10
Operating Precautions
Measurement precautions
DANGER
Do not input a voltage that exceeds the measurement module’s
maximum input voltage, maximum rated terminal-to-ground voltage, or
maximum rated channel-to-channel voltage to any channel.
Do not input a voltage to a resistance measurement terminal.
Measurement modules have dierent maximum input voltages, maximum rated
terminal-to-ground voltages, and maximum rated channel-to-channel voltages. For
more information about maximum input voltages, maximum rated terminal-to-ground
voltages, and maximum rated channel-to-channel voltages, see “Specications”
(p. 87).
Doing so could cause electric shock or damage the instrument.
Do not use the instrument or measurement modules to measure a main
power supply circuit.
The U8550, U8551, U8552, U8553, LR8530, LR8531, LR8532, and LR8533
measurement modules have terminal-to-ground voltages that qualify as CAT II, but
they cannot be used to perform CAT II, CAT III, or CAT IV measurement.
Never input a CAT II, CAT III, or CAT IV voltage across measurement terminals.
Doing so could cause electric shock or damage the instrument.
Turn o power to the circuit under measurement before performing
measurement.
Failure to do so could cause electric shock or damage the instrument.
WARNING
Do not allow the instrument to get wet.
Do not operate the instrument with wet hands.
Doing so could cause electric shock.
Eect of induction potential
Displayed values can frequently uctuate due to induction potential even when no
voltage is applied. This, however, is not a malfunction.