Marconi Instruments 2955 - Page 37

OPERATION
DISTORTION
METER
(TX)
Fi^. 3~6
Distonion
meter
(TX)
controls
and connectors
TX
key.
Connects
the
distonion
meter
to
the
RF IN/OUT
BNC socket or N
socket
(T)
and
connects
the
AF
generator
to
the
AF GEN OUTPUT socket
(i) .
Writes
on
the
screen
information
concerning
instrument
settings.
(J)
MOD
FM
key
and
LED.
When
me key
is pressed, the LED iights
to
show that the
FM
route
to the
demodulator
has
been
selected.
(T)
MOD
AM
key
and
LED.
When
the
key
is
pressed,
AM route
to
the
demodulator
has
been
selected.
U iC UJ-JL/ U
ii
i i Li
(T)
MOD
DM
key
and
LED.
When
the key
is
pressed, the LED
iights to
show that
the
route
(FM
route
with
the
de
-emphasis)
has
been selected
to the
demodulator.
(
5
)
SELECT
key
and
LEDs.
For
selecting
RF IN/OUT socket
(J)
or
(T).
LED lights
above the
socket
seleci-d.
(j)
RF
IN/OUT
BNC
socket.
For the
transmitter
input,
.Automatically
protected
against
excessive
power.
Impedance
50
Cl.
\7j
RF
IN/OUT
N
socket.
For the cransminer
input.
.A
temperature
sensor
detects
excessive
power
being
applied.
(8^
AF GEN
OUTPUT
socket.
Output
used
to
modulate
the
transmitter
under
test
with
a 1 kHz
tone.
Impedance
5
Cl,