Hardware Space Components
The X (1) dropdown box allows the X scan signal from the Scan Processor to be Summed, Inverted, or
be Disconnected from the HVA. Inverted means that the X scan signal will be turned into a –X scan signal
before it is added to the HVA.
The Y (2) dropdown box allows the Y scan signal from the Scan Processor to be Summed, Inverted, or
be Disconnected from the HVA.
The Z (3) dropdown box allows the Z scan signal from the Scan Processor to be Summed, Inverted, or
be Disconnected from the HVA.
The External Modulation (4) dropdown box allows any signal connected to the rear panel BNC on the
Piezo Interface Board labeled Input A to be Summed, Inverted, or be Disconnected from the HVA.
Note
The unused inputs should be disabled to prevent accidental use. The External Modulation
should also be disabled if not used to prevent noise picked up on the Input A BNC from
summing into the HVA output.
The R9 Control (5) dropdown box allows the R9 Control (A) to be Summed, Inverted, or be
Disconnected from the HVA. This R9 Control can be a control on the Dashboard allowing a voltage to
be directly entered to be amplified and output on the HVA. This is how a Z offset control would be
constructed. The R9 Control can also be accessed through a Procedure in Procedure Space.
Note
The R9 Control of the HVA will take the physical units of the hardware item connected to
the output of the HVA. This way the output can have a real physical meaning. If there is
nothing connected to the output of a HVA, its R9 Control will be displayed in volts.
The Limit Maximum (6), HV Gain (7), and Output Type (8) set the operating range of the HVA. This
limit circuitry is after all of the inputs have been summed, so the HVA output will not exceed the limits,
regardless of the value of the inputs. These limits are generally used to protect output components from
being damaged from the application of too high of a voltage. The HV Gain of the R9 controller is fixed
and would not change. Typical values for the HV Gain are 1, 15, and 21.5. The absolute maximum
voltage output of a HVA is the HV Gain * 10. For example, a controller with a HV Gain of 15 would have
a maximum output voltage of ±150 V. For the case where a reduced voltage range is desired the Limit
Maximum and Output Type can be modified. If the HVA output should be reduced to ±100 V, the Limit
Maximum should be set to 100 V. For the case where only a positive output voltage is required, the
Output Type should be set to Unipolar. Otherwise, the Output Type should be Bipolar. A few examples
of the X Scan Signal with the Scan Area maximized using different output settings are shown in the figure
below.
Figure B.31. High Voltage X Scan Signal Output Examples
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