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This chapter tells you how to calibrate the A/D converter gain and offset and the D/A converter X2 multiplier
(ADA1200 only). All A/D and D/A ranges are factory-calibrated before shipping. Any time you suspecr inaccurare
readings, you can check ttre accuracy of your conversions using the procedure below, and make adjustments as
necessary. Using the 1200DIAG diagnostics program is a convenient way to monitor conversions while you
calibrate the board.
Calibration is done with the board installed in your system. You can access the trimpots at the edge of the
board. 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 o +10 volts
. Digital Voltmeter: 5-112 digis
. Small Screwdriver (for trimpot adjustment)
While not required, ttre I200DIAG diagnostics progam (included with example software) is helpful when
performing calibrations. Figure 5-1 shows the board layout with the trimpots located along ttre top edge of the board
(TR2 and TR3 at left, TR7 in middle, and TRl, TR4, and TR6 at right).
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Fig. 5-1 - Board Layout
5-3
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