Table 4.
DC Accuracy Verification
Config
Bandwidth
Vertical
Range
(V
pk-pk
)
Test
Points
(V)
As-Found
Test Limit
(mV)
As-Left
Test
Limit
(mV)
Measurement
Uncertainty
(mV)
2
1
Full Bandwidth
0.2
0.09
±2.8
±1.58
±0.08
2
Full Bandwidth
0.2
-0.09
±2.8
±1.58
±0.08
3
Full Bandwidth
0.4
0.18
±3.1
±1.13
±0.15
4
Full Bandwidth
0.4
-0.18
±3.1
±1.13
±0.15
5
Full Bandwidth
1
0.45
±6.8
±1.83
±0.19
6
Full Bandwidth
1
-0.45
±6.8
±1.83
±0.19
7
Full Bandwidth
2
0.90
±11.1
±3.26
±0.57
8
Full Bandwidth
2
-0.90
±11.1
±3.26
±0.57
9
Full Bandwidth
5
2.25
±25.6
±7.15
±0.61
10
Full Bandwidth
5
-2.25
±25.6
±7.15
±0.61
1.
Connect the SMA (m)-to-BNC (f) adapter to channel 0 of the NI 5170R.
2.
Connect the calibrator test head to the SMA (m)-to-BNC (f) adapter.
3.
Configure the NI 5170R with the following settings:
•
Bandwidth: the Bandwidth value from the
DC Accuracy Verification
table
•
Vertical range: the Vertical Range value from the
DC Accuracy Verification
table
•
Sample rate: 250 MS/s
•
Number of samples: 1,048,576 samples
4.
Configure the calibrator output impedance to 50 Ω.
5.
Configure the calibrator to output the Test Point value from the
DC Accuracy Verification
table.
6.
Enable the calibrator output.
7.
Wait 1 second for settling, then compute the average of the samples acquired and record
the measured voltage.
8.
Use the following formula to calculate the voltage error:
DC voltage error
=
V
measured
- Test Point
9.
Compare the voltage error to the appropriate limit from the
DC Accuracy Verification
table.
10. Repeat steps 3 through 9 for each configuration listed in the
DC Accuracy Verification
table.
NI PXIe-5170R Calibration Procedure
|
© National Instruments
|
13
