Delta AH500 - Page 65

Chapter 3 Analog Output Module AH04DA/AH08DA
3-7
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
g
inal si
g
nals
Signals after the calibration
Voltage (Y)
10
-10
Digital value (X)