User manual

ManualsBrandsGW INSTEK ManualsLaboratory & Bench PSUs19" bench PSU (adjustable voltage) 0 - 40 Vdc 0 - 38 A 1 x Ethernet, RS232, RS485, USB remote con

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.

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