Test and Measurement
Division
Service Manual Instrument
Universal Radio Communication
Tester
CMU200/CMU300
Printed in the Federal
Republic of Germany
1100.0008.02/1100.0008.03
1100.4903.82-04- 1
CMU Tabbed Divider Overview
Tabbed Divider Overview
Spare Parts Express Service
List of R&S Representatives
Safety Instructions
Contents
Contents of Manuals for Universal Radio Communication Tester CMU
Tabbed Divider
1 Chapter 1: Performance Test
Index
2 Chapter 2: Adjustment
3 Chapter 3: Repair
4 Chapter 4: Software Update /Installation of Options
5 Chapter 5: Documents
1100.4903.82 RE E-3
Spare Parts Express Service
Phone: +49 89 4129 - 2465
Fax: +49 89 41
29 - 3306
E-mail: werner.breidling@RSD.rsd.de
In case of urgent spare parts requirements for this Rohde &
Schwarz unit, please contact our spare parts express
service.
Outside business hours, please leave us a message or
send a fax or e-mail. We shall contact you promptly.
1007.9016
CMU Contents
Contents
1 Performance Test................................................................................................1.1
General.............................................................................................................................................. 1.1
A) Calibration by an R&S Representative with an ACS Calibration System........ 1.1
B) Sending the Instrument to the Factory (Memmingen, Germany)..................... 1.1
Necessary Documents ............................................................................................................ 1.1
Measuring Instruments and Auxiliary Equipment........................................................................1.2
Test Setups ............................................................................................................................. 1.3
Reference Frequencies.................................................................................................1.3
TX Level Measurements ............................................................................................... 1.3
General TX measurements...........................................................................................1.4
RX Level measurements...............................................................................................1.4
General RX Measurements........................................................................................... 1.5
RX Demodulation Measurements................................................................................. 1.5
Tolerance Analysis .......................................................................................................................... 1.6
Manual Test Procedure ...................................................................................................................1.7
Selftest.....................................................................................................................................1.7
Interface Test...........................................................................................................................1.8
IEC-bus Interface .......................................................................................................... 1.8
RS–232 Interface .......................................................................................................... 1.8
Reference Frequencies ...........................................................................................................1.8
REF IN ......................................................................................................................... 1.8
REF OUT 1.................................................................................................................... 1.9
REF OUT 2.................................................................................................................... 1.9
TX Frequency Accuracy ........................................................................................................1.10
TX Frequency Settling Time.................................................................................................. 1.10
TX Level Error ....................................................................................................................... 1.10
VSWR....................................................................................................................................1.10
TX Level Settling Time ..........................................................................................................1.11
TX Harmonics........................................................................................................................ 1.11
TX Non Harmonics ................................................................................................................1.11
TX In-Band Spurious Signals ................................................................................................ 1.11
TX Fixed Spurious Signals ....................................................................................................1.12
TX SSB Phase Noise ............................................................................................................ 1.12
TX Residual FM..................................................................................................................... 1.12
TX Residual AM.....................................................................................................................1.12
TX Carrier/Sideband Suppression, Max. Distortion...............................................................1.13
RX Power Meter (Frequency-Selective)................................................................................ 1.13
1100.4903.82 3 E-4
Contents CMU
RX Power Meter (Wideband).................................................................................................1.13
RX Harmonics ....................................................................................................................... 1.13
RX Spurious Response / Image Rejection............................................................................1.14
RX SSB Phase Noise............................................................................................................ 1.14
RX Residual FM/AM.............................................................................................................. 1.15
RX Dynamic/ Average Noise Level........................................................................................ 1.15
Options for CMU200..............................................................................................................1.16
TX GSM Modulation....................................................................................................1.16
RX GSM Dem odulation.......................................................................................1.16
Function Test with Mobile Stations (CMU200) ......................................................................1.17
GSM mobile test.......................................................................................................... 1.17
CDMA mobile test ....................................................................................................... 1.17
IS136-mobile test ........................................................................................................ 1.17
AMPS-mobile test........................................................................................................1.17
Test Report.....................................................................................................................................1.18
2 Adjustment........................................................................................................... 2.1
Manual Adjustment..........................................................................................................................2.1
Measuring Instruments and Auxiliary Equipment.................................................................... 2.1
Preparing the Instrument......................................................................................................... 2.2
Adjusting the + 5 VDC Reference Voltage .............................................................................. 2.2
Adjusting the 10 MHz Reference Frequency........................................................................... 2.3
TCXO 2.3
OCXO REFERENCE OSC. CMU-B11..........................................................................2.3
OCXO REFERENCE OSC. CMU-B12..........................................................................2.3
Automatic Adjustment of Module Data.......................................................................................... 2.4
