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GENERAL
The purpose of this document is to
•
Ensure that all operating functions are working before the equipment is put into service.
•
Establish useful reference data and settings for comparisons to routine maintenance data
and trouble shooting.
REQUIRED TEST EQUIPMENT
•
Vector voltmeter or Network Analyser
•
ILS Field Test Set NM3710 with 20 - 30 dB external input attenuator
•
General purpose Oscilloscope
•
Frequency Counter, 30 Hz to 350 MHz
•
Digital Multimeter
•
Directional Coupler, 75 - 350 MHz
DESCRIPTION OF TEST PROCEDURE
1.1 - 1.2 , 1.8 - 1.9
(COURSE AND CLEARANCE SECTIONS)
Connect NM3710 (use external 20-30 attenuator at BNC input) to COURSE RF BNC test
point and CLEARANCE RF BNC test point of Cabinet Coaxial section respectively. Use
keypad CHANGE OVER to alternate between Tx 1 and Tx 2. Read DDM and SDM.
1.3, 1.10
(COURSE AND CLEARANCE SECTIONS)
Connect the Frequency Counter (use 50
Ω
input port) to COURSE RF BNC test point and
CLEARANCE RF BNC test point of Cabinet Coaxial section respectively. Use keypad
CHANGE OVER to alternate between Tx 1 and Tx2.
1.4 - 1.5
Connect the Frequency Counter (use HI imp. input port) CSB BNC test point on Transmit-
ter section LPA1230.
90 Hz count: Switch off 150 Hz tone.
150 Hz count: Switch on 150 Hz tone and switch off 90 Hz tone.
1.6, 1.11
Not applicable
1.7, 1.12
Not applicable
1.13
Connect the Digital Multimeter (volts DC) to the BATTERY terminals. (Batteries shall be
fully charged). Read the voltage.
2.1 - 2.2
Connect the NM3710 to the monitor input CL cable (from MCU). Use keypad CHANGE
OVER to activate the second transmitter. Read DDM and SDM.
Summary of Contents for NM 7000 Series
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