EEVblog® Electronics Community Forum
Products => Test Equipment => Topic started by: Seekonk on December 22, 2015, 10:09:27 pm
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I had to replace a pipe and snake a drain behind my furnace the other day. I found my EXTCH 380222 meter that was lost probably in 1999 when I replaced the furnace. From date code this was probably purchased in 1995. This was one of the first meters with a supercap, Philips 1F 5.5V, instead of a battery. I got tired of getting on site and having a dead battery. A couple of minutes of charge and it was good for 20 minutes. It will charge from up to 230VAC or 9-20V AC or DC. Inside there is a 230/9V blue transformer. Main chip is a Maxim MAX138CPL with HEF4070 and TLC27L2CP. It still has the display protective plastic. It took a while for the 1F capacitor to reform after all that time but it seems to work fine now. I always wondered what happened to it.
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Still, now, bet you are glad it had a super-cap and not alkaline batteries in it!
If it had had alkalines and they had leaked it would be an ugly ugly mess in there.