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Rms converter to match HP3400A?

ggabe

What is your suggestion to match the specs of the HP3400A AC millivoltmeter’s rms converter with analog parts available today? I’m drawing a line to exclude AD conversion and digital rms calculation. So it stays analog.

Below is the spec sheet:

image

Parents

  •    Your HP3400A is an old-school analog meter. I personally have a FLUKE 113 which does "true RMS" I got mine in a pawn shop for about 50 bucks. but if you like new Lowes (Box Store) is about 150 bucks. Now it's time to ponder Fix or Replace. If fix Did you check out the parts available from HP ops? Agilent or now Keysite??

  • in reply to phoenixcomm

    My motivation is “restoration”. This is the only analog instrument I have. I like the retro vibe of the mirrored gauge. Three different rms converters in my parts box already, time to make them work all together. Spicing it up to meet or exceed the 10MHz 5% rms measurement accuracy. Which can easily met by any of today's oscilloscopes, just that I like analog and want to push analog to its limits.

  • in reply to ggabe

    The meter movements on the 4xx series of HP instruments are really nice (so long as the paint hasn't flaked.)

    I'm not sure that I'm up to the challenge of attempting to replicate the external power sensor for my 435s but it would be nicer than altering the insides.

    MK

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