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Agilent L4411A Multimeter teardown

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plesa:
Today I needs to clean Agilent L4411A Mutimeter so I take few photos.
This multimeter is almost identical to Agilent 34411A. It is based on LM399 voltage reference and TrueVolt technology.
I just thinking about disconnecting internal fan to make it silent, PSU seems not to be hot too much (57°C ).

It does not have internal transformer, but switching PSU (Phihong PSA25L https://phihong.com/html/psa25l_25w_compact_pcb.html ).

I found more teardown photos on internet fo someone who will needs more details.
http://letsdisassembleit.com/print.php?news.4
For comparison with 34410A
http://letsdisassembleit.com/news.php?extend.2

It is pretty small (1U instrument) only little bit longer than 34411A units (same lenght as 34401A).
Ideal for automation or someone using Agilent DMM Connection utility/BechVue only.
Combined with  40 channel multiplexer L4421A it offer decent datalogger unit.

HighVoltage:
Thanks for showing us the insight of this instrument.
This L4411A cost Euro 2200 in Germany + VAT!
What makes this instrument so expensive, can not just be the 1U hight.
Somehow, I think I would prefer the 34401A or the 34411A for higher speed, but then, I never used the L4411A.

What are you planning to do with it?
 

plesa:
Yes, this is identical to 34411A, so the price is about 250USD higher than 34411A.
What it makes so expensive ( compared to 34410A - 1050 USD difference) is speed 50k reading/s, 1M memory, Analog level trigering and pre+post triggering feature
Missing feature on 34410A/34411A is the ratio measurement capability available on 34401A. Which is again available on 34461A.
It cannot be used as bench meter which is obvious, reading is also available on front panel (16x2 LCD) including IP adress.
I'm using it mainly as 4W thermometer and logging purposes with LabView or with DMM connection utility.

plesa:
Measured temperature on internal shield with disconnected fan 50°C, with fan connected 38°C and with open frame 40°C.
So keeping fan of on is must.
Today I also notices that banana sockets are nickel plated (difference to 34410A/34411A/34401A)
On internal photos is visible that they used tin coated faston for connecting input terminals, strange.
Eg. Keithley use gold plated banana sockets and pushon terminals not only on input terminal but also on voltage outputs and other banana terminals where emf is not so critical.
The amps wire is thinner than I will expect.

Muxr:
Thanks for sharing. Pretty cool piece of gear.

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