[time-nuts] Re: HP 53132A - 5 GHz input 3 missing sensitivity

[Olivier ADLER]

Thanks James, but unfortunately i think that there is no sensitivity 
settings for the optional input 3.

The sensitivity seems fixed, accepting levels from -23 dBm to +13 dBm. 
The schematics does not show any adjustable gain circuits before the 
digital frequency divider.


Then i think that an MMIC amplifier is dead on the input 3 option board 
because the minimum level i need is - 5 dBm.


I think i'm going to open and check that. There are Schottky diodes at 
the input that could have been destroyed too.



Bests,

Olivier




Le 10/07/2026 à 14:31, James Reed via time-nuts a écrit :
> Dear Olivier:  Your HP 53132A has "adjustable" sensitivity.  I am attaching
> a screenshot from both the 53132A data sheet and from the operations
> manual. Each input channel can be adjusted for "Low", "Medium" or "High"
> sensitivity, as detailed on page 1-19 of the Operations manual.
>
> James Reed - KC3SGI
> 11492 Abbys Way
> Bridgeville, DE  19933
> (302) 604-1327
>
>
>
> On Tue, Jul 7, 2026 at 8:46 PM Olivier ADLER via time-nuts <
> time-nuts at lists.febo.com> wrote: