Functions and Features 3
Keysight U1251B and U1252B User’s and Service Guide 87
1 ms Peak Hold
The Peak Hold function allows the measurement of peak voltage for analysis of
components such as power distribution transformers and power factor correction
capacitors. The peak voltage obtained can be used to determine the crest factor:
Crest factor = Peak value/True RMS value
1 Press for more than 1 second to toggle 1 ms Peak Hold mode ON / OFF.
2 Press to scroll through maximum and minimum peak readings.
MAX indicates the maximum peak, while MIN indicates the minimum peak.
3 Press and hold or for more than 1 second to exit this mode.
4 According to the measurements shown in Figure 3-6 on page 88, the crest
Factor will be 2.5048/1.768 =1.416.
NOTE
– If the reading is “OL”, press to change the measuring range and to
re-start the peak-recording measurement.
– If you need to re-start the peak recording, press .
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