38 | ni.com | NI VirtualBench Calibration Procedure
4. Call MSO Configure Analog Channel with the following parameters:
• Enable Channel =
TRUE
• Channel = mso/1
• Vertical Coupling = DC
• Probe Attenuation = 1x
• Vertical Range = 20
• Vertical Offset = -18
5. Set the oscilloscope calibrator DC voltage output to the programmed vertical offset,
or -18 V for this iteration.
6. Wait at least 5 seconds for the oscilloscope calibrator and DUT to settle.
7. Call
MSO Run.
8. Call
MSO Read. Calculate and record the average analog waveform. Save this value as
V
meas_neg
.
9. Call
MSO Stop.
10. Call
MSO Configure Analog Channel with the following parameters:
• Enable Channel =
TRUE
• Channel = mso/1
• Vertical Coupling = DC
• Probe Attenuation = 1x
• Vertical Range = 20
• Vertical Offset = 18
11. Set the oscilloscope calibrator DC voltage output to the programmed vertical offset, or
+18 V for this iteration.
12. Wait at least 5 seconds for the oscilloscope calibrator and DUT to settle.
13. Call
MSO Run.
14. Call
MSO Read. Calculate and record the average analog waveform. Save this value as
V
meas_pos
.
15. Call
MSO Stop.
16. Calculate the gain error as follows:
Where V
pos
and V
neg
are listed in Table 15.
Verify that this calculation falls within the limits in Table 15.
V
meas_pos
V
meas_neg
–()
V
pos
V
neg
–()
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