I need to make measurements with acquisition time of 1000 samples per second. I'm using the block mode. The measurements made show a lot of noise when using voltages in millivolts
What timebase index are you using to set the sampling interval? Have you referred to the Programmer's Guide for guidance on how to select the timebase index?
What voltage range are you setting on the channel?
The measures must be realized in the time of 500 milliseconds. The number of measures must be equal to 500.
All channels feature noise.
A test of measure realized with a battery of 9 V too presented the noise
What you mean when refers to the PicoScope 6?
The index of 20000 don't generates 999us. According page 17 of programmer's guide, the index 20000 generates 250us.
The application of the PicoScope in this project is necessary voltages the measure of 400 V in the channel A and 100 mV in the channel B (or other) of dinamic form .
You don't select high or low, it is set by the value of n as listed in the table. You will be using high for the timebase you mention, hence a time interval of 999.95 usecs
Are you using a laptop connected to the mains ? Try running on batteries.
Are there other possible sources of noise nearby ? Try moving the scope and cables.