NI 9229 - Phase Matching Verification

NI 9229/9239 Calibration Procedure | © National Instruments | 7
b. Configure the AI voltage task timing according to Table 3.
c. Enable the function generator.
d. Start the task and wait for it to complete.
e. Calculate the amplitude for each reading and record the result as Amplitude
Acq
.
f. Disable the function generator.
g. Clear the task.
4. Perform the following calculation using the Amplitude
Acq
value.
5. Repeat step 4 for each channel.
6. Compare the channel-to-channel gain difference to the maximum limit of ±0.22 dB.
If the Gain Matching verification procedure determines that the NI 9229/9239 is outside of the
limits, refer to
Worldwide Support and Services for assistance in returning the device to NI.
Phase Matching Verification
Complete the following procedure to determine the As-Found status of the NI 9229/9239.
1. Connect the NI 9229/9239 to the function generator as shown in Figure 3.
Figure 3. Phase Matching Verification Connections
Table 8. NI 9229/9239 Timing Configuration
Sample Mode Samples Per Channel Rate
Finite Samples 25000 50000
Amplitude dB() 20
10
log×
Amplitude
Acq
9V
-----------------------------------






=
NI 9229/9239 with
Screw-Terminal
Function
Generator
HI
LO
AI1
–
+
AI0
–
+
AI2
–
+
AI3
–
+
NI 9229/9239
with BNC
Function
Generator
HI
LO
AI1
AI0
AI2
AI3
+
–
+
–
+
–
+
–