Author Topic: Identify small component  (Read 920 times)

Offline dsk

  • **
  • Posts: 4174
Identify small component
« on: September 26, 2012, 03:05:42 PM »
My old Fluke meter has just started to behave strange, and the limited lifetime warranty is really limited, so its no good idea to send it to service. (15-20 years old)

Inside I located a strange looking component (capacitor?) Far to small to read the value, but the scanner did it  ;D

What is it (what to order as spare)

dsk

Offline Bill

  • **
  • Posts: 601
Re: Identify small component
« Reply #1 on: September 26, 2012, 06:24:07 PM »
DSK -

The "9725" looks like a date code.

"1-2 KV" is probably a voltage, but what voltage? Capacitors and diodes have a voltage - but not a voltage range. Perhaps a varistor sort of thing? It looks like it says "Murata", a company that makes a lot of small components, including capacitors.

I don't see any "value" in the usual sense. Is there any more writing on the other side? Colored dots?

Who put the saw kerf in the top?

Given your model number, you should be able to go to the Fluke web site (or others) and find a manual for your meter. Look up the schematic - you should be able to identify the part.

Bill
« Last Edit: September 27, 2012, 09:17:38 AM by Bill »

Offline rdelius

  • **
  • Posts: 2381
Re: Identify small component
« Reply #2 on: September 26, 2012, 08:38:53 PM »
I think the capacator was cut to adjust the value when calibrating the meter

Offline Bill

  • **
  • Posts: 601
Re: Identify small component
« Reply #3 on: September 27, 2012, 09:24:54 AM »
RDelius -

Aha! That makes sense. I went looking for laser-trimming of resistors (fairly common), found nothing, and went no further.

If this is a cap, its value would most likely have an effect only on the AC portions of the operation. Perhaps a frequency measurement? So we get back to the original question - "the meter has started to behave strange" - so I have to ask Strange in what way? In what operations?

I suppose I would start by drawing a business card through the kerf, perhaps with a drop of isopropyl alcohol, in case there is some crud in there. But I would still go look for a schematic.

Bill
« Last Edit: September 27, 2012, 05:08:21 PM by Bill »

Offline paul

  • *
  • Posts: 47
Re: Identify small component
« Reply #4 on: September 27, 2012, 01:51:20 PM »
Comparing that shape to a Murata catalog I would have to say that is more likely to be some sort of resonator or filter.

Offline dsk

  • **
  • Posts: 4174
Re: Identify small component
« Reply #5 on: September 27, 2012, 03:34:44 PM »
 :D
When i realized the cut was made, and not only a crack, I soldered it back, and I don't know why, but it seems like the meter is working quite accurate now. :)

I think we may do kind of "close the case".

Thank you for all those hints.

dsk

Offline twocvbloke

  • **
  • Posts: 4847
  • W.E. 500 DM
Re: Identify small component
« Reply #6 on: September 27, 2012, 04:15:59 PM »
:D
When i realized the cut was made, and not only a crack, I soldered it back, and I don't know why, but it seems like the meter is working quite accurate now. :)

Could have just been a dry solder joint then, those often cause weird issues in some electronics... :)

Offline G-Man

  • **
  • Posts: 1957
Re: Identify small component
« Reply #7 on: September 27, 2012, 10:39:30 PM »
Spark-Gap for over-voltage protection - safety