HP 8719ET Reference Manual page 110

Front/Rear Panel
Rear Panel Features and Connectors
15. LIMIT TEST. This outputs a TTL signal of the limit test results as
follows:
• Pass: TTL high
• Fail: TTL low
16. MEASURE RESTART. This allows the connection of an optional foot
switch. Using the foot switch will duplicate the key sequence
MEASURE RESTART
17. TEST SET INTERCONNECT. Not used in standard configuration.
18. BIAS INPUTS AND FUSES. These connectors bias devices connected to
port 1 and port 2. The fuses (1 A, 125 V) protect the port 1 and port 2 bias
lines.
19. Serial number plate. The serial number of the instrument is located on
this plate.
20. RF IN/OUT. (Option 085) This allows the connection of an optional
booster amplifier to increase the output power of the analyzer.
21. EXTERNAL MONITOR: VGA. VGA output connector provides analog
red, green, and blue video signals which can drive a VGA monitor.
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Meas