Walter76

Hi Attila, thanks for the tip: I found the 820k resistor on CH2+ actually being 976k... Replaced it, AD2 fixed! Thank you! Walter

Hi Attila, thank you for the reply. The connection is very stupid: 1+ (orange) with W1 (yellow) and 2+ (blue) 1- (white-orange) with W1-GND (black) and 2- (white-blue). In the past it was working fine, just a few days ago I noticed this strange behavior... With the same connection, and setting W1 for 1kHz 1Vpp, I clearly see CH2 is lower than CH1, while they are the same at 100kHz. I cannot explain this behavior at HW level... What could be damaged this way? I only worked with max 5V signals, therefore I would exclude any AD2 abuse, unless sever ESD occurred (I have grounded mat and wrist...). BTW I noticed that if I simply swap the terminals of WaveGen1 (W1 to 1- and 2-, its GND to 1+ and 2+), the curves are as they should be... Verified with scope too. Walter

Hi all, I am facing a problem with a naïve NA sweep... W1 (or W2) and both scope inputs connected together via MTE (BNC adapter has same behavior). CH1 (stimulus) drops above 2MHz, but what is mostly annoying is CH2 with a -3dB attenuation from DC to about 1kHz. I would expect both curves being completely flat... Do I miss something? BTW, what means the yellow BW limitation alert on upper frequency? Finally, is there a calibration procedure to compensate for cables and parasitics? Thank you!

Hello, I am using DD to sniff and decode a custom SPI-like bus. The script works fine with 100 MHz x 32 and 200 MHz x 32 selection. After selecting 400 MHz x 16 or 800 MHz x 8, decoded data is no longer shown. Reverting back to lower speed has no effect: I have to reload the project... The standard SPI shows correct waveforms/values in all cases. Any suggestion? BTW, is there a way to show the HEX values in capital letters (0xFF instead of 0xff)? // value: value sample // flag: flag sample function Value2Text(flag,value) { var Trace = "0x"+value.toString(16); return Trace; } Value2Text(flag,value) Thank you a lot, Walter DD_Custom_SPI_decode.txt Custom_SPI_decode.dwf3logic