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hp 403b DB meter

Discussion in 'Electronic Repair' started by Herbert Gillingham, Apr 15, 2006.

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  1. At a recent hamfest I purchased a HP 403 DB meter.On all ranges
    the meter needle remains to full scale.The batteries are missing.
    Can someone tell me the battery voltage? Any suggestions as to
    why the meter is at full scale? Has anyone a schematic of this unit?
    I have checked esr of cap as well as transistors.I would
    appreciate any comments.Please make comments in news group or at
    Many thanks herbert

  2. First of all, it is a RMS AC voltmeter that is also calibrated in dB,
    not DB. It has ranges from .001 VAC to 300 VAC full scale, or -60 dB to
    +50 dB. A lot of these types of meters require the batteries to be
    installed for the power supply to operate properly.

    is a "Buy it now" listing for the original manual. The seller might tell
    you what you want to know, or you can just buy the manual for about $22,
    including shipping. Then you will not only have a schematic, but the
    calibration data, too.
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