[volt-nuts] Quality Multimeters

[Roy Phillips]

Hello to all the members

There has been considerable discussion on the time-nuts site regarding the HP3458, which I would like to add to my other HP DVM's. This is a problem due to the relative rarity, and therefore cost in the UK. But I have got a 3457 and a 3456 in my lab.
What is the general opinion of the 3457 - is it a good deal short of the 3458 - I gather it is all down to the voltage reference device. 
It would seem that obtaining a good DC voltage standard (mine is a Fluke 731B), is much more difficult than the frequency standard, with a heap of GPS and other gear at inexpensive price levels. Any good designs for this purpose, or is it best to find commercial products.
Any advice on these matters would be welcome.
Roy