07-23-2007 05:28 AM
07-23-2007 06:38 AM
07-23-2007 07:18 AM
07-23-2007 08:51 AM
The number of digits in the file or even the numbre of digits on a front panel display have nothing to do with the range. The DAQ driver returns results as DBL at all times. The numeric representation does not change with the range. It is not like a DMM where you have 2 1/2, 3 1/2, number of digits. The Write Measurement File takes that double and then converts it to a string with x number of digits and writes that to a file.
You have to understand how ranges work and what happens when you specify a range. A DAQ board will have one or more physical range settings. They might be +/- .1, +/- 1, +/- 10, etc. There is a fixed number of ranges and they are set in hardware. I have not looked up the exact physical ranges that are supported by your board. That information will be in your manual. When you provide a range to the DAQ driver, the driver software determines the best physical range of the board that will accomodate your signal. So, when you specify +/- 5, my guess is that your board does not have that as a supported range and is using the next highest (i.e. +/- 10).
07-24-2007 02:28 AM