XPS-DRVP1
17
EDH0259En1010 – 08/10
8.0
Description/Use of « BNC » output
Note
: This output can be used only if the driver board controls a piezoelectric stage equipped
with a position sensor.
The XPS-DRVP1 driver board features a « BNC » connector that provides an analog
voltage image of the stage current position.
Output voltage ranges from 0 to 9V with:
-
~5V: when the stage is at its origin
(corresponding to the sensor R
0
value).
-
~0V: when the stage is at its lower limit (not
energized and maximum axial load)
-
~10V: when the stage is at its upper limit
(energized at its maximum voltage and without
axial load)
This output can be monitored by an oscilloscope or
a multi-meter.
Accuracy of this output voltage is directly related to
position sensor quality.
Figure 8 : BNC output during displacement
Notes
: « BNC » output voltage does not depend on
Offset
nor
Linearity
parameter values
« BNC » output voltage varies from one stage to another. A calibration of this voltage
output can be done. To do so, proceed as follows:
-
Memorize output voltage values (V
MAX
et V
MIN
) for stages maximal and minimal
positions (P
MAX
et P
MIN
)
-
Calculate resolution: (V
MAX
- V
MIN
) / (P
MAX
- P
MIN
) en V/µm
WARNING
In case of a stage placed in “disable” mode and without any axial
load, if BNC output value is lower than 4 Volts or higher then 6 Volts,
the stage has probably been damaged.
Contact Newport for service
Stage
physical
possible
range
Sensor
scale
R
MIN
R
max
R
0
BNC
Output
~5V
0V
10V
