Filter
Top Products
GENERAL INFORMATION
1-2
the internal signal(s). These sources can be combined to give a number of modulation modes. The
pulse modulation can be used in combination with the other forms of modulation.
The frequency modulation range provides a 1 dB bandwidth of typically 100 kHz and provides FM
deviation up to a maximum of 100 kHz. AC or DC coupled FM can be selected. Phase
modulation is also available with a 10 kHz bandwidth up to a maximum of 10 radians.
Amplitude modulation with a 1 dB bandwidth of typically 30 kHz and with modulation depths of
up to 99.9% is available with a resolution of 0.1%. Pulse modulation is available as standard with
typical rise and fall times of less than 10 µs and 40 dB on/off ratio.
The external input voltage required for 100% modulation is 1 V RMS (1.414 V peak). To
accommodate other signal levels, Automatic Level Control (ALC) can be selected which provides
correctly calibrated modulation for inputs between 0.75 and 1.25 V RMS. HI and LO indications
are reported when the input level is outside the range of the ALC system.
Incrementing
All major parameters can be incremented or decremented in steps. If no step size is programmed
for a parameter, the steps are preset to 1 kHz for carrier frequency, 1 kHz for modulation oscillator,
1 kHz for FM deviation, 1% for AM depth, 0.1 rad for
ΦM and 1 dB for output level.
Frequency sweep
The sweep capability of the instrument allows comprehensive testing of systems. Sweeps may be
logarithmic or linear. Four parameters are used to specify sweep: start, stop, step size and time per
step, all of which can be programmed by the user. Sweep triggering can be programmed as single
shot or continuous and can be initiated directly or on the detection of a trigger. The triggering
signal may be from a back plane trigger, programmed or from a TTL/CMOS signal applied to the
front panel TRIGGER INPUT.
Memory
The instrument provides both non-volatile and volatile memory for storing instrument settings.
The non-volatile memory provides 100 instrument settings and 100 settings of carrier frequency
only. The volatile memory (RAM) also provides 100 instrument settings. Any one of the non-
volatile instrument settings can be selected as the power-up setting for the instrument.
Memory sequencing
A software facility allows sequences of stored instrument settings to be defined. The incrementing
facilities can then be used to cycle through the settings using the VXI trigger facilities.
Memory protection
To prevent accidental change of the contents of the stored settings, individual memories or ranges
of memories can be write-protected.
Triggers
Triggering the 3002 Signal Generator may be via the VXI TTL triggers (0 - 7), the trigger
command, *TRG message or front panel input.
Calibration data
All alignment data is digitally derived. Realignment can be undertaken, without removing covers,
by protected functions via the VXI interface.