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Input impedence/common mode voltage of 6110/6115

We have a number of 6110 and 6115 boards that have been damaged.  To provide input protection I need to know the input impedence both input + to input -, and both inputs to analog common.  What is the impedence from one channels input common to another one?  What is the maximum common mode voltage on a given channel?  What is the maximum voltage between input commons?
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Hello. 
 
Thank you for posting to the NI Discussion Forums. 
 
The information that you are requesting can be found in the user's manuals for the devices that you specify.  Please refer to the following links for information on what the resistance and voltage specifications are for the 6110 and the 6115. 
 
6110 specifications
 
6115 user's manual
 
For the 6115, please navigate to Appendix A for detailed specifications for the device. 
 
Let us know if you find everything that you are looking for!
 
Brian F
Applications Engineer
National Instruments
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