SailNet Community - View Single Post - Fluke 87
Thread: Fluke 87
View Single Post
  #14  
Old 03-20-2013
asdf38's Avatar
asdf38 asdf38 is offline
Senior Member
 
Join Date: Jul 2010
Posts: 724
Thanks: 1
Thanked 8 Times in 8 Posts
Rep Power: 5
asdf38 is on a distinguished road
Re: Fluke 87

Quote:
Originally Posted by SchockT View Post
A short isn't a subjective thing when you are trying to troubleshoot a line voltage control circuit that is blowing control fuses, and the cheap meter says that a portion of the circuit is O/L, and the good meter says it is shorted to ground. In that case having a crappy meter means spending a lot more time searching for a problem that it can't see.
In that case, a short (in the blow something up sense) is anything greater than the fuse. Which in the case of a 120V system and a 1A control fuse might be 120 ohms or more. However compare that to boat circuit where a 120 ohm load is only 0.1A. That's not a short by anyone's definition in almost any circumstance.

However, in this respect, measuring low resistance, the better meter is going to help you. For example a 12A load in a 12V boat circuit would be just 1 ohm and plenty of boats have plenty of loads that strong. That means that even 1 ohm on a boat can easily be a normal load and not a fuse blowing "short". Distinguishing between low ohm loads is probably more important on a boat, with its 12V high current circuits than 120V systems with comparatively low current high resistance loads. And the fluke meter is going to help you do that.

Although even the fluke will struggle below 1 ohm because test leads, and the resistance of a touch connection between them and another metal surface add on the order of 0.1 to a few ohms. And all that said, loads don't usually present themselves as just a simple resistance.

But anyways, still saying the fluke is great.
Reply With Quote Share with Facebook