Front Panel Menu Reference
SCPI Command
Select Measure\NPLC
Select Measure\Sweep
Enter the number of power line cycles in the NPLC field. Then press Select.
To set the number of power line
cycles to 10 use:
The AC line frequency is detected automatically for the SENSe:SWEep:NPLC
command.
Measurement Windowing
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.
Front Panel Menu Reference
SCPI Command
Select Measure\Window.
Select either Rectangular or Hanning. Then press Select.
To set the sense window to Hanning use:
Seamless Current Measurement Ranging
Keysight N7900 models have two current measurement ranges, a high and a low range (see
).A seamless current ranging function ensures that no data is lost due to range
switching. Seamless ranging is enabled by default. The commands to enable seamless current
measurement ranging are:
Front Panel Menu Reference
SCPI Command
Select Measure\Range.
Select Auto to enable seamless measurement ranging.
Then press Select.
To enable seamless measurement ranging:
You can also manually select the lower (or high) current measurement range. The lower current
measurement range provides greater measurement accuracy, provided that the measurement does
not exceed the range. If the measurement exceeds the range, an “Overload” error will occur. Use the
following commands to select the low current measurement range.
Keysight N6900/N7900 Series Operating and Service Guide
133
4 Using the Advanced Power System
Содержание N6900 Series
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