Features and Functions 3
Agilent U1251A/U1252A User’s and Service Guide 67
1 ms Peak Hold
This function allows the measurement of half- cycle peak
voltage for the the analysis of components such as power
distribution transformers and power factor correction capac-
itors. 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 or for more than 1 second to exit this
mode.
4 According to the measurements in Figure 22 on the next
page, the crest Factor will be 2.5048/1.768 =1.416.
• 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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