KYORITSU 2413F - Manual (Page 16)

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５−３ How to Use Peak Hold Function
10ms or 100ms response time can be selected for peak hold
measurement. Make selection according to your application needs.
(1)
With the transformer jaws clamped onto the conductor under test,
slide the peak hold switch from the OFF position to the desired
peak response time position.
(2) The peak hold display reads 1/ √2 of the peak current value.
Therefore, an RMS reading will be obtained when the current
under test has a sinusoidal waveform.
I
(3) Slide the peak hold switch back to the OFF position for a reset.
Note 1 ：KEW SNAP 2413F uses an analogue peak hold circuit to
ensure a quick response to input current. Because of the
nature of this circuit, the peak hold reading may gradually fall
or, in a rare case, rise with time. This is likely to be apparent
when the instrument is used in a high temperature and high
humidity environment. Therefore, the instrument will not be
suitable for making peak measurement over an extended
period of time. In case of such a need, connect a recorder to
the instrument via the analogue output terminal.