Connection- alt. 
shielding 
If the wire shield needs to be grounded at the 
voltage source (EXT-V), then the shield cannot 
also be grounded at the negative (-) terminal 
output of the PSW power supply. This would 
short the output. 
PSWEXT-V
Analog 
connector
+
-
16
5
Output 
Terminal
2 core shielded 
wire or twisted 
pair
 
  Pin16 → EXT-V (-) 
  Pin5 → EXT-V (+) 
  Wire shield → EXT-V ground (GND) 
1.  Connect the external voltage according to the 
connection diagrams above. 
2.  Set the F-91 power on 
configuration setting to 1 (CC 
control – Ext voltage). 
  Be sure to cycle the power after the power 
on configuration has been set.  
3.  Press the Function key and confirm 
the new configuration settings (F-
91=1). 
4.  Press the Output key. The current 
can now be controlled with the 
External voltage.