HT instruments HT9021 - Manual (Page 16)

HT9021
EN - 15
4.3.8. Frequency and Duty cycle measurement
CAUTION
• On frequency test with test leads the maximum input for AC Voltage
measurements is 1000Vrms. Do not take any voltage measurement
exceeding this limit in order not to risk electrical shock or damage the
tester
• On frequency test with jaws make sure that all the test leads are
disconnected from the meter terminals for current measurement.
Fig. 10: Taking frequency and duty cycle measurements
1. Rotate the switch on position for frequency measurement with test leads or 60A ,
600A
or 1000A positions for frequency measurements with jaws
2. Pushing Hz% key the “Hz” symbol for frequency measurement or the “%” symbol for
duty cycle measurement are shown at display
3. Insert the red test lead plug into V Ω
CAP Temp
jack and the black test lead plug
into COM jack (see Fig. 10 – left side) for frequency measurement with test leads.
Open the clamp and put the conductor to be tested in the middle of the clamp jaw (see
Fig. 10 – right side) for frequency measurements with jaws, then reading will be
displayed. Bargraph is disabled in frequency and duty cycle test
4. When “O.L.” symbol is displayed, the result exceeds the maximum value that the
instrument is capable of measuring
5. For HOLD feature please refer to § 4.2