Details on an IHL File's Constructions
Measure Items are connected to signal channels to configure R9 to send that data to the Control PC.
Any number of the 40 possible signal channels can be simultaneously connected. All channels are
sampled at the same rate. By default, the data rate on each data channel is set to 10 kHz. As the number
of channels increases, the data pipeline between the R9 and the PC can start to get full, so the data rate
may need to be decreased as the number of channels increases. The data rate can be increased to 30
kHz.
The Measure Item has a dropdown box that is used to determine when the connected channel's data is
available in R9’s various data viewing tools. If Image is selected, the connected channel will be available
for display in the 2D viewers as well as in the oscilloscope and spectrum analyzer windows. However, this
data channel will not be available in spectroscopic windows. This would be the typical setting for the
topography channel as it is used in all topographic measurements, but is rarely measured during
spectroscopic measurements as it is a fixed value during I/V measurements. Other choices are
Spectroscopy which will only display the connected data channel in spectroscopy measurements, and
Image + Spectroscopy which will display the connected data channel in both the 2D and spectroscopy
displays. The final choice is None, where the data will only be available on the Monitors, Oscilloscope,
and Spectrum Analyzer.
Important
In addition to a signal source, such as the Current or Topography channels, a Measure
Item must also be connected to the Scan Area Window and the Ramp Spectroscopy
Settings.
I.12. Scan Area Window
Each Measure Item’s Scan Settings input pin must be connected to the Scan Area Window’s Scan
Settings output pin. This connection synchronizes the position of the probe during scanning to the
incoming time-based data stream.
I.13. Ramp Spectroscopy Settings
Each Measure Item’s Spec Setting input pin must be connected to the Ramp Spectroscopy Settings
Spec Setting output pin. This connection allows the data entered in the Ramp Spectroscopy Settings
window on the Dashboard to be made available to the spectroscopy procedures during spectroscopic
measurements.
I.14. Hardware Watchers
The Hardware Watcher allows the R9 controller to monitor many of the internal signals and anticipate
possible problems. One main use of the Hardware Watchers are in the PLL for Lockguard. Lockguard
can be enabled to protect the AFM Probe from crashes due to changes in the phase, either slow or fast,
during AFM operations.
Note
Enabling or Disabling Lockguard runs a procedure that will also abort any ongoing imaging
or spectroscopy procedure.
Figure I.4. Hardware Watcher in PLL
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