42
mV
Hz %
mV
Figure 3-14. Frequency / Duty Cycle Measurement
Model 72-8720: OPERATING MANUAL
I. Measuring Frequency / Duty Cycle
To measure frequency and duty cycle, connect the
Meter as Figure 3-14 and do the following:
1. Insert the red test lead into the
Hz
terminal and the
black test lead into the
COM
terminal.
2. Set the rotary switch to and press
SELECT
button to select the Hz measurement mode for
frequency measurement or % for duty cycle
measurement.
The
SELECT
button cycles among , frequency
and duty cycle.
3. Connect the test leads across with the object being
measured.
The measured value shows on the primary display.
Note
l
l
The requirement of Input amplitude ìaî is as follows:
When 10Hz~40MHz: 200 mV a 30Vrms;
40MHz: Un-specified
When Hz or Duty Cycle measurement has been
completed, disconnect the connection between the
testing leads and the circuit under test and remove
the test leads away from the input terminals.
Warning
To avoid harms to you, please do not attempt to
input tested frequency voltage higher than 30V rms.
