[volt-nuts] HP3458A SCAL hardware

[Greg Burnett]

Right. SCAL at 2 and 8 MHz will not affect performance below 100kHz. (The 
box self-adjusts its input attenuator audio frequency response during ACAL 
AC by adjusting for most-flat response of an internally generated 
squarewave.)


----- Original Message ----- 
From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Monday, June 21, 2010 3:25 PM
Subject: Re: [volt-nuts] HP3458A SCAL hardware


In message <A4745DFDC9CB48A0931823828C04651E at gb02>, "Greg Burnett" writes:

>Incidentally, due to the 3458A's input impedance imperfections as a 
>function
>of high-frequency, I really can't much imagine people using the 3458A AC
>mode for measurements above 100kHz anyway.

See, this sort of gets to the heart of my effort:  I don't care
about performance above 100kHz, but I have not been able to figure
out from the manual, what impact, if any, the 2MHz and 8MHz
calibrations have at lower frequencies.

If there is no relevant impact, My attenuator method will certainly
work for my purposes.


-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

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