ATX MAXNET MNRS Manuale di installazione e funzionamento - Pagina 9
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THRESHOLD LEVEL SETTINGS
3.
Threshold Level Settings
3.1.
Coarse Setting (3-9 dB) - Recommended
•
Adjust the SET THD potentiometer fully CCW
•
Press and release the reset (RESET) push button:
◦
the B ACTIVE LED should turn off
◦
the RF PWR level bar graph should indicate a level between 40 and 70 dBmV
•
Adjust the SET THD potentiometer CW:
◦
obtain a reading on the THD bar graph one bar below that indicated on the RF bar graph (see Figure
#4 below)
NOTE: Threshold (THD) should not be set greater than 15 dB below RF Power (RF) indicator level.
3.2.
Fine Setting (3 dB) - Advanced
•
Adjust the SET THD potentiometer fully CCW
•
Press and release the reset (RESET) push button:
the B ACTIVE LED should turn off
◦
◦
the RF PWR level bar graph should indicate a level between 40 and 70 dBmV
•
Connect a DVM (Fluke 87 or equiv.) between the RF test point (black - negative lead) and the THD (red - positive
lead)
•
Adjust the SET THD potentiometer CW:
◦
obtain a reading on the DVM of -150 mV (-3 dB)
NOTE: Voltage scaling for RF and THD test points is 50 mV/dB
MAXNET
– MNRS Redundant RF Detector/Switch Module – Installation & Operation Manual
®
ATX Confidential & Proprietary
Figure #4: MNRS Front Panel Bar Graph Display
(Threshold set for 3-9 dB)
CHAPTER 3: THRESHOLD LEVEL SETTINGS
3-1