I'm just 'playing' with a new 2205MSO and I think I've found a bit of a problem using the Digital Channels.
Of course it may just be my understanding.
Set up is simple 555 timer about 740Hz as Clock driving two asynchronous 4 bit counters.
ChA x10 connected to Clock. D7-D0 to outputs of counters, organized as a single group.
Trigger: Single, Digital: Binary 0000000R, Pre Trig 50%
Number of Samples: 49.08 kS (Default)
At 1ms/div: OK (ChA shows number of cycles and Group counts exactly as expected FD FE FF 00 01 02 03 04)
At 100uS/div: Also OK (ChA has single rising edge Group 00 01)
At 50uS and 20uS: As above.
At 10uS: ChA still OK - but Group is completely incorrect (see attachment #1).
It appears as if the data buffer has 'random' data in the range -50.0 - -31.8uS the remainder of the buffer is all zeros's.
The clock edge on ChA is perfect.
Changing the trigger to Digital: Binary 0000011R etc does not change the results??
For all time/div from 5uS down to 50nS ChA reveals increasing slope to the rising edge (as expected) Group 1 remains at all zeros's.
If this is repeated, but the trigger is changed
Trigger: Single, ChA Rising 2V Simple (Thus it should trigger on any group value 1:256 chance)
Then the 20uS/Div again seems to limit the expected behaviour - at this and above group values are random, but always in sequence changing at the trigger point.
At 10uS/Div and below the above incorrect behaviour is repeated group value remains stubbornly at zero.
I've noticed that my version of Picoscope (via Help) is 126.96.36.199
I'm also running on Windows 8.1 x64
Help/Check for updates responds with 'There are currently no software updates available'
However, browsing the web-site reveals several updates since this version, many with anonymous 'bug fixes'...
So - should I try a particular version? If so which (obviously the latest is a prime candidate).
Can you just install the new version on top of the old or is it best to remove the old installation first?