R3131 Spectrum Analyzer Operation Manual
2.1 Panel Description
2-12
Oct 28/98
2.1.3
Rear Panel
This subsection shows the rear panel and describes its terminals and connectors.
Figure 2-3 Rear Panel
Control
Description
1
RS-232 connector
Connector for an external unit used to control the spectrum
analyzer through an RS-232 interface
2
PRINTER connector
Connector used when attaching a Centronix printer
3
EXTERNAL TRIGGER
terminal
Approximately 10 k
Ω
input impedance; starts sweeping at
the leading or trailing edge (selectable) of the TTL level
input signal. This signal can be used as the gated sweep sig-
nal source.
4
X-OUT terminal
(unused)
5
PHONE connector
Connector for an 8
Ω
earphone used for AM/FM demodu-
lated audio output
6
GPIB connector
Connector for an external controller cable
7
Exhaust vent
Used to vent excess heat buildup in the spectrum analyzer
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CAUTION: Do not block this vent
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