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| Old Fluke Multimeters |
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| bdunham7:
--- Quote from: NoisyBoy on January 23, 2023, 05:58:30 pm ---On my unit, SB1 to SB3 is wide open, that's what led me to think the primary failed. --- End quote --- Yeah, that seems conclusive... |
| NoisyBoy:
Thanks, if that's the case, does anyone know if there's a modern equivalent to that transformer for a drop in replacement? In the mean time, I will also power it up with a bench supply to make sure the rest of the meter is working correctly. Does applying +/- 19-20V at cap C17 and C18, along with +5V at C19 seem to be the consensus? |
| bdunham7:
--- Quote from: NoisyBoy on January 23, 2023, 07:03:43 pm ---In the mean time, I will also power it up with a bench supply to make sure the rest of the meter is working correctly. Does applying +/- 19-20V at cap C17 and C18 seem to be there consensus? --- End quote --- I don't think it needs to be that high, start with +/- 16V. And use current limiting to about 100mA or so. Something had to toast that transformer and if the meter came from North America, I doubt it was a 230V input accident. |
| NoisyBoy:
Great point, I will give that a try. It is a US model, it would be nice to be able to revive it after all these years if it is just the transformer. As along as I can find a replacement. I wonder if a power surge might have done the damage to it. The meter is pristine otherwise, I had to break the original Fluke stickers at the screw to open it. |
| med6753:
--- Quote from: NoisyBoy on January 23, 2023, 07:11:44 pm ---Great point, I will give that a try. It is a US model, it would be nice to be able to revive it after all these years if it is just the transformer. As along as I can find a replacement. I wonder if a power surge might have done the damage to it. The meter is pristine otherwise, I had to break the original Fluke stickers at the screw to open it. --- End quote --- There are usually several "for parts or not working" 8000A's on Ebay that can be had for pretty cheap. |
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