HP 3585A Service Manual page 39

Model 3585A
After completing a measurement with a narrow Frequency Span, it is sometimes desirable to
return to a full 0 Hz to 40 MHz Span to locate the next signal to be measured without preset-
ting the entire instrument. This can be done by pressing
tion does nothing but set the Center Frequency to 20 MHz and the Frequency Span to 40
MHz. It does not change the Marker position, erase Offsets, activate or deactivate any
front-panel functions or change the values of the operating parameters. (With
tivated, the RBW, VBW and Sweep Time parameters are coupled to Frequency Span and
may, therefore, change when
Resolution Bandwidth caused by pressing
The 3585A communicates with the operator via alphanumeric messages that appear on the
CRT screen. To call the operator's attention to these messages, it is equipped with an audi­
ble alerting device, called the "beeper", which produces a gentle (yet penetrating) high­
pitched "beep" tone. The beeper sounds a single "beep" whenever a message of importance
initially appears on the screen; and "beeps" again whenever the condition that produces the
message is repeated. The beeper also sounds whenever an error is detected in the internal test
routine that is performed during the turn-on sequence and each time the instrument is
preset.
The beeper is automatically enabled by
and reenabled by entering
[,) ' f ELp
is pressed. The change in Center Frequency and/or
[,)' E L fp
initiates an Automatic Calibration.)
THE BEEPER
� � g �
. It can be disabled by entering
l o n l '
5
Operation Overview
F"ULL .
. The FULL SWEEP func-
SWEEP
[f]
COUPLED
:,";
, ' ,
ac-
5
3-7