CMU Manual Test Procedure
1100.4903.82 1.7 E–4
Manual Test Procedure
Some additional measurements can only be performed using a mobile phone via the normal operating
menus of the CMU. These measurements are described in the section ’Function Test with Mobile
Stations'.
The suggested frequencies and levels at which the measurements should be performed have been
selected according to the instrument concept. The user can of course also select other frequencies and
levels within the scope of values guaranteed in the data sheet.
Note: Before testing the rated specifications, allow the instrument to warm up for at least 15 min.
The ambient temperature should be 23 °C to 26 °C.
Selftest
The CMU offers various selftest options for checking the functioning and for troubleshooting. Before
carrying out the performance test, the Maintanance menu in the BASE function group should be called
up and the following selftests should be performed:
• Continuous Selftest
• 1Å4/3Å2 RF Loop Test
Preparation:
½ Start user SW of the CMU (switch on instrument).
Test: ½ Select the individual test in the BASE (MAINTENANCE) menu and check the results
(Continuous Selftest, 1Ã…4/3Ã…2 RF Loop Test).
Note: The Continuous Selftest combines the System Selftest and Internal RF Loop Selftest. In
this test, only a passed/failed message with error output is indicated. In case of errors, an
error file ‘cst.err’ is created in addition.
1Ã…4/3Ã…2 RF Loop Test: Selftest RF Path RF1Ã…RF4 IN and RF3 OUTÃ…RF2 via external
N-coax cable by power measurements via internal generator and analyzer. In this test, all
measured values are indicated.
To obtain more detailed information start the following tests:
System selftest:
Selftest of the instrument for diagnostic voltages; only a
passed/failed message with error output is indicated.
Internal RF Loop Selftest:
Selftest of the RF path by means of power measurements
via internal generator and analyzer. All measured values
are indicated.
FE Selftest:
Selftest of the RF FRONTEND module via diagnostic
voltages. All measured values are indicated.
REF Selftest:
Selftest of the REFERENCE BOARD module via diagnostic
voltages. All measured values are indicated.
DIG Selftest:
Selftest of the DIGITAL BOARD module via diagnostic
voltages. All measured values are indicated
RXTX1 Selftest:
Selftest of the RXTX1 BOARD module via diagnostic
voltages. All measured values are indicated.
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