National Instruments PXIe-5172, Процедура калибровки, Страница: 31 / 38

1. Connect the calibrator test head 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: 50 Ω
• Maximum input frequency: 100 MHz
• Vertical range: 1.4 V
pk-pk
• Sample rate: 250 MS/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 1.25 V
pk-pk
• Frequency: 89 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
- (89 × 10
6
))/89
7. Compare the timebase error to the appropriate limit from the Timebase Accuracy
Verification table.
Note Timebase verification is only required on one channel.
8. Disable the calibrator output.
Verifying RMS Noise
Follow this procedure to verify the RMS noise of the PXIe-5172 using a 50 Ω terminator.
Table 8. RMS Noise Verification
Config
Input
Impedance (
Ω)
Vertical
Range
(V
pk-pk
)
Max Input
Frequency
(MHz)
Test Limit
(% of FS)
Measurement
Uncertainty
(% of FS)
1 50 0.2 100 0.045 ±1.13E-3
2 50 0.7 100 0.018 ±387E-6
3 50 1.4 100 0.018 ±256E-6
4 50 5 100 0.018 ±185E-6
stability of 1 year (5 years for frequency), temperature coefficient, linearity, load, and line
regulation and traceability of factory and National Calibration Standard.
PXIe-5172 Calibration Procedure | © National Instruments | 31