gary miller 2024/06/06 21:54
How do you know the cable is good?
Calibrate at port 1 of the VNA
Attach the cable under test to VNA port 1, terminate the cable with the short,
and measure the reflection coefficient magnitude in dB.
An ideal cable will measure 0 dB independent of frequency. For a non ideal
cable the cable loss will be one half the measured reflection coefficient in
dB, at each frequency.
I hope this helps.
> On Jun 6, 2024, at 09:20, Melih Akalın <melih.akalin@gesk.tech> wrote:
>
>
>
>
> Hi Gary,
>
>
> As ı understand it There seems to have been some confusion while the emails
were being transferred to you. I'm sendin you to same cable calibration test
results.
>
>
> When we calibrate on your suggested type result is not a change so that I
share the images with e delay. You can see the belowed image with new
calibration photos. ( We try to 2 different RF demo kit and 4 different RF
cable and result not change.)
>
> NOTE: The device has been factory reset before the calibration.
>
>
> 1) How can we know the this cable are fine?
>
> 2) How can we verify the VNA, cable and the all test thing?
>
>
> We are looking forward to your answers.
> Thanks for your help
>
>
> **TEST PICTURES**
>
>
>
> 1) AFTER CALIBRATION
>
>
>
> <image.png>
>
>
>
> 2) CALIBRATION VERIFY
>
>
>
> <image.png>
>
> 3) RF DEMO KIT OUTPUT.(SECTION 10 INDUCTIVE LOAD)
>
>
>
> <image.png>
>
>
> 4) RF DEMO KIT OUTPUT.(SECTION 9 CAPACITIVE LOAD)
>
>
> <image.png>
>
>
>
> 5) RF DEMO KIT OUTPUT.(SECTION 1)
>
>
>
>
> <image.png>
>
>
>
> 6) RF DEMO KIT OUTPUT.(SECTION 4)
>
>
> <image.png>
>
>
>
>
> Saygılarımla / Best Regards,
>
> **MELİH AKALIN**
> R&D Embedded Hardware Design Engineer
>
> ---
>
> Y.T.U Davutpasa Kamp. Teknopark
> B1 Blok No:405 Esenler / Istanbul
> [www.gesk.com.tr](http://gesk.com.tr/tr/)
>
> **m:** +90 530 930 42 38
> **t:** +90 212 220 22 34
> **e:** [melih.akalin@gesk.tech](mailto:melih.akalin@gesk.tech)
>
> |
>
>
>
>
> ---
>
>
>
>
>
> 06.06.2024, 08:28, "gary miller via groups.io"
<gary_e_miller=yahoo.com@groups.io>:
>
>>
>>
>> The cable used to perform the calibration is a component in the calibration
and must mot be temoved.
>>
>>
>>
>>> On Jun 5, 2024, at 8:59 AM,
[melih.akalin@gesk.tech](mailto:melih.akalin@gesk.tech) wrote:
>
>>
>>>
>>>
>>> Hi Dear All,
>>>
>>> We have an many of the issue with NANOVNAF-V2 and need to support from
your side. First of all I want to share with you our's product information.
>
> Hardware: Rev.C
>>>
>>> Firmware v0.5.0
> Build time: Jun 24 2022
> Velocıty Factor: %70
> Mode: Bandpass
>
> 1) We made a calibration with OSL connectors( Short, Open and Load). After
the calibration, we change the cable(Cable is original one) with UMCC one and
made a electrical delay. the result was not okey.(you can see the every steps
image below) Depend on a that issue RF Demo kit's results not matched.
>>>
>>>
>>>
>>>
>>>
>>> <dummyfile.0.part>
>>>
>>>
>>>
>>> 2) After that issue I did recalibrate the device with cable and over the
RF demo kit's OSL port. The result wasn't change.
>
>>>
>>> <dummyfile.1.part>
>>>
>>>
>>>
>>> **Note** : After the calibration, I tried to verify and there isn't any
issue. Resistive measurement is ok but the capacitive and inductive
measurement is really bad.
>>>
>>>
>>>
>>> Where am I made an fault?
>>>
>>> Is there anyone live that issue?
>>>
>>>
_._,_._,_
* * *
