Electronics > Repair
Fluke 8845A 6.5 digit Multimeter smoking transformer
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coromonadalix:
@Murta79

Even if the meter still work,  the x-former has heated and fumed, it is a future failure ....  i would order one

because layers of varnish / insulation may have heated up and efficiency has reduced

Acting like this is kinda dumb   no offence
murta79:
@drhex
It was a small ceramic capacitor so should not contain any dielectric. My bet is also on burnt board becoming conductive.
murta79:
@coromonadalix
Yes, while this is true.. This transformer is not something you just order from distributor. I might be lucky to find a cheap broken instrument on ebay which can act as a donor, I´ll keep looking.
Another possible solution would be to order a standard transformer just for the +/-20V rail.
Kleinstein:
MLCC can fail short from cracks caused be mechnical stress. Tantalum capacitor may also fail with a short, but as an additional danger a power full supply (e.g. > 2 A) could heat the capacitor so much that it ignites internally and produces some really intense heat / flame to cause more damage and smoke.
That extra fire is specific to tantalum capacitors, especially the old style drop form factor.
coromonadalix:
@Murta   dont forget  the same one Tektronix branded  dmm 4050  if i recall .... 

ask  Tek  if they have this transformer available, you never know  ....

a thread about it

https://www.ittsb.eu/forum/index.php?topic=1532.0
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