True RMS Digital Multimeters
Operating Basics
17
a
b
ahr10f.eps
Figure 7. Positive and Negative Duty Factor
Positive duty factor: % duty = (a/b)
x
100
Negative duty factor: % duty = (1–a/b)
x
100
AC vs. DC Coupled Frequency Measurements
When the duty factor measurement mode is off, the frequency measurement is
AC coupled; otherwise, it is DC coupled.
Changing Voltage Range in Frequency Mode
To change voltage range, press RANGE. The voltage range shows momentarily
in the upper display. Continue pressing
RANGE to cycle through the available
voltage ranges until the range you want shows. The default voltage range is
5 V.
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