GW Instek PSU 12.5-120 - Isolated External Current Control of Current Output

PSU Series User Manual
152
Note
Use a stable current supply for the external current
control.
Note
CV and CC Slew Rate Priority are disabled for V-I mode
(F-03) when using external current control. See the
normal function settings on page 101.
CAUTION
Ensure the polarity is correct when connecting the
external current.
Ensure no more than 21mA are input into the external
isolated current input.
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.
PSUEXT-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