LEM ISO plus Manuel D'utilisation page 18

Basic operation

Select the current measurement function by turning the rotary switch to the
mA position.
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Press the button to view and to set the transformation ratio of a
connected probe (current or voltage). The big digits show Pro and the mA
symbol next to the big display flashes.
With the button it can be selected whether a current or a voltage
output probe will be connected to the instrument. – toggle between mA or
mV symbols.
With the key the transformation ratio selection can be entered. Now the
default ratio shown in the small display flashes. The
the following loop of ratios: OFF 1, 10, 100, 500 or 1000.
1 and OFF in mA means direct current measurement with the delivered test
leads. 1:10, 1:100, 1:500 or 1:1000 means measurement through an external
current transformer with the selected transformation ratio.
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Press the button to return to the main screen. If mA and a ratio has been
selected then the large I and the current clamp symbol light up. If mV and a
ratio has been selected then the large U and the current clamp symbol are
displayed. The main display shows the scaled value in Amps.
For safety reasons, if switching out of the mA position the ratio screen turns
back to the default which is mA and a 1:1 ratio for direct current
measurement.
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Connect the measuring leads into the measuring circuit (at direct current
measurement) or clamp the external probe around the single live conductor.
The instrument displays in the main display the scaled Amps RMS value and
the frequency of the AC component in the small display.
To activate the LIMIT (alarm) function press the
press the key again and use the
to increment the digit. When in this mode pressing the
limit value off completely. To set the higher limit press the
arrow keys as above. To activate the LIMIT function press the
deactivate the LIMIT (alarm) function turn the rotary switch to a new position
key cycles through
key. To set the lower limit
to selects the digit and the
first turns the lower
key and use the
key again.To
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key