Motorola Timeport P8190, Service Manual

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Motorola Confidential Proprietary
Test Procedures Service Manual
53
EVM Measurements
DIGITAL MEASUREMENTS
DTC Meas
Pwr Gain
Auto / Hold
Traffic Chan
333
Slot
DVCC
1
To Screen
CALL CNTL
CALL CNFG
ANLG MEAS
SPEC ANL
DIG MEAS
More
EVM 1
Amplitude
-50.0
dBm
1
Frequency Error
%
3.9683
EVM kHz
0.0081
dB Peak EVM %
TX Power
-2.35879 11.6270
20 dB
Trig Type
2X Frame
Figure 40. Digital Measurements Screen
TX Frequency Error Measurement Test
1 Make sure the Test Set is in Active
mode.
2 Select DIG MEAS from the To
Screen .
3 Select the DTC Meas field. This
shows the To Screen with a list of
available tests.
4 Select EVM 1 . EVM 10 can also be
selected, it measures a 10 burst aver
age.
5 Traffic Chan should be set to 333.
6 Put the mobile into test mode.
7 EVM is displayed.
Test Mode Commands:
1 Enter 575# (Digital signaling mode)
2 11333# (Loads synthesizer Channel)
3 Display prompt “Y” (enter time slot)
4 Set power level to step 2 (122#)
5 Turn on transmitt carrier (05#)
The 10 burst average EVM measured should
be less than or equal to 10% .
You can also use Digital Call processing to
make these measurements.
EVM Measurements