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 681XXB
Connect the 681XXB 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 (below) ap-
pears 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 gener-
ator has loaded all programs.
Upon completion of power up, the 681XXB 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 681XXB is place in op-
eration.
NOTE
During standby operation, the fan runs
continuously.
Press
LINE
to switch the 681XXB 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
681XXB OM
