Basic Instrument Functions
R&S
®
CMW500
105User Manual 1173.9463.02 ─ 02
5.3.5.4 Performing Selftests
Selftests are controlled like any other measurement. The following example shows an
"RF Loop Test" which is appropriate for a general check of the RF path.
RF Loop Test
The "RF Loop Test" is a special unit test that measures the RF path from a TRX module
to a frontend connector and back using an additional BB measurement module.
To perform the overall loop test at RF 1 COM:
1. Press the SETUP key and select "Maintenance - Selftest" from the "Setup" dialog.
The "Selftest" dialog is opened.
2. Select "Repetition Mode: Single-Shot" to perform the test only once.
3. Click the "Disable all" hotkey to clear the predefined selftest selection.
4. Open the "Unit Test > RF Loop Test > BB800 TRX 600, RF 1 COM" section and select
the RF frequencies you want to measure. Each frequency is measured at different
RF output levels.
5. Press the "ON | OFF" key to start the selftest.
The LEDs at the RF 1 COM connector light to indicate that an output/input signal is
applied. After the selftest is completed, the result at each frequency is shown in the "State"
column. The measured levels should be approx. 6 dB above the RF output levels.
5.3.5.5 Selftest Parameters
The "Selftest" dialog provides the following controls and dialogs.
● Selftest Control Softkeys.......................................................................................105
● Selftest Configuration............................................................................................106
Selftest Control Softkeys
The selftest is turned on or off using the ON | OFF or RESTART | STOP keys; see
Measurement Control. The measurement control softkey shows the current measure-
ment state.
Setup Dialog
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