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Add external LEDs to a battery tester

Add external LEDs to a battery tester

Add external LEDs to a battery tester

(OP)
I am working on implementing a battery tester to our assembly line that will be checking the internal resistance and OCV of each battery before it is installed in a unit. The tester is set up to give a pass signal if the battery is within specifications and a different fail signal if it is out. So the pass signal is an audible beep and a small green LED that lights up on the face of the tester and the fail signal is a continuous beep and a small red LED that lights up on the face. For clarity the tester that i will be implementing is the Hioki BT3563 https://www.dropbox.com/s/t3bwp3naza9xjh6/mbt3563.... you can see where the IN lights up green when it is in spec. The battery tester will be permanently mounted under the check table within a box and a fixture will hold the leads in place so the battery can easily be checked. So what I would like to know is, would it be possible for me to piggy back off of the internal circuit that holds the LEDs and run two other lights that would be positioned above the table so that the associate would be able to easily tell if the batteries were with in spec or not. The lights would have the same function as the internal LEDs, they would just be within plain view of the associate. I am not to savvy even when it comes to circuits and would basically would like to know if this can be done if I use the same spec LEDs as the ones inside the tester or if I wanted to use a brighter or more than one LED so that it would be more visible. Any suggestions would be much appreciated.

RE: Add external LEDs to a battery tester

That would be a breeze. The BT3563 has three outputs with open collector 35V/50mA specification. So you can connect three LEDs to it. Use any convenient DC supply and a suitable series resistor for each LED. If you use 12V DC, then use 1 kohm series resistors. That works with most LEDs.

From the spec sheet:
Comparator functions
Setting: Upper and lower limit
Output: 3 levels (Hi, In, Lo) or (Pass, Fail), Open-collector(35V, DC50mA max)

Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

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