AH500 Module Manual
4-12
Example 1:
The outputs sent by a channel are voltages in the range of -10.0 V to +10.0 V. The original
signals are used. The gain is 1, and the offset is 0. The digital value received by the channel is
0, and the voltage measured is -0.05 V. The digital value received by the channel is 10, and the
voltage measured is 9.95 V. Users can calibrate the channel by calibrating the gain and the
offset.
The users can get the gain for the calibration by means of the equations below.
Gain=(Y2-Y1)/(X2-X1)=[9.95-(-0.05)]/(10-0)=1
Gain used for calibration=1/ Gain=1/1=1
The users can get the offset for the calibration by means of the equations below.
Offset=Y1=-0.05
Offset used for calibration=0-Y1=0.05
(X: Digital value; Y: Analog signal)
Example 2:
The outputs sent by a channel are voltages in the range of -10.0 V to +10.0 V. The original
signals are used. The gain is 1, and the offset is 0. The digital value received by the channel is
0, and the voltage measured is 0 V. The digital value received by the channel is 10, and the
voltage measured is 10.1 V. Users can calibrate the channel by calibrating the gain and the
offset.
The users can get the gain for the calibration by means of the equations below.
Gain=(Y2-Y1)/(X2-X1)=[10.1-0]/(10-0)=1.01
Gain used for calibration=1/Gain=1/1.01=0.99
The users can get the offset for the calibration by means of the equations below.
Offset=Y1=0
Offset used for calibration=0-Y1=0
10 V
(X2, Y2) (10, 9.95 V)
(X1, Y1) (0, -0.05 V)
-10 V
Ori
inal si
nals
Signals after the calibration
Voltage (Y)
10
-10
Digital value (X)
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