Just to make it Clear to all;
Zooming has no effect if there are Decoding errors. The decoding is done on the full un-Zoomed data.
Below I show 3 displays where the errors still exists. Note you can see the error gaps
Also Note that if there are errors in non- Record mode there will be errors in the recorded frame ( same recorded points are used, Not the display data)
I find it quite interesting that, in spite of your hypothesis that whenever the samples/bitCell is <28, it fails, in fact it is still working, most of the time (82%). And look at the pattern... 2 correct, 1 skipped, 3 correct, 1 skipped. Repeat. This suggests that it's phasing in and out, or something similar. The ones it missed didn't have any fewer samples/bit than the ones it handled properly!
Is anyone else seeing a screen flicker in their ds2072a? It is especially noticeable on grays, and is probably caused by backlight leds. I would estimate the frequency at 40-60 hz. I searched here and on Google and surprisingly didn't find any posts mention this. Did I get a bad unit, or are you all less picky than I am? The scope is not modified in any way.
I find it quite interesting that, in spite of your hypothesis that whenever the samples/bitCell is <28,...I was wrong
I did more tests and I think I can show the limit for samples per bit for good decoding
...
My Conclusion, The requirement for good decoding is 4 samples per Bit (RS232)
Think about what '4 Sample points/Data Bit' implies for acquiring comms-type data in segments, in RecordMode! Properly adjusted, the duration and size can be quite amazing. At just 4 samples/bit, that's 7x(!) as long as you originally thought possible.
so i tested version FW 00.03 but still the noise is there.
Test signal is 100 Mhz 0 dB, on other scoop it is a steady clean signal. ( also on FW 00.01.01, or on one channel ) )
so i tested version FW 00.03 but still the noise is there.
Test signal is 100 Mhz 0 dB, on other scoop it is a steady clean signal. ( also on FW 00.01.01, or on one channel ) )
i did a test on a DS1000z where you can turn off and on Sin(x)/x
that makes a lot...lot off difference. ( temp a DS1000z for test ).
But why was it then on FW version 01 of the DS2000 better, what did they change..?
i did a test on a DS1000z where you can turn off and on Sin(x)/x
that makes a lot...lot off difference. ( temp a DS1000z for test ).
Implementation of FFT, differenses between DS2000 and DS1000z, most
things works the same on these two DSO.
But on the DS1000z the FFT is more user friendly, even better as on the DS2000@Wim
Good to see Wim, I hope those features will go into the DS2000 Firmware someday
On the DS1000;
Can you please check what happens when you push the Multifunction knob when selecting the FFT vertical offset & Vertical Scale,
On the DS2000 with Vrms , pushing knob set 0 Vrms to the middle of the scale , Useless
What is a negative Volt on an FFT display???
Thanks
With more and more people stating and receiving the New FW 00.03.00.00, I thinking it would good to report new Bugs here. Marmad has kept a good list on the 3rd post of this Blog. Altough Marmad usually confirms all bugs himself , I think it would be helpful for a few others to confirm any reports. Also if any Fixs to an existing bug is a complete fixed.
These are Bugs I have found:
#03__01 The Clear Button does not work.
#03__02 The decode display does not clear when decode is turned off
#03__03 Once the lg(CH1) advance Math function is applied you can Edit the function;
If the Expression button is press the DSO hangs. and if in start Last System. the
attempt to change the expression , will hang the DSO!!!
#03__04 The Set Counter Menu has display Error (unnecessary scrolling,small ) see Pics
This occurs when system 'System'-'Power On' - is set to 'Last' and the trigger is
NOT set to EDGE trigger.
Power cycle after PULSE trigger causes 3 items in Menu ,most others 2 items set in Menu
Auto Setup Button resets trigger to Edge and all 4 Menu Items??? (CH1,Ch2,Ext,Off)
If anyone ventures onto Fw 00.03.00.00, please help to confirm any of these.
Edit 1 Added more info on Bug #03__04
I have not found anything from the manufacturer that denotes the improvements found in the .03 version. I may have missed the valid reasons for doing so, and it would be nice if someone could point those features/improvements out to a newbie like me!
So, should I install 00.03.00.00? Thanks in advance for any responses.
Rick