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MXH Multiplier Option Manual
1.3.
Multiplier Board Setup
The MXH Multiplier is designed to work with perfectly sinusoidal signals with no DC
bias (offset). The actual magnitude of the sine and cosine signals is not as important as the
value of one signal relative to the other. The MXH multiplier is a "ratio-metric" device,
which means that the sine and cosine signals should be adjusted for equal peak
amplitudes. Any gain- imbalance between the sine and cosine signals will result in cyclic -
interpolation errors in the MXH output.
Any DC bias (offset) in sine or cosine will also cause cyclic interpolation errors in the
multiplied output.
The gain and DC bias can be adjusted for each signal on the MXH multiplier circuit
board.
1.3.1. Oscilloscope
Generally, systems operating at less than optimum performance due to interpolation errors
will exhibit the following symptoms:
1.
A constant whining noise can be heard when running at low speeds.
2.
At high speeds, a chirping noise can be heard when the table is accelerating and
decelerating.
3.
Using Aerotech's application software as a diagnostic tool, a harmonic or a sub-
harmonic of the fundamental encoder frequency may be seen in the position
error or velocity error plots of the axis scope window.
1.3.2. Equipment/Tools Required
1.
A two-channel oscilloscope capable of being isolated from ground and
displaying a Lissajou pattern (X, Y) of the sine and cosine encoder signals
2.
Small slotted tip screwdriver or adjustment tool.
The amplified signals can not exceed 4V peak-to-peak or a loss of accuracy occurs.
Version 1.6
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Description and Configuration
Aerotech, Inc.
1-3
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