1. The ADC Setup
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The factory setting results, in a resonance problem at higher frequencies. The HF-setting
deactivates some filters in the readout logic of the FPGA. This should make you able
to measure frequencies up to 150 MHz and more.

I always use the HF-Setting because it has the best results on my two
DSOs.

A few Users had some problems with spikes, so there are some other test
settings to find out which one matches best to Your device.





2. Pre Gain Setting
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The Pre Gain menu allows you to override the Factory setting of gain 1
at the 1er and 2er ranges with the gain 1.25 - this may have a positive
effect to the noise level.

The other settings are for hardware modifications in the preamp stage on
the mainbord. Some users exchanged the line resistors (0 Ohm) at the
preamp input against 33 Ohm. Due to that You can choose other scaling
factors in this menu which fit to those modifications.

As to read in the hardware thread 

http://www.mikrocontroller.net/topic/1661333#postform

there is planned a little preamp board as a new input stage. For this
modification I added the Add On entry.



Regards Hayo