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HP 400F/FL AC Voltmeter--Schematic?

Discussion in 'Electronic Repair' started by BetterMusic, Feb 26, 2004.

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  1. BetterMusic

    BetterMusic Guest

    Hi all:

    I recently acquired an HP 400FL AC Voltmeter and was planning to use
    it for audio work on my bench at home.

    However, it needs minor repairs and I badly need a schematic.

    I have a schematic for the 400E/EL and it is similar but not close
    enough--there are significant differences in the circuitry and all of
    the component identifiers are completely different.

    I can see that there are lots of similarities between the two, but
    lots of differences too. I don't know why, since the only difference
    in the spec is the addition of the switchable low pass filter.

    If anyone has a schematic or can point me in the right direction, I
    would be most appreciative. This meter has a value of perhaps $30 to
    $50 (working-not calibrated) and I hate to spend $30 additional for a
    complete manual which I really don't need.

    If anyone has one of these, I am certainly willing to pay reasonable
    costs for photocopying and postage for only the schematic.

    The email listed on this post should work for at
    least another 2 weeks and then it will be shut down by the email

    Or any answers can be posted here in the group.

    Thanks much

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