Digital filtering with the 3000 series?

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Digital filtering with the 3000 series?

Post by Guest » Thu Jun 14, 2007 1:12 pm

Hi at Pico

I found the below-pasted answer to an older but similar post.

Old post - start -
The unit doesn't provide analogue filtering, but there is a certain degree of digital filtering, you can apply this from Setting | Options, change the Display Mode to: Current (filtered).

The filtering factor cannot be directly modified, it is a product of the screen resoution and the amount of data collected (controled by "Max Sample per scope trace" in Settings | Options).
Old post -end -

Using the display mode "current (filtered)" and changing the product of the screen resolution and the "max sample per scope trace" almost reduces the noise sufficiently. However, I still need some more filtering. For example what corresponds to an analoque 4th order filtering with a signal-delay of max 1 ms and a cut-off of say 30 Hz. I need to visualize a horizontal tracing of a strain-gauge output on the scope that is without noise. I´m sampling the signal with another pc (the input signal to the Picoscope is "divided"), so for that signal I can subsequently use a digital filtering of the signal using standard EMG-processing software. In this way, the pico-pc is only used for visualization-purposes. I really hope you guys can help me out as the PicoScope has all the other options that I have been looking for.

With kind regards


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Post by PeterF » Fri Jun 29, 2007 8:08 am

Hi Thomas,

I'm afraid we can't offer any more suitable filtering above that which you are using at the moment. Most of our effort goes into getting a faster response! It should be easy for you to add an external fourth order filter in hardware, maybe built into your signal splitter box? Is that not an option?

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