If both DMM meet your needs, then the chance it will work coming from unknowns via eBay, and easier to maintain DIY is your goal, the 3456a. If you need more updated features including amps but are willing to risk requiring a factory cal, repair and the costs it requires, 3457a.
3468a is not a system class DMM, but a general purpose DMM very much like he 3478a but is much cheaper as it doesn't support the GPIB bus but uses the then popular HP calculator interface. The 3479a is not a DMM, AFAIK.
--- In hp_agilent_equipment@..., Jeff Machesky <jeff@...> wrote:Of the two meters, 3456 or 3457 which would be the smarter
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purchase ?
In the interest of saving space I'm also looking at the HP 3468a or
3479a. I'm not seeing a major difference between the two except for
perhaps some lower ranges on the 3478a. Any helpful info regarding those
devices.
If I can score a 3456a or 3457a for a reasonable price then I'll be
heading that direction. At the moment I'm stuck doing projects with
4,000 count B&K meters and a 20,000 DMM on the Tek 2465 which is not in
cal to it's spec. So my purchases will be pretty soon. I have a Fluke
8010 on the way which I'm sure will also need cal.
Thanks,
