Cal Constant 1 on an SXCI-1102. How many bits?

[Don@Lear]

National Instruments documentation says "Cal Constant Out 1 (stored in the EEPROM of an SCXI-1102) is the binary zero offset". Therefore, I understand that it is a BINARY value. But, how many bits is that binary value. It could not possibly be the number of bits of my data acquisition card, because the constants in the Factory EEPROM Area are valid whether I use a 12-bit or a 16-bit DAQ Card. I will very much appreciate an answer.

[JoshuaP]

Hey Don,

The size of the EEPROM area is 64-bits for each Cal Constant. This allows for double precision floating point number to be used, which is much higher than the resolution on 12 or 16-bit DAQ devices. The device subtracts the offset from the actual voltage, not the 12 or 16-bit binary number returned from the ADC.

I hope this helps out.

Joshua P.
Application Engineering
National Instruments