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3.4.1 Analog Current Measurements
The A/D converter inputs can also be used with 4–20 mA current sources by measuring the
resulting analog voltage drop across a 100 ? 1% precision resistor. These 100 ? 1% preci-
sion resistors are included on the A/D Converter Card for analog input channels AIN0–
AIN3, and each of these channels may be configured individually using the jumpers on
header JP1 as shown in Figure 23.
SEQ
0 W
RESISTORS
INSTALLED
R50
R49
R47
R44
?
?
?
?
ANALOG INPUT
CHANNEL
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
JP1
R36
R37
R38
R39
R40
R41
R42
R43
R44
R47
R49
R50
R36
R51
GND
AIN7
AIN6
AIN5
AIN4
AIN3
AIN2
AIN1
AIN0
Figure 23. Locations of Resistors for 4–20 mA Mode
CAUTION: The input impedance is low for the 4–20 mA current mode. Be careful
not to exceed 2.5 V across the input when using the 4–20 mA current mode to keep
the power dissipation by the 100 ? precision resistors below their maximum rating.
For volume orders of A/D Converter Cards configured as 4–20 mA analog inputs, 0 ?
surface-mounted resistors can be installed at the factory instead of the jumpers on header
JP1, and AIN4–AIN7 can also be configured for use as 4–20 mA analog inputs. Contact your
Rabbit Semiconductor Sales representative or your authorized distributor for more informa-
tion on these options and the minimum order quantity.
The single-ended scale of 0–2.56 V with a gain of 8 is used to get an A/D current conver-
sion of 12.5 μA/tick.
58
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