calibrate a level of the signal to be measured. A frequency setting section sets the frequency of the measured signal. A first switching section switches an input to the high-frequency amplifier to an output side of the reference signal generator in accordance with the frequency set by the frequency setting section. A control section controls an oscillation frequency of the local oscillator so as to set an indicated value at the indication section to a maximum value while an output from the reference signal generator is supplied to a high-frequency amplifier, and controls a gain of an amplifier such that the indicated value at the indication section is set to a predetermined indicated value while the local oscillator is being operated to provide the maximum value. And a second switching section switches the input to the high-frequency amplifier to an input side of the measured signal after gain control is performed by the control section.

REFERENCES:
patent: 3486112 (1969-12-01), Bayer
Christiansen et al; "Waveform Characteristics Measuring"; IBM Technical Disclosure Bulletin; vol. 7, No. 4; Sep. 1964; p. 264.

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