Triplett 9320-A - Manual (Page 31)

30 Triplett Model 9320-A
Before testing a capacitor, make sure it is discharged. Use an approved method
for discharging the capacitor. Improperly discharging a capacitor can be danger-
ous and may cause user injury.
Referring to Figure 7, connect the test probes to the capacitor to be tested. If
appropriate, observe the proper polarity. Read the capacitance on the display.
Note:
Larger value capacitors take longer to test. A 1000uF capacitor may take as long
as 30 seconds to test.
9.7 Frequency and Duty Cycle Measurement
Frequency and Duty Cycle can be measured in the V Hz Clamp-on or Hz
modes.
Refer to Section 7.0, Preparation For Use, and Section 8.0, General Measurement
Procedures, before attempting any measurements.
9.7.1 Measuring Frequency and Duty Cycle with Test Leads
Attach the test leads to the meter. The red lead is connected to the V Ω Hz Jack,
and the black lead is connected to the COM Jack. Rotate the FUNCTION switch to
the Hz position or the V
position.
Make certain that the annunciator on the display is not visible. If it is visible,
press the D-HOLD button to turn it off.
The Hz position is very sensitive and is intended to measure low level signals in
electronic circuitry. If it is used to measure the frequency of an AC power line,
small amounts of noise or distortion on the line may cause erratic readings.
The V position is preferred for making measurements on an AC power line.
This mode is less sensitive to the effects of power line noise, and will usually
produce a more stable reading than the Hz mode.
If the Hz position is selected, the meter is ready to measure Frequency immedi-
ately. Connect the test leads to the signal to be measured and read the frequency
on the LCD. To measure the Duty Cycle, press the Hz/DUTY button. The % an-
nunciator will display on the LCD.