Measurement slightly incorrect with raw data measurements

Hello everyone,
I am reading raw data continuously at a sample rate of 10 kHz at 16 analog channels between 0Volt and 5Volt. The voltage is supplied by the 5 Volt output of the DAQ device. Because I am reading raw data, I have to calculate the real value in Volts. When I do this I only get to 4,9 Volt. Is this normal when running in raw data mode, because the scaling cannot be changed? Could anyone please help me with this problem?
Thanks in advance,
Souza
By the way, I am using the following hard- and software:
NI6220(PCI M-series)
Visual Studio 2003 C#

Souza,
I am curious as to what formula you are using to scale your raw values into voltages. One thing to keep in mind is that your M-Series device is software calibrated. Therefore using a formula such as (AI Range/2^ADC resolution)*raw value read may not give a correct result, as there is some additonal scaling that needs to be done by software. However, you should be able to query the driver to determine what scaling coefficients to use by calling DAQmxGetAIDevScalingCoeff on your task. From the DAQmx C reference help:
Analog Input >> General Properties >> Advanced >> Device Scaling Coefficients >> Device Scaling Coefficients
Data Type:
float64*
Description:
Indicates the coefficients of a polynomial equation that NI-DAQmx uses to scale values from the native format of the device to volts. Each element of the array corresponds to a term of the equation. For example, if index two of the array is 4, the third term of the equation is 4x^2. Scaling coefficients do not account for any custom scales or sensors contained by the channel.
Restrictions:
Not Settable
You can get this property using:
DAQmxGetAIDevScalingCoeff
Hope this helps,
Dan

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