omelette
Junior Member level 1
I've just fried my Extech EX730 clamp meter while developing something that used a 230V-12V transformer in reverse, and 18V on its secondary. Given that the meter is rated to 600V, I figured there would be no problem! Now I have a meter on which only the temperature and frequency functions work - everything to do with voltage is gone, INCLUDING the clamp-current options!!! Given that some functions still work, it would appear (to me) that Extech are using no buffering of any sort between the input and logic, just a direct connection. Does anyone know anything about these meters???
PS. This is my second Extech clamp meter. The first EX730's temperature function failed after just a year and was replaced under the 3-year warranty. The main reason I opted for Extech was because I then reasoned that they were of at least of intermediate quality - no Fluke, but much better than cheap Chinese meters. Sadly my experience has shown this to be definitely not the case. The reason I got the EX730 was to measure DC current. Although this has a supposed resolution of 0.01A, the practice you cannot measure anything withing a couple of hundred milliamps. And both meters were identical, so it's not a case of having got a dud! Compare that to the Uni-T UT210E I got recently. It's an order of magnitude better than the Extech when it comes to measuring current, while costing about a third the price. I also got an Extech 42530 IR meter at the same time. This piece of crap's reading wanders all over the place,right down to -50C at times - just another piece of Extech junk in my experience.
Excuse me letting off a little steam, but that meter is just a stone-throw away from being introduced to a lump-hammer... :-D
PS. This is my second Extech clamp meter. The first EX730's temperature function failed after just a year and was replaced under the 3-year warranty. The main reason I opted for Extech was because I then reasoned that they were of at least of intermediate quality - no Fluke, but much better than cheap Chinese meters. Sadly my experience has shown this to be definitely not the case. The reason I got the EX730 was to measure DC current. Although this has a supposed resolution of 0.01A, the practice you cannot measure anything withing a couple of hundred milliamps. And both meters were identical, so it's not a case of having got a dud! Compare that to the Uni-T UT210E I got recently. It's an order of magnitude better than the Extech when it comes to measuring current, while costing about a third the price. I also got an Extech 42530 IR meter at the same time. This piece of crap's reading wanders all over the place,right down to -50C at times - just another piece of Extech junk in my experience.
Excuse me letting off a little steam, but that meter is just a stone-throw away from being introduced to a lump-hammer... :-D