Preparing the adjustment ........................................................................................................2.4
Performing the adjustment ......................................................................................................2.4
3 Repair...................................................................................................................3.1
Instrument Design and Function Description............................................................................... 3.1
Block diagram..........................................................................................................................3.2
Instrument Frame ....................................................................................................................3.3
Rear of Instrument Frame ....................................................................................................... 3.3
Front of Instrument Frame.......................................................................................................3.3
Cooling the Instrument ............................................................................................................ 3.4
FRONT MODULE....................................................................................................................3.5
POWER SUPPLY....................................................................................................................3.6
MOTHERBOARD ....................................................................................................................3.7
REFERENCE BOARD.............................................................................................................3.8
1100.4903.82 4 E-4
CMU Contents
Option OCXO REFERENCE OSC. CMU-B11 or B12.............................................................3.9
RF FRONTEND....................................................................................................................... 3.9
RXTX BOARD1 .....................................................................................................................3.10
DIGITAL BOARD...................................................................................................................3.12
Option UNIVERSAL SIGNALLING UNIT CMU-B21.............................................................. 3.13
Option AUDIO-GEN. + ANA. CMU-B41 ................................................................................3.15
Option CDMA (IS95) Signalling Unit CMU-B81.....................................................................3.16
MODULE Replacement.................................................................................................................. 3.17
Replacing the FRONT MODULE........................................................................................... 3.17
Opening the instrument and removing the FRONT MODULE .......................3.17
Installing the new FRONT MODULE and completing the instrument............. 3.18
Putting into operation...................................................................................... 3.18
Replacing the FRONT MODULE CONTROLLER in the FRONT MODULE .........................3.19
Opening the instrument and removing the FRONT MODULE .......................3.19
Removing the FRONT MODULE CONTROLLER from the FRONT MODULE3.20
Installing the new FRONT MODULE CONTROLLER ....................................3.20
Installing the option again and completing the instruments............................3.20
Putting into operation...................................................................................... 3.21
Replacing the Lithium Battery in the FRONT MODULE........................................................ 3.22
Opening the instrument and removing the FRONT MODULE .......................3.22
Removing the lithium battery..........................................................................3.23
Installing the new battery and completing the instrument...............................3.24
Putting into operation...................................................................................... 3.24
Replacing the Hard Disk in the FRONT MODULE................................................................3.25
Opening the instrument and removing the FRONT MODULE .......................3.25
Removing the hard disk from the FRONT MODULE ..................................... 3.26
Installing the new hard disk ............................................................................3.26
Putting into operation...................................................................................... 3.27
Replacing the Memory Modules in the FRONT MODULE .................................................... 3.28
Opening the instrument and removing the FRONT MODULE .......................3.28
Making the memory modules accessible .......................................................3.29
Removing the memory module ......................................................................3.29
Installing the new memory module and completing the instrument................3.29
Putting into operation...................................................................................... 3.29
Replacing the LCD and/or DC/AC Converter in the FRONT MODULE................................. 3.30
Opening the instrument and removing the FRONT MODULE .......................3.30
Making the LCD accessible............................................................................3.31
Removing the LCD and/or DC/AC Converter.................................................3.31
Installing the new LCD and/or DC/AC converter and completing the instrument3.31
Putting into operation...................................................................................... 3.31
Replacing the Keyboard Membrane and/or Mat on the FRONT MODULE........................... 3.32
Opening the instrument and removing the FRONT MODULE .......................3.32
Removing the membrane............................................................................... 3.33
Installing the new membrane and completing the instrument ........................3.33
Putting into operation...................................................................................... 3.33
Replacing the Labeling Panel on the FRONT MODULE....................................................... 3.34
Removing the old labeling panel..................................................................... 3.34
Installing the new labeling panel and completing the instrument ...................3.34
Putting into operation...................................................................................... 3.34
Replacing the Options FLOPPY DISK DRIVE CMU-B61 or PCMCIA INTERFACE .............3.35
1100.4903.82 5 E-4
Contents CMU
Opening the instrument and removing the FRONT MODULE .......................3.35
Replacing the option....................................................................................... 3.36
Completing the instrument and putting into operation.................................... 3.36
Replacing the RF FRONTEND.............................................................................................. 3.37
Opening the instrument and removing the RF FRONTEND ..........................3.37
Installing the new RF FRONTEND MODULE and completing the instrument3.37
Automatic module data adjustment................................................................3.37
Replacing the REFERENCE BOARD....................................................................................3.38
Opening the instrument and removing the REFERENCE BOARD ................ 3.38
Installing the new REFERENCE BOARD and completing the instrument......3.38
Automatic module data adjustment................................................................3.38
Replacing the RXTX BOARD1 ..............................................................................................3.39
Opening the instrument and removing the RXTX BOARD1........................... 3.39
Installing the new RXTX BOARD1 and completing the instrument................ 3.39
Automatic module data adjustment................................................................3.39
Replacing the TR-CORRECTION MODULE in the RXTX BOARD1..................................... 3.40
Opening the instrument and removing the TR-CORRECTION MODULE .....3.40
Installing the new TR-CORRECTION BOARD and completing the instr. ...... 3.40
Automatic module data adjustment................................................................3.40
Replacing the DIGITAL BOARD............................................................................................ 3.41
