Test Set Operation
Subject to Export Control, see Cover Page for details.
3-11
AC Power Connector
The AC Power Connector accepts an IEC 320 connector. Refer to Appendix B, 3900 Platform
Specifications for the required supply voltage, frequency and power consumption specifications.
Also refer to the section titled Installation Requirements
in Chapter 2, Installation.
AC Power Fuse
Fuses are accessed from the rear panel by removing the fuse cover located above the AC Power
Refer to Appendix C, Fuse Replacement Instructions
, for complete fuse replacement instructions.
AC Power Supply Switch
The AC Power Supply Switch disconnects the 3900 from the AC power supply. When the Test
Set is to be left unused for extended period of time, power down the Test Set using the On/
Standby Key, then turn the AC Power Supply Switch to the OFF position. Refer to section titled
On/Standby Key
for additional information.
The AC Power Supply Switch should not be used for powering down the Test Set because all
settings and test results are lost. The On/Standby Key should be used for routine powering
down. The On/Standby Key
initiates the power-down procedure, ensuring all settings and test
results are saved.
Rear Cooling Outlets
Refer to the section titled Installation Requirements in Chapter 2 for ventilation requirements.
IF Output Signal Connector
The IF Output Signal is available at this BNC connector. The 10.7 MHz IF Output is the RF
signal received and down-converted by the Test Set RF Analyzer.
The output level is -10 dBm typical at 10.7 MHz (50 Ω nominal).
The 10.7 MHz IF OUT signal is spectrally inverted. An RF signal received by the Test Set,
down-converted to 10.7 MHz, then output on this socket has the property that a frequency
increase or a phase advance at RF is output as a frequency reduction or phase retardation at
IF. Take this into account if using this output for work with any type of FSK/PSK signaling.
Ext Ref I/O External Interface
The External Reference I/O Connector is a BNC connection used to connect the Test Set to an
external frequency standard, or to output the internal frequency standard from the Test Set to
other equipment. Refer to 3900 Platform Specifications for Input/Output specifications.
Audio Input Connector
The auxiliary I/O Audio Connector is internally connected and ready for future development. Do
not make any external connection to this connector.
External Trigger Signal Input Connector
The External Trigger Signal Input is the external trigger input for the Oscilloscope.
This BNC connection has an Input impedance 10 kΩ. Refer to the Oscilloscope specifications in
the 3900 Platform Specifications for details of the required signal.
Audio Output Connector
This auxiliary I/O Audio Connector is internally connected and ready for future development. Do
not make any external connection to this connector.
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