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11
the clamp meter beeps again and switches o automatically. Press any key to restore
the clamp meter to operating status� The symbol appears on the display� To deactivate
the automatic switch-o, hold down the “FUNC.” key for more than 2 seconds and switch
on the clamp meter at the same time� The symbol disappears� Restart after switching
o the meter, the automatic switch-o can be restored.
Auto-ranging
The meter automatically selects the measuring range that is best suited for the mea-
surement performed� The measuring unit and resolution are adjusted at the same time�
AC zero input behavior of True-rms meters
Unlike averaging meters, which can accurately measure only pure sinewaves, True-rms
meters accurately measure distorted waveforms� Calculating True-rms converters
require a certain level of input voltage to make a measurement� This is why ac voltage
and current ranges are specied from 5 % of range to 100 % of range. Non-zero digits
that are displayed on a True-rms meter when the test leads are open or are shorted are
normal. They do not aect the specied ac accuracy above 5 % of range.
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