[time-nuts] Fast Rise/Fall Time Pulser

Larry McDavid lmcdavid at lmceng.com
Wed Oct 11 14:28:29 EDT 2017


The Leo Bodnar pulser output level is adjustable but at outputs higher 
than some 1 v P-P the rise/fall times increase. I reported the ~0.95 v 
P-P as what was reported on the datasheet for *my* pulser.

Ok, per Leo's August 7, 2017 post, the output device is a Maxim MAX3949. 
Mine is marked, "AJK  BAA." Does anyone know the origin or significance 
of that marking?

Per Leo's August 5, 2017 post, the pulser fastest rise time occurs when 
the output level is set to 820 mv and the scope reports 976 mvpp. That 
is consistent with what is reported for my pulser on the supplied test 
datasheet.

Why would you want to set the output level higher than that at which the 
risetime is fastest? ~ 1 vpp seems enough.

Larry


On 10/11/2017 8:29 AM, David DiGiacomo telists at davmar.org [TekScopes] wrote:
> On Tue, Oct 10, 2017 at 11:01 PM, Larry McDavid <lmcdavid at lmceng.com> wrote:
>  > Neither the Analog Devices nor the Maxim part (see below) data sheets
>  > suggest the markings actually seen on the device used on the Leo Bodnar
>  > pulser I received. As recently as July 8, 2017 Leo Bodnar described the
>  > device as "based on 572 comparator from AD" in a posting on EEVblog.
> 
> The Maxim datasheet doesn't say anything about the product marking.
> 
> Here's Leo's later post:
> https://www.eevblog.com/forum/projects/yet-another-fast-edge-pulse-generator/msg1275011/#msg1275011
> 
>  > One poster commented on the high pulse voltage of ±1 volt; that is not
>  > correct. The Leo Bodnar pulser output is about 0.95 v P-P.
> 
> It's adjustable up to 1.2VPP into 50ohms, or 2.4VPP open circuit.
> 
> Product page: 
> http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=124&products_id=295
-- 
Best wishes,

Larry McDavid W6FUB
Anaheim, California  (SE of Los Angeles, near Disneyland)



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