Option
Description
NI-SCOPE
Call Probe Compensation Signal Start.
4.
In InstrumentStudio, configure the settings of the input channel to which you connected
the probe.
a)
Set the channel to
On
to display the signal.
b)
Set the
Input impedance
of the channel to
1 MΩ
.
c)
Match the
Probe attenuation
setting to the setting on your probe.
5.
Adjust the vertical range on the input channel until the signal starts to clip and then
increase the vertical range by one step so that it no longer clips.
This process ensures you are using the maximum dynamic range of the ADC.
6.
Examine the digitized signal and adjust the tunable capacitor on the probe.
The probe is correctly compensated when the waveform appears as square as possible:
Probe Adjustment Signal
Probe Adjustment Signal
Probe Adjustment Signal
Compensated Correctly
Undercompensated
Overcompensated
Proper Amplitude of a
1 MHz Test Signal
Reduced Amplitude of a
1 MHz Test Signal
Increased Amplitude of a
1 MHz Test Signal
Once compensated, the probe conveys signals to the input channel accurately, without
artificially attenuating or amplifying frequency components of the signal.
Tip
For the most accurate measurements:
•
Compensate probes for each channel of the oscilloscope;
•
Use a compensated probe only with the channel you used to compensate it; and
•
Compensate your probes frequently.
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PXIe-5160/5162 Getting Started Guide
