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| Old Fluke Multimeters |
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| med6753:
--- Quote from: GregDunn on October 13, 2018, 10:34:51 pm ---So perhaps I should stock up on relays in my next parts order just to be prepared for the inevitable. Have you looked at the 8800A relays yet? The BOM indicates that the two units use the same Fluke part numbers for the relays though perhaps not the same number of them. --- End quote --- Here's a peak inside my 8800A. The Ohms board has 4 reed relays which are 600 ohm coils and appear to be identical to the one's used in the 8600A so I will be replacing them with the same substitution. The AC board behind it apparently has 3 under that cover of a different part number and unknown coil resistance. I will be leaving those alone for now. |
| GregDunn:
The manuals I have give the same part for the 8800A AC board relays as the 8600A: Relay, reed SPST, 4.5V Fluke #357566 made originally by Coto Coil in Providence, RI. mfr #E8182 The Ohms board on both meters says Relay, reed SPST, 4.5V Fluke #357582, same mfr. #UF40070 Coto is still in business but they don't seem to have any cross-reference to their obsolete products. Looking up the UF40070 ultimately gives this link: https://www.lintechcomponents.com/product/5945-010140618 Can't find any data on the E8182 as yet. :( |
| med6753:
--- Quote from: GregDunn on October 14, 2018, 02:34:13 am ---The manuals I have give the same part for the 8800A AC board relays as the 8600A: Relay, reed SPST, 4.5V Fluke #357566 made originally by Coto Coil in Providence, RI. mfr #E8182 The Ohms board on both meters says Relay, reed SPST, 4.5V Fluke #357582, same mfr. #UF40070 Coto is still in business but they don't seem to have any cross-reference to their obsolete products. Looking up the UF40070 ultimately gives this link: https://www.lintechcomponents.com/product/5945-010140618 Can't find any data on the E8182 as yet. :( --- End quote --- You can bet that requesting a quote would result in taking out a mortgage to pay for them. :scared: |
| Martin.M:
Restoration Fluke 8300A Problem1: Last Nixie off. Problem2: Power switch always ON Scope pics: 1 = working Transistor, 2 = fail transistor, tested at C (= Anode Nixie) tested with Tek221, isolated ground free Found a bad Transistor going to Anode of the non working Nixi, swapped to BF421 = OK But the Nixi self seems to be defektive, the zero is mostly on and it fires multiple numbers, looks like a mechanical defekt inside, shorted plates. Displaying of 0 is allready, other numbers NOT. I have to look to buy a spare. greetings Martin |
| med6753:
--- Quote from: Martin.M on October 14, 2018, 09:36:11 am ---Restoration Fluke 8300A Problem1: Last Nixie off. Problem2: Power switch always ON Scope pics: 1 = working Transistor, 2 = fail transistor, tested at C (= Anode Nixie) tested with Tek221, isolated ground free Found a bad Transistor going to Anode of the non working Nixi, swapped to BF421 = OK But the Nixi self seems to be defektive, the zero is mostly on and it fires multiple numbers, looks like a mechanical defekt inside, shorted plates. Displaying of 0 is allready, other numbers NOT. I have to look to buy a spare. greetings Martin --- End quote --- I'll bet the shorted Nixie damaged the driver transistor. Hopefully you can find a replacement Nixie. |
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