Northern Airborne Technology PA700 - Manual (Page 14)

PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
Section 2 Rev: 1.01 Issue 4 Page 2-5
ENG-FORM: 805-0117.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
2.5 Accessories
A range of accessories are available for testing and complementing the sound system.
2.5.1 Dummy Load
The TL-PA2 is a 2 Ohm resistive load with a three foot cable and type MS3106A-16-11P connector for
ready substitution in the speaker circuit or for connecting to the Meter Test Unit. One dummy load should
be used per channel. The use of resistive dummy load facilitates testing and power measurements,
especially when ‘quiet’ operation is desirable.
2.5.2 Meter Test Set
The TL-PA4 Meter Test Set is a convenient test unit complete with connectors and cables for inserting
into the power circuits of an amplifier and measuring both the DC current drawn and AC voltage
generated across the load. The load may be either the speakers or the TL-PA2 dummy load (checks one
channel at a time).
2.5.3 Protective Circuit Test Unit
A Protective Circuit Test Unit is available to test the protective circuit so that its proper adjustment is
assured. This unit, used with the TL-PA2 dummy load, provides GO/NO GO limits for correctly setting the
trip level.
2.5.4 Paralleling Transformers
Paralleling transformers are available for driving up to four amplifiers from the same audio signal source.
2.5.5 Remote Controls
Units may be obtained to control and/or monitor between one and eight amplifiers in parallel. All remote
units provide audio gain control and on-off power switching. A special junction box located at the
amplifiers is required in multiple amplifier systems for cable terminations and control functions. Aviation
specific configurations and other information are available upon request.
2.5.6 Tape Recorder/Players
Cables and adapters are available to interface tape recorders with the high powered voice amplifier
systems.