4 Keysight U1281A/U1282A Service Guide
Safety Considerations
Read the information below before using this instrument.
The following general safety precautions must be observed during all phases of
operation, service, and repair of this instrument. Failure to comply with these
precautions or with specific warnings elsewhere in this manual violates safety
standards for design, manufacture, and intended use of the instrument. Keysight
Technologies assumes no liability for the customer’s failure to comply with these
requirements.
– Do not exceed any of the measurement limits defined in the specifications
to avoid instrument damage and the risk of electric shock.
– Do not use the multimeter if it is damaged. Before you use the
multimeter, inspect the case. Look for cracks or missing plastic. Pay
particular attention to the insulation surrounding the connectors.
– Inspect the test leads for damaged insulation or exposed metal. Check
the test leads for continuity. Replace damaged test leads before you use
the multimeter.
– Do not operate the multimeter around explosive gas, vapor, or wet
environments.
– Do not apply more than the rated voltage (as marked on the multimeter)
between terminals, or between terminal and earth ground.
– Never use the multimeter in wet conditions or when there is water on the
surface. If the multimeter is wet, ensure that the multimeter is dried only
by trained personnel.
– Before use, verify the multimeter’s operation by measuring a known
voltage.
– When measuring current, turn off the circuit power before connecting the
multimeter in the circuit. Remember to place the multimeter in series
with the circuit.
– When servicing the multimeter, use only the specified replacement parts.
– Use caution when working above 60 V DC, 30 V AC rms, or 42.4 V peak.
Such voltages pose a shock hazard.
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