Model 3585A
Operation Overview
SWEEP A N D TRI G G E R FU NCTI O N S
SWEEP
SWEEP I NG
o
I
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Sweep Functions:
SWEEP I NG
o
CONT
G
S I NGLE
G
Lights to indicate that a frequency sweep is in progress . Goes out between sweeps
and during mid-sweep interruptions .
Repetitive frequency sweeps synchronized by sweep trigger . Upon completion of
each sweep , the sweep is automatically rearmed and a new sweep is initiated on
CONT
receipt of a sweep trigger. Pressing
0
resets the sweep that is currently in pro-
gress (except when switching from Single) .
Single frequency sweep initiated by sweep trigger . Once a Single sweep has ter-
S I NGLE
minated, it resets to the Start Frequency to await rearming . Pressing
(ex-
cept when switching from Cont .) resets and/or rearms the sweep, enabling a new
sweep to be initiated by a sweep trigger . *
MAN
SWEEP
ENTRY
Selects Manual mode; automatically activates
; sets Manual frequency
equal to current Marker frequency; prefaces Manual frequency, enabling it to be
changed by Step or Numeric Entry.
Trigger Functions:
G
G
G
E X T TR I GGER
Sweep automatically triggered after rearming .
Sweep internally triggered at power-line frequency (48 Hz to 440 Hz) .
Sweep triggered by High-to-Low transition or contact closure at EXT TRIG in
put . *
High
=
open or
+
2.0V to
+
35V; Low
=
short to ground (outer shell) or
+
1 . 3V
to - 35V. Sweep triggered by High-to-Low transition ; triggers are accepted only
after the sweep has been rearmed . (Rearming time ranges from about 25
milliseconds to 2.4 seconds , depending on RBW /VBW settings .) Triggers applied
during a sweep or during rearming are ignored .
*Sweep rearming and triggering operations are inhibited during Automatic Calibrations and also while operating
parameters are being changed .
3-21
Summary of Contents for 3585A
Page 264: ......
