-
Ray, The ADCs that are linked to the front panel have a fixed input range of ~+/-12V. These ADCs give true 16 bit resolution -- so, every LSB accounts for ~0.4 mV. If you need better resolution, I would recommend gaining up your signal before the front panel BNCs. Hope this helps, Fritz
-
Stefan, The best way to drive Z would be to drive the Z Piezo directly. This would, of course, require High Voltage (+/- 220V). This method would give you ultimate Z-feedback control. You could accomplish this by piping the "In-0" Deflection signal to your FPGA Control system, then do your compensation (PID, Hinf, H2, etc) and output the control
-
This is easy to do with a NanoScope V. Here is a quick recipe: 1) Engage on the surface in contact mode. 2) Use the Generic Lockin feature and set Lock-In 1 to drive Z and Vertical as the input (see attached image) 3) Sweep You should see the main resonance around ~12 kHz. Hope this helps, Fritz
-
Andres, It sounds like you're scanning a rough sample. The ScanAsyst algorithm detects this and will lower the scan rate automatically to minimize force error. The lower limit of the algorithm is 0.1 Hz, so it seems that it has saturated. You might try reducing your scan area and see what it allows... You should definitely use ScanAsyst Air probes
-