Programming
A GPIB interface is fitted so
that all functions are controllable
via the interface bus
which
is
designed to the IEEE Standard 488.2. The instrument
can function both as a
talker and
a
listener.
Protection
To
prevent accidental interference with the contents
of internal memories,
internal
data is
protected by a secure key sequence.
Two levels of protection are offered, appropriate to
the function being accessed.
The
most secure is
reserved
for features
which alter the calibration data
of the instrument. The first
level of protection is less severe, enabling the
user
to
access functions which are
relevant
to
normal operation, such as
selecting the RF level calibration
units, RF level offsets and external
standard frequency.
Spectral purity
With an SSB phase noise
performance of better than
-140dBc/Hz at 1 GHz
(20
kHz
offset), the 2040 series can be used for both
in-channel and adjacent channel
receiver
measurements. Harmonically related
signals and
non-harmonics are better than -30dBc and
-90
dBc respectively.
Calibration
The 2040 series has a two
year calibration interval and is
calibrated entirely by
electronically controlled adjustment. TTiere are no
internal mechanically adjustable
components
to affect the calibration. The
calibration display
is
available
via
soft
key selection at the utilities
menu.
Options
The
following factory-fitted options are available:
Option 001
-
Second modulation oscillator
An additional modulation oscillator is
available
to
enable greater
flexibility. This second
oscillator has the same
specification as the first and allows full
use of complex modulation
modes.
Option 002
-
Pulse modulation
The pulse modulation facility
allows radar RF and IF stages to be
tested and features rise
and
fall times of less than 15 ns with an on/off
ration of better than 70 dB.
Option
003
-
High output power
This option extends the
output level to +19 dBm on the
2040 model.
Option 006
-
Avionics
Provides internally generated
modulation waveforms suitable for the
testing of
Instrument Landing systems
(ILS) and VHF Omni Range
(VOR) beacons.
1-4
46882-074C
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