36 News from Rohde & Schwarz Number 162 (1999/II)

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CMD 55 reduces test times

Faster – further – higher. This princi-ple is the driving force not only insports but also for measurements. Fastservice of good quality throughout isessential for successful marketing,particularly of mass products like mo-bile phones.

This is why Motorola also uses thefast Digital RadiocommunicationTester CMD 55 from Rohde & Schwarzin its GSM Service Test SystemsGATE 22. Because this digital multi-mode, compact tester offers consider-ably shorter test times than compara-ble solutions. Short test times for eachphone increase the throughput ratefor repairs, particularly in a standard-ized shop environment similar to thatin production.

High quality through standardi-zation

Motorola expects its authorized serv-ice partners to use standardized sys-tems for the alignment and testing of

Motorola Service Test System GATE 22:Faster with T & M from Rohde & Schwarz

VPhone

Industrial PC

PSU 1

PSU 2

PSU 3

EMMI

RadiocommunicationTester

CMD 55

RFin / RFout

AFout

AFin

Rx Hi

Tx

Vout

Vout

Vout / Vsense

RS-232-C

IEC/IEEE bus

VPhone,Ctrl, AFin/out

FIG 1 Schematic of GATE 22: EMMI (electricman/machine interface) is the only interface tothe phones besides the RF link

• four horn antennas with remote-controlled polarization on tiltable support (elevation 0 to –20°).

The field-strength sensor is connectedto the monitor in the control room. Foran EMS test using the substitutionmethod, the sensor need not bemoved to a great height because thereference calibration performed at aheight of say two meters is also validhigher up. If a field-strength measure-

ment is nevertheless desired duringthe test, the antenna mast of an EMItest system can be used.

Amplifiers with sufficient outputpower have been chosen for the fre-quency range below 1 GHz and in-stalled in a shielded room. Connec-tion to the antennas on the platform isvia the coaxial cable in thedragchain.

The telescopic, scissor-type liftingplatform with the EMS test system is ofparticular interest for EMC laborato-ries that have to test large DUTs. If thetest frequency range is to be ex-tended at a later stage, the describedplatform is the ideal choice.

Reinhard Göster

Reader service card 162/14

GSM mobile phones. The same testsworldwide guarantee high repairquality, and firm test times allow opti-mum planning of resources. ServiceTest System GATE 22 (generic auto-mated test environment) was devel-oped by Motorola's service engineer-

ing departments. Hardware designwas harmonized in close cooperationwith two manufacturers of the instru-ments used in the system. These man-ufacturers are also responsible for as-sembly, final inspection and dispatchto the user. Service Test System

News from Rohde & Schwarz Number 162 (1999/II) 37

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GATE 22 thus comes in two versionsand the Motorola service centers canchoose their model.

FIGs 1 and 2 illustrate the Rohde &Schwarz version. The nucleus of thesystem is Digital RadiocommunicationTester CMD 55, which establishes anRF connection to the phone and per-forms RF and audio tests. Mobiles arepowered from three power supplyunits connected to the EMMI (electricman/machine interface). Except forthe RF connection, the EMMI is theonly interface with the phones for ap-plying power and audio signals or forcontrolling and programming.

Motorola software

The test systems are driven byGATE 22 for Windows software, writ-ten and continually upgraded byMotorola. It includes a number of pre-defined tests:• Call measurement Telephone pa-

rameters are measured during a call in various, adjustable test channels

• Phasing All adjustable telephone parameters are adjusted without any action on the part of the user

• Final test Phasing and call meas-urement test are performed without any interruption

• Flashing Update of telephone firmware

• Flexing Matching of telephone software and features

Additional software tools are avail-able for more complex repairs. To al-low for local conditions (eg interfer-ence or work flow in the servicecenter) that might cause problems forthe test sequence, some test parame-

ters can be adjusted within preset lim-its (eg test and phasing channels aswell as autoprint function).

Worldwide support

Service Test Systems GATE 22 areused worldwide in all service areas.Updating of test software and devel-opment of test adapters for new tele-phone models are tasks centralized inGermany at Motorola in Flensburg.Regional Motorola staff and trainedpersonnel are responsible for on-sitesupport.

A support page from Motorola isavailable on Internet to all GATE 22users. It contains the current versionsof the test software, flash and flex filesand lots more for downloading. Aspecial service is the online order sys-tem for spare parts. In this way cablesand other accessories can be orderedstraight from the manufacturer for ex-ample.

Competence close to user

For integration of Service Test Sys-tems GATE 22, Rohde & Schwarz hascreated competence centers world-wide in Europe, America and the FarEast, ie as near as possible to the userand as centralized as necessary.Through close cooperation with theMotorola support groups, compre-hensive support can be provided tothe service centers.

Axel Schneider (Motorola); BerndPetersen (Motorola); Martin Stumpf

Reader service card 162/15 for more infor-mation on CMD55

FIG 2Rohde & Schwarz model of GATE 22: DigitalRadiocommunication Tester CMD 55 consider-ably speeds up Motorola’s GSM service testsystem compared to solutions from other man-ufacturers.