KYORITSU 2009R - Manual (Page 23)

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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.
② Press the mode selector button three times to enter from the
normal mode to the frequency measurement mode. "Hz" should
be indicated on the display.
③ Follow instructions for ACA or ACV measurement and take the
frequency reading.
NOTE
● When the voltage under test measures 3% of the range 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.