44 | ni.com | NI VirtualBench Calibration Procedure
4. (VB-8012) Disconnect the 50 Ω terminator
5. Connect Channel 1 of the oscilloscope to Channel 0 of the function generator with the
BNC-to-SMB cable, as shown in Figure 24.
Figure 24. Oscilloscope Channel 1-to-Function Generator Connection Diagram
6. Call MSO Get Compensator Attenuation Calibration Adjustment Points.
This will return three arrays:
• Range—A numerical array specifying the range being calibrated
• Amplitude—A numerical array specifying the square wave amplitude required for
calibration (V
pk-pk
)
• Frequency—A numerical array specifying the frequency of the calibration square
wave
Note Configure the function generator for high impedance loads.
7. Use the function generator to generate a square wave with the offset set to zero and duty
cycle set to 50%; the frequency and amplitude are supplied from the output of MSO Get
Compensator Attenuation Calibration Adjustment Points.
8. Wait 100 milliseconds.
9. Call
MSO Adjust Compensator Attenuation Calibration with the following
parameters:
• Channel—
mso/1
• Range—Supplied from the output of MSO Get Compensator Attenuation Calibration
Adjustment Points
1 VirtualBench Oscilloscope 2 Function Generator 3 BNC-to-SMB Cable
CH 0
1
3
PFI 0
PFI 1
ACCESS ACTIV E
CLK
IN
DIGITAL DATA & CONTROL
2
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