R&S M3SR 4100 Series, Operating Manual

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Operating Manual 6175.4760.02 – 01 6.3
M3SR Series 4100 Troubleshooting
6.2 Troubleshooting
6.2.1 Radio Built-In Test
The radio is equipped with a built-In test equipment (BITE), performing various selftests of
different depths. There are three different kinds of built-in tests implemented in the radio:
• Power-on built-in test (PBIT)
• Continuous built-in test (CBIT)
• Initiated built-in test (IBIT)
The power-on built-in test (PBIT) starts immediately and automatically when the radio is pow-
ered up, a continuous built-in test continuously monitors essential parameters during opera-
tion, and the initiated built-in test is started by the operator. Each of these built-in tests
generates error messages for failure diagnosis and entries in the error log (see Figure 6.5).
In addition, the built-in test covers external devices such as power amplifiers.
The BIT results are made available to the operator in different ways:
• By indication on the display of a connected control unit (message box) immediately after
the error has been detected.
• By means of GO LED (1) on the radio front panel and GO LED (2) on a connected control
unit (see Figure 6.2), which are both switched off in case of a FAULT status of the radio.
• By means of an error list in the control unit menu 'Radio Error List' (see sect. 3.4 Radio
Maintenance and Figure 6.5). The error list holding the last 256 events (start-ups, warn-
ings and errors) with description and time of occurrence to be looked up in menu 'Radio
Error Details' (see sect. 3.4 Radio Maintenance).