PC-6023 MAX INPUT VOLTAGE

IN THE NAME OF GOD
I have a pci-6023E card and potentiometer . The ouput of the pot. is differential .
The (-)end is always 13.5 Volt and the (+) end is between 5to22 Volt. I connected the output of the pot. to the input of the card in dif mode and i could measure the output of pot( ie 13.5-(5to22) ) successfully.Is this a correct connection to the card?
The maximum working voltage of each input of the card , according to manual, is 11 volt, but my sensor (i.e pot.) outputs are 13.5 and (5-22) !!
I used BNC-2110 terminal in dif. mode for this exprement.
Please explain me that how the card can successfully measured this input?
Can this demage the card at ling time or not?
thanks
Edward. Hb.

Thanks Mr. Alan A
I am "434343" memeber.
I recive your response to my question about "Max input voltage of PCI-6023E" .But I have some questions.
According to the "Data Acquistion Specification- a Glossary by Richard House" ( Application Note 092):
"Maximum Working Voltage (signal+common mode)= the highest voltage level that can be input to board without saturating the input."
And according to your response:
"measuring a signal with higher common mode voltage than that(11V) might not accurate"
But in may experiment with a potentiometer (floating differntial source with (-)13.5V and (+) 5to22V),I could successfully measure the signal without saturating and without error (Max error is about +/- 0.02 volt)!!
I think that the maximum working voltage of PCI-6023E is greater then 11 volt??!!
or my measurement has a little error.
I think that I don't need to use a signal conditioning circuit.
Please Help me.
Thans again.
Edward Hb.

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PC-6023 MAX INPUT VOLTAGE

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