Opening the instrument and removing the DIGITAL BOARD ........................ 3.41
Installing the new DIGITAL BOARD and completing the instrument..............3.41
Automatic module data adjustment................................................................3.41
Replacing the MODULES: ADC MODULE1, DDC MODULE1, TXDSP MODULE1, AUC
MODULE1 in the DIGITAL BOARD.......................................................................................3.42
Opening the instrument and removing the modules....................................... 3.42
Installing the new sandwich module and completing the instrument..............3.42
Automatic module data adjustment................................................................3.43
Replacing the Option OCXO REFERENCE OSC. CMU-B11 or CMU-B12...........................3.44
Opening the instrument and removing the OPTION OCXO REF. OSC......... 3.44
Installing the new OPTION OCXO REFERENCE OSC. and completing the
instrument..................................................................................... 3.44
Manual OCXO adjustment .............................................................................3.44
Replacing the Option UNIVERSAL SIGNALLING UNIT CMU-B21....................................... 3.45
Opening the instrument and removing the OPTION UNIV. SIGN. UNIT .......3.45
Installing the new OPTION UNIV. SIGN. UNIT and completing the instr....... 3.45
Automatic module data adjustment................................................................3.45
Replacing the MODULES: DSP MODULE0/1, IQOUT MODULE, OPTION SPEECH CODEC
CMU-B52 (INCLUDES DSP MODULE3) in the UNIV. SIGN. UNIT...................................... 3.46
Opening the instrument and removing the modules....................................... 3.46
Installing the new sandwich module and completing the instrument..............3.46
Automatic module data adjustment................................................................3.47
Replacing the Option AUDIO-GEN. + ANA. CMU-B41 ......................................................... 3.48
Opening the instrument and removing the Option AUDIO-GEN. + ANA........ 3.48
Installing the new Option AUDIO-GEN. + ANA. and completing the instr......3.48
Automatic module data adjustment................................................................3.48
Replacing the POWER SUPPLY...........................................................................................3.49
Removing the POWER SUPPLY ...................................................................3.49
Installing the new POWER SUPPLY.............................................................. 3.49
Replacing the Instrument Fan ............................................................................................... 3.50
Opening the instrument and removing the fan ............................................... 3.50
Installing the new fan and completing the instrument.....................................3.50
1100.4903.82 6 E-4
CMU Tables
Replacing the MOTHERBOARD ...........................................................................................3.51
MOTHERBOARD1 (big MOTHERBOARD)................................................................ 3.51
Opening the instrument and removing MOTHERBOARD1............................ 3.51
Installing the new MOTHERBOARD1 and completing the instrument........... 3.51
MOTHERBOARD2 (small MOTHERBOARD)............................................................. 3.52
Opening the instrument and removing MOTHERBOARD2............................ 3.52
Installing the new MOTHERBOARD2 and completing the instrument........... 3.52
FRONTPANEL BOARD (at the front of the instrument frame) ...................................3.52
Opening the instrument and removing the FRONTPANEL BOARD ..............3.52
Installing the new FRONTPANEL BOARD and completing the instrument ... 3.52
REARPANEL BOARD1 (Interface board for Standard Connectors at the Rear of the
Instrument Frame)....................................................................................................... 3.53
Opening the instrument and removing the REARPANEL BOARD1............... 3.53
Installing the new REARPANEL BOARD1 and completing the instrument.... 3.53
REARPANEL BOARD2 (Interface Board for Further Connectors at the Rear of the
Instrument Frame)....................................................................................................... 3.53
Opening the Instrument and removing the REARPANEL BOARD2 .............. 3.53
Installing the new REARPANEL BOARD2 and completing the instrument.... 3.53
Troubleshooting ............................................................................................................................ 3.54
Troubleshooting using the LEDs (H1 to H8) on the MOTHERBOARD .................................3.55
Troubleshooting using the SELFTEST Menu for Modules.................................................... 3.57
Troubleshooting using the INFO Menu for Modules..............................................................3.58
Troubleshooting using the ERROR messages on the LC display......................................... 3.60
More troubleshooting.............................................................................................................3.61
General errors on the transmitter side of the CMU ............................................................... 3.61
General errors on the receiver side of the CMU....................................................................3.62
4 Software Update/Installing Options...................................................................4.1
New Installation of the CMU Software........................................................................................... 4.1
Software Update via PCMCIA INTERFACE............................................................................ 4.1
Software Update via FLOPPY DISK DRIVE............................................................................4.1
Performing a Software Update ................................................................................................4.2
Reinstalling the Old Software......................................................................................................... 4.3
Loading Software as long as there is no VersionManager in the CMU...................................... 4.3
Installing the Options...................................................................................................................... 4.4
5 Documents........................................................................................................... 5.1
Module and Cable Exchange.......................................................................................................... 5.1
1100.4903.82 7 E-4
Tables CMU
Tables
Table 1-1 Measuring instruments and auxiliary equipment for manual performance test.....................1.2
Table 1-2 Test report ...........................................................................................................................1.18
Table 2-1 Measuring instruments and auxiliary equipment for manual adjustment of the CMU ........... 2.1
Table 5-1 List of power cables available................................................................................................ 5.2
1100.4903.82 8 E-4
CMU Manuals
Contents of Manuals for Universal Radio Communication Tester CMU200/CMU300
Service Manual Instrument
This service manual for Universal Radio Communication Tester CMU provides information on
checking the generator for compliance with rated specific ations, as well as on adj ustm ent, repair and
troubleshooting. It further contains all the information neces sary for repairing the gener ator by the replacement of modules.
The service manual compris es five chapters and an annex (chapter 5) containing the CMU circuit doc umentation:
Chapter 1 Provides all the information necessar y to c heck CMU for compliance with rated
specifications. The required test equipment is included, too.
Chapter 2 Describes the adjustment of the +5 VDC reference source and of the 10-MHz
reference frequency source as well as the software- controlled adjustm ent of individual module data following module replacement.
Chapter 3 Describes the design of CMU as well as simple measures for repair and fault
diagnosis, in particular, the replacem ent of m odules and ac cess to hardware s ettings by means of service commands.
Chapter 4 Contains information on the extension and modification of CMU by installing
instrument software and retrofitting options.
Chapter 5 Contains spare parts lists and exploded views of CMU.
