Directed Electronics 554A Instruções de Operação descarregar pdf (Página 24)

TM 11-6625-2611-12

Table 3-1. Operator’s Controls, Indicators, and Connectors (Continued)

Figure

3-1

index No

3-4

Control, indicatar,

connector

SCOPE TRIG/FREQ MEAS DELAY (USEC) MULT

control

MEASUREMENT MKRS OUT jack

MEASUREMENT MKR PHASING control

MEASUREMENT SCOPE TRIG OUT jack

MEASUREMENT DEMOD VIDEO LEVEL control

MEASUREMENT DEMOD VIDEO OUT jack

MEASUREMENT FUNCTION SELECT (4-position

rotary) switch

Function

tion between mode 3/A challenges.

Switch position

Function

OFF

X0.4

X40

X400

Neither scope trigger nor challenge video is

delayed. Scope trigger occurs 27

sec before P3

pulse when CHAL MODE SELECT switch is set

to 1, 2, 3/A, TEST, or DUAL 3/A. Scope trigger

occurs 2

sec before first pulse of challenge

video when CHAL MODE SELECT switch is set

to 4A or 4B.

Scope trigger or challenge video is delayed 0.4 to

4.4

sec as controlled by SCOPE TRIG/FREQ

MEAS DELAY (USEC) MULT control.

Scope trigger or challenge video is delayed 4 to 44

sec as controlled by SCOPE TRIG/FREQ

MEAS DELAY (USEC) MULT control.

Scope trigger or challenge video is delayed 40 to

440

sec as controlled by SCOPE TRIG/FREQ

MEAS DELAY (USEC) MULT control.

Scope trigger or challenge video is delayed 400 to

4400

sec position as controlled by SCOPE

TRIG/FRIQ MEAS DELAY (USEC) MULT con-

trol.

Varies delay of scope trigger or challenge video within range set by SCOPE

TRIG/FREQ MEAS DELAY (USEC) RANGE switch.

Provides SIF reply markers for measuring SIF reply spacing or frequency

markers used to measure frequency of rf. When CHAL MODE SELECT

switch is in any position and SIG GEN FCTN switch is set to FIXED

FREQ, SIF reply markers are provided at 0,20.30,24.65, and 49.30

sec.

SIF reply markers are accurate within ±0.02

sec. When SIG GEN

FCTN switch is set to SWP ±5 MHZ, frequency markers corresponding

to radiofrequencies of 0, ±1, ±3, and

±5

mHz are provided. The fre-

quency markers are accurate within ±0.1 MHz. The SIG GEN FCTN

switch is set to SWP ±20 MHZ, the markers of which represent, 0, ±1,

±3, ±5, and ±20 mHz.

Varies position of SIF reply markers

sec when present at the

MEASUREMENT MKR OUT jack. Nominal position of SIF reply

markers correspond to nominal position of transponder SIF reply.

Provides scope trigger signals for use by external oscilloscope. Scope trig-

ger signal is 5 ± 1.0 volts in amplitude and 3.0 ±2.0 µ sec wide when ap-

plied to a 100-ohm load.

Adjusts amplitude of signal at MEASUREMENT DEMOD VID OUT jack

when MEASUREMENT FUNCTION SELECT switch is set to PWR.

When adjusted so that signal at MEASUREMENT DEMOD VID OUT

jack is 1.0 volt in amplitude, MEASUREMENT meter indicates peak

power of rf signal applied to the RF IN/OUT jacks. Peak power of signal

applied to LOW PWR MEAS IN jack can also be determined in conjunc-

tion with calibration chart packed in front panel cover and illustrated in

figure 3-2. The chart converts meter indication into actual power being

measured.

Provides test set video output for display on external oscilloscope.

Selects type of measurement to be made with test set.

Switch position

PRF CHAL

PRF REPLY

PWR

Function

MEASUREMENT meter indicates prf of challenge

video generated by test set.

MEASUREMENT meter indicates prf of reply

video from transponder under test.

Sets test set to measure peak power of input rf sig-

nal. When MEASUREMENT DEMOD VIDEO

LEVEL control is adjusted so that signal at

MEASUREMENT DEMOD VID OUT jack is 1.0

volt in amplitude, MEASUREMENT meter indi-

cates peak power of rf signal applied to the RF

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