Hardware Space Components
Tip
Some piezo elements are damaged if they are reverse polarized, so the Output Type
should be set to Unipolar, preventing the output from going negative.
Important
This HV Gain parameter is only changed if the actual hardware gain of the HVA is
changed, which would require changing components on the circuit board.
Warning
The High Voltage Amplifier boards should not be modified by a user as it would void the
warranty of the circuit board. Please contact RHK Support if the hardware gains need to be
modified.
The Kelvin PI Input (9) dropdown box allows the output signal from the Kelvin PI Feedback Controller
to be Summed, Inverted, or be Disconnected from the HVA. An example application of the Kelvin PI
Input is for interferometer feedback.
The Internal Piezo Modulation Sine Input (10) and Internal Piezo Modulation Cosine Input (11)
allows the Sine Output or Cosine Output of the Internal Piezo Modulation signal to be Summed,
Inverted, or Disconnected from the HVA. This can be a very useful tool for diagnosing problems with a
scan head as each piezo segment can be individually modulated while monitoring the input signals.
Note
Any number of the inputs on the amplifier can be summed simultaneously. Enabling both
the X Scan and Z Scan inputs is the method used to sum the XY Scan Signals with the Z
signal as is done on some RHK microscope designs. The inputs are all digitally summed
together, eliminating the noise caused by using analog summing junctions. The summing
circuitry prevents the DAC from rolling over if all of the inputs add up to exceed 10 V. No
damage is caused if these inputs saturate the input of the DAC.
To Next Page
Loading...