Products > Test Equipment
How do I switch to Constant Current instead of Constant Voltage on RD6018?
sofakng:
I'm trying to test an LED with a max current of 100 mA.
The RD6018 shows [CV] at the bottom of the screen so I'm assuming it's in Constant Voltage mode so how do I switch to Constant Current?
I've already destroyed one LED because of my misunderstanding of the bench power supply. I had V-SET to 5.00v and I-SET to 0.9A (and no OCP). I'm confused though because I have current set to 0.9A but I'm guessing that only works in Constant Current mode?
Fungus:
I doubt it has constant current mode.
For an LED you can set the voltage much too high then use the current limiter. Set it to 100mA.
wasedadoc:
0.9A is 900mA. That is 9 times the 100mA max of the LED.
Martin72:
Hi,
A supply is in it´s constant current mode when you have reached the pre-adjusted current.
Until this it´s in constant voltage mode.
For your LED you should set the current to 100mA before.
BTW, what LED is it?
sofakng:
Ahhhh... thanks. I'm an idiot. 0.9A is 900mA as mentioned by wasedadoc.
The LEDs are the SFH 4547.
What is the expected behavior of the following settings?
V-SET: 5.0v
I-SET: 0.1A (100mA)
The LED has a forward voltage of 1.5V so would the PSU reduce the voltage from 5.0V to 1.5V and go into Constant Current mode to limit the current to 100 mA?
Also -- When I measure the LED with my multimeter (Fluke 87V) using the diode mode, it shows 1.1V. The specifications show 1.5V so I was expecting to see that?
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