Marconi Instruments 2955 - Page 3

GENERAL
INFORMATION AND
DATA
GPIB
interface
unit
Pnis unit greatly
extends the
versatility of
the instrument,
and
allows
the
instrument
to form part
of an automatic test system.
The
GPIB
additionaliy
enables
a display
to
be configured
to the user's
own
requirements
using
a
comprehensive
character
set.
The
GPIB also
enables a 24
column
ticket
printer
option
to
be used.
Calibration
and
test
Routine
calibration
needs
have been
kept
to a minimum,
and
calibration
factors
stored
in a
non-volatile
memory
may
be accessed
with
a
secure access
code
from
the
front
panel
keys,
or
via
the GPIB,
permitting
rapid recaiibration.
A built-in
seif
test
facility
may
be called
whenever
required which
enables faults
to
be
identified
to
major
module
level
or to
groups
of components.
SPECIAL
FEATURES
Transmitter
test
Setting:
TX key
press
selects test mode.
Auto-tuning:
Typically
under
3
seconds to acquire and measure:-
RF frequency.
RF power.
Modulation
frequency
and
level.
Modulation distortion.
Manual
tune:
Displays
positive and negative
frequency offset
from
carrier.
3 digits and decimal point
indicate
most
significant error.
Tones
decoder:
’
Decodes
CCIR, ZV'EI. DZVEI, EEA
(or
EIA)
and
user-defined
menu.
Provides tone number,
fre-
quency
and % error for up to 12 tones.
Tone deviation
and duration may be
monitored
using
the digital
storage
scope
in
TX
test
mode.
RX=TX
key:
Presets the RF signal
generator
frequency
for
receiver
test mode to
chat
shown in
TX
mode.
HOLD
DISPLA.V
key:
Freezes
screen setting
and readings,
facilitating
high
RF
power
measurements and
hard
copy
printout
of
TX. RX. duplex or AF
rest
screens.
Receiver
test
Setting:
RX
key press
selects rest
mode.
Default settings
of
RF
level,
modulation
frequency
and
level
reduce function
test
time.
Signal
generator:
Output
level accuracy >2
dB
over
entire
frequency.
temperature and attenuator
ranges.
Level
units
key-
board selectable either dBm
or
piV. Software
menu
allows user to
switch
between
PD
and
EMF
levels.
463S1
-622N
Aug.
S3
fAm.
5)
1-3