UNI-T UT70D, Руководство по эксплуатации, Страница: 27 / 48

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Although it is possible to select frequency and duty
cycle
measurement mode at resistance, continuity and
diodes ranges, these functions cannot be used.
It is recommended to use mV range which has
the highest sensitivity.
To obtain a stable reading when measuring input
scope 30V rms frequency signal, set the rotary
switch to
V or V .
When frequency measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test, and remove the testing
leads away from the input terminals of the Meter.
The attenuate amplitude of signal is different from
different measuring positions and ranges, therefore
the required input amplitude is different when
measuring frequency at different measuring positions
and ranges.
Duty Cycle Measurement
The duty cycle measurement range is 1% ~ 99%.
To measure duty cycle:
1. Set up the Meter to measure frequency.
2. To select duty cycle, press Hz again (or until the %
symbol is shown on the display).
3. Connect the test leads across the object being
measured.The measured value shows on the display.
Note
Press the Hz button in the MAX/MIN, HOLD mode,
it exits these modes.
The attenuate amplitude of signal is different from
different measuring positions and ranges, therefore
the required input amplitude is different when
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