DM5210 analog input module 5-5 RTD Embedded Technologies, Inc.
Data Values for Calibrating Unipolar Range (0 to +10 volts)
Offset (TR4)
Input Voltage = +1.22070 mV
Converter Gain (TR1)
Input Voltage = +9.99634 V
A/D Converted Data
0000 0000 0000
0000 0000 0001
1111 1111 1110
1111 1111 1111
Bipolar Calibration
Two adjustments are made to calibrate the A/D converter for the bipolar ranges of ±5 and ±10 volts. One is the
offset adjustment, and the other is the full scale, or gain, adjustment. Trimpot TR2 is used to make the offset adjust-
ment, and trimpot TR1 is used for gain adjustment. These adjustments are made with the module set for a range of -5
to +5 volts. Before making these adjustments, make sure that the jumpers on P5 and P6 are set for this range.
Use analog input channel 1 (gain = 1) while calibrating the module. Connect your precision voltage source to
channel 1. Set the voltage source to -4.99878 volts, start a conversion, and read the resulting data. Adjust trimpot
TR2 until it flickers between the values listed in the table below. Next, set the voltage to +4.99634 volts, and repeat
the procedure, this time adjusting TR1 until the data flickers between the values in the table.
Data Values for Calibrating Bipolar Ranges (Using -5 to +5 volts)
Offset (TR2)
Input Voltage = -4.99878V
Converter Gain (TR1)
Input Voltage = +4.99634V
A/D Converted Data
0000 0000 0000
0000 0000 0001
1111 1111 1110
1111 1111 1111
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