Table 3-1. Operator Controls and Indicators

TM 11-6625-542-14-1

Control or indicator

Function

CANCEL pushbutton ................................................................. When depressed, will cancel any or all pushbuttons depressed on

front panel.

SINE WAVE pushbuttons

Depressing any one of three pushbuttons (50MC, 10MC, 5 MC)

provides a sine wave signal, at the MARKER OUT connector,

that

is equal to frequency marked directly over pushbutton.

NOTE

Only one signal may be used at any one time, and may only be

obtained by MARKER OUT connector.

MICROSECONDS pushbuttons.................................................

NOTE

The sixth marker pushbutton (500 s) is located in the next lower group

of pushbuttons. Depressing any one of six pushbuttons provides time-

mark signals at MARKER OUT connector, equal to rate marked above

each pushbutton.

NOTE

More than one pushbutton may be pressed at a given time. In this

situation their values will be additive.

Example; when 1

MICROSECONDS pushbutton is depressed, time-mark signal at the

MARKER OUT connector will be one microsecond.

If 5

MICROSECONDS pushbutton is then depressed, time-mark signal at

MARKER OUT connector will then be six microseconds.

MICROSECONDS jacks

Located directly below each pushbutto n, these jacks provide a

time-

mark signal equal to that of pushbutton directly above it.

Function of these jacks are independent of MARKER OUT connector,

and any other pushbutton that may be depressed.

NOTE

It is not necessary to depress pushbutton to obtain time-mark

pulse.

MARKER OUT connector

Point at which time-mark signals, from any or all of time-mark

circuits marked microseconds, milliseconds, and second,

including

sine wave signals from sine wave circuits, are

obtained.

MILLISECONDS pushbuttons

Provides time-mark signals, at MARKER OUT connector, equal

value marked above each pushbutton.

NOTE

More than one pushbutton may be depressed at a given time. In this

situation their values will be additive. Example: when I

MILLISECONDS pushbutton is depressed, time-mark signal will be

one millisecond. If 50 MILLISECONDS pushbutton is then

depressed, time-mark signal will then be 51 milliseconds.

SECONDS pushbuttons

Provides time-mark signals at MARKER OUT connector equal

value marked above each pushbutton. When both are

depressed, their values will be additive.

MILLISECONDS and SECONDS jacks

Located directly below each pushbutton, these jacks provide a

time-

mark signal equal to that of pushbutton directly above it.

Function of these jacks is independent of MARKER OUT

connector,

and any other pushbutton that may be depressed.

NOTE

It is not necessary to depress pushbutton to obtain time-mark

pulse.

TRIGGER RATE pushbuttons

Provides trigger pulses, at the TRIGGER OUT connect or, equal

value marked above each pushbutton.

NOTE

Trigger pulses are available only at TRIGGER OUT connector,

and

only one pushbutton may be depressed at a time.

TRIGGER OUT connector ......................................................... Point at which trigger pulses are obtained.

POWER ON switch

Applies or removes power to AN/USM-108A.Application of

power is

indicated when lamp immediately to the left of POWER

ON switch is illuminated.

3-2