The 2040 series of low noise signal
generators covers a wide range of
frequencies from 10 kHz to 1.35 GHz
(2040), 10 kHz to 2.7 GHz (2041) and
10 kHz to 5.4 GHz (2042). With a choice
of operating modes, two low noise modes
for improved SSB phase noise and normal
mode for increased flexibility, the 2040
series can be used in a wide variety of
applications. Microprocessor control
coupled with a large screen dot matrix
display provides ease of use via menu
driven displays. Set up time is further
reduced by recalling previously stored
instrument settings from the non-volatile
memory. Remote programming via the
GPIB is provided as a standard feature,
allowing the instruments to be incorporated
in automatic test systems.
EXCELLENT SPECTRAL PURITY
The excellent noise characteristics and
the low level of spurious signals of the
2040 series enable the instruments to be
used with confidence for a wide range of
critical measurements.
Low SSB Phase Noise
With a specified SSB phase noise performance of better than –140 dBc/Hz at
20 kHz offset from a carrier of 1 GHz, the
2040 series of signal generators is easily
able to measure UHF receiver selectivities
beyond 90 dB.
The low residual FM noise figure (less
than 0.3 Hz RMS at 1 GHz) gives the 2040
series the capability of measuring UHF
receiver signal to noise ratios as high as
80 dB.
Typical phase noise performance at 1 GHz
Low spurious signal content
A specified non-harmonic spurious
signal content of –90 dBc ensures the
suitability of the 2040 series for the most
demanding measurements on modern
receivers and RF systems.
Display
A large screen, dot matrix liquid crystal
display, with backlighting, offers excellent
clarity and low power consumption.
The parameters displayed on the screen
depend on the operating mode selected;
for example in the Signal Generator mode,
carrier frequency, modulation and RF level
are shown in separate horizontal regions.
Status information is also shown with error
messages being displayed in a single line
at the top of the screen.
Frequency selection
Carrier frequency entry is selected via a
soft key option on the signal generator
screen and data is then entered directly via
the keyboard. Frequency is resolved to
within 0.1 Hz across the complete range of
the instrument. Carrier frequencies can be
stored in the non-volatile memory for recall
at any time. A CARRIER ON-OFF switch is
provided to completely disable the output.
RF Output
RF output up to +13 dBm can be set by
direct keyboard entry with a resolution of
0.1 dB or better over the entire range. An
extended hysterisis facility allows for
extended electronic control of RF output
level without introducing mechanical
attenuator transients when testing squelch
systems and an overrange facility allows
2040 series
10 kHz to 5.4 GHz Low Noise Signal Generator
Signal Generators
2040 series
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Excellent noise
characteristics and low
spurious signals for a
wide range of critical
measurements
Wide band cover:
10 kHz to 1.35 GHz (2040)
10 kHz to 2.7 GHz (2041)
10 kHz to 5.4 GHz (2042)
Low residual FM noise: 0.3 Hz
RMS at 1 GHz
Low spurious signals: –90 dBc
non-harmonics
Low phase noise: –140 dBc/Hz at
1 GHz
Comprehensive modulation modes
+13 dBm output (+19 dBm
optional)
0.1 Hz to 500 kHz modulation
oscillator
Comprehensive frequency and
amplitude sweep capabilities
the generator to produce RF levels above
the normal operating range. A high output
option is available to extend the maximum
calibrated level to +19 dBm on 2040.
A low intermodulation mode can be
selected which disables the RF levelling
system and improves the intermodulation
performance when combining the outputs
of two signal generators.
50 W Protection
An electronic trip protects the generator
output against reverse power of up to
50 W, preventing damage to output circuits
when RF or DC power is accidentally
applied. This feature contributes to long
unit life and low cost of ownership.
VERSATILE MODULATION CAPABILITIES
Comprehensive amplitude, frequency
(plus Wideband FM), phase and optional
high speed pulse modulation are provided
for testing all types of receivers.
Modulation Oscillator
An internal modulation oscillator is
provided with a frequency range of 0.1 Hz
to 500 kHz, resolved to 0.1 Hz. In addition
to the normal sine wave output an
alternative triangular or square waveform
may be selected for sweep applications. A
second oscillator may be added as an
option. Two independent BNC inputs on the
front panel allow external modulation
signals to be mixed with the internal
signal(s) allowing a maximum of four
modulation channels to be active at one
time.
Modulation Modes
Four modulation modes are provided –
single, dual, composite and dual
composite. In the single mode only one
type of modulation can be active at any
time. Selecting alternative modulation
cancels any other active modulation. In the
dual mode two types of modulation may be
obtained allowing one form of frequency
modulation to be combined with one form
of amplitude modulation. In the composite
mode, only one type of modulation can be
active, and is fed by two independent
channels. The dual composite mode
combines the facilities of the dual mode
with the composite mode and provides two
types of modulation each fed from two
sources.
