National Instruments PXIe-5172, Процедура калибровки, Страница: 16 / 38

Table 3. DC Accuracy Verification (Continued)
Config
Input
Impedance
(
Ω)
Vertical
Range
(V
pk-pk
)
Vertical
Offset
(V)
Test
Points
(V)
As-
Found
Limits
(mV)
As-Left
Limits
(mV)
Measurement
Uncertainty
(mV)
1
43 1 M 80 0 36.00 ±202.4 ±86.4 ±15.1
44 1 M 80 0 -36.00 ±202.4 ±86.4 ±15.1
1. Connect the calibrator test head via DC coupling to channel 0 of the PXIe-5172 using an
SMB (plug) to BNC (f) adapter.
2. Configure the PXIe-5172 with the following settings:
•
Input impedance: the Input Impedance value from the DC Accuracy Verification
table
• Maximum input frequency: 100 MHz
• Vertical offset: the Vertical Offset value from the DC Accuracy Verification table
• Vertical range: the Vertical Range value from the DC Accuracy Verification table
• Sample rate: 250 MS/s
• Minimum number of points: 2,500,000 samples
• NI-SCOPE scalar measurement: Voltage Average
3. Configure the calibrator output impedance to match the impedance of the PXIe-5172.
4. Configure the calibrator to output the Test Point value from the DC Accuracy Verification
table.
5. Enable the calibrator output.
6. Wait one second for settling, then record the measured voltage.
7. Use the following formula to calculate the voltage error:
DC voltage error = V
measured
- Test Point
8. Compare the voltage error to the appropriate limit from the DC Accuracy Verification
table.
9. Repeat steps 2 through 8 for each configuration listed in the DC Accuracy Verification
table.
10. Disable the calibrator output.
11. Connect the calibrator test head to channel 1 of the PXIe-5172 using an SMB (plug) to
BNC (f) adapter and repeat steps 2 through 8 for each configuration listed in the DC
Accuracy Verification table.
12. Disable the calibrator output.
1
Measurement uncertainty based on Fluke 9500B with Fluke 9530 test head specifications that
apply at T
cal
± 5 °C, where Factory T
cal
= 23 °C. Uncertainty of the 9500B includes long-term
stability of 1 year, temperature coefficient, linearity, load, and line regulation and traceability of
factory and National Calibration Standard.
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