Operating Manual
In the operating manual for CMU basic unit you will find information about the technical specif ic ations
of CMU, the controls and connectors on the f ront and rear panel, necess ary steps for putting the instrument into operation, the basic operating concept, manual and remote control.
For introduction typical measurem ent tasks are explained in detail us ing the f unctions of the user interface and program examples.
The operating manual contains all information on the charac teristic s, operation and r em ote control of
the CMU including RF and Audio measurements. It f urther provides hints on preventive m aintenance
and fault diagnosis by means of warnings and error messages output by the unit.
Service Manual Modules
The service manual modules is not delivered with the instrument but may be obtained from your R&S
service department using the order number 1100.4903.92.
Service manual modules contains inform ation about the individual modules of CMU. This com prises
the test and adjustment of the m odules, f ault detection within the modules and the inter face desc ription.
1100.4903.82 0.1 E-4
CMU Documentation
Operating Manuals for Digital and Analog Network Tests
The operating manuals listed in the f ollowing table describe the test of mobile phones supporting
different standards by means of the CMU200/CMU300 and the appropriate software and hardware
options. Except for hardware-spec ific chapters that ar e not relevant to the software options, the network test operating manuals are organized like the CMU operating manual.
For Options
Manual Order Number Type Description Stock No.
Operating Manual
CMU-K21/-K22/-K23
Operating Manual
CMU-K27/-K28
Operating Manual
CMU-K29
Operating Manual
CMU-K30/-K31/K32/-K33
Operating Manual
CMU-K81/-K82
Operating Manual
CMU-K53
1115.6088.12 CMU-K21
CMU-K22
CMU-K23
1115.6688.12 CMU-K27
CMU-K28
1115.6888.12 CMU-K29 AMPS-MS for CMU-B21 1115.6807.02
1115.4185.12 CMU-K30
CMU-K31
CMU-K32
CMU-K33
CMU-K39
CMU-K41
1115.5581.12 CMU-K81
CMU-K82
1115.5081.12 CMU-K53 Bluetooth for CMU 1115.5000.02
GSM900-MS for CMU-B21
GSM1800-MS for CMU-B21
GSM1900-MS for CMU-B21
TDMA800-MS for CMU-B21
TDMA1900-MS for CMU-B21
GSM400-BS for CMU-B21
GSM900-BS for CMU-B21
GSM1800-BS for CMU-B21
GSM1900-BS for CMU-B21
MOC/MTC
EDGE for CMU-K30/31/32/33
CDMA800-MS (IS95) for CMU-B81
CDMA1900-MS (IS95) for CMU-B81
1115.6007.02
1115.6107.02
1115.6207.02
1115.6607.02
1115.6707.02
1115.4004.02
1115.4104.02
1115.4104.02
1115.4104.02
1115.4791.02
1115.4604.02
1115.5500.02
1115.5600.02
The GSM base station tests described in operating manual CMU-K30/-K31/-K32 r equire a CMU300
(Universal Radio Comm unic ation Tester for BT S). All other r adio c ommunication equipment is tested
with model CMU200.
1100.4903.82 0.2 E-4
CMU General
1 Performance Test
This chapter provides the necessary information for checking the technical data of the CMU. Please
read the general notes on the test procedure on page 1.7 first. Then follows a list of the measuring
equipment required for the perf ormance test; a f orm for the tes t report is to be f ound at the end of this
chapter.
The adjustment of the instrument f or restoring the data integrity and the measuring equipment r equired
for this purpose will be described in chapter 2 of this service manual.
General
The technical data of a CMU can be checked in the following ways:
A) Calibration by an R&S Representative with an ACS Calibration System
Advantages
• Automatic procedure
• Small measurement uncertainties
• Calibration and readjustment
• In most cases, the instrument does not have to leave the country
B) Sending the Instrument to the Factory (Memmingen, Germany)
Advantages
• Automatic procedure at the final test setup
• Minimum measurement uncertainties
• Calibration and readjustment
Necessary Documents
• Operating manual CMU200/CMU300
• Data sheet CMU200
Note: It is recommended to read the following journal on the s ubjects "meas urement uncertainty "
and "tolerance analysis": ETSI Technical Report ETR 028, June 1997
1100.4903.82 1.1 E–4
Measuring Instruments and Auxiliary Equipment CMU
Measuring Instruments and Auxiliary Equipment
Table 1-1 Measuring instruments and auxiliary equipment for manual performance test
Item Type of instrument Required characteristics Appropriate device R & S order
1 Signal generator 100 kHz to 2.7 GHz,
2 Spectrum analyzer 100 kHz to 7 GHz,
3 Power meter NRVD with sensors
4 Power amplifier 100 kHz to 2.7 GHz,
5 Harmonics filter attenuate the harmonics of the
6 Directional coupler 50 MHz to 2.7 GHz,
7 Network analyzer
or VSWR Bridge
Generation of a GSM signal
(dummy burst)
Demodulation of GSM signals
Pout = 100 W
power amplifiers to min 30 dBc
up to 100 W
100 kHz to 2.7 GHz ZVR
SME03
SMIQ
FSE with FSE-B7
FSIQ
FSP–3
NRV-Z4
NRV-Z51
ZRC
number
1038.6002.03 RX measurements
1066.30.10.20
1066.30.10.30
1066.4317.02
1093.4495.03
1043.0009.61 Reflection coefficient/
Use
TX measurements
RX measurements,
TX measurements
RX measurements
RX measurements
RX measurements
VSWR
RF connectors
1100.4903.82 1.2 E–4
CMU Measuring Instruments and Auxiliary Equipment
Test Setups
The quality of the test setup has an effect on the measurement procedures.
