From: Arny Krueger on 30 Nov 2009 07:33
"geoff" <geoff(a)nospam-paf.co.nz> wrote in message
> Phil Allison wrote:
>> "geoff" <geoff(a)nospam-paf.co.nz>
>>> Yes, the 'headroom' ascertion seems a bit odd to me too.
>>> It would be nice to know exactly how this apparent failing actually
>> ** The XTA DP226 displays a parameter called "Headroom".
>> Obviously allows one to tell immediately if a new input IC is up to
>> scratch or not .....
Not so much.
> Not from what I read. - it's not some sort of internal self-test of
> levels at all.
> From the descriptions of the various instances of 'headroom' in the
> manual, they are simply level indications/warnings wrt max unclipped
> output level.
> But I only had time to skim the manual and as usual you are doubtlessly
I found two mentions. They lead me to believe that they relate to unclipped
input level, which varies depending on how the built-in limiting is set.
No way do they indicate subtle aspects of op amp performance.