Products > Test Equipment
Pocket-Sized 6 GHz 1 TS/s ET Scope
<< < (50/107) > >>
joeqsmith:
About 48 hours of running various settings, signals and the hardware appears stable. 

The new software seems to cover the basics.   If I change the waveform,  do I have to delete all the min / max waveforms and recreate them?  There is no simple reset?   Yes, I read the manual.  So, simple example.  Connect your LiteVNA to channel 1.  Set the Lite to 1GHz CW.   With your software, enable the min/max.   Now set the Base to 10ns / div.   Let it sweep.  Now set it to 100ps.    I am able to reproduce this. 

Now change the Base to 200ps then back to 100ps.  All it correct, except, note on the far right.       

SJL-Instruments:

--- Quote from: joeqsmith on February 04, 2024, 12:16:09 am ---If I change the waveform,  do I have to delete all the min / max waveforms and recreate them?  There is no simple reset?   Yes, I read the manual.  So, simple example.  Connect your LiteVNA to channel 1.  Set the Lite to 1GHz CW.   With your software, enable the min/max.   Now set the Base to 10ns / div.   Let it sweep.  Now set it to 100ps.    I am able to reproduce this. 

Now change the Base to 200ps then back to 100ps.  All it correct, except, note on the far right.       

--- End quote ---
Thanks for the feedback. We'll add a "clear" button to the official release, and/or mark the waveform data as invalid after the timebase is changed. For now, you can change the formula (to e.g. "maxhold(CH1)+1"), press enter, and change it back. (Or you can delete and recreate the waveforms, as you stated.)
joeqsmith:
Overall, the new software seems easy enough to use.    Manual is coming along.     

Maybe consider pressing the Min/Max Hold once they have been enabled, resets or erases the waveforms rather than adding more of them.   How many min max waveforms for channel 1 does one need?   :-DD 

3.4.4 FFT does not mention the THD feature.   The software shows invalid.  Is it implemented and not documented, or just a place holder?

One person had asked about tracking the rise time.   Can you add histograms, averages, RMS.... to the measurements?    Currently you can only display 8 measurements.  You may need to make use of the upper right area of the display.   

Can histograms be added for math waveforms?

What is the limiting factor in the 200 mVPP trigger limit?  I assume you require a minimum of that value.    Consider that a resistive probe may be 20:1.  Even old TTL would not meet that level.   Maybe I am not understanding the spec.   
SJL-Instruments:

--- Quote from: joeqsmith on February 04, 2024, 01:59:41 am ---Maybe consider pressing the Min/Max Hold once they have been enabled, resets or erases the waveforms rather than adding more of them.   How many min max waveforms for channel 1 does one need?   :-DD 

--- End quote ---
We'll remove the button if both a minhold and maxhold for the channel are present. The user can modify the math expressions in the added channels, so we'd re-enable the button if one (or both) expressions are altered.


--- Quote from: joeqsmith on February 04, 2024, 01:59:41 am ---3.4.4 FFT does not mention the THD feature.   The software shows invalid.  Is it implemented and not documented, or just a place holder?

--- End quote ---
The THD will display as invalid if there isn't enough resolution to get an accurate measurement. You should have five full periods (ideally 10) to get a meaningful result. We'll clarify this in the manual.


--- Quote from: joeqsmith on February 04, 2024, 01:59:41 am ---One person had asked about tracking the rise time.   Can you add histograms, averages, RMS.... to the measurements?    Currently you can only display 8 measurements.  You may need to make use of the upper right area of the display.

--- End quote ---
It's easy enough to allow multiple rows of measurements at the bottom. Our first thought is to have a window open when you click a measurement, which allows editing of the measurement, as well as displaying the histogram, trend, average, RMS, percentiles, etc.
We can add an option to pin some or all of this information to the upper right as well.
(By default, the upper right area is unused so that the software can be docked to one half of the screen without issue.)


--- Quote from: joeqsmith on February 04, 2024, 01:59:41 am ---Can histograms be added for math waveforms?

--- End quote ---
Yes - we can likely get this in by tomorrow's release.


--- Quote from: joeqsmith on February 04, 2024, 01:59:41 am ---What is the limiting factor in the 200 mVPP trigger limit?  I assume you require a minimum of that value.    Consider that a resistive probe may be 20:1.  Even old TTL would not meet that level.   Maybe I am not understanding the spec.   

--- End quote ---
The trigger will work below 200 mVpp, but at a reduced bandwidth. At low amplitudes, you might need to bump the trigger level up or down by a few mV to get a stable trigger. The limit stated in the manual is a conservative guideline.
joeqsmith:
Indeed, at 5.8GHz the required level is different than 1GHz.  Is the sensitivity vs frequency defined somewhere?   I assume that we can bias that 200mV anywhere as long as we stay within the common mode range (+/-950mV). 
   
0.2 X 20 (probe attenuation) or 4V swing which is CMOS.  Even if you work reliably at 100mvp-p, or a 2V swing, that rules out most logic?  Are you expecting it to work with say LVDS and a 20X resistive probe?    The manual doesn't  offer any suggestions or guidelines when it comes to probing.   


--- Quote ---The THD will display as invalid if there isn't enough resolution to get an accurate measurement. You should have five full periods (ideally 10) to get a meaningful result. We'll clarify this in the manual.
--- End quote ---
Is the THD in your software calculated differently than the calibration certification?  If the settings are critical as far as replicating what you call out, you may want to define them.   
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod