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Chapter 24, Connector, Key, and Knob Descriptions
Connector Descriptions
AUDIO IN
Two connectors are used to input audio signals to the AF Analyzer:
• HI is the main audio signal input connection.
• LO is used for the audio signal reference. Three choices are available using the AF AN-
ALYZER screen’s Audio In Lo field:
• Gnd connects the center pin through approximately 100Ω to chassis ground.
• Float is a floating input.
• 600 To Hi provides a 600Ω internal load to match an audio source with an output
impedance of 600Ω.
The measured level is the potential between the HI and LO center pins. The shells
of both connectors are at chassis ground.
Operating Considerations
Input impedance is switchable between 1 MΩ in parallel with 95pF, or 600Ω
floating.
This port is selected as the AF Analyzer’s input using the
AF Anl In field in the
TX TEST screen, DUPLEX TEST screen, AF ANALYZER screen, and various
encoder modes. This port is always the AF Analyzer’s input when the RX TEST
screen is displayed.
Signals input to the AF Analyzer are routed through different filters, amplifiers,
and detectors that affect the displayed measurement.
CAUTION: The maximum level between the HI and LO center pins is 42 V peak (approximately
30 Vrms). Exceeding this value can cause permanent instrument damage.
See Also
Chapter 5, "AF Analyzer Screen"
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