National Instruments PXIe-5185, Manual

PXIe-5185/5186 Calibration Procedure 

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  © National Instruments 

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 19

2.

Configure the PXIe-5185/5186 with the following settings:

•

Vertical coupling

: DC

•

Input impedance

: 50 

Ω

•

Maximum input frequency

: 3 GHz (PXIe-5185), 5 GHz (PXIe-5186)

•

Range

: 0.11 V

pk-pk

•

Sample rate

: The 

Sample Rate

 value from Table 6 for the current iteration

•

Minimum number of samples

: 1,048,567

3.

Configure the signal generator to generate a sine waveform with the following 
characteristics:
•

Frequency

: the 

Test Point

 frequency value from Table 6

•

Amplitude level

: the 

Test Point

 amplitude value from Table 6

4.

Configure the power sensor to correct for the 

Test Point

 frequency using the power sensor 

frequency correction function.

5.

Use the power sensor to measure the power in dBm. Record the result as 

measured input 

power

.

6.

Calculate the 

corrected input power

 using the following equation:

corrected input power

 = 

measured input power

 + 

splitter imbalance

Note 

Select the 

splitter imbalance

 value from the list of test points from the 

Test 

System Characterization

 section for the current 

Test Point

 frequency from Table 6.

7.

Use the PXIe-5185/5186 to acquire and measure the power using the Extract Single Tone 
Information VI, converting the result from V

pk

 to dBm. Record the result as 

device input 

power

.

8.

If the 

Test Point

 frequency from Table 6 is 50 kHz, proceed to the following step. 

Otherwise, go to step 12.

9.

Calculate the 

power reference

 using the following equation:

power reference = device input power - corrected input power

10. Compare the power reference to the test limit for Iteration 1 in Table 6 to verify the 50 

Ω

AC amplitude accuracy.

11. Go to step 14. The power error is not calculated for this configuration.
12. Calculate the 

power error

 using the following equation: 

power error

 = 

device input power

 - 

corrected input power

 - 

power reference

13. Compare the power error to the test limit for Iteration 2 in Table 6 to verify the 50 

Ω

 analog 

bandwidth.

14. Repeat steps 2 through 13 for each 

Iteration

 in Table 6.

15. Connect splitter output 2 of the power sensor assembly to the channel 1 50 

Ω

 input of the 

PXIe-5185/5186 and repeat steps 2 through 13 for each 

Iteration

 listed in Table 6.