10
|
ni.com
|
NI PXIe-5653 Calibration Procedure
Verifying LO1 Amplitude Accuracy
This verification ensures that the internal LO1 circuitry is adjusted for correct amplitude
accuracy. Complete the following procedure to determine the as-found status of the NI 5653.
1.
Connect the NI 5653 LO1 front panel connector to the power meter.
2.
Create a new device session for the NI 5653.
3.
Create a list of test frequencies from 3.2 GHz to 8.3 GHz in 100 MHz increments, including
endpoints.
4.
Calculate the expected output power,
P
Expected
, for each frequency using the following
formulas.
For all frequencies from 3.2 GHz to 8.2 GHz:
For the frequency 8.3 GHz:
P
Expected
= 6.5 dBm
5.
Set the RF frequency to the first value of the frequency array you created in step 3 and
commit the settings to hardware.
6.
Check the signal generation status and verify that there are no reported errors or warnings.
7.
After correcting for the measurement frequency, use the power meter to measure the
NI 5653 LO1 front panel connector power.
8.
Calculate the power deviation,
P
Deviation
, using the following formula:
9.
Repeat steps 5 through 8 for each point in the frequency array you created in step 3.
10. Verify that the power deviation results calculated in step 9 for each point are within ±2.5 dB
for LO1.
11. Close the device session.
Verifying LO2 Amplitude Accuracy
This verification ensures that the internal LO2 circuitry is adjusted for correct amplitude
accuracy. Complete the following procedure to determine the as-found status of the NI 5653.
1.
Connect the NI 5653 LO2 front panel connector to the power meter.
2.
Create a new device session for the NI 5653.
3.
Set the RF frequency to 4 GHz and commit the settings to hardware.
4.
Check the signal generation status and verify that there are no reported errors or warnings.
5.
After correcting for the measurement frequency, use the power meter to measure the LO2
output power.
6.
Ensure that the output power is between 6.5 dBm and 13 dBm.
7.
Close the device session.
P
Expected
10.5 3
frequency GHz
(
)
3.2
GHz
–
5.0
GHz
---------------------------------------------------------------------
dBm
(
)
–
=
P
Deviation
dB
(
)
P
Measured
dBm
(
)
P
Expected
dBm
(
)
–
=
