Source: http://www.mobilestudioproject.com/analog-calibration
Timestamp: 2019-04-26 10:16:02+00:00

Document:
The IOBoard you will be using may require calibration. Your instructor will tell you if this is needed. Calibrating the IOBoard requires close attention to detail but it is not hard to do. The only instrument you’ll need is a digital multimeter.
Figure 1 below is the arrangement of the connections on the IOBoard. Calibration requires measuring and adjusting voltages at some of the terminals and then using these output ports to automatically calibrate the input ports.
1. Close any instruments that are on your screen.
3. Connect your digital multimeter to the AWG1 terminal and its ground. See Fig. 1.
4. Set Analog I/O’s Analog Out Ch1 to 3.000 V.
5. Select Device –> Analog Calibration.
7. On the “AWG output” line, adjust “Gain” to get the dmm to read 3.000.
8. Change Analog Out Ch1 to –3.000 V.
9. Note the dmm’s reading. Calculate the mean value between this number and –3.000. For example, if the reading is –3.227, the mean value is –3.114 V.
10. On the “AWG Output” line, adjust “Offset (SE)” to get the dmm to read the value just calculated.
11. On the “AWG output” line, adjust “Gain” to get the dmm to read –3.000 V.
12. Change Analog Out Ch1 to +3.000 V.
13. Check the dmm, which should read 3.000 V. If it doesn’t, split the difference and return to Step 7.
a. Connect the dmm to AWG2 and its ground.
b. Set Analog I/O’s Analog Out Ch2 as directed.
This completes the manual calibration of the outputs.
Now we’ll have Mobile Studio automatically calibrate the inputs A1+/– and A2 +/–.
3. Connect AWG2 to A2+ and AWG2’s ground to A2–.
4. Near the bottom of the Analog Calibration screen,click the “auto-calibrate A1” button. Calibration could take as long as a minute.
5. Similarly, click the “auto-calibrate A2” button.
That does it! All of the instruments are calibrated.
Text and image courtesy of Dr. William J. Eccles, Rose-Hulman Institute of Technology.

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