| Electronics > Repair |
| Fluke 8845A 6.5 digit Multimeter smoking transformer |
| << < (4/6) > >> |
| 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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