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NI PXIe-5601 Calibration Procedure
29. The array from step 28 contains absolute gain data centered about the IF center frequency.
Normalize this array to the gain at the IF center frequency. The normalized gain at the
center point of the array is 0 dB and reverses the array.
30. Record the normalized gain array from step 29 in the NI 5601 EEPROM using the niRFSA
Cal Adjust IF Response Calibration VI or the
niRFSA_CalAdjustIFResponseCalibration
function.
You must provide the following information:
•
IF filter
•
Bandwidth—Shown in Tables 27 or 28, depending on the module revision of your
NI 5601.
•
RF frequency used for the measurements
•
Normalized gain array computed from step 29
31. Repeat steps 14 to 30 for all the
IF Filters
listed in Table 23 or 24, corresponding to the
module revision of your NI 5601.
Note
NI recommends keeping your RF signal generator enabled when repeating
steps unless making a connection change. Keeping the signal generator enabled
reduces the wear on the RF signal generator relays. After making a connection
change and enabling your generator, wait 5 seconds for the system to settle.
32. Close the NI 5601 IF Response Calibration step using the
niRFSA Close Calibration Step VI or the
niRFSA_CloseCalibrationStep
function.
33. Close the external calibration by calling the niRFSA Close Ext Cal VI with the
action
parameter set to
Commit
or by calling the
niRFSA_CloseExtCal
function with the
action
parameter set to
NIRFSA_VAL_EXT_CAL_COMMIT
.
34. Close the niRFSG session using the niRFSG Close VI or the
niRFSG_close
function.
Table 27.
NI 5601 Bandwidth (NI 5601 Prior to Module Revision G)
IF Filter Value
Bandwidth
187.5 MHz, Wide
180 MHz
187.5 MHz, Narrow
80 MHz
53 MHz
60 MHz
Table 28.
NI 5601 Bandwidth (NI 5601 Module Revision G and Later)
IF Filter Value
Bandwidth
187.5 MHz, Wide
240 MHz
187.5 MHz, Narrow
80 MHz
53 MHz
104 MHz
