HT instruments HT326 - Manual (Page 15)

HT326
EN - 14
4.3.8. Frequency and Duty Cycle measurement
CAUTION
The maximum input for AC voltage is 600V. Do not attempt to measure
higher voltages to avoid electrical shocks or damages to the instrument.
Fig. 9: Using the instrument for frequency measurement
1. Selecting the position Hz/Duty. The symbol “Hz” is shown at display
2. Insert the test leads into the jacks, the red plug into V
Hz
jack and black plug
into COM jack
3. Connect the test leads to the circuit under test (see Fig. 9). The frequency value will be
displayed
4. For Duty Cycle measurement pres SEL key. The symbol “%” is shown at display
5. Connect the test leads to the circuit under test (see Fig. 9). The percentage value of
duty cycle will be displayed
6. If the message " O.L " is displayed the maximum readable value is reached
7. For HOLD function please refer to § 4.2