FLUKE 87V/IMSK User Manual for the Fluke 87V/IMSK Industrial Multimeter Service Combo Kit with current clamp, 1000 V, 10 A

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Multimeters

Making Measurements

Measuring Duty Cycle

Duty cycle (or duty factor) is the percentage of time a

signal is above or below a trigger level during one cycle

(Figure 9). The duty cycle mode is optimized for

measuring the on or off time of logic and switching

signals. Systems such as electronic fuel injection systems

and switching power supplies are controlled by pulses of

varying width, which can be checked by measuring duty

cycle.

To measure duty cycle, set up the Meter to measure

frequency; then press Hz a second time. As with the

frequency function, you can change the slope for the

Meter's counter by pressing E.

For 5 V logic signals, use the 6 V dc range. For 12 V

switching signals in automobiles, use the 60 V dc range.

For sine waves, use the lowest range that does not result

in multiple triggering. (Normally, a distortion-free signal

can be up to ten times the amplitude of the selected

voltage range.)

If a duty cycle reading is unstable, press MIN MAX; then

scroll to the AVG (average) display.

-Slope

Trigger Point

+Slope

Trigger Point

30% Above

+Slope

70% Below

-Slope

100%

iy3f.eps

Figure 9. Components of Duty Cycle Measurements

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FLUKE 87V/IMSK Industrial Multimeter Service Combo Kit with current clamp, 1000 V, 10 A