The HM-250 is a distortion meter capable
of 0.1% full scale measurement continuously over the frequency
range of 20 Hz to 20 kHz with a typical residual distortion of
0.01%. It makes full use of pushbutton switches and provides a
calibration which can be activated with a single operation regardless
of the selected distortion measurement range. Carrier frequency
elimination is performed by an automatic tuning technique thereby
greatly simplifying operation. The HM-250 is also usable as a
high-sensitivity (100…V f.s.) AC voltmeter.
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