Forgive my ignorance, please, but what it the red cap for that is included with the test bugs.  Thanks!

dust cyap to protect the ports if not used?!?

Am 26.03.2022 um 11:09 schrieb Anthony:

> Forgive my ignorance, please, but what it the red cap for that is
> included with the test bugs.  Thanks!
>

Way to big for that. I've concluded that there is no real purpose and
that it was put on there to make people ask questions. LOL. If it was to
keep debris out, why no protection on the open and short? See, another
question.

Chuck





On 3/26/2022 8:15 AM, Siegfried Jackstien wrote:

>
> dust cyap to protect the ports if not used?!?
>
> Am 26.03.2022 um 11:09 schrieb Anthony:
>> Forgive my ignorance, please, but what it the red cap for that is
>> included with the test bugs.  Thanks!
>

On Sat, 26 Mar 2022 03:09:31 -0700
"Anthony" <n2ki.ham@gmail.com> wrote:

> Forgive my ignorance, please, but what it the red cap for that is included with the test bugs.  Thanks!

It's to protect the cal standards against dust and grit ingress, really
you should put one on each standard but the load is probably most
susceptible to contamination, the open least and the short can simply
be blown clear of any dust if you don't have a cap.

The cal process is fairly resilient at the frequencies this VNA can
reach, it gets much more difficult when you get to 13GHz or so and
higher because the wavelengths are so much smaller and a mis-seated
connector can produce significant phase errors.

--

Brian Morrison

"I am not young enough to know everything"
Oscar Wilde

Thank you for the explanation Brian. This would explain why they only
provide 1 cap and it was on the load.

Regards,

Anthony (N2KI)









On Sat, Mar 26, 2022 at 10:12 AM Brian Morrison <bdm@fenrir.org.uk> wrote:

> On Sat, 26 Mar 2022 03:09:31 -0700
> "Anthony" <n2ki.ham@gmail.com> wrote:
>
> > Forgive my ignorance, please, but what it the red cap for that is
> included with the test bugs. Thanks!
>
> It's to protect the cal standards against dust and grit ingress, really
> you should put one on each standard but the load is probably most
> susceptible to contamination, the open least and the short can simply
> be blown clear of any dust if you don't have a cap.
>
> The cal process is fairly resilient at the frequencies this VNA can
> reach, it gets much more difficult when you get to 13GHz or so and
> higher because the wavelengths are so much smaller and a mis-seated
> connector can produce significant phase errors.
>
> --
>
> Brian Morrison
>
> "I am not young enough to know everything"
> Oscar Wilde
>
>
>
>
>
>