Delta AH500 Manual page 96

AH5 00 Mod ule Manua l
-10 V
Example 2:
The inputs received 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. If the voltage received by the channel is 0 V,
the digital value is 0.0. If the voltage received by the channel is 10.0 V, the digital value is 10.1.
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
4 - 8
10
(X1, Y1) (0 V, -0.05)
-10
Digital value (Y)
(X: Analog signal; Y: Digital value)
10.1
10
(X1, Y1) (0 V, 0)
-10
Digital value (Y)
(X: Analog signal; Y: Digital value)
Signals after the calibration
Original signals
(X2, Y2) (10 V, 9.95)
Voltage (X)
10 V
(X2, Y2) (10 V, 10.1)
Original signals
Signals after the calibration
Voltage (X)
10V