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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
–
(
)
---------------------------------------------------------
1
–
100%
×