PSU Series User Manual 
130 
4.  Press the Output key. The 
current can now be 
controlled with the 
External resistance. 
Ensure the resistor(s) and cables used exceed the 
isolation voltage of the power supply. For example: 
insulation tubes with a withstand voltage higher than 
the power supply can be used.  
When choosing an external resistor ensure the resistor 
can withstand a high degree of heat. 
CV and CC Slew Rate Priority are disabled for V-I mode 
(F-03) when using external resistance control. See the 
normal function settings on page 101. 
External Control of Output 
 
The output can be turned on or off externally using 
a switch. The analog control connector can be set 
to turn the output on from a high or low signal.  
The voltage across pins 19 and 20 are internally 
pulled up to +5V ±5% @ 500uA with 10kΩ pull-up 
resistor. A short (closed switch) produces a low 
signal. 
When set to High = On, the output is turned on 
when the pins 19-20 are open.  
When Low = On, the output is turned on when 
pins 19-20 are shorted.