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Just a quick question - I'm using a Multimode on a NSIIIa controller with a basic extender. In older versions of the NS software there was an option to attenuate the cantilever drive signal by a factor of 8 (in the Microscope>Calibrate>Detector menu). This was useful for eliminating drive noise in tapping mode when cantilevers required very small drive amplitudes to reach the desired free amplitude.
In NS 531r1, this option doesn't seem to be available - does anybody know if it has been hidden elsewhere in the software, or if it has simply been removed in this version?
According to the manual, the jumper settings in the Multimode base and the switch configuration on the extender are set as required.
Any info much appreciated.
Thanks,
Nic
Hi Nic
There used to be a 1X-8X attenuation feature in early versions. What it actually did was attenuate the gain of the photo-detector signal by a factor of 8. The feature still exists but the name changed to Amplitude Limit (or Deflection Limit in contact mode). It is located in the window labeled Other Controls and toggles back and forth between 2.5V and 20 V, which is the factor of 8 you were looking for. With a basic extender, you need to make sure that the Tip or Sample Voltage switch is not set to Analog 2, and that the microscope is not configured to use Analog 2 as a user defined voltage. Analog 2 is used to control the attenuation and if it is used for something else, attenuation will not be available.
Best
Stefan
Hi Stefan,
thanks for your reply.
I thought that there was a software option to attenuate the tapping drive signal, but must have been mistaken.
Best wishes,