Manual Test Procedure CMU
1100.4903.82 1.10 E–4
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 trigger cable from CMU (D-sub connector 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 frequency, 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:
CMU: Switch generator on and set level to minimum (–130 dBm or
–90 dBm), switch RF wideband analyzer on (RF1/RF2/RF4 IN).
Test: ½ Measure VSWR at 10 MHz, 900 MHz, 1800 MHz, 2700 MHz.
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