SCPI Programming Reference
HDG2000 Series Arbitrary Waveform Generator
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5.2.3 BPSK Subsystem
The BPSK subsystem allows you to modulate a wave form with Binary Phase Shift Keying (BPSK),
a digital modulation format. In BPSK, the carrier waveform is phase shifted between two phase
settings using an on/off keying. The source may be internal, using a square wave at a specified
frequency, or external, using the external trigger input.
SOURce<n>:MOD:BPSKey:INTernal:RATE <frequency>|MINimum|MAXimum
SOURce<n>:MOD:BPSKey:INTernal:RATE? [MINimum|MAXimum]
Sets the rate at which the output phase "shifts" between the carrier and offset phase.
Parameter
Typical Return
2 mHz to 1 MHz, default 100Hz
+2.00000000002
Set BPSK rate to 200Hz: SOURce1:MOD:BPSKey:INTernal:RATE 200
The BPSK rate is used
only
when the
INTernal
source is selected (
BPSK:SOURce INTernal
)
and is ignored when the EXTernal source is selected (
BPSK:SOURce EXTernal
).
The internal modulating waveform is a square wave with a 50% duty cycle.
SOURce<n>:MOD:BPSKey:PHASe <phase>|MINimum|MAXimum
SOURce<n>:MOD:BPSKey:PHASe ? [MINimum|MAXimum]
Sets the Binary Phase Shift Keying phase shift in degrees.
Parameter
Typical Return
0to 360 degrees, default 180 degrees
+0.000000000000000E-00
Set phase shift to 90 degrees: SOURce1:MOD:BPSKey:PHASe 90
5.2.4 BURSt Subsystem
This section describes the BURSt subsystem.
Burst Modes
There are two burst modes, described below. The instrument enables one burst mode at a time.
Triggered Burst Mode (default):
The instrument outputs a waveform for a number of cycles
(burst count) each time a trigger is received. After outputting the specified number of cycles, the
instrument stops and waits for the next trigger. You can configure the instrument to use an
internal trigger to initiate the burst or you can provide an external trigger by pressing the
front-panel
[Trig Menu]
key, by applying a trigger signal to the front-panel
TRIG
connector, or
by sending a software trigger command from the remote interface.
External Gated Burst Mode:
The instrument output is either "on" or "off" based on the level of
the external signal applied to the front-panel
TRIG
connector. When this signal is true, the
instrument outputs a continuous waveform. When this signal goes false, the current waveform
cycle is completed and then the instrument stops while remaining at the voltage corresponding