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Vertical OFFSET #consolecommands #improvement #firmware #measurement #nanovna-h4

Kees
 

Hi Developper Team,

Since a week I have a NanoVna-H4 with SW version 0.5.0
It is a nice instrument for investigation of someone's designs.
After playing with the possibilities of this instrument
I miss the vertical OFFSET menu to give the REFERENCE a value (dB) in case the measurement result is falling outside the screen.

If for example I like to see the measurement result of a device with an attenuation of about 10 dB with a scale of 1 dB/div halfway the height of the screen,
then I can put the REFERENCE at 8 and give an OFFSET value of -4 dB (to the REFERENCE).

It may be that this OFFSET menu is discussed earlier but is perhaps not implemented because there was not enough memory for it in the NanoVna-H4.
Or the OFFSET value may be implemented in a PC application like NanoVna Saver?

Thank you for your effort in advance.
Kees, PE0CWK
 

Rees,
At 1dB/div, a REFERENCE POSITION value of 14 puts a -10dB response at mid-screen. Is that what you are looking for, or do you want a more intuitive entry method?
--John Gord

On Sat, Jul 18, 2020 at 12:40 PM, Kees wrote:


Hi Developper Team,

Since a week I have a NanoVna-H4 with SW version 0.5.0
It is a nice instrument for investigation of someone's designs.
After playing with the possibilities of this instrument
I miss the vertical OFFSET menu to give the REFERENCE a value (dB) in case the
measurement result is falling outside the screen.

If for example I like to see the measurement result of a device with an
attenuation of about 10 dB with a scale of 1 dB/div halfway the height of the
screen,
then I can put the REFERENCE at 8 and give an OFFSET value of -4 dB (to the
REFERENCE).

It may be that this OFFSET menu is discussed earlier but is perhaps not
implemented because there was not enough memory for it in the NanoVna-H4.
Or the OFFSET value may be implemented in a PC application like NanoVna Saver?

Thank you for your effort in advance.
Kees, PE0CWK
Kees
 

John,

Thanks. Nice to read that it is possible what I was looking for. Sure.
I discovered that it is possible to position the reference point not only on the gridlines, but also between them.
However I expected that only integers 0...8 were allowed.
It might be more intuitive when the existing Reference button changes its name into Reference Position
and a new button in the menu is added with the text Reference Level.
Then the Reference Postion button accepts only integer values between 0 and 8 and the Reference Level button accepts any real value between, for example,-99.0 and +99.0 (dB).
The chosen Reference value for the (active) channel should then be visible anywhere along the edge, outside the grid of the display.
In this way you can show the trace how you want it in combination with the scale setting (scale/div).
If I have it right you now can select any real value for the scale/div as well.
I think it should then be more intuitive to select from fixed values like (0.1, 0.2),1, 2, 5, 10, or 20 dB/div.
One of these values are then visible on top of the display.
I have described the LOGMAG but I can imagine that something like written above can also be made for the other formats.
During a lot of years I have used several type of Scalar- and Vector Network Analyzers.
With that experience I tried to play with this NanoVna-H4 as the operation of the buttons is concerned.
May be it is worth to give it a chance for implementation in the NanoVna-H4.

Is it worth to add the limits of what you may use for that selection at the input field of the num. keyboard?
I have tried to choose a number for the display brightness. Finally I tried 2000,
but is it not more intuitive to select from 1 to 5 as an example?
At the moment I see there always a big integer value with one red digit. Have these a special meaning?
 

Kees,
Personally, I am happy with the present scheme for the Reference Position.
Regarding the red digit on the data entry line: More recent firmware versions seem
to behave differently. Try some out and see if you like them.
--John

On Mon, Jul 20, 2020 at 02:02 PM, Kees wrote:


John,

Thanks. Nice to read that it is possible what I was looking for. Sure.
I discovered that it is possible to position the reference point not only on
the gridlines, but also between them.
However I expected that only integers 0...8 were allowed.
It might be more intuitive when the existing Reference button changes its name
into Reference Position
and a new button in the menu is added with the text Reference Level.
Then the Reference Postion button accepts only integer values between 0 and 8
and the Reference Level button accepts any real value between, for
example,-99.0 and +99.0 (dB).
The chosen Reference value for the (active) channel should then be visible
anywhere along the edge, outside the grid of the display.
In this way you can show the trace how you want it in combination with the
scale setting (scale/div).
If I have it right you now can select any real value for the scale/div as
well.
I think it should then be more intuitive to select from fixed values like
(0.1, 0.2),1, 2, 5, 10, or 20 dB/div.
One of these values are then visible on top of the display.
I have described the LOGMAG but I can imagine that something like written
above can also be made for the other formats.
During a lot of years I have used several type of Scalar- and Vector Network
Analyzers.
With that experience I tried to play with this NanoVna-H4 as the operation of
the buttons is concerned.
May be it is worth to give it a chance for implementation in the NanoVna-H4.

Is it worth to add the limits of what you may use for that selection at the
input field of the num. keyboard?
I have tried to choose a number for the display brightness. Finally I tried
2000,
but is it not more intuitive to select from 1 to 5 as an example?
At the moment I see there always a big integer value with one red digit. Have
these a special meaning?

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