Author Topic: World's cheapest multimeter teardown  (Read 11321 times)

0 Members and 1 Guest are viewing this topic.

Offline rolycat

  • Super Contributor
  • ***
  • Posts: 1090
  • Country: gb
Re: World's cheapest multimeter teardown
« Reply #25 on: March 26, 2015, 11:28:35 am »
A car battery?? Shorted?? They can push >60A! That'll fry anything including your best Fluke, never mind some $3 dollar Chinameter.
A shorted car battery can deliver over a thousand amps. Many car batteries have a cold cranking amps (CCA) rating of five hundred or more, and will exceed this by a factor of two or three in a dead short.
 

Offline McBryce

  • Super Contributor
  • ***
  • Posts: 1429
  • Country: de
Re: World's cheapest multimeter teardown
« Reply #26 on: March 26, 2015, 11:32:46 am »
Yes, I know. The 60A was more in reference to the highest (non-clamp) Ampmeter I've ever come across, not what the battery can actually achieve.

McBryce.
 

Offline meeder

  • Regular Contributor
  • *
  • Posts: 219
  • Country: nl
Re: World's cheapest multimeter teardown
« Reply #27 on: March 26, 2015, 11:37:16 am »
Several of the customers and friends I gave meters to ignored my warning and decided to measure amperage of their car battery by putting probes across or the like with expected result. In all cases it was the wires that went first. IMO those runs are more than adequate for 10a.

A car battery?? Shorted?? They can push >60A! That'll fry anything including your best Fluke, never mind some $3 dollar Chinameter.

McBryce.

Years ago I measured the current draw on the battery in my 1991 Mk2 Golf diesel. First you have the +/- 10 seconds of glowing which draws around 50A and during starting the current draw peaked at over 400A.
 

Offline paulie

  • Frequent Contributor
  • **
  • Banned!
  • Posts: 849
  • Country: us
Re: World's cheapest multimeter teardown
« Reply #28 on: March 26, 2015, 11:38:05 am »
As far as these or any meters are concerned the difference between 60a and 1000a is moot. It occurs to me the absence of a glass fuse may not be a problem at all. There is obviously a trace somewhere across those big pads and assuming it's thin enough should serve the purpose fine.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf