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 133 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email info@pi.ws, www.pi.ws
Tip/tilt platforms with differential drive require a fixed voltage (usually 100 V) at the third amplifier
channel. For further drive details, see the user manual of the tip/tilt platform.
There are two options for the E-727 to provide the fixed voltage:
Option 1: Offset voltage
The Voltage Offset of Amplifier parameter (ID 0x0b00000a) of output signal
channels 3 is set to the fixed voltage value.
Option 2: Third axis
In the E-727, a third axis is defined that is only used to provide the fixed voltage.
When you replace a tip/tilt platform with a new stage, you have to observe that the Voltage Offset
of Amplifier parameter (ID 0x0b00000a) is not stored in the ID-chip. Therefore, you have to check
the parameter value in the E-727 and adjust it manually, if necessary. Before you connect the new
stage to the E-727 for the first time, proceed as follows, (here, a terminal program is used):
1. Switch to command level 1 by sending CCL 1 advanced to have write access to the
Voltage Offset of Amplifier parameter.
2. Query the value of the Voltage Offset of Amplifier parameter for output signal channel 3 in
nonvolatile memory by sending SEP? 3 0x0b00000a
3. If necessary, set the value of the Voltage Offset of Amplifier parameter for output signal
channel 3 to a suitable value in nonvolatile memory:
If the new stage has a differential drive and option 1 (offset voltage) is to be used,
the offset parameter value must be set to the fixed voltage. Send, for example:
SEP 100 3 0x0b00000a 100
Furthermore, in the output matrix (p. 34), the matrix coefficients of output signal
channel 3 must be set to zero for all axes. If necessary, send for axes 1 to 3:
SEP 100 1 0x09000002 0
SEP 100 2 0x09000002 0
SEP 100 3 0x09000002 0
If the controller has a 4
th
axis, send also:
SEP 100 4 0x09000002 0
If the new stage has a differential drive and option 2 (“third axis”) is to be used, the
offset parameter value must be set to zero. Send:
SEP 100 3 0x0b00000a 0
The settings for the third axis will be loaded from the ID chip of the new stage.
If the new stage is no tip/tilt platform with differential drive, the offset parameter
value must be set to zero. Send:
SEP 100 3 0x0b00000a 0
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