Directed Electronics 554A Instructions d'exploitation télécharger pdf (Page 13)

TM 11-6625-2611-12

Section IL INSTALLATION INSTRUCTIONS

2-4. Tools, Test Equipment, and Materials

place other equipment within 1 inch of either side of

Required for Installation

the test set to allow for adequate cooling.

An oscilloscope only is required for installation, to view

2-7. Interconnections

output wave forms of test set.

Remove the front panel cover. The front panel cover is

2-5. Assembly of Equipment

secured to the test set by four latches, two on each side.

The test set is shipped assembled and ready for opera-

Remove the power cable from the front panel cover. Be

tion.

sure front panel POWER switch is OFF. Connect the

2-6. Installation Procedures

power cable between POWER connector and power

Place test set so that no forced-air cooling from other

source (115 VAC, 45 to 66 or 380 to 420 Hz).

equipment is directed on the sides of the test set. Do not

Section Ill. PRELIMINARY ADJUSTMENT OF EQUIPMENT

2-8. Operator’s Controls, Indicators, and

Connectors

Table 3-1 identifies and describes the functions of con-

trols, indicators, and connectors of the test set. Figure

3-1 shows all controls, indicators, and connectors.

2-9. Typical Bench Test Setup

A typical bench test setup for making the following

transponder measurements is shown in figure 2-2.

Diversity characteristics

Receiver bandwidth and center frequency

Minimum triggering level at normal and low

sensitivity

Duty cycle limit

Reply rate limit

Mode 4 rate limit

Internal suppression-decode

Internal suppression~external

ISLS recognition

Decoder characteristics

Pulse width discrimination

aa.

ab.

ac.

ad.

ae.

Transmitter output frequency

Transmitter output power

Transmitter output pulse shape

Transponder delay

Transponder jitter

Reply code spacing and coding

I/P reply characteristics

Emergency reply characteristics

Auxiliary trigger operation

Mode C operation

Mode 4 reply characteristics

Disparity action

Mode 4 enable trigger output

Mode 4 video output

Mode 4 audio output

Mode 4 challenge video output

Mode 4 reply light enable

Mode 4 caution light enable

Random triggering rate

External suppression output

2-3

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Directed Electronics 554A Instructions d'exploitation Page 13

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