GW Instek PSU-Series User Manual - Manual (Page 151)

ANALOG CONTROL
151
Isolated External Current Control of Current Output
Background Current control of the current output uses the
isolated current option (PSU-ISO-I). A current
of 4~20mA is used to control the full scale
current of the instrument, where:
Output current = full scale current × ((external
current - 4mA)/16mA)
Connection When connecting the external current source to
the isolated current option, use shielded or
twisted paired wiring.
PSU EXT-I
Isolated
Current
Option 4
3
Output
Terminal
2 core shielded
wire or twisted
pair
1or8
 Pin4(GND_ISO) → EXT-I (-)
 Pin3(+IPROG_ISO) → EXT-I (+)
 Pin 1 or 8 (Shield) → Wire shield