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2
Making Measurements
Crest Factor
The crest factor may be determined by using this formula:
You may refer to "Capturing Peak Values (Peak)" on page
values.
The crest factor may be up to 3.0 at full-scale except for the 600 V and the 1000 V range
where it is at 2.5 and 1.5 respectively, as shown in the table below:
Vol tage range
60 mV
600 mV
6 V
60 V
600 V
1000 V
Exceeding the crest factor limit may result in an incorrect or a lower reading. Do not
WARNING
exceed the crest factor limit to avoid instrument damage and the risk of electric shock.
52
Peak value
Crest factor
=
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
True rms value
Crest factor
3.0
3.0
3.0
3.0
2.5
1.5
104
on how to obtain the peak
Maximum input (V
)
peak
+/– 180 mV
+/– 1800 mV
+/– 18 V
+/– 180 V
+/– 1500 V
+/– 1500 V
Keysight U1281A/U1282A User's Guide
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