TTL outputs are not flat

Vanimiaou

Good morning,

I have a problem with the TTL outputs: they are not flat and take a long time to rise to a value that is neither 3.3V nor 5V. Do you know what can be the problem? Please find attached below the figures of different TTL channels

Thank you and have a great weekend,

The two TTL channels

The TTL channel is in blue

----Edit----

After digging in, I found that this is an already addressed issue: https://github.com/sinara-hw/DIO_SMA/issues/4#issuecomment-733306488

Can you suggest a way to fix this for us, I do not want to open your m-labs control system and make any electronic modifications on it as I risk to ruin it?

sb10q

There is no way around a hardware modification to fix this. But the modification should be simple - I believe the 10K resistors can be connected across the termination LEDs, where they can be easily soldered. If you want us to modify it for you, please email me at sb <at> m-labs.hk.