User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany Page 87 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email info@pi.ws, www.pi.ws
Scaling the Analog Input
Before the analog input line can be used with an external sensor or with a control-signal source,
the input levels must be associated with suitable position values. To do this, adjust the OFFSET
(parameter ID 0x02000200) and the GAIN (parameter ID 0x02000300) of the Mechanics
linearization polynomial according to the travel range of the axis and the input signal range. See
below for details. The TSP? command reports the analog input values after the scaling as position
values in µm.
In addition, the digital filter parameters can be adjusted. See "Digital processing" (p. 27) for details.
How to adjust OFFSET and GAIN to map the analog input voltage to a suitably scaled position value
for a certain axis:
Figure 29: Processing of an analog input signal, detail from the overview figure above
Input Voltage:
The range is -10 to +10 V or -5 to +5V, depending on the value of the Sensor Range Factor
parameter (ID 0x02000100).
Normalized Value:
The polynomial used for electronics linearization (see "Digital processing" for details) converts the
analog input voltage to a number in the range of -100 to +100. The minimum input voltage value
corresponds to -100, and the maximum input voltage corresponds to +100 respectively. If, for
example, an input range of -10 to +10 V is selected, then -10 V correspond to -100, and +10 V
correspond to +100.
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