• EEVblog #485 – Agilent TrueVolt 34461A Multimeter Teardown

    Inside the new Agilent TrueVolt 34461A 6.5digit bench multimeter. A replacement for the venerable 34401A.

    Forum HERE
    Photos HERE

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      • Jonas

        Hey Dave,

        nice video. Although, fuses don’t seem to be easy to replace (and you don’t complain about it as usual :))! You really love this company I guess :)


        • http://www.eevblog.com EEVblog

          As I said, this is not a meter that is typically used in such a scenario were you would blow the fuses a lot (or at all). If that matters to you , then yes, it’s a disadvantage. This was not a review.

      • Worf

        FYI – Windows CE doesn’t spawn a debug shell unless one is attached to it, so there’s no actual commands available for anything other than the initial u-boot bootloader.

        THe only other use may be for serial debugging with the CE debugger, but that requires a special kernel.

        And how about a fundamental friday on how ADCs work?

      • daqq

        Thanks for the video Dave! Nice!

        It would be a nice topic for a fundamentals friday – various types of ADCs.

      • Marcin

        Windows CE ?
        Stupid and crazy
        The meter?

      • David

        Dave, looks like so many ‘new’ products and this is old wine in a new bottle, seeing TL072 and AD706 parts etc, some of old the wine is rather good. I’m not complaining as I have a 34401A and I’m glad they have got rid of THAT fluorescent display which was a step back when it came in and a pain in the arse to live with on both the DMMs and the DFM such as my 53132A, hate to think how often I’ve stared at the fluorescent displays guessing the correct interpretation of commas and decimal points.

      • Lucas


        Thanks for teardown. When you do the review on the unit could you look into the very low voltage RMS accuracy. I have a 34401A and find it cheats with zeros at low (<1mV) values. I do a lot of low noise analog stuff and it bugs me. So I have to keep a 3400A around to check it ( 60 tech bettering 90 tech ! ). Anyway if you could look into it with your yummy precision divider it would be appreciated.

        These blokes in the states comment on the low reading errors http://www.gellerlabs.com/34401A%20AC%20zero.htm



      • http://- Michel

        Hello Dave – I assume that calibration is misaligned after removing shield is true – I observed that removing similar shield on (vintage) Fluke 8060A affects the AC calibration – even closing the plastics might affect the calibration – therefor one of the big improvements has been that the DMM market leaders perform calibration after enclosure is completely closed – these days it is standard practice.

        You mention that the voltage reference is a Linear Technology brand – is it the LTZ1000A ?
        That one is not a second source but improved version of LM399 engineered by same people.
        It is still the most stable reference source on this planet and already formore than 2 decades …

      • http://www.gellerlabs.com Joe Geller

        In response to Lucas’s inquiry above:

        Making Low Level AC Voltage Measurements below 1 mV with the AgilentTM 34461A Digital Multimeter


        Our measurement of what happens below 10% scale is for those who inadvertently end up below 1 mV on the 100 mV ACV scale. This is below the bottom of the scale as defined by Agilent.

        The 34461A GUI is really beautiful and easy to use. The fan is very quiet now too.

        The voltage reference was in a similar four pin socket in the earlier 34410A which followed the 34401A.

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