National Instruments NI 9234, Процедура калибровки, Страница: 10 / 17

NI 9234 Calibration Procedure
|
© National Instruments
|
9
e. Disable the function generator.
f. Clear the task.
5. Calculate the phase for each channel on the NI 9234. NI recommends using the Extract
Single Tone Information VI to calculate phase.
6. Compare the channel-to-channel phase difference to the limits in Table 10.
7. Repeat steps 2 through 6 for each test point in Table 10.
If the Phase Matching verification procedure determines that the NI 9234 is outside of the limits,
refer to
Worldwide Support and Services
for assistance in returning the device to NI.
Common-Mode Rejection Ratio Verification
Complete the following procedure to determine the As-Found status of the NI 9234.
1. Connect the NI 9234 to the function generator and short the positive pin and negative shell
of the NI 9234 channel.
2. Connect the function generator to the chassis ground as shown in Figure 4.
Figure 4.
CMRR Verification Connections to the NI 9234
3. Configure the function generator according to Table 11.
Table 10. NI 9234 Verification Test Limits for Phase Matching
Generator Frequency (kHz) Phase Matching Channel-to-Channel Limit
1 ±0.085°
10 ±0.49°
Table 11. Function Generator Configuration for CMRR Verification
Signal Type Amplitude (V
pk
) Frequency (kHz)
Sinewave ±0.5 1
F u nction
Gener a tor NI 92 3 4
+
AI
x
HI
LO
–