[time-nuts] HP5370A self test fault characteristics and diagnosis

Rex rexa at sonic.net
Fri Jun 19 05:53:03 EDT 2009


Bruce Griffiths wrote:

>What is the indicated std deviation of the delay between the STAR and
>STOP inputs when connecting the rear panel 10MHz signal to both START
>and STOP inputs using the STAR COM position of the channel mode switch?
>  
>
Bruce,

I don't think I understand exactly how to measure this.

First, let me say that this is a very early 5370A. It doesn't even have 
a 10544, it has the early crappy reference. Hence, I have been feeding 
it a better signal to the external ref input.

Now, I am assuming you are talking about measuring a version of this 
reference signal. I think you are saying, put the front panel switch to 
START COMMON. Are you saying to feed in phase inputs to both Start and 
Stop inputs? I thought Start Common tied them together. Then I have no 
clue how to gather a reading for std deviation.

Sorry if I am being dense. This counter, though very old, is new to me.

Thanks for the help and suggestions.





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