Fluke 28IIEX Fluke 28IIEx User Manual - Page 44

How to Determine Pulse Width, HiRes Mode

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28 II Ex Users Manual How to Determine Pulse Width For a periodic waveform (its pattern repeats at equal time intervals), you can find the time that the signal is high or low as follows: 1. Measure the signal's frequency. 2. Push G a second time to measure the signal's duty cycle. Push E to select a measurement of the signal's positive or negative pulse, refer to Figure 9. 3. Use this formula to find the pulse width: Pulse Width (in seconds) = % Duty Cycle ÷ 100 Frequency HiRes Mode On the Product, push H for one second to enter the highresolution (HiRes) 4-1/2 digit mode. Measurements are shown at 10 times the usual resolution with a maximum display of 19,999 counts. The HiRes mode works in all modes but capacitance, frequency counter functions, temperature, and the 250 μs (peak) MIN MAX modes. To go to to the 3-1/2 digit mode, push H for one second. 34

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28 II Ex
Users Manual
34
How to Determine Pulse Width
For a periodic waveform (its pattern repeats at equal time
intervals), you can find the time that the signal is high or
low as follows:
1.
Measure the signal's frequency.
2.
Push
G
a second time to measure the signal's
duty cycle. Push
E
to select a measurement of
the signal's positive or negative pulse, refer to
Figure 9.
3.
Use this formula to find the pulse width:
Pulse Width
=
% Duty Cycle
÷
100
(in seconds)
Frequency
HiRes Mode
On the Product, push
H
for one second to enter the high-
resolution (HiRes) 4-1/2 digit mode. Measurements are
shown at 10 times the usual resolution with a maximum
display of 19,999 counts. The HiRes mode works in all
modes but capacitance, frequency counter functions,
temperature, and the 250
μ
s (peak) MIN MAX modes.
To go to to the 3-1/2 digit mode, push
H
for one second.