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NI PXIe-4610 Calibration Procedure
13. Convert the unadjusted gain to decibels.
14. Disable the NI PXIe-4610 outputs.
15. Disable the function generator.
16. Read the gain constant of the channel being verified with the AO.PowerAmp.Gain DAQmx
property and convert the gain to decibels.
17. Perform the following calculation using the
UnadjustedGain (dB)
calculated in step 13 and
the
CalibrationGain (dB)
calculated in step 16, and record the result as
AdjustedGain (dB)
.
18. Repeat steps 1 through 17 for each channel.
19. Compare the recorded
UnadjustedGain (dB)
and
AdjustedGain (dB)
of each channel to the
limits in Table 4.
Note
The test limits listed are derived using the values in Table 7.
20. Compare the recorded residual offset for each channel to the limits in Table 5.
Note
The test limits listed are derived using the values in Table 8.
If the NI PXIe-4610 is outside the limits found in Tables 4 and 5, refer to
for assistance in returning the device to NI.
Table 4.
NI PXIe-4610 2-Year Verification Test Limits for Gain
Input Signal Source
Lower Limit (dB)
Upper Limit (dB)
Unadjusted
19.969
20.031
Adjusted*
19.989
20.011
*
Input signal source gain adjusted using the gain calibration constant stored in the EEPROM.
Table 5.
NI PXIe-4610 2-Year Verification Test Limits for Residual Offset
Lower Limit (mV)
Upper Limit (mV)
-1
+1
UnadjustedGain (dB)
20 log
⋅
(UnadjustedGain)
=
CalibrationGain (dB)
20 log
⋅
GainEEPROM
(
)
=
AdjustedGain (dB)
20 dB
(UnadjustedGain (dB) - CalibrationGain (dB))
+
=