TESTS AND ADJUSTMENTS
3-29
3.1.6
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 80,0% +/- 0,1% SDM by adjusting SDM from the RMM Program
or the Local Display/Keyboard.
3.1.7
DDM Calibration
NOTE:
Check that all TEST DDM settings are in NORMAL.
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.
3.1.7.1 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.
90Hz Dominance Preset
Utilize the Field Test Set as in the previous test.Set the TEST DDM in position 90 Hz domi-
nance 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).
150Hz Dominance Preset
Utilize the Field Test Set as in the previous test.Set the TEST DDM in position 150 Hz domi-
nance 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.
3.1.8
Ident Tone Modulation Depth
3.1.8.1 Method 1
Connect the Field Test Set to the CSB BNC test connector in the Cabinet's Change-over sec-
tion.
(Insert a 20 dB attenuator at the input of the Field Test Set in order to avoid overloading).
