3-5
INSTRUMENT START-UP
Now that you have familiarized yourself with the layout of the sweep
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 681XXA
Connect the 681XXA 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 start-up display (shown be-
low) appears on the data display. It provides you
with the revision level of the installed firmware and
informs you that instrument is loading programs.
The start-up display remains displayed until the
sweep generator has loaded all programs.
Upon completion of power up, the 681XXA returns
to the exact configuration it was in when last
turned off.
Standby
Operation
Whenever the sweep 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 681XXA is place in op-
eration.
NOTE
During standby operation, the fan runs
continuously.
Press
LINE
to switch the 681XXA 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 sweep generator operations.
LOCAL (FRONT
INSTRUMENT
PANEL) OPERATION
START-UP
LINE
OPERATE
STANDBY
SYSTEM
MODULATION
LEVEL
CONTROL
Line
Key
3-12
681XXA OM