Note: Make sure to use only high-quality coax cables and coax connectors as well as calibrated
measuring equipment.
Reference Frequencies
Test setup REF1:
REF1
Spectrum
Analyzer
(FSE
or
FSIQ)
GEN
REFIN
DUT
(CMU)
10 MHz Reference Freq.
RF3 OUT
Test setup REF2:
REF2
Spectrum
Analyzer
(FSE or
FSIQ)
DUT
(CMU)
REF IN
REF OUT 2
10 MHz Reference Freq.
TX Level Measurements
Test setup TX1, TX2, TX3, TX4 (depending on level range):
½ Normalize spectrum analyzer (FSIQ) to wideband power meter (NRVD) at Max. Level setting of the
CMU (test setups TX1, TX2, TX3).
The attenuator of the spectrum analyzer must be held at this position over 60 dB.
½ Normalize spectrum analyzer with preamplifier to spectrum analyzer at last level (test setups TX 3,
TX4).
The attenuator of the spectrum analyzer must be held at this position over 60 dB.
TX1
DUT
(CMU)
.. +5 dBm
RF3OUT
NRV-Z51
NRVD
1100.4903.82 1.3 E–4
Measuring Instruments and Auxiliary Equipment CMU
TX2
-33 dBm/
DUT
(CMU)
TX3
DUT
(CMU)
TX4
-16 dBm
RF1 /
RF2
-93 dBm to -33 dBm/
-76 dBm to -16 dBm/
-55 dBm to +5 dBm
RF1 /
RF2 /
RF3 OUT
10 MHz Reference Freq.
NRV-Z4
FSIQ or FSE
NRVD
-130 dBm to -93 dBm/
-117 dBm to -76 dBm/
DUT
(CMU)
-90 dBm to -55 dBm
RF1/
RF2/
RF3 OUT
10 MHz Reference Freq.
General TX measurements
Test setup TX5:
TX5
AUX3, pin2
DUT
(CMU)
RF1, RF2, RF3
10 MHz Reference Freq.
RF-PreAmp
36 dB
FSE
or FSIQ
ext. Trigger input
Spectrum
analyzer
(FSE or
FSIQ)
RX Level measurements
Test setup RX1, RX2 (depending on level range):
1100.4903.82 1.4 E–4
CMU Measuring Instruments and Auxiliary Equipment
RX1
RX2
GEN
GEN
Power
Ampl.
LPF
depending on max.
level of power splitter
Power
Ampl.
LPF
Power
Splitter
direc t . co upl
-30 dB
NRVZ4
NRV-
Z4
NRVD
DUT
(CMU)
NRVD
DUT
(CMU)
General RX Measurements
Test setup RX3:
RX3
GEN
RF1,RF2,RF4IN
10 MHz Reference Freq.
RX Demodulation Measurements
Test setup RX4:
RX4
GEN
RF4IN
DUT
(CMU)
DUT
(CMU)
IF3RX CH1
Demodulator
(FSE with
FSE-B7 or
FSIQ)
10 MHz Reference Freq.
10 MHz Reference Freq.
1100.4903.82 1.5 E–4
Tolerance Analysis CMU
Tolerance Analysis
Due to the small measur ement uncertainty of the CMU, the measuring equipm ent must m eet stringent
requirements. Since the measur ement uncer tainty of the measuring equipm ent to be achieved depends
on the test setup used, it is recommended to perform a tolerance analysis.
To be able to trace back errors in the measurement, the measurement uncertainty should also be
indicated in the test report.
The tolerances given in the test report refer to the values specified in the data sheet, ie the
measurement uncertainties of the test setup used are to be taken into account as well.
Unless otherwise specified, the specified tolerances are always to be observed.
Note: Please take into account the ETSI Technical Report ETR 028.
The given tolerances refer to CMU data sheet 04/99.
1100.4903.82 1.6 E–4
CMU Manual Test Procedure
Manual Test Procedure
Some additional measurem ents can only be performed us ing 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 cour se 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 m enu in the BASE function gr oup should be called
up and the following selftests should be performed:
• Continuous Selftest
• 1Å4/3Å2 RF Loop Test
Preparation:
Test: ½ Select the individual test in the BASE (MAINTENANCE) menu and chec k the res ults
Note: The Continuous Selftest combines the System Self test and Internal RF Loop Selftest. In
½ Start user SW of the CMU (switch on instrument).
(Continuous Selftest, 1Å4/3Å2 RF Loop Test).
this test, only a passed/failed message with error output is indicated. In case of err ors, an
error file ‘cst.err’ is created in addition.
1Å4/3Å2 RF Loop Test: Selftest RF Path RF 1ÅRF4 IN and RF3 OUTÅRF2 via external
N-coax cable by power measurements via internal generator and analyzer. In this tes t, all
measured values are indicated.
To obtain more detailed information start the following tests:
System selftest:
Internal RF Loop Selftest:
FE Selftest:
REF Selftest:
Selftest of the instrument for diagnostic voltages; only a
passed/failed message with error output is indicated.
Selftest of the RF path by means of power measur ements
via internal generator and analyzer. All measured values
are indicated.
Selftest of the RF FRONTEND module via diagnostic
voltages. All measured values are indicated.
Selftest of the REFERENCE BOARD module via diagnostic
voltages. All measured values are indicated.
