[time-nuts] 60 Hz measurement party
Mark Spencer
mspencer12345 at yahoo.ca
Tue Jun 28 16:09:28 UTC 2011
At the suggestion of another member of the list I added a low pass filter to the
input of the HP5370B and I also connected the door bell transformer to an un
shared branch circuit. After making these changes noise in the readings seems
to have gone away.
----- Original Message ----
From: Jim Lux <jimlux at earthlink.net>
To: time-nuts at febo.com
Sent: Mon, June 27, 2011 9:34:36 PM
Subject: Re: [time-nuts] 60 Hz measurement party
On 6/27/11 9:43 AM, Mark Spencer wrote:
> I'm not sure if the results I am seeing are valid or not. My signal source
> is a 16 volt doorbell transformer that feeds a voltage divider which in turn
> feeds my 5370B with an approx 2 volt sine wave. Setting the trigger point on
> the 5370B to 0 volts appears to provide the best results and the sine wave
from
> the voltage divider looks to be clean on my scope. But I'm wondering if
>changes
> in line voltage could be confusing things.
>
That's sort of why I was thinking of the sound card approach.. you sample it,
fit a sinusoid, and get the zero crossing time from the parametric fit.
Doorbell transformers have a lot of leakage inductance to limit the current (so
that shorting the output doesn't burn it up)
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