User manual

hands-off measurements.

 Do not use test leads or accessories that decrease voltage spacing. This diminishes arc

protection and creates a hazardous condition.

Use the following sequence when measuring high energy circuits:

1. De-energize the circuit using a 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.

3. Set the multimeter to the proper measurement function and range.

4. Energize the circuit using the installed connect-disconnect device and make measurements

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 COM and the chassis

ground) is 500V peak. Exceeding this value may cause a breakdown in insulation,

creating a shock hazard.

2.6.5 Power-on Defaults

2831E and 5491B have a factory default setting for the power-on setting.

Since the basic measurement procedures in this manual assume the factory defaults, reset the

instrument to the factory settings when following step-by-step procedures. Table 2-2 lists the factory

default settings.

Table 2-2 Factory Default Settings

Setting Factory Default

Function

Range

Rate

Remote/Local

Trigger Mode

Relative Mode

Compare Mode

HI Limit

Lo Limit

Percent Mode

Reference

Max/Min Mode

Reading Hold

Secondary Display Mode

Cal Mode

DCV

AUTO

Medium

Local

Immediate

OFF

-1

OFF