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Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters

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6thimage:

--- Quote from: radioFlash on March 13, 2015, 12:33:16 am ---Interestingly, the 34470A's reference is attached by an 8 pin header (https://www.flickr.com/photos/eevblog/16171847343/). On the 34465, you can see there are 4 additional unpopulated holes by the LM399 reference:

https://www.eevblog.com/forum/testgear/keysight's-new-34465a-(6-5-digit)-and-34470a-(7-5-digit)-bench-multimeters/?action=dlattach;attach=141295

--- End quote ---

The 34465A and 34470A share the same board - look at the part number at the top of this image https://www.flickr.com/photos/eevblog/16765926266/.

I don't think there are any disadvantages of having the reference on a daughter board with a pin header interconnect. Putting a reference in a socket (i.e. the LTZ1000), rather than soldering it, is seen as being bad, as the stress on the pins affects the reference's output, but as there is a daughter board, that's not a concern. I'm guessing they went with this method, so that it is easier to thermally isolate the reference from the rest of the measurement board.

Edit:
Additionally, the 34461A board has the 8 pin header footprint - https://www.flickr.com/photos/eevblog/9090130444. With the board in the 34461A having a 34460A part number, it's pretty safe to assume that 34460/61As in the future will have the same board as the 34465/70A.

radioFlash:
Good catch. Here's a comparison of the 34465A to Dave's photo of the 34470A.

TiN:
If we can get firmware dump from 34470A, then some voltnuts could be able to upgrade their 34460/61's to 34470A for cheap (~$400USD, cost of LTZ reference, foil resistor and missing parts) since rest of hardware is same  ;D

I made animated gif for your enjoyment with all three..

EEVblog:

--- Quote from: TiN on March 13, 2015, 04:46:13 am ---If we can get firmware dump from 34470A, then some voltnuts could be able to upgrade their 34460/61's to 34470A for cheap (~$400USD, cost of LTZ reference, foil resistor and missing parts) since rest of hardware is same  ;D

--- End quote ---

Not sure if that's possible, but the 34465A to 34470A should be possible, just change the reference and firmware. Or if you were happy with the LM399 just change the firmware to get the extra digit.

EEVblog:
For those that want the two images of the 34461A and 34470A I have shot and scaled to match, here you go:
https://farm9.staticflickr.com/8721/16765926266_d30679e9d1_o_d.jpg
https://farm8.staticflickr.com/7606/16584505777_201128fea6_o_d.jpg

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