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5.External Control
Constant voltage (CV) control
You can control the voltage in CV mode, CC+CV mode, or CR+CV mode using external volt-
age. When you apply an external voltage of 0 V to 10 V to the EXT CONT connector, the volt-
age varies proportionally to that external voltage.
An external voltage of 0 V results in voltage of 0 V. An external voltage of 10 V results in volt-
age of 100% of the specified range. The accuracy cannot be guaranteed when the external
voltage is less than 0 V or more than 10 V.
Vo
To avoid damaging the product, observe the following precautions.
CAUTION
• The maximum voltage that can be applied across pins 22 and 23 of the EXT CONT con-
nector is ±11 V. Do not apply a voltage that exceeds this.
• Pin 23 of the EXT CONT connector is connected to the negative (−) load input terminal.
Make sure that the wire of pin 23 does not touch any of the other pins.
1
2
3
4
5
6
7
PLZ-5W
Vm
0 V
0 V
10 V
Ein
Turn the POWER switch off.
Connect an external voltage across pins 22 and 23 of the EXT CONT
connector.
To prevent noise interference, use twisted wires for the signal cables. Use a highly sta-
ble external voltage that has low noise.
PLZ-5W
EXT CONT CV
1 M
A COM
Turn the POWER switch on and check that the load is off.
Set the operation mode and the current range.
If you also want to control the current range externally, be sure to set the range to H.
Press SOURCE and then More.
Use the rotary knob to select CV under External Control, and then press
Edit.
Use the rotary knob to select Enable, and then press ENTER.
You can now externally control the voltage in CV mode, CC+CV mode, or CR+CV
mode.
Vo : Input voltage
Vm : Rated voltage
Ein : External voltage
Twist
EXT CONT
22
23
Load Setting Control
Vm×Ein
Vo
10
External voltage
+
–
73
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