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6 Advanced Source, Measurement, and Control
Specify a Window Function
Windowing is a signal conditioning process that reduces the error in average measurements made in
the presence of periodic signals and noise. Two window functions are available: Rectangular and
Hanning. At power-on, the measurement window is Rectangular.
The Rectangular window calculates average measurements without any signal conditioning.
However, in the presence of periodic signals such AC line ripple, a Rectangular window can introduce
errors when calculating average measurements. This can occur when a non-integral number of cycles
of data has been acquired due to the last partial cycle of acquired data.
One way of dealing with AC line ripple is to use a Hanning window. The Hanning window applies a cos4
weighting function to the data when calculating average measurements. This attenuates the AC noise
in the measurement window. The best attenuation is achieved when at least three or more waveform
cycles are in the measurement.
To select the Hanning window function, use:
SENS:WIND HANN,(@1)
Select the Measurement Trigger Source
A TRIGger:ACQuire[:IMMediate] command over the bus will always generate an
immediate measurement trigger, regardless of the selected trigger source.
Unless you are using a TRIGger:ACQuire command to trigger the measurement, select a trigger
source from the following:
BUS
Selects GPIB device trigger, *TRG, or <GET> (Group Execute Trigger)
CURRent<1-4>
Triggers the measurement when the current of the corresponding output passes through the specified level.
EXTernal
Selects the trigger input BNC connector. Requires a low-true trigger signal.
PIN<1-7>
Selects a specific pin that is configured as a Trigger Input on the digital port. The selected pin must be configured as a
Trigger Input in order to be used as a trigger source (see
TRANsient<1-4>
Selects the specified output channel's transient system as the trigger source.
VOLTage<1-4>
Triggers the measurement when the voltage of the corresponding output passes through the specified level.
Use the following commands to select a trigger source. To select Bus triggers for output 1:
TRIG:ACQ:SOUR BUS,(@1)
To select Digital pin triggers, where n is the pin number that will generate the trigger:
TRIG:ACQ:SOUR PIN<n>,(@1)
To select a Transient output as trigger, where n is the output channel that will generate the trigger
signal:
TRIG:ACQ:SOUR TRAN<n>,(@1)
214
Using the Digital
Port).
Keysight N6705C User's Guide
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