Fluke II Series Operator's Manual page 16

Front Panel Keys (cont.)
x
Opens and closes an internal connection between
the V GUARD (voltage guard) and OUTPUT LO.
The Calibrator powers up with the V GUARD
internally connected to OUTPUT LO and the x
indicator off. Toggling x on (so it lights)
disconnects OUTPUT LO from the V GUARD.
The V GUARD binding post provides an external
connection point for the voltage internal guard. For
a UUT with ungrounded inputs, the V GUARD
should be connected to LO internally. (The EX
GRD key is toggled off.) For a UUT with a
grounded input, the GUARD may be externally
connected to the grounded UUT input. (The EX
GRD key is toggled on.)
w
Enables and disables the -03 Wideband AC option
and sets the Calibrator to standby mode. When
enabled, the ac voltage output over the range of
10 Hz to 30 MHz is available at the front panel
WIDEBAND connector. The wideband function is
disabled whenever w is toggled off, or when
another function (such as current) is selected.
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