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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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