EDH0170FE1010 – 09/98
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LDS1000 Controller for Laser Diode Sensors
6.4 Analog Output Configuration
The analog outputs are only available by manual mode on the models
equipped with this option.
It is possible to modify the following parameters:
Refer to the chapter: “Off-line use”.
NOTE
The analog outputs deliver two voltages that are respectively proportio-
nal to the Y and Z measurements of the equipment.
Among other things this enables:
• Connection to an analog acquisition chain.
• Visualization of positions on an oscilloscope.
• Use of the sensor for analog controls.
These outputs are obtained by a digital/analog conversion of the values
calculated by the controller.
This conversion is carried out in real time at a frequency of 2000 Hz. It
imposes the following limits:
• Resolution limitation 0.5 increment
• Further measurement distortion 0.5%
• Extra noise 1 mV rms (measured with a
load of 1 M
Ω
).
• Maximum offset 50 mV typical.
• Discrepancy equivalent to a pure delay of 1.1 msec (without integration).
• Attenuation equivalent to the one of an order 1 low-pass filter with
600 Hz cutoff frequency.
The output voltages take into account the averaging defined by INTG. The
full scale voltage variation (±10 V) matches the full scale measurement
variation, i.e. a scale factor of 5 mV/increment.
A multiplying factor defined by GAIN (1 to 200) makes it possible to change
this scale factor from 5 to 1000 mV/increment. The gain comes with a limi-
tation of the angular range that can be visualized (outputs limited at ±10 V).
The impedance of the outputs if equal to 10
Ω
and the maximum current
they can deliver is 4 mA.
