User`s guide

2 Making Measurements
Crest Factor
34 U1273A/U1273AX User’s Guide
Crest Factor
The crest factor may be determined by using this formula:
You may refer to “Capturing Peak Values (Peak)” on page 94
on how to obtain the peak values.
The crest factor may be up to 3.0 at full- scale except for the
1000 V range where it is 1.5 at full scale, as explained in the
table below:
Voltage range Crest factor Maximum input (V
peak
)
30 mV 3 +/– 90 mV
300 mV 3 +/– 900 mV
3 V 3 +/– 9 V
30 V 3 +/– 90 V
300 V 3 +/– 900 V
1000 V 1.5 +/– 1500 V
Crest factor
Peak value
True RMS value
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=
WARNING
Exceeding the crest factor limit may result in an incorrect or a lower
reading. Do not exceed the crest factor limit to avoid instrument
damage and the risk of electric shock.