KYORITSU 2009A - Manual (Page 21)

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DANGER
●Never use the instrument on a high voltage circuit above 750VAC.
This may cause electrical shock hazard and damage to the
instrument or the circuit under test.
●Do not make measurement with the battery compartment cover
removed.
●Do not make current measurement with the test leads plugged into the
instrument.
●Keep your fingers and hands behind the barrier during measurement.
①Set the function selector switch to the "∼A" or "∼V" position.
②Press the mode selector button three times to enter from the normal
mode to the frequency measurement mode. "Hz" should be indicated
on the display.
③Follow instructions for ACA or ACV measurement and take the
frequency reading.
NOTE
● When the voltage under test measures 3% of the full scale or less,
or the frequency of the current or voltage is 40Hz or less, "LoHz" is
indicated on the display.
６−８ Peak Measurement
●In the PEAK mode, the display shows current or voltage's crest in
effective value. (For example, when the current or voltage is sinusoidal,
the reading equals the crest value divided by the square root of two.)
The display reading is constantly updated with a maximum crest.
●In this mode, "PEAK" is indicated on the display.
●Response time is 300ms in DC measurement and 10ms in AC
measurement.