The 2030 series Signal Generators cover the frequency ranges
10 kHz to 5.4 GHz with three models: 2030 (10 kHz to 1.35
GHz), 2031 (10 kHz to 2.7 GHz) and 2032 (10 kHz to 5.4 GHz).
A dot matrix display with soft key selected screen options
allow flexibility of operation and ease of use. The output
may be amplitude, phase, or frequency modulated with pulse
modulation available as an option. Modulation is available
using a combination of up to two external signal inputs and
a built-in LF source (a second internal source is optional).
Microprocessor control ensures that the instruments are
flexible and easy to use and allows programming by the
General Purpose Interface Bus (GPIB). The GPIB is designed
to IEEE Standard 488.2 and is a means of sending commands to
an instrument, via a data bus, from a remote controller or
personal computer. The instruments can therefore be used
manually or as part of a fully automated test system.
MAIN FEATURES Operation
Selection of parameters on the screen may involve one or
more of the numeric, hard or soft keys or the rotary knob.
Hard keys have single or dual functions which remain
constant throughout, whereas soft keys have functions
dependent on the present mode of operation. Parameters may
be set to specific values by numeric key entry, while values
may be varied in steps of any size using the if/ΊΙ keys or
altered by moving the knob, set to a particular sensitivity.
The SIG GEN, LF, SWEEP, MEM (memory), A (delta) and UTIL
(utility) menus are selectable, at any point of operation,
via the keys below the display panel. Within the display,
the soft key functions are indicated by labels which appear
alongside the keys situated at either side of the display panel.
The display is a dot matrix liquid crystal panel, with
backlighting. Carrier frequency, modulation and RF level are
shown in horizontal regions on the principal screen. The
display features 11 -digit resolution for carrier frequency,
4-digit for RF level and 3-digit for modulation, with unit
Contrast may be varied, using the control knob, to optimize
the viewing angle. Differing lighting conditions may be
accommodated using the backlight intensity function,
variable from no backlight to full intensity. A full
graphical display test is available, refer to the Service
Carrier frequency is selected via the soft key option on the
SIG GEN display and direct entry via the keyboard.
Alternatively, selection may be made via the General Purpose
Interface Bus (GPIB). Frequency resolution is 0.1 Hz across
the band. Carrier frequencies can be stored in a
non-volatile memory with complete recall when required. An
ON-OFF key is provided to completely disable the 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.
A high output option is available to extend the maximum
calibrated level to +19 dBm on the 2030 instrument.
An extended hysteresis facility allows for extended
electronic control of RF output level without introducing
mechanical attenuator transients when testing squelch systems.
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.
A choice of calibration units is available to the operator
and provision is made for the simple conversion of units
(for example, dBm to μν). Calibration data for the output
level is held in memory and may be altered from the front
panel or over the interface bus.
The output level can be offset by up to ±2 dB by keyboard
entry. Offsets from the calibrated value may be used to
compensate for cable or switching losses external to the
generator. This facility can be used as a means of
deliberately offsetting the output level to ensure that all
generators in an area give identical measurements. While
using the offsetting facility, the principal calibration of
the generator is not lost and may be returned to at any time.
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 accidently applied.
Comprehensive amplitude, frequency (plus wide bandwidth FM),
phase and optional pulse modulation are provided for testing
a wide range of receivers. An internal modulation oscillator
is provided, having a frequency range of 0.1 Hz to 500 kHz,
with a resolution of 0.1 Hz. A second modulation oscillator
can be included as an option. Two independent BNC inputs on
the front panel allow external modulation signals to be
mixed with the internal signal(s). Therefore, a maximum of
four modulation sources may be available at one time. These
sources may be combined to give the single, dual, composite
and dual composite modes.
The signalling facility allows testing of radio equipment
with sequential and sub-audible tone capability. The
sequential calling tone system is accessible from the
utility menu for all four modulation modes. Sub-audible
calling tones are specified within the modulation source
All major parameters can be incremented or decremented in
step sizes entered via keyboard entry or the GPIB. If no
step size is entered for a parameter, the steps are preset to
1 kHz for carrier frequency, 1 kHz for modulation oscillator
and LF frequency, 1 kHz for FM deviation, 1% for AM depth
and 1 dB for output level.
In addition the rotary control can be used to vary the
parameter with the sensitivity of the knob being changed by
means of the xlO and +10 keys.
The sweep capability of the 2030 Series allows comprehensive
testing of systems. Four parameters are used to specify
sweep; start, stop, number of steps and time per step. These
are specified by the user, with upper and lower limits for
the parameter values being dependent on the function. The
sweep markers menu is available by soft key selection on the
sweep display, allowing the placement of up to five user
The non-volatile memory allows 50 complete instrument
settings, 50 partial settings, 100 carrier frequency
settings, 20 sweep settings and 20 signalling tone sequences
to be stored for later use at any time.
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.
To prevent accidental interference with the contents of
internal memories, internal data is protected by a secure
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.
With an SSB phase noise performance at of typically -122 dB
c/Hz at 470 MHz (20 kHz offset), the 2030 Series can be used
for both in-channel and adjacent channel receiver
measurements. Harmonically related signals and non-harmonics
are better than -30 dBc and - 70 dBc respectively.
The 2030 Series has a recommended two year calibration
interval and is calibrated entirely by electronically
controlled adjustment. There are no internal mechanically
adjustable components to affect the calibration. The
calibration display is available via soft key selection at
the utilities menu.
After readjustment the instrument updates the calibration
data and records the date of adjustment. The calibration due
date can be set and when this date is reached a message
advises the operator to return the unit for calibration.