NORMARC NM 7000 Series, Инструкция по установке и пусконаладке, Страница: 141 / 189

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The RF phase (90° start phase) can be adjusted by trimmer RF PHASE on the back of the
LPA/GPA.
Adjust until the minima points between the smallest peak waveform reach the baseline or a
minimum.
1.2.6 SDM Calibration
Connect the NM 3710 Field Test Set to the CSB BNC test connector in the Cabinet's Change-
over section.
(Insert a 20 dB attenuator at the input of the Field Test Set in order to avoid overloading).
SDM should be calibrated to 40.0% +/-0.1% SDM by adjusting SDM from the RMM Program
or the Local Display/Keyboard.
1.2.7 DDM Calibration
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Connect the NM 3710 Field Test Set to the CSB BNC test connector in the Cabinet's Change-
over section.
(Insert a 20 dB attenuator at the input of the Field Test Set in order to avoid overloading).
DDM should be calibrated to 0.0% +/-0.05% DDM by adjusting DDM from the RMM Program
or the Local Display/Keyboard.
1.2.7.1 TEST DDM Setting
TEST DDM with 90Hz or 150Hz dominance can be switched on and off from the RMM Pro-
gram or the Local Display/Keyboard. The DDM values inserted by TEST DDM are preset val-
ues which is set as described below.
a) 90 Hz dominance preset
Utilise the Field Test Set as in the previous test.
Set the TEST DDM in position 90 Hz dominance from the RMM Program or
the Local Display/Keyboard. Adjust the (90 Hz) test DDM setting until a
wanted DDM value indicating (-) sign is obtained. (Typical value: -0.8%...-
1.0% DDM).
b) 150 Hz dominance preset
Utilise the Field Test Set as in the previous test.
Set the TEST DDM in position 150 Hz dominance from the RMM Program or
the Local Display/Keyboard. Adjust the (150 Hz) test DDM setting until a
wanted DDM value indicating (+) sign is obtained. (Typical value:
0.8%...1.0% DDM).
Set the TEST DDM back to normal.