[time-nuts] 60 Hz measurement party

Jim Lux jimlux at earthlink.net
Tue Jun 28 04:34:36 UTC 2011


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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