EDH0170FE1010 – 09/98
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LDS1000 Controller for Laser Diode Sensors
7.3.3
Integration Constant
=>
(
F5
) =>
(
F3
)
The accuracy that can be obtained on a measurement depends on the num-
ber of readings carried out for that measurement.
In manual mode, the LDS1000 electronic controller carries out measu-
rements at a frequency of 2 kHz. Its own resolution at this frequency is 0.8
µrad when using a standard LDS-Vector autocollimator.
By calculating the average of a large number of measurements, it is pos-
sible to obtain a much higher resolution, to the detriment of the system’s
pass band.
The LDS1000 Controller carries out a sliding average of N successive
values, in relation to the INTG parameter that can be selected with this
menu (N = 2
x
INTG).
(
F2
)
Lowest INTG value.
(
F3
)
Highest INTG value.
(
F5
)
Return to main menu.
Possible values: INTG = 0,5; 1; 2; 5; 10; 20; 50; 100; 200; 500; 1000
Default value: INTG = 100
Unit: msec
7.3.4
Graphic Display
=>
(
F5
) =>
(
F4
) =>
(
F3
)
In order to facilitate alignments, a display in the form of a Bar-Graph is
recommended. For each axis, the number 8 digit is considered as the opti-
cal center of the autocollimator. The angles measured successively light up
the adjacent digits (7 on each side), logarithmically for accurate alignment
mode. Positive space values light up the digits to the right. The alignment
around the center of the sensor is achieved by switching off as many digits
as possible.
In alignment mode, a
function (
F4
) enables measurements to be per-
formed in relation to the current position which becomes a reference point.
(
F5
)
Return to main menu.
7.3.5
Display Light Received
=>
(
F5
) =>
(
F4
) =>
(
F1
)
To check if the instrument is working properly, make sure that the rate of
light returned to the sensor is sufficient. This mode is especially useful for
setting up the instrument in complex assemblies, in order to avoid substan-
tial vignetting. The best results are obtained when a maximum amount of
light is received.
