High energy circuit safety precautions
To optimize safety when measuring voltage in high energy distribution circuits, read and use
the directions in the following warning.
WARNING Dangerous arcs of an explosive nature in a high energy circuit can cause
severe personal injury or death. If the multimeter is connected to a high
energy circuit when set to a current range, low resistance range, or any other
low impedance range, the circuit is virtually shorted. Dangerous arcing can
result even when the multimeter is set to a voltage range if the minimum volt-
age spacing is reduced in the external connections.
When making measurements in high energy circuits, use test leads that meet the following
requirements:
• Test leads should be fully insulated.
• Only use test leads that can be connected to the circuit (e.g., alligator clips, spade lugs,
etc.) for hands-off measurements.
• Do not use test leads that decrease voltage spacing. These diminishes arc protection and
create a hazardous condition.
Use the following sequence when testing power circuits:
1. De-energize the circuit using the regular installed connect-disconnect device, such as a
circuit breaker, main switch, etc.
2. Attach the test leads to the circuit under test. Use appropriate safety rated test leads for
this application.
3. Set the multimeter to the proper function and range.
4. Energize the circuit using the installed connect-disconnect device and make measure-
ments without disconnecting the multimeter.
5. De-energize the circuit using the installed connect-disconnect device.
6. Disconnect the test leads from the circuit under test.
WARNING The maximum common-mode voltage (voltage between INPUT LO and the
chassis ground) is 500V peak. Exceeding this value may cause a breakdown
in insulation, creating a shock hazard.
Basic Measurements 2-11
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