Details on an IHL File's Constructions
I.7. Channel 1 Drive
The Channel 1 Drive is used for the STM’s bias voltage. Channel 1 Drive has both a BNC output and a
differential output on the preamp connector. The BNC output has a voltage range of ±1 V when 50 Ω
terminated and a bandwidth of more than 10 MHz. This output is used for high frequency AFM
applications. When used for STM applications, the differential output on the preamp connector is used.
The preamp cable supplied connects between the R9’s preamp connector and the IVP-R9 Bias-Preamp
Interface Module. The bias voltage output range on the IVP-R9 has a range of ±10 V and a bandwidth of
50 kHz.
I.8. Bias Setting
The Bias Setting icon is a module that is used to allow an STM to be switched between positive and
negative bias voltages without causing the tip to crash. The Output pin of the Bias Setting icon is
connected to the Value pin of Channel 1 Drive. This connection will disable the Value setting of Channel
1 Drive and only allow a Bias Voltage to be entered in the Bias Setting panel.
Only a positive number can be entered into the Bias Setting panel while the bias polarity is positive.
When a positive number is entered, the module automatically sets the correct polarities for the Setpoint
and Proportional and Integral parameters of the Z Feedback Loop . When a negative bias voltage is
desired, the Minus symbol in the Bias Setting panel is pushed. This action calls up a procedure called
BIAS that safely switches the polarity of the Bias voltage and the Setpoint, Proportional, and Integral
parameters of the Z Feedback Loop. Pressing the Plus symbol in the Bias Setting panel will revert the
system safely back to a positive bias voltage. The procedure that is run differs slightly depending if the
feedback loop was set to the Linear, Logarithmic, or Divide mode.
I.9. Z Offset
The UHV300 STM has a separate Z offset signal that is applied to the inside of the three outer legs of the
microscope. A separate High Voltage Amplifier is shown connected to this piezo element. The Value
parameter of the HVA will be exposed on the Dashboard to allow the manual setting for the Z Offset
value. This Z offset HVA could have also been included in the HVA block along with the amplifiers that
drive the four scanning piezo elements. IHDL™ is a very powerful and flexible system that allows great
flexibility in implementing a user's concepts and ideas.
I.10. PPC200
The PPC200 is an external interface module that controls the approach of RHK’s Beetle microscopes.
Adding the PPC200 icon on the Hardware space enables the R9 Software to interact with the PPC200.
No wiring connections to the PPC200 are required in Hardware Space.
Note
Only Beetle microscopes will use the PPC200. Other microscopes may need different types
of interface modules, such as the PMC100 that is used with RHK’s PAN-style of
microscopes.
I.11. Measure Items
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