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Digital Multimeters
Measurements
13
Measure Frequency and Duty Cycle (17B+/18B+
Only)
The Product can measure frequency or duty cycle while
making either a voltage or a current measurement. Push
to change the Product to frequency or duty cycle.
1. When the Product is in the required function (ac
voltage or ac current), push
.
2. Read the frequency of the signal on the display.
3. To make a duty cycle measurement, push again.
4. Read the percent of duty cycle on the display.
Test LEDs (18B+ Only)
Caution
To prevent possible damage to the Product or
to the equipment under test, disconnect all
test leads from any hazardous voltage before
you switch to the LED TEST function.
The Product tests Light Emitting Diodes (LEDs) either
through the LED test socket on the Meter or through the
test leads.
Note
Do not use the LED Test mode to do LED aging
tests.
To test an LED mounted in the test socket:
1. Turn the rotary switch to LED TEST.
2. Place the leads of the LED into the holes of the LED
test socket on the front of the Meter as shown in
Figure 4.
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