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Chapter 3

Hardware Overview

 National Instruments Corporation

3-3

configuration, refer to the 

 section in 

 which contains diagrams showing the 

signal paths for DIFF input.

The 611X E board has bipolar inputs only. Bipolar input means that the 
input voltage range is between –V

ref

 

/2

 

and + V

ref

/2. These boards have 

a bipolar input range of 20 V (±10 V).

You can program range settings on a per channel basis so that you can 
configure each input channel uniquely.

The software-programmable gain on these boards increases their 
overall flexibility by matching the input signal ranges to those that the 
ADC can accommodate. They have gains of 0.2, 0.5, 1, 2, 5, 10, 20, and 
50, and are suited for a wide variety of signal levels. With the proper 
gain setting, you can use the full resolution of the ADC to measure the 
input signal. Table 3-1 shows the overall input range and precision 
according to the gain used.

Table 3-1.  Actual Range and Measurement Precision

–10 to +10 V

0.2
0.5
1.0
2.0
5.0

10.0
20.0
50.0

–50 to +50 V
–20 to +20 V
–10 to +10 V

–5 to +5 V
–2 to +2 V

–1 to +1V

–500 to +500 mV
–200 to +200 mV

24.41 mV

9.77 mV
4.88 mV
2.44 mV

976.56 µV
488.28 µV
244.14 µV

97.66 µV

1 

Warning: The 611X E is not designed for input voltages greater than 42 V, even if a 

user-installed voltage divider reduces the voltage to within the input range of the DAQ 
device. Input voltages greater than 42 V can damage the 611X E, any device connected to 
it, and the host computer. Overvoltage can also cause an electric shock hazard for the 
operator. National Instruments is NOT liable for damage or injury resulting from such 
misuse.

2 

The value of 1 LSB of the 12-bit ADC; that is, the voltage increment corresponding to a 

change of one count in the ADC 12-bit count.

Note: See Appendix A, Specifications, for absolute maximum ratings.

PCI_E.book  Page 3  Thursday, June 25, 1998  12:55 PM