National Instruments PXIe-5172, Процедура калибровки, Страница: 29 / 38

• Averaging resolution: 4 (0.001 dB)
• Aperture: 20 ms
3. Configure the PXIe-5172 with the following settings:
•
Input impedance: 1 MΩ
• Maximum input frequency: 100 MHz
• Vertical offset: 0 V
• Vertical range: the Vertical Range value from the 1 MΩ Bandwidth Verification table
• Minimum number of points: 1,048,576 samples
4. Configure the signal generator to generate a sine waveform with the following
characteristics into a 50 Ω load:
•
Frequency: the Test Point Frequency value from the 1 MΩ Bandwidth Verification
table
• Amplitude: the Test Point Amplitude value from the 1 MΩ Bandwidth Verification
table plus splitter loss
Note
Select the splitter loss value from the list of test points from the Test
System Characterization section for the current Test Point Frequency.
5. Configure the power sensor to correct for the Test Point Frequency using the power
sensor frequency correction function.
6. Wait 0.1 second for settling.
7. Use the power sensor to measure the power in dBm. Record the result as measured input
power .
8. Calculate the corrected input power using the following equation:
corrected input power = measured input power + splitter balance
Note
Select the splitter balance value from the list of test points from the Test
System Characterization section for the current Test Point Frequency.
9. Use the PXIe-5172 to acquire and measure the power using the Extract Single Tone
Information VI, converting the result from Vpk to dBm. Record the result as
device input
power .
10. If the Test Point Frequency value from the 1 MΩ Bandwidth Verification table is 50 kHz,
proceed to the following step. Otherwise, go to step 13.
11. Calculate the power reference using the following equation:
power reference = device input power - corrected input power
12. Go to step 15. The power error is not calculated for this configuration.
13. Calculate the
power error using the following equation:
power error = device input power - corrected input power - power reference
14. Compare the power error to the appropriate Limit from the 1 MΩ Bandwidth Verification
table.
15. Repeat steps 3 through 14 for each configuration in the 1 MΩ Bandwidth Verification
table.
16. Disable the signal generator output.
PXIe-5172 Calibration Procedure | © National Instruments | 29