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2-8. Crest factor table
Background
Crest factor is the ratio of the peak signal amplitude to the RMS value of the
signal. It determines the accuracy of AC measurement.
If the crest factor is less than 3.0, voltage measurement will not result in error due
to dynamic range limitations at full scale.
If the crest factor is more than 3.0, it usually indicates abnormal waveform as
seen from the below table.
Waveform
Shape
Crest factor
Square wave
1.0
Sine wave
1.414
Triangle sawtooth
1.732
Mixed frequencies
1.414 ~ 2.0
SCR output 100% ~
10%
1.414 ~ 3.0
White noise
3.0 ~ 4.0
AC Coupled pulse
train
3.0
Spike
>9.0
2-9. AC/DC/AC+DC Current Measurement
Current type
AC
0 ~ 10A
DC
0 ~ 10A
AC+DC
0 ~ 10A
AC
2
+DC
2
*AC+DC=
(AC = true RMS)
1. Activate ACI/ DCI
Press the ACI (AC Current) key or the DCI (DC
Current) key.
or
For AC+DC Current, press the ACI key and the
DCI key together.
2. ACI/DCI mode display
appears
AC(DC) + A
Indicates AC, DC, AC+DC Current
(Note: AC = true RMS)
