Re: Cleaning the front of the scope


n4buq
 

Hi David,

Good deal. If I'm not mistaken, if you get the voltage calibrations done, provided the precision resistors for the various Ohms ranges are still good, then I think the Ohms mode is calibrated in the process. I see pots in series and parallel with the meter movement and if those have been set incorrectly, it will affect most, if not all, modes/ranges.

While short, low-resistance, leads are good, they're not all that critical for most resistance measurements. You'd most likely only be introducing a few extra Ohms which doesn't really matter that much if you're measuring resistances of hundreds or thousands of Ohms with normal tolerances.

Good luck with it.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "David Berlind david@berlind.org [TekScopes]" <TekScopes@yahoogroups.com>
To: TekScopes@yahoogroups.com
Sent: Friday, February 24, 2017 1:28:00 PM
Subject: Re: [TekScopes] Re: Cleaning the front of the scope

Hi @barry...

meant to say thank you for pointing me back to the Simpson260 site. I had
been there for both the user and repair manual but didn't think to look
harder for a separate calibration manual. In fact, there is one there for
my meter and it looks like it was prepared for the military. So, good news
is that there's a calibration manual and I'll probably be able to get the
volts dialed in just as soon as I can hook up to something with more than
250 volts (like an amp that I don't currently have in my possession). Bad
news is that there's no calibration for ohms. Slight silver lining is that
there's a footnote that says to use short test leads when doing resistance
testing. So, I need to build or acquire some leads that are shorter than
the ones I've got to see if that works.




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