[time-nuts] Power glitch, Menlo Park CA, 4 seconds
lists at lazygranch.com
lists at lazygranch.com
Tue Aug 7 23:11:28 UTC 2012
I would suggest an external usb soundcard. Go through ebay and find the kind in the blue metal case. You can actually pull the card if you want physical access. I have used that model, which uses Cmedia chipset, with the line input.
Even with protection circuitry, I would be concerned about blowing up the PCs soundcard. Better to blow up an external card.
I'd call that an outage!
------Original Message------
From: Hal Murray
Sender: time-nuts-bounces at febo.com
To: time-nuts at febo.com
ReplyTo: Discussion of precise time and frequency measurement
Subject: [time-nuts] Power glitch, Menlo Park CA, 4 seconds
Sent: Aug 7, 2012 3:09 PM
I'm finally starting to capture audio data so I can see what happens when a
cycle gets lost or added.
We lost power for a few seconds yesterday. Here are a few graphs:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-06-a0.png
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-06-a1.png
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-06-a2.png
(The vertical scale is 16 bit audio rather than volts.)
I'm seeing glitches like this:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-07-a0.png
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-07-a1.png
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-07-a2.png
The PPS side just keeps ticking along cleanly. I'm guessing ground problems,
in part because I'm using the mic input because I can't get the audio mux to
switch to line-in.
Any Linux audio wizards here? If so, please contact me off-list.
--
These are my opinions. I hate spam.
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