DIG Selftest:
RXTX1 Selftest:
1100.4903.82 1.7 E–4
Selftest of the DIGITAL BOARD module via diagnostic
voltages. All measured values are indicated
Selftest of the RXTX1 BOARD module via diagnostic
voltages. All measured values are indicated.
Manual Test Procedure CMU
Interface Test
IEC-bus Interface
Preparation:
Test: ½ Send the string ‘*IDN?<CR><NL>’ from the controller to the CMU and read the
½ Connect the IEC-bus interfaces of the CMU and the controller via IEC-bus
cables.
reply STRING of the CMU.
The reply STRING must contain the following message:
‘ROHDE & SCHWARZ,CMU<Var>,<Ser_Nr>,<Firmware_Vers._Nr>’
RS–232 Interface
Preparation:
Test: ½ Send the string ‘*IDN?<CR><NL>’ from the controller to the CMU and read the
½ Connect the RS–232 interfaces of the CMU and the controller via null-modem
cables (cf. page 5.1.1, "Measuring Instruments and Auxiliary Equipment").
Set the RS–232 interface of the controller to 8 data bits, 1 s tart bit, 1 stop bit, no
parity bit, XON/XOFF handshake and 19200 baud.
reply string of the CMU.
The reply string must contain the following message:
‘ROHDE & SCHWARZ,CMU<Var>,<Ser_Nr>,<Firmware_Vers._No>’
Reference Frequencies
For different range of adjustm ent of the internal r ef er enc e osc illator , the synchronization with an external
reference frequency is checked.
Note: The resolution of the frequency counter/analyzer should be max. 1/10 of the maximum
permissible deviation.
REF IN
The frequency and level ranges and the pull-in range are checked. The signal generator and the
frequency counter must be synchronized (test setup REF1).
Preparation:
Control: Set CMU to external reference 52 MHz, RF 1 GHz (menu RF ANALYZER/
Test: Use frequency counter to measure frequency deviation from 1 GHz.
½ Feed in at REF IN: 52 MHz sinewave, 0.5 V(rms)
½ Connect frequency counter to RF3 OUT.
GENERATOR.)
1100.4903.82 1.8 E–4
CMU Manual Test Procedure
Preparation:
Control: ½ Set CMU to external reference 1 MHz, RF 1 GHz.
Test: ½ Use frequency counter to measure frequency deviation from 1 GHz.
Preparation:
Control: ½ Set CMU to external reference 10 MHz, RF 1 GHz.
Test: ½ Use frequency counter to measure frequency deviation from 1.000 005 000 GHz.
Preparation:
Control: ½ Set CMU to external reference 10 MHz, RF 1 GHz.
Test: ½ Use frequency counter to measure frequency deviation from 0.999 995 GHz.
½ Feed in at REF IN: 1 MHz sinewave, 0.5 V(rms).
½ Connect frequency counter to RF3 OUT.
½ Feed in at REF IN: 10.000 050 MHz sinewave, 1.4 V(rms).
½ Connect frequency counter to RF3 OUT.
½ Feed in at REF IN: 9.999 950 MHz sinewave, 1.4 V(rms).
½ Connect frequency counter to RF3 OUT.
REF OUT 1
The level and frequency are checked.
Int. 10 MHz:
REF IN
signal:
½ Set CMU to internal reference.
½ Measure at REF OUT 1: 10 MHz, level > 1.4 V(pp).
½ Set CMU to external reference.
½ Feed in at REF IN: 52 MHz TTL, (as an alternative +16 dBm from signal)
½ Measure at REF OUT 1: 52 MHz, level > 1.4 V(pp).
½ Measure at REF OUT 1: frequency 52 MHz ± 1 Hz
½ Feed in at REF IN: 1 MHz TTL, (as an alternative +16 dBm from signal
generator).
½ Measure at REF OUT 1: 1 MHz, level > 0.5 V(rms) (1.4 V(pp)).
½ Measure at REF OUT 1: frequency 1 MHz ± 1 Hz.
REF OUT 2
The level and frequency are checked. T he CMU and the fr equency counter mu st be synchronized (test
setup REF2).
REF OUT 2
signal 13 MHz:
½ Set CMU to external reference.
½ Feed in at REF IN: 10 MHz sinewave, 0.5 V(rms).
½ Set CMU to REF OUT 2 13 MHz or 10 MHz (depending on SW; menu
Connection Control/Synch.).
½ Measure at REF OUT 2: 13 MHz or 10 MHz, level > 1.0 V(pp).
½ Measure at REF OUT 2: frequency 13 MHz or 10 MHz ± 1 Hz.
1100.4903.82 1.9 E–4
Manual Test Procedure CMU
TX Frequency Accuracy
Preparation: Test setup TX5, but CMU not synchronized with frequency counter/analyzer and
no external trigger.
CMU connector RF3 OUT.
Control: ½ Set CMU to desired frequency, level 0 dBm.
Test: ½ Determine frequency deviation from nominal frequency.
TX Frequency Settling Time
Preparation: Test setup TX5, in addition tr igger cable f rom CMU (D-s ub c onnector AUX3, pin2)
to analyzer.
CMU connector RF3 OUT.
CMU: Ramping off, hopping on, F1 = start freq., F2 = stop freq.
Analyzer: Sweep time 1 ms, Center = stop frequenc y, FM demodulation,
real time off, BW 50 kHz, 1 kHz/Div, external trigger, Slope
negative
Control: ½ Set CMU to desired frequencies and hopping, level 0 dBm.
