For an 24-bit ADC operating over a 2.5V range, the accuracy you obtain cannot be better than 2.5/16777216 V or 0.15 uV. However due to noise, this is only achievable through careful wiring. In a typical application, a noise floor of about 18 bits or 9 uV is usually achievable.

The DAQ module used (the EMANT300) has up to 6 differential ADC channels, one 8 bit current DAC channel, 8 digital I/Os and either a 16 bit PWM or a Counter. It is connected to the PC via the USB port of the computer.

The Light Application Adaptor for the EMANT300 has the photodiode BPW34 connected to AIN0 (input analog) of the DAQ module and the resistor connected to AINCOM

LabVIEW is a programming language from National Instruments. It is a graphical language in which the program is drawn rather than written. There is no text-based code like in Basic or C. The program is presented as a diagram with data flow determining the sequence of the program. Scientists and engineers use LabVIEW, as they are already familiar with the schematic way of describing a system function.

In the next few exercises, you will learn how to combine the Data Acquisition Module, Light Application Adaptor and LabVIEW to create a Light Intensity Data Logger.

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