National Instruments NI 783xR Benutzerhandbuch

The NI 783xR AI range is fixed at 

±10 V.

The AI signals for the NI 783xR are AI<0..n>+, AI<0..n>–, AIGND, and 
AISENSE. For the NI 7830R, n=4. For the NI 7831R/7833R, n=8. The 
AI<0..n>+ and AI<0..n>– signals are connected to the eight AI channels of 
the NI 783xR. For all input modes, the AI<0..n>+ signals are connected to 
the positive input of the instrumentation amplifier on each channel. The 
signal connected to the negative input of the instrumentation amplifier 
depends on how you configure the input mode of the device.

In differential input mode, signals connected to AI<0..n>– are routed to the 
negative input of the instrumentation amplifier for each channel. In RSE 
input mode, the negative input of the instrumentation amplifier for each 
channel is internally connected to AIGND. In NRSE input mode, the 
AISENSE signal is connected internally to the negative input of the 
instrumentation amplifier for each channel. In DIFF and RSE input modes, 
AISENSE is not used.

Exceeding the differential and common-mode input ranges distorts the input 

signals. Exceeding the maximum input voltage rating can damage the NI 783xR and the 
computer. NI is not liable for any damage resulting from such signal connections. The 
maximum input voltage ratings are listed in Table B-2, 

.

AIGND is a common AI signal that is routed directly to the ground tie point 
on the NI 783xR. You can use this signal for a general analog ground tie 
point to the NI 783xR if necessary.

Connection of AI signals to the NI 783xR depends on the input mode of the 
AI channels you are using and the type of input signal source. With 
different input modes, you can use the instrumentation amplifier in 
different ways. Figure 2-3 shows a diagram of the NI 783xR 
instrumentation amplifier.