[time-nuts] another Ebay mixup

[Didier Juges]

Hi Said,

Good! But upsetting when sellers do not do their due diligence to 
properly pack and therefore damage equipment that would have been just 
fine. I was very upset, and at the end very lucky when I bought my 
8657B, which was shipped bare in a large box with what must have been 
not more than a dozen peanuts thrown in. The beautiful instrument was 
damaged, but luckily it was easily fixed. It could have been MUCH worse.

I think the single shot *resolution* of the TIC is 20pS, but in my 
experience the jitter is quite a bit more. So I think 50 pS STDEV with 
only 100 averages is in the ballpark.  Both of mine (5370A) are out of 
commission at the moment because of either poor sockets or tin whiskers, 
maybe both. For both units, I can take the chips out of the sockets and 
put them back in, and the instruments will work for a while, then they 
will loose their brains again. I have planned to replace the sockets, 
but have not come around to it yet. I use the 5334B in the mean time.

You may want to run it through the cal because there are a lot of things 
that can go wrong without providing obvious clues on these counters.

Didier

SAIDJACK at aol.com wrote:
>  
> In a message dated 6/8/2007 18:43:32 Pacific Daylight Time, didier at cox.net  
> writes:
>
>   
>> Well, his listing includes the serial number. He would not use the  same 
>> listing without at least updating the  S/N?
>>     
>
>   
>> Didier
>>     
>
>
>
> Hi Didier, I just got an email from him, he changed the picks today after I  
> asked him about it. The original listings didn't include the SN's.
>  
> I got my unit today, and the left handle is almost broken off. He didn't  use 
> bubblewrap :( If you guys order from him, make sure to require him to use  
> 1.5 - 2 inches of bubblewrap all around the unit.
>  
> The standard deviation of a 15ns cable-delayed signal is measured as 50ps  in 
> 100 averages.
>  
> Is that a good number for these units? I was expecting <20ps.
>  
> The frequency is in error of parts to the E-09 with an external 10MHz Cs  
> reference.
>  
> Maybe the unit just needs to be calibrated? Maybe it got shipping  damage?
>  
> bye,
> Said
>
>
>
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