Terminating360B Source Lock Mode Opera-
tions
Toterminate 360B VNA source lock mode opera-
tions, you must first return the 681XXC to local con-
trol and then turn off the SS Mode.
Toreturn the 681XXC to local control, turn off the
360B VNA.
On the 681XXC, press SYSTEM , then Reset . This
turns off the Secure mode.
Next, press SYSTEM , then Config to access the
System Configuration Menu display.
At the System Configuration Menu,press GPIB .
When the Configure GPIB Menu (shown below) is
displayed, press SS Mode to turn the SS mode off.
Tracking
Mode When operating in tracking mode, the 360B steers
its second local oscillator frequency and phase sig-
nal so as to phase-lock itself to the reference signal
from the 681XXC. Due to the inherent resolution of
the 360B’sfrequency readout, frequency resolution
is limited to 1 kHz intervals.
TrackingMode Configuration
In order for the 681XXC to operate with a 360B in
tracking mode, the signal generator must be operat-
ing in normal mode (SS Mode off). In addition, its
GPIB address and data terminator must match the
System Bus source address and data terminator
that are set on the 360B VNA.
Toverify the GPIB address and data terminator or
to turn the SS mode off, press SYSTEM .Atthe
System Menu display,press Config . When the Sys-
tem Configuration Menu is displayed, press GPIB .
The Configure GPIB Menu (shown below) is dis-
played.
7-14 681XXC OMUSE WITH USE WITH A 360B VECTOR
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