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Author Topic: Using a multimeter  (Read 1547 times)

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Marks DTM Calib

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Re: Using a multimeter
« Reply #30 on: 14 September 2009, 13:43:22 »

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So what do we think Gents, 5k?, if its 240v driven sound a bit on the high side to me, works out about 50mA, Not enough to to switch a water solenoid me thinks.

Probably is actually.....

Remember that F=BIL (as a absic formula, not a direct formula for a solenoid though)

Where I is the current
B is magnetic field strength
L is the length of the wire.

And hence a low current through a long wire would as per a solenoid can give a high force

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Nickbat

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Re: Using a multimeter
« Reply #31 on: 14 September 2009, 13:45:09 »

OK, so I isolated the machine and went to inspect the front control panel. I found that the panel was only held on to the springloaded arms by one of the existing (pathetic) screws. Despite my long magnet and trawling under the cabinets, I couldn't find the other three, so I dug out some screws to make a temporary repair.

When I took the front panel off, the first thing I noticed was that door closed microswitch was not in its rightful place, so maybe that was causing a problem (or maybe it fell off when I dismantled it). I must admit that I did get some intermittent filling of the machine last night, so maybe that switch was working its way off then. Anyhow, just need to get it all back together/. Probably still won't work, but SWMBO is after a new kitchen in the New Year and told me that if the dishwasher is fubared, we'll I'll  just have to wash up by hand until then. So, this is serious, folks!!  ;) ;D ;D
« Last Edit: 14 September 2009, 13:46:16 by Nickbat »
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Kevin Wood

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Re: Using a multimeter
« Reply #32 on: 14 September 2009, 13:49:18 »

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Probably still won't work, but SWMBO is after a new kitchen in the New Year and told me that if the dishwasher is fubared, we'll I'll  just have to wash up by hand until then. So, this is serious, folks!!  ;) ;D ;D

Whereas if the kitchen is full of perfectly working appliances she won't need a new one. :y

Should have seen the look on mrs. KW's face when I fitted a new thermostat to the oven, thus torpedoing her main argument for wanting a new kitchen (and conservatory into which to extend it).  ;D

Kevin
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Nickbat

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Re: Using a multimeter
« Reply #33 on: 14 September 2009, 13:50:24 »

Incidentally, I am really embarrassed about not being able to use a multimeter. :-[ I'm fine with AC/DC voltage, but resistance, continuity etc. are a mystery. Why didn't they teach me in school? Or was I away that day?   ;D

Anyhow, I did find a really useful PPT presentation on multimeters at:

http://www.wolfmedicalrehab.com/How%20to%20use%20a%20Digital%20Multimeter.ppt

..and the one shown is near-enough exactly the same as mine, so I'll store the file for future reference.  :y 
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Kevin Wood

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Re: Using a multimeter
« Reply #34 on: 14 September 2009, 14:01:18 »

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Incidentally, I am really embarrassed about not being able to use a multimeter. :-[ I'm fine with AC/DC voltage, but resistance, continuity etc. are a mystery. Why didn't they teach me in school? Or was I away that day?   ;D
 

If it was anything like my school they assumed a generic science teacher would be more than adequate to teach electronics (to A level :o). I was on the course first year they did it and ended up doing more teaching than the teacher, much to his disgust.

Picked the wrong person to teach electronics, I guess. He was frantically reading up the night before the lesson whereas I had already passed the radio amateur exam and was busy building radios and 8 bit micros after school by then. :-[

Kevin
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Marks DTM Calib

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Re: Using a multimeter
« Reply #35 on: 14 September 2009, 15:37:33 »

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Quote
Probably still won't work, but SWMBO is after a new kitchen in the New Year and told me that if the dishwasher is fubared, we'll I'll  just have to wash up by hand until then. So, this is serious, folks!!  ;) ;D ;D

Whereas if the kitchen is full of perfectly working appliances she won't need a new one. :y

Should have seen the look on mrs. KW's face when I fitted a new thermostat to the oven, thus torpedoing her main argument for wanting a new kitchen (and conservatory into which to extend it).  ;D

Kevin

Wont be a conservatory.....and will need planning and regs  :y
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Nickbat

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Re: Using a multimeter
« Reply #36 on: 14 September 2009, 16:08:30 »

Well, mainly good news. The dishwasher now works again! :y

The only downside is that the On/Off push button which has always been a bit temperamental now needs to be held in with a lolly stick. Mind you it is a very good lolly stick and really blends in with the kitchen.  ;) :D ;D
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Kevin Wood

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Re: Using a multimeter
« Reply #37 on: 14 September 2009, 16:35:14 »

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Wont be a conservatory.....and will need planning and regs  :y

That was going to be my next line of defence!  ;D

Kevin
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Marks DTM Calib

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Re: Using a multimeter
« Reply #38 on: 14 September 2009, 18:02:47 »

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Quote
Wont be a conservatory.....and will need planning and regs  :y

That was going to be my next line of defence!  ;D

Kevin

Well thats a pretty fool proof one.....as you wont be allowed to site a kitchen in a temporary structure (conservatories are classifed as little more than sheds and hence how you get away with putting up such a god awfully insulated thing).
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Kevin Wood

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Re: Using a multimeter
« Reply #39 on: 14 September 2009, 18:06:24 »

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Well thats a pretty fool proof one.....as you wont be allowed to site a kitchen in a temporary structure (conservatories are classifed as little more than sheds and hence how you get away with putting up such a god awfully insulated thing).

Yep. You're preaching to the converted here.  :y

kevin
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