National Instruments NI 9215 Figure 9. Input Circuitry for One Channel on the NI 9215 with BNC

© National Instruments Corp. 17 NI 9215 Operating Instructions and Specifications
The NI 9215 with BNC has a resistor that ensures the input voltage
does not drift outside of the common-mode range.
Figure 9. Input Circuitry for One Channel on the NI 9215 with BNC
AI +
AI –
Isolated
ADC
NI 9215 with BNC
+
–
Instrumentation
Amplifier
100 kΩ
Overvoltage
Protection
Overvoltage
Protection