Rohde & Schwarz M3SR Series 4100, Service Manual, Page: 80 / 138

R&S M3SR Series 4100 HF Transceivers Function Test with Built-in Tests
6124.9007.82.01 3.4
NOTE:
If warnings and/or error messages are being displayed during the built-in tests, perform
troubleshooting according to 4 - Troubleshooting.
1.2 Switch on the transceiver.
NOTE:
The transceiver now performs the power-on built-in test. In
case of trouble, warnings and/or error messages are
generated, which are important for troubleshooting. They
are indicated later on the display of the external control unit.
Please note that for running the PBIT a coldstart is required.
So when powering the unit down and then up again allow a
break of at least 7 seconds.
LED GO is illuminated
LED AC/DC is illuminated
No error messages are dis-
played
2 IBIT (Initiated Built-in Test)
2.1 IBIT can only be started via a R&S GB 4000C Comfort Con-
trol Unit. IBIT is a comprehensive test on different Rx and Tx
frequencies. IBIT is started explicitly by softkey actuation in
Menu 3001 Radio MTC 1/6 on the user interface of
R&S GB 4000C (see Operating Manual). It may be aborted
any time and started anew whenever appropriate.
During IBIT, the transmit and receive paths are checked au-
tomatically. All LEDs are tested.
NOTE:
Perform IBIT only under the following conditions:
Radio operation mode: FIXED FREQUENCY
Communication mode: V/D UNCP (voice/data
unciphered)
Signals Tx Inhibit and Rx Inhibit are not allowed to be
LOW-active at the external interfaces. If these
requirements are not met, an error message may come
up when the IBIT is started. Once IBIT is completed,
reset the transceiver (RESET button).
LED GO is illuminated
No error messages are dis-
played
3 CBIT (Continuous Built-in Test)
3.1 CBIT is performed continuously as soon as the equipment
has entered a communication mode. Test results of CBIT
(Error, Warning, Info) are indicated by LED GO and are also
shown in a message box coming up on the display of the
R&S GB 4000C. LED GO is illuminated
No error result
4 Switch off the transceiver and test equipment.
No. Activity Nominal Value