NI 5624R, Calibration Procedure

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NI PXIe-5624R Calibration Procedure

5.

Configure the NI 5624R with the following settings:
•

DDC mode

•

Center frequency: The first frequency listed in the 

NI 5624R Center Frequency (MHz) 

column in Table 3.

•

I/Q rate: 500 MHz

•

Dither: On (High)

6.

Configure the signal generator with the following settings: 
•

Frequency: The first frequency listed in the 

Generator Start Frequency (MHz) 

column 

in Table 3

•

Power level: 4 dBm

7.

Configure the power sensor to correct for the current frequency of the signal generator 
using the power sensor frequency correction function.

8.

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

measured input power

.

Note

Power sensor readings are in dBm, not watts.

9.

Calculate the 

corrected input power

 using the following equation:

corrected input power 

= 

measured input power

 + 

splitter balance

Tip

Find the splitter balance by using the appropriate data points from the 

Characterizing Power Splitter Balance

 section.

10. Perform an acquisition and measure the tone present at the frequency generated by the 

signal generator. 

11. Calculate the 

absolute amplitude accuracy

 using the following equation:

absolute amplitude accuracy = NI 5624R input power – corrected input power 

Table 3.  

Configured Center Frequencies

NI 5624R Center 

Frequency (MHz)

Generator Start 

Frequency (MHz)

Generator Stop 

Frequency (MHz)

Step Size (MHz)

225

25

425

5

500

300

700

5

800

600

995

5

1200

1005

1400

5

1500

1300

1700

5

1800

1600

1975

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