Datasheet

Features in detail
USB Flash Drive Interface
Both instruments incorporate a front mounted USB
socket for connection of flash memory disk drives which
can store up to 1,000 waveforms and 1,000 setups.
Unlimited Waveform Storage
These drives can be used both to store waveforms permanently and to
transfer waveforms from or to a PC.
Arbitrary waveform storage within the instrument is limited to four
waveforms. Each flash drive can store up to 1000 waveforms which can
be accessed using the instruments file handling utilities.
Storage of Instrument Set-ups
Up to nine complete set-ups of the instrument can be stored within its
own non-volatile memory. Up to 1000 further set-ups can be stored on
each flash drive.
PRBS Waveforms
A PRBS (Pseudo-Random Bit Sequence) is a binary
waveform with a sequence that is almost impossible
to predict. PRBS waveforms are used within secure
communications systems.
A PRBS is generated by a linear-feedback shift register with taps that generate
a feedback signal via an exclusive-OR gate. The number of stages determines
the sequence length (2
N
-1) whilst the clock frequency determines the bit rate.
The stage length can be set to 7, 9, 11, 15, 20, or 23, resulting in sequence
lengths from 127 to 8,388,607 bits at rates between 1µbps to 50Mbps. Edges
have variable rise and fall as per pulse waveforms.
The PRBS waveform can be used as both a carrier and a modulator.
Digital Modulation, Internal & External
The generators offer a comprehensive set of digitally
based modulations.
The internal modulation source can use any of the
standard or arbitrary waveforms currently within
the generator (including noise) thus removing the need for an external
modulation source. A modulating frequency between 1µHz and 1MHz
can be specified.
An external modulation input enables any external waveform source to
be used when required. The external bandwidth is DC to 20kHz.
AM, FM and PM
Sine, square, ramp or arbitrary waveforms can be modulated using
amplitude, frequency or phase modulation.
Amplitude depth is variable from 0.0% to 120.0%, frequency deviation
from zero to Fmax/2, and phase deviation from -360.0 to +360.0 degrees.
PWM
Pulse width modulation is available for the pulse function using any
standard or arbitrary waveform including noise. Pulse width deviation is
variable between 0% and 100%.
Sum
Sum modulation adds the modulating waveform to the carrier. It can be
used with Sine, Ramp and Arbitrary carrier waveforms along with any
modulating waveform.
FSK and BPSK
Frequency shift keying between any two frequencies is available for sine,
square, ramp or arbitrary waveforms using the internal trigger generator
or an external trigger signal.
The internal trigger generator is variable between 2mHz and 1MHz with
nine digit resolution.
BPSK (Binary Phase Shift Keying) is similar to FSK but it is the carrier’s
phase, rather than its frequency, that switches between two values. It has
advantages in terms of bandwidth used.
PRBS
A PRBS waveform can be used as a modulating waveform at bit rates
between 1ubps to 1Mbps.
Sweep and Burst
Sweep, Burst and Gated modes of operation are
available using either an external trigger signal or the
internal trigger generator.
Wide range Frequency Sweep
Phase continuous sweep is available for all standard and arbitrary
waveforms except for pulse. The sweep range is from 1µHz through
to the maximum for the chosen carrier waveform. Start and stop
frequencies can be set independently.
The sweep can be linear or logarithmic, triggered or continuous with
a period between 1ms and 500s. The sweep trigger can be manual or
internal from the trigger generator or external from the trigger socket or
from a remote interface command.
A marker is provided that outputs an edge synchronous with any
frequency point within the sweep.
Triggered Burst
In Burst mode, each active edge of the trigger will produce one burst of
the waveform.
The number of cycles in a burst can be set between 1 and 16,777,215 (or
infinite). The burst starts and ends at a waveform phase angle settable
between -360.0 to +360.0 degrees.
Trigger signal
The trigger signal can be manual from the front panel key, internal from
the internal trigger generator, external from the trigger-in socket, or
remote via a bus command.
The trigger-in socket has a nominal TTL threshold and can be set to +ve
edge or -ve edge triggering. The minimum trigger pulse width is 50ns.
The internal trigger generator is variable between 2mHz and 1MHz with 9
digit resolution.
Storage, Modulations, Sweep & Burst