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3-5 INSTRUMENT START-UP Now that you have familiarized yourself with the layout of the signal
generator’s front panel controls and data display, you are ready to be
-
gin operating the instrument. Begin by powering it up.
Powering Up
the 681XXC
Connect the 681XXC to an ac power source by fol
-
lowing the procedure in the Installation chapter.
This automatically places the instrument in opera
-
tion (front panel OPERATE LED on).
Start-Up
Display
During power up, the message Please Wait...
LOADING PROGRAMS appears on the data display.
When all programs have been loaded, the start-up
screen (below) is displayed. It provides you with the
model number of the signal generator and the revi
-
sion level of the installed firmware.
The 681XXC then returns to the exact configuration
it was in when last turned off.
Standby
Operation
Whenever the signal generator is not being used, it
should be left connected to the power source and
placed in standby. Standby operation provides
power to keep the internal time base at operating
temperature. This assures specified frequency accu
-
racy and stability when the 681XXC is place in op
-
eration.
NOTE
During standby operation, the fan runs
continuously.
Press LINE to switch the 681XXC from OPERATE
(green LED on) to STANDBY (orange LED on).
NOTE
When switching to operate from standby,
allow at least a 30-minute warmup before
beginning signal generator operations.
3-14 681XXC OM
LOCAL (FRONT INSTRUMENT
PANEL) OPERATION START-UP
LINE
OPERATE
STANDBY
SYSTEM
MODULATION
LEVEL
CONTROL
Line
Key