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| Check your 34401A multimeter |
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| coromonadalix:
:palm: |
| Swake:
Verified an HP with serial US3606xxxx and revision 09-05-02 and same thing. Have added a double layer of kapton tape in between. Could not see if the coto had any damage without removing it because there might have been room for a third layer of kapton but certainly not a forth. |
| robert.rozee:
just added insulation to my HP34401A (sn 3146A78567). i used some 0.2mm thick insulating sheet that had been recovered from the HV backlight driver board on an old LCD TV. from this i cut a strip 15mm wide and 71mm long, folding into a "U" shaped with 35mm at one end, 28mm atthe other end, and 8mm between the two. this slipped down around E100 and was held securely in place just by friction. the 35mm end was against K101 so provided insulation for E101 as well, while the 28mm end provided extra insulation from the adjacent switch spring. no disassembly was required beyond the three screws holding the back and case sleeve on. see below. cheers, rob :-) |
| factory:
Just got round to completing the repair, cleaning & reassembly of my early 90s HP 34401A, I've found the same clearance issue between the relay & GDT, a piece of ex-Tek waveform monitor insulation sheet was cut to size and fitted. David Edit: Just had a quick look inside the 1999 edition, it has the same lack of clearance. |
| dimmog:
BTW, added another one to my collection. |
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