viscoelastic measurements

Alan Tang posted on Fri, May 27 2011 7:51 AM

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Hello,

I want to do viscoelastic measurements with the Bioscope. We already did these measurements a long time ago.

So, I applied an external sinus signal (from the lock-in) to the piezo through the extension box. I used the relative trigger and introduce a ramp delay to applied the modulation when I am in contact with the surface.

The force curve doesn’t take account of the delay and thus shows a gap (delay) between the approach and the withdraw curves. Also, I don’t see a signal on the hard surface (amplitude of the sinus is 0.5V, from the lock-in).

I put force modulation on disabled, as I use an external signal. Is it ok?

Thanks,
Alan