NI PXIe-4480/4481 Calibration Procedure
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© National Instruments
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17
10. If necessary, repeat steps 1 through 9 for all input channels of the device. In step 1, connect
the output of the calibrator to the channel being verified. In step 3, replace
ai0
in the
physical channel
parameter with the channel being verified.
Charge Input Performance Verification (PXIe-4480 only)
This section verifies the charge input performance of the PXIe-4480.
Charge Gain Accuracy Verification
Complete the following steps to verify the charge gain accuracy.
1.
Using the equipment described in Table 1, connect analog input channel 0 of the module to
the calibrator as shown in Figure 4. Record the exact value of the calibrator capacitor,
which is printed on its label or provided on its calibration certificate. In this procedure, this
value is termed C
CAL
.
2.
Configure the calibrator to generate an output with the amplitude and frequency listed in
the 20,000 pC row of Table 10.
Note
While the calibrator output is voltage, its application through the series
calibration capacitor creates an effective charge input (Q
CAL
= V
CAL
* C
CAL
). For
example, 6.3 V
rms
applied through 1000 pF creates a charge input of 6300 pC
rms
.
Table 9.
Voltage Gain Flatness Limits
Calibrator
Output
Frequency
(Hz)
Test Limit
(10 V, 5 V ranges)
Test Limit
(1 V range)
Test Limit
(0.5 V range)
Lower
Limit
(V
rms
)
Upper
Limit
(V
rms
)
Lower
Limit
(V
rms
)
Upper
Limit
(V
rms
)
Lower
Limit
(V
rms
)
Upper
Limit
(V
rms
)
40
0.9992 *
V
1kHz
1.0008 *
V
1kHz
0.9992 *
V
1kHz
1.0008 *
V
1kHz
0.9991 *
V
1kHz
1.0009 *
V
1kHz
20,000
0.9992 *
V
1kHz
1.0008 *
V
1kHz
0.9992 *
V
1kHz
1.0008 *
V
1kHz
0.9991 *
V
1kHz
1.0009 *
V
1kHz
50,000
0.9985 *
V
1kHz
1.0015 *
V
1kHz
0.9982 *
V
1kHz
1.0018 *
V
1kHz
0.9971 *
V
1kHz
1.0029 *
V
1kHz
100,000
0.9965 *
V
1kHz
1.0035 *
V
1kHz
0.9935 *
V
1kHz
1.0066 *
V
1kHz
0.9892 *
V
1kHz
1.0109 *
V
1kHz
200,000
0.9874 *
V
1kHz
1.0127 *
V
1kHz
0.9750 *
V
1kHz
1.0257 *
V
1kHz
0.9594 *
V
1kHz
1.0423 *
V
1kHz