Relative Voltmeter for VHF/UHF Signal Generator Attenuator Calibration

Weinschel, Bruno O.; Sorgor, G. U.; Hedrich, A. L.

doi:10.1109/ire-i.1959.5006830

Cited by 22 publications

(3 citation statements)

References 4 publications

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“…G OOD I N S E R T I O N loss m e a s u r e m e n t accuracies have been achieved a t fixed frequencies by manually operated systems [l]- [3], [12] using t h e parallel I F substitution method. Inaccuracies a r e reduced by 1) t u n i n g of source and load impedances, 2) using a precision waveguide-below-cutoff attenuator as I F substitution s t a n d a r d [3]- [5], and 3) close control of environmental t e m p e r a t u r e and performing of measurement after thermal equilibrium is reached.…”

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confidence: 99%

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A 1–18-Ghz attenuator calibrator

Weinert¹,

Weinschel²

1976

IEEE Trans. Instrum. Meas.

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This single-channel parallel IF substitution system performs attenuator calibrations in a stepped frequency mode to 110 dB through 1-18 GHz, with the accuracy of a fixed frequency system. Measurement time is reduced and operation is simplified by use of two digitally controlled, frequency-locked oscillators as signal source and local oscillator, a 30-MHz precision digital substitution standard and an adaptive bandwidth closed-loop substitution technique. Incident power and source impedance at the insertion point are established by a precision broad-band power splitter and a leveling loop using a barretter as the microwave detector. The load impedance is established by a low mismatch masking attenuator. Measurement sequences can be controlled manually or by a programmable calculator which processes the data. The IF substitution process when under calculator control is terminated when a signal buried in the noise is recovered and the servo-loop is balanced.

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confidence: 99%

“…Inaccuracies a r e reduced by 1) t u n i n g of source and load impedances, 2) using a precision waveguide-below-cutoff attenuator as I F substitution s t a n d a r d [3]- [5], and 3) close control of environmental t e m p e r a t u r e and performing of measurement after thermal equilibrium is reached.…”

mentioning

confidence: 99%

A 1–18-Ghz attenuator calibrator

Weinert¹,

Weinschel²

1976

IEEE Trans. Instrum. Meas.

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show abstract

“…It has been determined experimentally that -for a range of at least 80 dB, such deviations remain less than 0.01 dB if the signal power in the mixer is always at least 30 dB below the local oscillator power in the mixer. Some analysis of this error has appeared [37,38] but additional work will be needed if aU other sources of error in this method are reduced to the point where 0.001 dB is a significant amount of error.…”

mentioning

confidence: 99%