Test: Time from trigger point when the specified offset (< 1 kHz) from the stop
frequency is reached.
TX Level Error
Preparation: Test setup TX1 to TX4 (depending on level range).
Control: ½ Set CMU to desired connector, frequency and level (RF Analyzer must be
OFF).
Test: ½ Measure the TX level of the CMU.
Note: The given frequencies and levels are suggested values. Of course, it is also possible to use
other values for the measurement.
VSWR
Preparation:
½ Connect (scalar ) network analyzer to RF1, RF2, RF3 OUT, RF4 IN one after
the other.
Cable losses must be corrected.
Control:
Test: ½ Measure VSWR at 10 MHz, 900 MHz, 1800 MHz, 2700 MHz.
1100.4903.82 1.10 E–4
CMU: Switch generator on and set level to minimum (–130 dBm or
–90 dBm), switch RF wideband analyzer on (RF1/RF2/RF4 IN).
CMU Manual Test Procedure
TX Level Settling Time
Preparation:
Control: ½ Set CMU to frequency = 1 GHz, specified level and ramping mode.
Test: ½ The time period fr om the trigger point to the point in time when the nominal
Test setup TX5, in addition tr igger cable f rom CMU (D-s ub connec tor AUX3, pin2)
to analyzer.
CMU: Connector RF3 OUT 1GHz, Ramping On, Hopping Off.
Analyzer: Sweep time = 40 µs, Center = 1 GHz , Span = 0, RBW = 10
MHz, external trigger.
level < 0.5 dB has been reached is measured.
TX Harmonics
Preparation: Test setup TX5, no external trigger
Analyzer: Center = 2 x f
Control: ½ Set CMU to connector RF1, specified frequency, level = –27 dBm.
Test: The suppression of the signal at twice or three times the nominal frequency is
measured relative to the nominal signal.
Control: ½ Set CMU to connector RF2, specified frequency, level = –10 dBm.
or Center = 3 x f
nom
, Span = 1 MHz.
nom
Test: The suppression of the signal at twice or three times the nominal frequency is
measured relative to the nominal signal.
Control: ½ Set CMU to connector RF3 OUT, specified frequency, level = +10 dBm.
Test: The suppression of the signal at twice and three times the nominal f requency is
measured relative to the nominal signal.
TX Non Harmonics
TX In-Band Spurious Signals
Spurious signals within the specified frequency bands are checked.
Preparation Test setup TX5, no external trigger
Analyzer Start/Stop = specified frequency range, RBW = 100 kHz
Control: ½ Set CMU to connector RF3 OUT, specified setting frequency, level = 0 dBm.
Test: The suppression of the signal is m easured at the tes t frequenc y relative to the set
signal.
1100.4903.82 1.11 E–4
Manual Test Procedure CMU
TX Fixed Spurious Signals
Fixed spurious signals are checked.
Preparation: Test setup TX5, no external trigger.
Analyzer: Center = specified test frequency, RBW = 100 kHz, Span = 1 MHz.
Control: ½ Set CMU to connector RF3 OUT, specified setting frequency, specified level.
Test: The suppression of the signal is m easured at the tes t frequenc y relative to the set
signal.
TX SSB Phase Noise
Preparation Test setup TX5, no external trigger
½ Connect spectrum analyzer or modulation analyzer to RF3 OUT.
Control: ½ Set CMU generator to specified RF frequency.
Output level at RF3 OUT 0 dBm,
Analyzer to specified center frequency,
Span = 50 kHz to 5 MHz, RBW = Span/500,
Noise measurement function.
Test ½ Measure the phase noise at the specified spacing from the carrier.
TX Residual FM
Preparation: Test setup TX5, no external trigger.
½ Connect spectrum analyzer or modulation analyzer to RF1.
Control: ½ Set CMU generator to the specified RF frequency.
Output level at RF1 –27 dBm, analyzer to specified center frequency, FM
demodulator.
Test: ½ The residual FM with the specified weighting is measured.
TX Residual AM
Preparation: Test setup TX5, no external trigger.
½ Connect spectrum analyzer or modulation analyzer to RF1.
Control: ½ Set CMU generator to specified RF frequency.
Output level at RF1 –27 dBm, analyzer to specified center frequency, AM
demodulator.
Test: ½ The residual AM with the specified weighting is measured.
1100.4903.82 1.12 E–4
CMU Manual Test Procedure
TX Carrier/Sideband Suppression, Max. Distorti on
The modulation quality of the analog IQ modulator of the CMU is measured.
Preparation Test setup TX5, no external trigger.
½ Connect spectrum analyzer to RF3 OUT.
Control: ½ Set CMU generator to specified RF frequency.
Output level at RF3 OUT, 0 dBm,
½ Switch on RF generator with offset modulation, 300- kHz baseband filter,
½ Set analyzer to center frequency f
= 1000 MHz, Span = 300 kHz / 3 MHz
c
Test: The suppression of the carrier at f
+ f
signal at f
.
c
mod
is measured relative to the useful sideband
c
RX Power Meter (Frequency-Selective)
Preparation: Test setup RX1, RX2 (depending on level range).
Control: ½ Set CMU to desired RX frequency and level and Input in menu RF
ANALYZER/ GENERATOR.
Measuring Bandwidth = 1 kHz.
Test: ½ Measure RX level measurement accuracy of CMU.
