Does anyone have a valid reason to upgrade to 16MHz?
This question is asked very often by people who do not read the global author’s manual from Karl-Heinz at all, or who simply skim through it without delving into the technical nuances and thoughts that the author, with his enormous work and effort, wanted to convey to you.
If you open the manual dated November 15, 2021 on page 50, you will find this:
"WITH SamplingADC With this option set, the tester make use of the sampling method of ADC
in special cases. By shifting the sampling time of the ADC with increments of 1, 4 or 16
processor clock intervals for repeatable signals fast changes of voltages can be monitored. The
load time of little capacitors below 100pF can be monitored with a resulting resolution of
0.01pF with a
16MHz processor clock."
The increased clock frequency also makes it possible to test various resonators (ceramic and quartz) in k-firmware, and in m-firmware it also allows you to expand the frequency ranges in the generator and frequency meter functions.
You can set the quartz to a frequency of 20MHz, but not all AVR controllers (especially Chinese ones) work stably at this clock frequency.