On 11/30/2011 3:06 PM, Hal Murray wrote:
I hooked up a 47k resistor from line to the 50 ohm input of my 5334B and it
"just worked."
That's something I wouldn't do. It's too easy to forget to push the 50 ohm
button. I might do it if I had a handy 50 ohm terminator built into a BNC
pass through. That would be easy to verify with a quick glance.
The unit is specified to be able to handle 200 volts DC + peak AC on the input
in high impedance mode either X1 or X10.
I just tried it and it has no problem with it.
I am watching the 60 Hz drift all around as I type this (although not all
that far, seems to be holding within 0.01 Hz tonight).
I'm surprised you are that close. How long have you been watching?
A couple of hours.
I think 0.1 Hz (low) is where the US power companies have to file paperwork
so they try (very) hard to avoid getting that low.
Here is what I saw. Each data point is averaging over 10 seconds.
http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz-Jul11-12-freq.png
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