Delta DVP04AD-SL - Adjust A;D Conversion Curve

- 5 -
 Adjust A/D Conversion Curve
Users can adjust the conversion curves according to the actual needs by changing the
Offset value (CR#28 ~ CR#31) and Gain value (CR#34 ~ CR#37).
Gain: The corresponding voltage/current input value when the digital output value =
16,000.
Offset: The corresponding voltage/current input value when the digital output value = 0.
 Equation for voltage input Mode0: 0.3125mV = 20V/64,000 = 10V/32,000

OffsetGainOffset
V
VX
Y 








 32000
10
16000
)(
)(
Y=Digital output, X=Voltage input
 Equation for voltage input Mode4 / Mode5 / Mode6: 0.15625mV = 10V/64,000 =
5V/32,000

OffsetGainOffset
V
VX
Y 








 32000
5
16000
)(
)(
Y=Digital output, X=Voltage input
 Equation for current input Mode1 / Mode2: 0.625μA = 40mA/64,000 = 20mA/32,000
 OffsetGainOffset
mA
mAX
Y 








 32000
20
16000
)(
)(
Y=Digital output, X=Current input
 Equation for current input Mode3: 0.5μA = 16mA/32,000
Adopt the Equation of current input Mode3, substitute Gain for 19200 (12mA) and
Offset for 6400 (4mA)
 640019200640032000
20
16000 









)(
)(
mA
mAX
Y
Y=Digital output, X=Current input
 Mode 0:  Mode 1:
Voltage input
+32000
+16000
-16000
10V
-32000
-10V
5V
0
Gain
Offset
Digital
output
+32384
-32384
Current input
+32000
+16000
-16000
20mA
-32000
-20mA
10mA
0
Gain
Offset
Digital
output
+32384
-32384
Mode 0 of CR#2 ~ CR#5 -10V ~ +10V，Gain = 5V (16,000)，Offset = 0V (0)
Mode 1 of CR#2 ~ CR#5 20mA ~ +20mA，Gain = 10mA (16,000)，Offset = 0V (0)
Range of digital conversion -32,000 ~ +32,000
Max./Min. range of digital
conversion
-32,384 ~ +32,384