National Instruments 6008 用户手册

The differential input mode can measure 

±20 V signals in the ±20 V range. 

However, the maximum voltage on any one pin is 

±10 V with respect to 

GND. For example, if AI 1 is 

+10 V and AI 5 is –10 V, then the 

measurement returned from the device is 

+20 V.

Figure 8.  Example of a Differential 20 V Measurement

Connecting a signal greater than 

±10 V on either pin results in a clipped 

output.

Figure 9.  Exceeding 

±

10 V on AI Returns Clipped Output

–5

–10

–15

–20

20

15

10

5

0

Amplitude (V)

AI 1

AI 5

Result

–5

–10

–15

–20

20

15

10

5

0

Amplitude (V)

AI 1

AI 5

Result