B&K Precision 5491B - Manual - Manual (Page 16)

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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
OFF
+1
-1
OFF
+1
OFF
OFF
OFF
OFF