Apparatus and method for expanding the frequency range over which electrical signal amplitudes can be accurately measured
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United States of America Patent
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Dec 18, 1990
Grant Date -
N/A
app pub date -
May 10, 1989
filing date -
May 10, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
It has been found that the ground lead of a measurement instrument probe has an inductance which, when coupled with the capacitance of the rest of the probe, forms a resonant circuit. The net result is a peak in the frequency response of the probe which interferes with accurate amplitude measurements of test signals having a frequency above some threshold. Pursuant to the present invention, a resistor is added to the measurement instrument probe whose value substantially flattens the frequency response of the probe and permits accurate amplitude measurements over a substantially greater frequency range. This resistor, either having a fixed or adjustable value, can be added to the measurement instrument probe or can be included in an adjunct which fits over a probe end.
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