Note: The given frequencies and levels are s uggested v alues ; of c ours e, it is als o poss ible to us e
other values for the measurement.
RX Power Meter (Wideband)
Preparation Test setup RX1, RX2 (depending on level range).
Control: ½ Set CMU to desired RX connector, frequency and level and Input in menu RF
Analyzer/ Generator.
Measuring Bandwidth = Wide
Test: ½ Measure RX level measurement accuracy of CMU.
Note: T he given frequencies and levels are suggested values; of cours e, it is also possible to use
other values for the measurement.
RX Harmonics
Preparation: Test setup RX3,
Generator = f
Control: ½ Set CMU to connector RF2, Max Level = 2 dBm.
1100.4903.82 1.13 E–4
; level = 0 dBm.
in
Manual Test Procedure CMU
Test: ½ The suppress ion of the signal at twice and three times the input frequency is
measured relative to the input signal.
Preparation:
Test setup RX3
Generator = f
in
; level = –2 dBm
Control: ½ Set CMU to connector RF4 IN, Max Level = 0 dBm.
Test: ½ The suppression of the s ignal at twice and three times of input frequency is
measured relative to the input signal.
RX Spurious Response / Image Rejection
Preparation: Test setup RX3,
Generator = f
Control: ½ Set CMU to connector RF2, Max Level = 2 dBm, Mode = Low Distortion
Test: ½ The suppression of the spurious or image signal is measured relative to the
input signal.
Preparation:
Test setup RX3,
Generator = f
Control: ½ Set CMU to connector RF4 IN, Max level = 0 dBm, Mode = Low Distortion
; level = 0 dBm.
in
; level = –2 dBm.
in
Test: The suppression of the spurious or im age signal is meas ured relative to the input
signal.
RX SSB Phase Noise
Preparation: Test setup RX3,
Generator = f
Control: ½ Set CMU to connector RF2, Max Level = 10 dBm and to desired frequency.
½ Switch on frequency-selective power meter.
Test: The measurement is taken with a small test bandwidth at different carrier offsets.
Note: The input level is +10 dBm, RBW = 100 Hz
+ df ; level = 10 dBm.
iCMU
--> Phase noise = measured value –10 dB –21 dB.
1100.4903.82 1.14 E–4
CMU Manual Test Procedure
RX Residual FM/AM
Preparation: Test setup RX4,
Generator = f
Control: ½ Set CMU to connector RF4 IN, Max Level = –20 dBm and to desired
frequency.
½ Switch on frequency-selective power meter.
Test: The measurement is taken with an external FM/AM demodulation instrument (FSE
with FSE-B7) via the IF3RXCH1 BNC connector at the rear panel of the CMU.
½ Set the FSE to desired frequency, ref. level, AF filters.
; level = –20 dBm.
iCMU
RX Dynamic/ Average Noise Level
Preparation: No signal is fed in, CMU generator is OFF.
Control: Set CMU to given receive frequency, Max. Level, Bandwidth, Mode = Low Noise.
Test: Use frequency-selective power meter, measurement bandwidth = 1 kHz / 500 kHz,
measured value in dB below reference level (Max. Level).
1100.4903.82 1.15 E–4
Manual Test Procedure CMU
Options for CMU200
The following tests can be carr ied out only if the GSM-MS (CMU- K2x) s of tware options are ins talled and
enabled by entering a key code.
TX GSM Modulation
Only with options CMU-K21, CMU-K22, CMU-K23 or CMU-K24:
The GSM phase/frequency error of a TX path is measured.
Preparation: Test setup TX5:
½ Connect spectrum analyzer FSIQ to RF3 OUT.
Control: ½ Set CMU generator to specified RF frequency.
Output level at RF3 OUT 10 dBm
Training Sequence -> GSM0;
Bit Mod. -> PRBS
Transmission -> BURST
Settings at spectrum analyzer FSIQ:
Mode -> Digital Standards -> GSM
Mode -> Meas Result -> Result_Length -> 146 (the useful part normally comprises
147 bits, however, the FSIQ can be set to an integer number of bits only and
therefore cuts off 0.5 bits at the beginning and at the end of the measurement
range)
Trigger -> Find Sync -> ON
Trigger -> Sync Pattern -> gsm_bts0 (training sequence GSM0)
Trigger -> Sync Offset -> 60 symbols
Test: Phase (rms and peak) and frequency errors are measured according to GSM
recommendation.
RX GSM Demodulation
Only with option CMU-K21, CMU-K22, CMU-K23 or CMU-K24:
The GSM phase/frequency error of a RX path is measured.
Preparation: ½ Connect GSM signal generator to RF2 (test setup RX3).
The signal generator must be synchronized with the CMU via the 10 MHz
reference frequency.
Control: Signal generator SMIQ: GSM signal at given frequenc y, level according to table,
bursted with the following settings:
Digital Std -> GSM/EDGE -> State -> ON;
Digital Std -> GSM/EDGE -> Select Slot -> Burst type -> NORM
Digital Std -> GSM/EDGE -> Select Slot -> Slot Level -> FULL
Digital Std -> GSM/EDGE -> Select Slot -> Data -> PN9
Digital Std -> GSM/EDGE -> Select Slot -> TSC -> TSC0
CMU: GSM Non Signalling, training sequence = GSM 0, trigger source = IF
Power, Trigger Level = Medium
Test:
½ Measure GSM phase error (rms and peak) as well as frequency error.
1100.4903.82 1.16 E–4
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