Analog Output Configuration - Newport LDS1000 User Manual

LDS1000
EDH0170FE1010 – 09/98
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".
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
• Further measurement distortion
• Extra noise
• Maximum offset
• 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.
Controller for Laser Diode Sensors
NOTE
14
0.5 increment
0.5%
1 mV rms (measured with a
load of 1 MΩ).
50 mV typical.