| Products > Test Equipment |
| Not another Multimeter advice thread. |
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| hydrocarbonPrimate:
Hi guys, I currently have a CEM DT-9985 Which has served me well considering how poor the build quality is. It is playing up and and I need something newer that can handle voltage measurement from VFDs and Generators (actually alternators) with noisey outputs. I am sort of between worlds, in that I do a bit with electronics, a lot with automotive and a little with three phase and domestic stuff. I have often looked at buying and LCR meter, for measuring inductors (but I think I read that is more art than science and they are not too accurate?) I use capacitance measurements all the time and need to be able to measure a good range of values. I also need good resolution on Voltage and Resistance because fault finding on automotive stuff, it can be very handy. I also occasionally use the insulation test which is handy, I need a meter that is fairly rugged and has a back light these are very important. I use diode test quite often but never seem to test transistors without them being in a board. The spreadsheet does not seem properly formatted on open office so I'm struggling to read it so was looking for any advice that might be helpful. Many Thanks guys |
| joeqsmith:
I used a CEM for several years for work. The plastic was in very poor shape when I finally retired it. What does "playing up" mean? If you could explain the symptom you are seeing, maybe someone could help you fix yours. |
| hydrocarbonPrimate:
Well it says its IP67 waterproof, but it has no seals on the main selector switch and spilt a very small amount of petrol on it, after that the meter screen would go blank, i took it apart and cleaned up both boards and selector switch contacts and re-assembled, it works now but is very slow transitioning OL to a reading, It's hard to explain, but I no longer trust it. The last capacitor measurements it came up OL when trying to measure a 200uf start cap and the last voltage measurement on 240v the screen went blank after some time. |
| AVGresponding:
Not sure on the best thing to clean petroleum distillate/gasoline contamination. Only thing I'd say is, if you can still smell it, even faintly, it's still contaminated. IP67 relates to water, petrol is much less viscous, and so can creep through small gaps more easily, though the lack of seals on the main switch is puzzling; how did it get the rating? I'd expect water to be easily able to penetrate, given IP67 specifies proof against immersion of 1 metre, and strong water jets from all directions. |
| nightfire:
Disassembly and washing with IPA (iospropylic alcohol) would be my favorite treatment- needs to be continued as often as there is no smell of traces of petrol left. In car petrol some additives and other stuff is present and might also form some kind of oily coat on sensitive electronics, creating some small leakage currents. |
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