help sought - fuse for digital multimeter

Sep 09, 2005 31 Replies

Hi, I am an electronics newbie and owing to my own stupidity I need a new fuse for my multimeter.



Maplins say they are waiting for the right fuses to arrive from the Far East.



My question is, do I really need the specific fuse they recommend, or can I use another one instead?



The meter is a UT-70A (digital) by Unitrend.



The manual says get an "identical" fuse, then gives a colon, and specifies 250V and 500mA. It also says phi5X20(mm), which I assume just means 5mm in diameter and 20mm long.



Maplins say the only fuse that will do is the one with their product code N65CA.



I would be grateful if someone could tell me whether another fuse would be OK - i.e. one that I might actually get hold of tomorrow rather than waiting for indefinitely! :)



I only use the meter for hobby electronics, so if the fuse blows at 400mA instead of 500mA, that would be OK with me. But I don't know what other specifications it might be stupid to ignore. Especially given that only a small number of fuses appear to be recommended for use in multimeters.



Many thanks,



Chris


Go to your nearest TV repair shop he'll supply you with one. :-) but make it worthwhile for him, buy half a dozen.

And don't try to measure amps in the mains again ;-)

Not measuring voltages on the amps range again? ;-)

Very easy to find. Buy quickblow rather than surge/delay, unless you find instructions to the contrary.

Bollocks.

Christian.

You need the right rating. I can't think of any reason you need a special "multimeter fuse" (if there is such a thing) unless it is a non standard physical size.

How about:

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Maplins say the only fuse that will do is the one

Could be because they don't list 500mA 20mm glass fuses in their fuses section. So in a sense that may be the only one they do that is suitable.

I would have no worries about substituting the CPC part I linked to above.

This just shows the state of Electronics and the NUMPTIES that are in the business. Not you for blowing the fuse while measuring Amps, but the NUMPTIES in the shop.

I've just noticed my Fluke fuse has blown this morning, can't remember when I last measured mA. It is 5mm. dia. and 20mm. long. My Fluke says

2A. maximum on the Amps input. Just adjust yer fuse to suit the full scale.

Chris.

As I think I mentioned before, a recent visit to a Maplin [1] branch elicited a question from the sprog behind the counter: "what is a grommet for?" when I tried to buy one!

[1] The almost original branch in Westcliff (it moved 100yards down the road to new premises a few years back) where they used to employ well clued up electronics graduates who would think nothing of designing a quick circuit for the people who walked in off the street and said "how can I do something like....?"

Next time ask for a hammerfour.

John Schmitt

Personally, I'm glad that our economy is no longer so crap that decent electronics graduates are working in chain-stores.

Will

Might the following be suitable? Ebay.co.uk item number 7545314889

(no connection with the seller)

Owain

If you need it tomorrow, use a strand of wire. But don't repeat what you did when you blew it!

I know some that work in Boots? Mind degrees are becoming like confetti!

You're surely not implying that our electronics industry is flourishing, and electronics graduates can reasonably expect to get high quality work in their own field, that went out in the '60s +'70s

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for weinstock and closure got me 15,600 hits.

DG

"Chris Nellist" wrote in message news:Xns96CC9B8C71FE1pnellist@195.92.193.157...

May I suggest

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532861 This is a ceramic fuse and so will cope with more nasty faults and protect you better.

"Sparks" wrote in news:43219b36$0$38044$bed64819 @news.gradwell.net:

Us old Plessey AVO8 needlebenders used to ferget to go off the 50 µA range before going back to the real world of HT.

Good cutout, but not *that* good.

mike

Then why not make a resetable electronic fuse? there's ample room in a meter to fit one in circuit.

Plenty of books in the library or online for this sort of stuff.

When I used to repair TV/Videos fuses became an expensive game when it came to locating faults and just when you thought you solved the problem the ruddy fuse would blow.

So i made an electronic fuse to combat this till I knew the fault was solved.

Don't think that was the case then. Maplin was not a chain store then - that shop in Westcliff was the whole empire (we are talking '79/80 ish here - remeber the catlogue with concord on the front?).

There was usually one pre-graduate doing a "year out" type of thing - but the rest were electronics enthusiasts who seemed to like working there.

With regard to positions for electronics grads these days - I would say there are far less than in the early 80s. Software has crept into and replaced many of the traditional electronic engineering places, and analogue or high power RF work is very much reduced.

That's a 25mm (1in) Standard types are 20mm and 1 1/4in.

You seen the prices of genuine Fluke fuses?

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