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

--- Quote from: TiN on March 13, 2015, 04:35:55 pm ---U904 looks like ATMEL 34 I2C EEPROM. And U101 on front board looks EEPROMish too. Maybe Dave can use his MiniProg for them  :=\

--- End quote ---

I'd guessed that it was an Atmel eeprom, but I didn't recognise the code on it. U101 is not an eeprom - it is an RTC (on the left of it is a 32.768 kHz crystal). I'm not sure why Keysight (back when it was Agilent) decided to have an external RTC, when the main processor includes one.

Here is a table of what is on the 34461A's front panel:
U100TI 2051b 2bm a4djSingle power distribution switch <0.5 AU101ST M41T82RI2C RTC with battery switch overU102Maxim MAX3232ERS232 driverU103C6AF NZ04Possibly a Fairchild partU200Unpopulated 8 pinU201ST SPEAr320S-2Main processor, ARM926EJ-S core, <333 MHz, 32 kB embedded boot ROM, 8 kB embedded SRAM, crypto co-processor, touch screen interfaceU202SMSC 8710ALAN8710A (microchip) 10/100 ethernet transceiver - has auto-MDIX supportU203Micron NQ277 2TDI7MT29F1G08ABADAH4 1 Gb (128 MB) NAND flashU204Micron D9LHR 2NHI2MT47H64M16HR-3 1 Gb (128 MB) DDR2-667 333 MHz DRAMU205TI LC07A 26K C6ECSN74LVC07A hex buffer/driver with open drain outputsU300TI 54140TPS54140, 1.5A step down converterU304TI TPS 650701Single chip power IC for battery applications - can charge Li-ion batteries & has a resistive touch screen interface controllerU400ODNUnknown sot23-5 packageU401NXP LPC932A1FDH80C51, 8k flash, 768B RAM, 512B EEPROM - used for the soft power buttonU403TI L393LM393 dual voltage comparator
I have taken a few photos of my front panel (34461A) and combined them into this https://www.dropbox.com/s/3fjewu04suqs75r/front-panel.jpg?dl=0, which some people might find useful.

For comparison, this is radioFlash's front panel


The board is different on the left hand side of the battery - few passives & unpopulated footprints, but the logo has also moved which makes me wonder what is new that we can't see in this image.
kwass:

--- Quote from: 6thimage on March 13, 2015, 03:10:51 pm ---
I asked this question to someone in the know and they said that the fan moves very little air in normal lab conditions, but ramps up when the internal temperature rises (I'm guessing PWM). They also said that the drop in accuracy between the 34461A and the 34460A (the cheapest model without rear connectors and a fan) was largely due to the lack of a fan - with the 60A varying if the side holes are blocked by the handle.

--- End quote ---

On the 65a/70a the ACAL function should solve that problem nicely.  (I think that ACAL may have been added to the 60a and 61a too in the latest firmware.)
HighVoltage:

--- Quote from: kwass on March 13, 2015, 07:17:32 pm --- (I think that ACAL may have been added to the 60a and 61a too in the latest firmware.)

--- End quote ---
Based on what I read so far, ACAL is only available on the 34470A model
6thimage:

--- Quote from: kwass on March 13, 2015, 07:17:32 pm ---
--- Quote from: 6thimage on March 13, 2015, 03:10:51 pm ---
I asked this question to someone in the know and they said that the fan moves very little air in normal lab conditions, but ramps up when the internal temperature rises (I'm guessing PWM). They also said that the drop in accuracy between the 34461A and the 34460A (the cheapest model without rear connectors and a fan) was largely due to the lack of a fan - with the 60A varying if the side holes are blocked by the handle.

--- End quote ---

On the 65a/70a the ACAL function should solve that problem nicely.  (I think that ACAL may have been added to the 60a and 61a too in the latest firmware.)

--- End quote ---

I have a 34461A and a pre-beta version of the firmware - the 34460/61A will not have ACAL, its a 65/70A feature (I think it requires the hermetically sealed Vishay resistor).
6thimage:

--- Quote from: HighVoltage on March 13, 2015, 07:43:05 pm ---
--- Quote from: kwass on March 13, 2015, 07:17:32 pm --- (I think that ACAL may have been added to the 60a and 61a too in the latest firmware.)

--- End quote ---
Based on what I read so far, ACAL is only available on the 34470A model

--- End quote ---

Have a look at the datasheet - 34465A supports ACAL.
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