Rohde & Schwarz CMU 200 Service Manual

Troubleshooting R&S CMU
1100.4903.82 3.76 E-5
Troubleshooting using the SELFTEST Menu for Modules
The SELFTEST menu indicate the diagnostic voltages for the individual modules of which the modules
settings are exactly defined. Thus, a specific selftest of the respective module is possible.
This menu additionally features internal RF power measurements which are designed as RF loop with
internal generator and analyzer. This is why a simple RF path is possible.
The selftest menu can be called up via the MENU SELECT key on the front panel of the R&S CMU.
Call the selection BASE via the spinwheel in the MENU SELECT and confirm with ENTER.
The respective selftest can be selected via the softkey SELECT and the spinwheel.
The following selftests are available:
• Continuous Selftest
1
• Internal RF Loop Selftest
• System Selftest
• FE Selftest
• REF Selftest
• DIG Selftest
• RXTX1 Selftest
• 1 4/3 2 RF Loop
(Continous selftest via System Selftest and Internal RF Loop Selftest,
passed/failed with error output is only indicated; additionally in case of
errors, it is created an error file 'cst.err'
2
)
(Selftest RF path by power measurements via internal generator and
analyzer, in this case all measured values are indicated.)
(Selftest instrument for diagnostic voltages, passed/failed with error
output is only indicated.)
(Selftest Module RF FRONTEND for diagnostic voltages, in this case
all measured values are indicated.)
(Selftest Module REFERENCE BOARD for diagnostic voltages, in this
case all measured values are indicated.)
(Selftest Module DIGITAL BOARD for diagnostic voltages, in this case
all measured values are indicated.)
(Selftest Module RXTX1 BOARD for diagnostic voltages, in this case
all measured values are indicated.)
Selftest RF Path RF1RF4IN and RF3OUTRF2 via external
N-coax cable by power measurements via internal generator and
analyser, in this case all measured values are indicated.
1
perform the test with open connectors at RF1 and RF2
2
Note: You can read the error file 'cst.err' as follows:
- Connect the external keyboard connector to the rear panel of the CMU.
- Switch on the CMU and wait until the CMU is booted.
- Start the Continuous Selftest (only when errors have occurred, the file 'cst.err' is created. Don't finish the Continuous Selftest with OFF, otherwise the 'cst.err' file will be
deleted.)
- Press the keys ALT and F4 of the external keyboard to get to the DOS mode.
- Goto directory: c:\internal\log
- Read the file with the DOS editor: 'edit cst.err'
- Quit the DOS editor and start CMU operating software with: 'cmu.bat'.

Rohde & Schwarz CMU 200 Specifications

General

Brand	Rohde & Schwarz
Model	CMU 200
Category	Test Equipment
Language	English