DM5210 analog input module 5-3 RTD Embedded Technologies, Inc.
This chapter tells you how to calibrate the A/D converter gain and offset. The offset and full-scale performance
of the module’s A/D converter is factory-calibrated. Any time you suspect inaccurate readings, you can check the
accuracy of your conversions using the procedure below, and make adjusts as necessary. Using the 5210DIAG
diagnostics program is a convenient way to monitor conversions while you calibrate the module.
Calibration is done with the module installed in your system. You can access the trimpots at the edge of the
module. Power up the system and let the board circuitry stabilize for 15 minutes before you start calibrating.
Required Equipment
The following equipment is required for calibration:
• Precision Voltage Source: -10 to +10 volts
• Digital Voltmeter: 5-1/2 digits
• Small Screwdriver (for trimpot adjustment)
While not required, the 5210DIAG diagnostics program (included with example software) is helpful when
performing calibrations. Figure 5-1 shows the module layout with the three trimpots used for calibration (TR1, TR2,
and TR4) located along the top right edge.
Fig. 5-1 — Module Layout
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