15. Repeat steps 2 through 14 for each configuration in the
Flatness and Bandwidth Verification
table.
16. Connect the splitter output 2 of the power sensor assembly from the
section to channel 1 of the PXIe-5164. Repeat steps 2 through 14 for
each configuration in the
1 MΩ Passband Amplitude Flatness and Bandwidth Verification
table.
17. Disable the signal generator output.
Verifying Timebase Accuracy
Follow this procedure to verify the frequency accuracy of the PXIe-5164 onboard timebase
using an oscilloscope calibrator.
Table 7. Timebase Accuracy Verification
As-Found Limits
As-Left Limits
Measurement Uncertainty
±5.0 PPM (±495 Hz)
±1.0 PPM (±99 Hz)
±0.2 PPM (±19.8 Hz)
1.
Connect the calibrator test head to channel 0 of the PXIe-5164.
2.
Configure the PXIe-5164 with the following settings:
•
Input impedance: 50 Ω
•
Maximum input frequency: 400 MHz
•
Vertical range: 1 V
pk-pk
•
Sample rate: 1 GS/s
•
Minimum number of points: 1,048,576 samples
3.
Configure the calibrator and generate a waveform with the following characteristics:
•
Waveform: Sine wave
•
Amplitude (V
pk-pk
): 0.9 V
•
Frequency: 99 MHz
•
Load impedance: 50 Ω
4.
Enable the calibrator output.
5.
Wait 1 second for settling, then measure and record the peak frequency using the Extract
Single Tone Information VI.
6.
Calculate the timebase error using the following formula:
Timebase error
= (
F
measured
- (99 × 10
6
))/99
7.
Compare the timebase error to the appropriate limit from the
Note
Timebase verification is only required on one channel.
5
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 (5 years for frequency), temperature coefficient, linearity, load, and line
regulation and traceability of factory and National Calibration Standard.
40
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PXIe-5164 Calibration Procedure
