Table 4-11. MODULE TEST SET CONTROLS AND INDICATORS (Cont'd)

TM 11-5895-1141-34

Controls/indicators or

Function

Connector

PRESS FOR XMTR LOAD switch

When pressed, places the equivalent of

23 installed selector modules as an

additional load upon the amplifier in

the microphone amplifier/lamp

brightener module.

600-Ω DUMMY LOAD switch

When positioned to IN, routes input

S10

signals to a 600 ohm resistor instead

of to the INPUT SELECT switch.

20-dB

ATTENUATOR switch S9 When positioned to IN, attenuates

input voltage by a factor of ten

(20 dB).

EXTERNAL/INTERNAL INPUT

In EXTERNAL position, the input test

switch S5

signals are provided by a source

connected to the EXT SIGNAL INPUT

terminals.

In INTERNAL position, the input test

signals are provided by the

oscillator circuit of the test set.

P/T KEY switch S7

With jack unit not connected for test,

this switch simulates keying of

selected channel by operator. With

jack unit connected for test, this

switch keys the transmitter and allows

only the signal appearing at the

instructor headset Jack of the Jack

unit to be transmitted.

4-10.

PROCEDURE FOR TESTING MODULES

This section includes tables detailing the procedure for using the MTS-2400 Test Set to test the following modules:

Microphone Amplifier/Lamp Brightener Module

Recorder-Monitor Module

4-31