The 3457a is younger, has added functions, such as amps, and better
long term accuracy; the 3456a is just a DVM.
The previously posted link has a large comparative database:
http://electronicsandbooks.com/eab1/kb/k0zfca/i0zfca7_.htm
3457a tends to be have more unobtanium, compared to the 3456a. For
700 euros for a calibrated 3457a, its better to look at new 6.5 digit
DMMs such as the 34410a which I see farnell lists for 850 euros.
http://uk.farnell.com/agilent-technologies/34410a/multimeter-bench-61-2-digit/dp/1440376
or the cheaper 34401a or equivalents from other makers, Fluke, Keithley etc..
again, electronicsandbooks has a wonderful comparative listing.
At 07:21 PM 8/21/2012, Fred Schneider wrote:
I was aiming for the holy grale of meters and a 3457 turns out to be
a whole different beast. Someone I know bought a 3456 for 225 euro,
fresh calibrated, that is 6,5 digits too. So i wondered why is a
3457 so much more expensive.
Sincerely,
Marv Gozum
Philadelphia, PA
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