PA.2. Sending and Receiving Voltages from the Front Panel
In the Front Panel of Measure.vi (version 2), run the VI (Ctrl/R) with a variety of voltages sent out and verify that the send (output) and read (input) agree. From the Diagram of Measure.vi, Double Click on Mean.vi to open the Front Panel of this VI. Note the X Array Digital Control and the mean Digital Indicator. Now run Measure.vi with Send Volts = 0.1 V. Note that the measurement data appear in the Array Digital Control. These are the data points that are averaged.
Now go to Mean.vi, Right Click on the indicators, select Format and Precision, and type 4 for Digits of Precision. Then scroll through the array data (by clicking on the up and down arrows of the Array Digital Control as shown in the sample) and compare the numbers with the mean. There will probably be some scatter in the least significant digit, due to noise. Note that the number received and averaged is not exactly the same as that requested to be sent out. This is due to the discrete nature of ADC (analog-to-digital conversion) and DAC (digital-to-analog conversion) as discussed and demonstrated in a following section.
