Products > Test Equipment
Keysight's new 34465A (6.5 digit) and 34470A (7.5 digit) bench multimeters
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6thimage:

--- Quote from: EEVblog on March 13, 2015, 04:50:33 am ---
--- 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.

--- End quote ---

There is no point in dumping the firmware - it is the same for all 4 meters (34460/61/65/70A). I'm guessing the model number is tied to the serial number, and is stored in an eeprom or maybe in the processor's internal flash memory.

I'm guessing it is theoretically possible to hack the 34465A into the 34470A as they share the same board. But this board is different to the one used in the 34460/61A, in a few small ways. Additionally, the 34465/70A have a temperature sensor near the front connectors for cold junction compensation, which the 34460/61A don't have.
KedasProbe:
Hhmmm the hacking started already?
The first prize for 'upgrading' the firmware for 34465A to 34470A  is an extra digit on your display :), don't forget the DIG option ;)

If a serial stored in the device is the key for 70A or 65A then maybe the firmware has to be changed to swap the logic which serial is 70A.   (just an idea)
babysitter:
The User and Service Manual claims that turning the screw that holds the metal shield in place changes calibration - did anybody confirm it yet?
splin:
About that ARM processor on the bottom of the board.

http://www.ti.com/product/lm3s1d21


--- Quote ---This product is being discontinued. Orders for life buy purchases are available

TI does not recommend using this part in a new design. This product continues to be in production to support existing customers. TI suggests designers consider TM4C12x as an alternative family or series of devices for use in new designs.
--- End quote ---

Ooops!

Splin
6thimage:

--- Quote from: splin on March 13, 2015, 02:32:50 pm ---About that ARM processor on the bottom of the board.

http://www.ti.com/product/lm3s1d21


--- Quote ---This product is being discontinued. Orders for life buy purchases are available

TI does not recommend using this part in a new design. This product continues to be in production to support existing customers. TI suggests designers consider TM4C12x as an alternative family or series of devices for use in new designs.
--- End quote ---

Ooops!

Splin

--- End quote ---

Texas Instruments did that with the Stellaris range of microcontrollers a few years back - overnight, and out of nowhere, they discontinued their entire range.
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