[volt-nuts] HP 3458A/HFL : looking for information/photos/fw

[acbern at gmx.de]

The value of the HFL is that by spec, it is better. So you can use its improved values in your uncertainty budget. If you do an upgrade yourself, you cannot rely on that. So you have to characterize your instrument after that. But you can as well do that with the standard meter as-is, and probably end up with results as good as the HFL, especially if it is a meter that has the VHP101 resistor installed (ACAL does the rest). 



> Gesendet: Mittwoch, 14. September 2016 um 07:16 Uhr
> Von: "Tom Knox" <actast at hotmail.com>
> An: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
> Betreff: Re: [volt-nuts] HP 3458A/HFL : looking for information/photos/fw
>
> Purchased new the HFL 3458A is exceptional. That said, it is my understanding that the HFL has the exact same circuit topography but uses select parts. Now here is where things get fuzzy, in the case of used 3458A's the parts often improve with age. So it is difficult to know without characterizing you meter as it ages as well as detailed knowledge/data on other 3458A's the degree of improvement if any and therefore whether the expense would be justified. Or if the new components would age as gracefully. I am not sure of exact firmware differences, perhaps someone can add information on that. Over the years I have seen a number of 3458A regardless of options that dramatically exceed their specs. The point is if you have one of those "golden" 3458A's don't let go of it. I hope that helps.
> 
> Cheers;
> 
> 
> Thomas Knox
> 
> 
> 
> ________________________________
> From: volt-nuts <volt-nuts-bounces at febo.com> on behalf of John Phillips <john.phillips0 at gmail.com>
> Sent: Tuesday, September 13, 2016 10:23 PM
> To: Discussion of precise voltage measurement
> Subject: Re: [volt-nuts] HP 3458A/HFL : looking for information/photos/fw
> 
> While talking with hp I was told the options Fluke orders. All are
> available to anyone who wants to buy one.
> 
> On Tue, Sep 13, 2016 at 9:06 PM, Illya Tsemenko <illya at xdevs.com> wrote:
> 
> > Hello to all volt-nuts,
> >
> >
> >
> > Considering to pimp-up my DVM for a while, but would like to know first if
> > anyone here saw actual PCB photos or have any information of what hardware
> > actually different in Fluke's HFL version of 3458A. Based on Fluke's manual
> > DC reference (A9 PCBA) and reference resistors on A1 PCBA got improvements.
> > Firmware is also likely to be bit different, as HFL comes with
> > preprogrammed macro's on keypad.
> >
> >
> >
> > If anyone have information about HFL, or have access to such instrument,
> > I'd appreciate any hints and details.
> >
> >
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> 
> 
> --
> 
> *John Phillips*
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