[time-nuts] Ebay FE-5680A Rb: Are they that good?

Javier Herrero jherrero at hvsistemas.es
Fri Dec 9 13:09:37 EST 2011


El 09/12/2011 18:54, Marco IK1ODO -2 escribió:
> At 18:23 09-12-11, Javier wrote:
>
>> I think that the low-band preselector (I don't remember the model) 
>> was more oriented to increase the dynamic range for EMC testing, 
>> rather than due to a crappy harmonic response of the analyzer. It 
>> also includes a preamplifier.
>
> Correct. 85685A, a very expensive (then and now) piece. The problem 
> there was to limit the impulse bandwidth of the frontend, harmonic 
> response was not a concern.
> In general, if you want to reliably measure harmonics with a S/A, you 
> have to cancel the fundamental, either with a notch or low pass filter.
Right (except I suppose that high pass, no low pass :) )

Regards,

Javier





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