Frequency and Phase Modulation
The wide range frequency modulation
capability provides a 1 dB bandwidth of
300 kHz and provides FM deviation up to a
maximum of 1 MHz for frequencies up to
21 MHz, 1% of carrier frequency elsewhere. Phase modulation is also available
with a 10 kHz bandwidth up to a maximum
of 10 radians.
Both AC and DC coupled FM are available and in the DC coupled mode a
patented offset correction system eliminates the large carrier frequency offsets that
occur with normal signal generators. As a
result the 2040 series signal generators
can be used confidently for testing tone
and message paging equipment.
Wideband FM
Broadband frequency modulation with a
3 dB bandwidth of 10 MHz is provided via
a rear panel BNC socket. This is ideal for
tests on equipment using frequency shift
keying for high speed digital transmission.
Amplitude and Pulse Modulation
Amplitude modulation with a 1 dB bandwidth of 30 kHz and with modulation
depths of up to 99.9% is available with a
resolution of 0.1%. Fast pulse modulation
is available as an option with rise and fall
times of less than 25 ns and a 70 dB
on/off ratio.
Modulation Levelling
An automatic level control facility is
provided for both of the external
modulation inputs and provides correctly
calibrated modulation for input levels
varying from 0.7 to 1.4 V RMS. Hl and LO
indications show when the input level is
outside the range of the ALC system.
Tone Signaling
The signaling facility allows testing of
radios with DTMF, sequential and subaudible tone capability. A wide range of
tone system standards are built in and
provision is also made for user definable
standards to cover special requirements.
Tone sequences can be set up with up to
16 tones in length and the complete
sequence can be sent from 1 to 9 times or
set to repeat on a continuous basis. Subaudible tones are normally used in the
composite modulation mode where the
modulation level for the tone and the inband modulation can be set independently.
Delta Display
The Delta menu allows the increment
values for all the parameters to be set and
also includes a TOTAL SHIFT key to show
the variations in the parameters from their
last keyed in value, a RETURN key to reset
the selected parameter to its start value
and a TRANSFER key to update the parameter value to equal the shifted value.
FREQUENCY AND LEVEL SWEEP
The digital sweep capability of the 2040
series allows dynamic testing of systems
and includes capabilities for sweeping
carrier frequency, RF level, LF frequency
and LF level. Four parameters are entered
to specify the sweep – start value, stop
value, number of steps and time per step.
Markers and Ramp Output
Five markers may be defined and a
marker output is provided on a rear panel
socket together with a 0 to 10 V ramp
signal for driving the X axis of an
oscilloscope or X-Y plotter.
Option 8 provides additional sweep
capabilities which allow the step size, step
time and RF level to be entered.
Start/Stop
A single key press starts the sweep and
a horizontal bar graph on the display shows
the progress of the sweep. The sweep can
be stopped at any time and the Up/Down
keys used to step forwards or backwards
for search purposes. Transfer of the current
sweep value into the signal generator or LF
modes for more detailed analysis is also
possible. The sweep facility can be used in
conjunction with a simple X-Y display unit,
an oscilloscope or an X-Y plotter.
POWERFUL NON-VOLATILE MEMORY
True non-volatile memory needing no
battery back-up is fitted to the 2040 series
and is used to store details of instrument
settings and calibration information.
Instrument Settings
Details of instrument settings are stored
in four areas of memory. One area stores
50 complete instrument settings (including
data on parameters which are not currently
active), a second area stores 50 partial
settings (consisting of details about the
currently active parameters), a third area
stores details of 100 carrier frequency
values and a fourth area stores details of
20 sweep settings. Facilities are provided
to prevent the memories from being
accidentally overwritten and for recalling a
specified memory at switch-on.
Calibration Data
In addition to storage and recall of
measurement settings, the non-volatile
memory contains data on instrument
status and calibration. All calibration data
on RF level, FM accuracy, internal
frequency standard adjustment and
modulation are retained and may be
altered from the front panel or via the GPIB
after disabling the software protection.
Status information stored includes the
identity string (type and serial number),
choice of internal/external standard, GPIB
address, elapsed time and a date alarm for
calibration due reminders.
GPIB 488.2 PROGRAMMING
A GPIB interface is fitted as standard so
that all functions are controllable over the
bus. The instruments function as talkers as
well as listeners and the interface has been
designed in accordance with the IEEE
488.2 standard.
SIMPLE CALIBRATION
The 2040 has a two year recommended
calibration interval, with all routine calibration adjustments carried out without
removing the instrument covers. The
calibration display is available via soft key
selection in the utilities menu.
2040 series
2040 series
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