NI 9225 Calibration Procedure
|
© National Instruments
|
7
3.
Enable the function generator.
4.
Acquire samples.
a.
Create and configure an AI voltage according to Table 6.
b.
Configure the task timing according to Table 7.
c.
Start the task.
d.
Read samples from the NI 9225. Record this measurement as
Amplitude
Acq
for each
channel. NI recommends using the Extract Single Tone Information VI to determine
the amplitude.
e.
Stop the task.
f.
Clear the task.
5.
Calculate the gain for each channel using the
Amplitude
Acq
value.
6.
Compare the channel-to-channel gain difference to the maximum limit of ±0.25 dB.
7.
Disable the function generator.
8.
Disconnect the function generator from the device.
If the Gain Matching verification procedure determines that the NI 9225 is outside of the limits,
refer to
for assistance in returning the device to NI.
Table 6.
NI 9225 Configuration Task for Gain Matching Verification
Physical Channels
Terminal Configuration
AI0:2
Differential
Table 7.
NI 9225 Configuration Task for Gain Matching Verification
Sample Mode
Samples Per Channel
Rate (kS/s)
Finite Samples
25000
50
Amplitude dB
(
)
20 log
10
×
Amplitude
Acq
9
V
-----------------------------------
=