Thank you for your post.
It is possible to get 15kSamples per second and thus you will ber able to see upto a bandwidth of 7.5kHz in the spectrum. In the scope viewer, to get good definition of a trace you need to take approximately 8 points per cycle. This means that you will be able to see 900 - 1000 Hz traces. However, if you do not casre about definition then higher frequency traces can be viewed as well.
ADC-42 can be used in both Picoscope and Picolog, the latter is the data acquisition software and has two modes 'Real Time Continuous' and 'Fast Block' mode. The first option allows you to collect up to a million samples before the a new file is required. The maximum sample interval in this modeis 1 per millisecond, to achieve this you would have to use the USB to Parallel port adapter.
The second mode will allow the unit to sample at the maximum sample rate, but is limited to a few milliseconds sampling duration.
The ADC-42 when connected to the Parallel port is clocked by the Windows clock for its timing. If another application is running on the PC then this can effect the timing of data sampling. However, this can be resolved by using the USB to Parallel port adapter which will then take over the clocking of the samples.