[time-nuts] R&S XSRM Rubidium Standard

[KA2WEU at aol.com]

And if the performance is not validated, then they fix it.. I hope.
 
I do a lot of phase noise measurements , spectrum analysis and power  
measurements  and S/N ratio measurements so I need correct tool .
 
 

 
 
In a message dated 9/17/2017 11:23:31 A.M. Eastern Daylight Time,  
scmcgrath at gmail.com writes:

As to  the point most modern instruments have self calibration,   Most of  
the time 'calibration' is simply the performance check adjustments are not  
performed unless necessary 

The difference being the instruments used  in performance test are 
traceable to a national standards body.

So  whats referred to as calibration is in reality performance  validation.

How do I know this by becoming friendly with the local lab  and years ago 
when i worked for govt i used to moonlight at one of the local  cal labs.

> On Sep 17, 2017, at 8:57 AM, KA2WEU--- via time-nuts  
<time-nuts at febo.com> wrote:
> 
> Modern test and radio  equipment have self calibration capabilities, 
older  
> analog do  not. Calibration is not always need for  just simple test, but 
  
> for specification conformation it is useful. A bit  of luck  also  helps.
> 
> 
> 
> 
> In a message  dated 9/17/2017 8:08:00 A.M. Eastern Daylight Time,  
>  drkirkby at kirkbymicrowave.co.uk writes:
> 
>> On 15  Sep  2017 10:45, "Scott McGrath" <scmcgrath at gmail.com>   wrote:
>> 
>> Precisely my point,   But when  purchasing i  expect to pay for a
> calibration at a  minimum.
> 
> I have on occasions  requested sellers to send  an item to the 
manufacturer
> (Agilent or Keysight)  for  calibration *before* shipping it to me, 
offering
> to pay the  calibration  cost, but stating that I expect a full refund if 
the
>  item fails the  calibration.
> 
> If a test equipment dealer  is confident that something is  working well,
> they should not  object to sending it to the manufacturer for  
calibration,
> as  long as the buyer is willing to pay.
> 
> Of course if a   seller knows little about something,  they are not going 
to
>  do  this,  but the item should be appropriately priced.
>  
> One UK seller  (grace1403) declined to send an Agilent N9912A  FieldFox to
> Agilent, because  "Agilent were too fussy"., failing  items for trivual
> issues.    But he did agree to send it to  one of the cal labs he uses. I
> thought it  was a waste of time  going to one of the less fussy outfits,  
 
> but
>  bought it anyway. It was then clear on receipt that it was faulty.   (The
> spectrum analyser functionality was ok, but it didn't work as  a  network
> analyzer).  He took it back,  but then  advertised it on  eBay 6 months
> later. When asked, he said  nothing had been done to  it.
> 
> eBay rules about who pays  the return shipping charge for an item  that is
> "not as  described' keep changing, and may be different on different   
sites.
> But on a heavy item shipped internationally,  the postage  cost  can be
> comparable or exceed the calibration   cost.
> 
> Dave.
>  _______________________________________________
> time-nuts   mailing list -- time-nuts at febo.com
> To unsubscribe, go to   
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and  follow the  instructions there.
> 
>  _______________________________________________
> time-nuts mailing list  -- time-nuts at febo.com
> To unsubscribe, go to  
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the  instructions there.