SME Test Procedure
1038.6002.02 5.31 E-13
5.2.33.2 Deviation Error
Test equipment Test system 5.1.1.5
Measurement
À Adjust the d.c. voltage at the FM demodulator output to 0 V±10 mV
by means of a fine adjustment of the carrier or LO frequency with
GFSK modulation switched off.
À Adjust the carrier frequency to 253.4 kHz offset to the above
adjustment at the test object, measure the voltage at the FM
demodulator output and note down as U
ref.
À Set the original carrier frequency again.
À Now switch on the modulation at the test object again using
SOURCE DATA and enter a "LOW-HIGH sequence" ("01") using
the list editor with DATA and BURST.
Square-wave signal at the DATA output ............................. HC level
.............................................................frequency 576 kHz ±0.1%
Square-wave signal at the BURST output........................... HC level
.............................................................frequency 576 kHz ±0.1%
Square-wave signal at the CLOCK output............................HC level
..........................................................frequency 1152 kHz ±0.1 %
Diagnostic voltage at test point 301 .....................................6.3 ±1 V
After 10 average sweeps an almost sinusoidal signal must be
measured at the digital oscilloscope whose peak voltage must be
V
ref
±7%.
À Now enter the sequence "11111111011111111" using the list
editor.
After 10 average sweeps a pulse signal must be measured at the
digital oscilloscope whose voltage peak is about V
ref
±7%.
À Enter the sequence "00000000111111111" using the list editor.
After 10 average sweeps a square-wave signal with an amplitude
of 1.136×V
ref
±3% must be measured at the digital oscilloscope
whose overshoot must be smaller than 5%.
Recommended settings for the measurement using the digital oscilloscope
F (RF)
50 MHz 750.1 MHz 1099 MHz 1101 MHz 1500 MHz 2200 MHz 3000 MHz 6000 MHz
Mixer
xxxx x x x
F (LO)
800.1 MHz 1149 MHz 1151 MHz 1550 MHz 2250 MHz
(SME03E/03/06)
2950 MHz
(SME03/06)
5950 MHz
(SME06)
To Next Page
Loading...
