SEFRAM BK390B User Manual page 40

Make Peak-Hold Measurement
The Peak-Hold mode records wave peak maximum and
minimum input values. Response time of Peak-Hold is 10us.
To use the Peak-Hold mode, press the P-HOLD button to
enable the Peak-Hold mode in the AC or DC measurements.
In this mode, press P-HOLD button to select peak MAX or
MIN value. Press > 1 sec to disable the Peak-Hold mode.
For square wave, use the peak-hold mode in the DC
measurements.
Make AC+DC Measurement
When input signal is ac and dc combinations: AC over DC or
DC over AC, the meter is capable of displaying one AC+DC
(rms) value combined. Define as below :
To use the AC+DC function, turn rotary switch stop in DCV,
DCmV or A position, then press function (yellow) button to
select measurement function.
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