NI 9227 Calibration Procedure
|
© National Instruments
|
7
2.
Configure function generator according to Table 5.
3.
Enable the function generator.
4.
Acquire samples.
a.
Create and configure an AI current task according to Table 6.
b.
Configure the task timing according to Table 7.
c.
Start the task.
d.
Read samples from the NI 9227. Record the amplitude of the waveform as
Amplitude
Acq
for each channel.
e.
Clear the task.
5.
Perform the following calculation for each channel using the
Amplitude
Acq
value to
calculate the gain for each channel.
6.
Compare the channel-to-channel gain difference to the maximum limit of ±0.13 dB.
7.
Disable the function generator.
8.
Disconnect the calibrator from the device.
If the Gain Matching verification procedure determines that the NI 9227 is outside of the limits,
refer to
Worldwide Support and Services
for assistance in returning the device to NI.
Table 5.
Function Generator Configuration for Gain Matching Verification
Signal Type
Amplitude (VPK)
Frequency (kHz)
Sinewave
9
20
Table 6.
NI 9227 Configuration for Gain Matching Verification
Physical Channels
Terminal Configuration
AI0:3
Differential
Table 7.
NI 9227 Configuration for Gain Matching Verification
Sample Mode
Samples Per Channel
Rate (kS/s)
Finite Samples
25000
50
Amplitude dB
(
)
20 log
10
×
Amplitude
Acq
90
mA
-----------------------------------
=
