Using The 4 To 20 Ma Current Loop Output - Keithley DAC-02 User Manual

Low-level ground connections can be made to any of pins 2 to 12.
Data coding for unipolar outputs 0 to 5 V, 0 to 10 V, and 4 to 20 mA is true
binary. Because of the analog inversion in bipolar outputs ±5 V and
±10 V, data coding is complementary offset binary (that is, zero
corresponds to +full-scale analog, and 4095 corresponds to -full-scale
analog).

Using the 4 to 20 mA Current Loop Output

The 4 to 20 mA current loop output consists of a precision current sink,
formed by a VMOS power FET, and a reverse-protection diode, as shown
in Figure 4-3.
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Table 4-1. Pin Wiring for Output Ranges (cont.)
Range DAC #
±10 V 0
1
4 to 20 mA 0
1
AC Reference 0
1
Jumper Pins Output
20 to 22 Pin 23
14 to 16 Pin 17
21 to 22 Pin 25
15 to 16 Pin 19
In on pin 22 Pin 24 (2-quadrant)
In on pin 22 Pin 23 (4-quadrant)
In on pin 16 Pin 18 (2-quadrant)
In on pin 16 Pin 17 (4-quadrant)
4-3