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PicoScope 4000 Series Programmer's Guide 73

4.10.50

ps4000SetSigGenArbitrary

PICO_STATUS ps4000SetSigGenArbitrary (

short handle,

long offsetVoltage,

unsigned long pkToPk,

unsigned long startDeltaPhase,

unsigned long stopDeltaPhase,

unsigned long deltaPhaseIncrement,

unsigned long dwellCount,

short * arbitraryWaveform,

long arbitraryWaveformSize,

SWEEP_TYPE sweepType,

PS4000_OPERATION_TYPES operationType,

INDEX_MODE indexMode,

unsigned long shots,

unsigned long sweeps,

SIGGEN_TRIG_TYPE triggerType,

SIGGEN_TRIG_SOURCE triggerSource,

short extInThreshold

)

This functions instructs the signal generator to produce an arbitrary waveform.

The arbitrary waveform generator uses direct digital synthesis (DDS). It maintains a

32-bit phase counter that indicates the present location in the waveform. The top 13

bits of the counter are used as an index into a buffer containing the arbitrary

waveform.

The generator steps through the waveform by adding a "delta phase" between 1 and

-1 to the phase counter every 50 ns. If the delta phase is constant, then the

generator produces a waveform at a constant frequency. It is also possible to sweep

the frequency by continually modifying the delta phase. This is done by setting up a

"delta phase increment" which is added to the delta phase at specified intervals.

Applicability

PicoScope 4226, 4227 and 4262 only

Arguments

handle, the handle of the required oscilloscope

offsetVoltage, the voltage offset, in microvolts, to be applied

to the waveform

pkToPk, the peak-to-peak voltage, in microvolts, of the waveform

signal

startDeltaPhase, the initial value added to the phase counter

as the generator begins to step through the waveform buffer

stopDeltaPhase, the final value added to the phase counter

before the generator restarts or reverses the sweep

deltaPhaseIncrement, the amount added to the delta phase

value every time the dwellCount period expires. This determines

the amount by which the generator sweeps the output frequency in

each dwell period.