THORLABS ITC4000 Series, Руководство по эксплуатации

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3 Operating the ITC4000 Series
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Attention
Input voltage / current must not exceed 10V / 20mA!
3.1.3.2 Connecting a voltage feedback source
An optical voltage sensor (like thermopile) can be connected to the 13W3 DSUB jack "LASER
OUTPUT" (R9) or to the BNC jack "OPT. SENSOR IN" (R4) at the rear panel (please refer to
section
Operating elements at the rear panel ). Sensor amplifiers or power meters with
voltage output can be connected here as well.
Attention
Prior to connecting an optical voltage sensor to the BNC jack "OPT. SENSOR IN", make sure
that the thermopile sensor input route is set to rear panel BNC (refer to
Setting the Thermopile
Parameters ).
The voltage sensor input parameters like input route, voltage range and response can be set
via
Setting the Thermopile Parameters .
We recommend using shielded “twisted pair“ wiring for the thermopile voltage measurement.
Attention
Input voltage must not exceed 10V!
3.1.4 Connecting the Laser Voltage Measurement
The ITC4000 controllers offer laser voltage measurements with standard accuracy or enhanced
accuracy. Without additional wiring, the laser voltage is measured at the "LASER OUTPUT"
jack (R9) at the rear panel of the unit (two terminal measurement). This leads to a measure-
ment error due to the voltage drop along the "current" lines to the laser diode, so a slightly in-
creased voltage will be displayed.
For an enhanced laser voltage measurement, two additional lines must be connected as close
as possible to the laser diode pins (four terminal measurement). Connect the laser diode anode
to pin 4 and the laser diode cathode to pin 10 of the "LASER OUTPUT" jack (R9) at the rear
panel of the unit.
Attention
If the laser voltage measurement contacts (pin 4 and pin 10 of the "LASER OUTPUT" jack) are
not used, they must be left unconnected to any other potential, otherwise the overvoltage pro-
tection may not work properly.
We recommend using separate shielded “twisted pair“ wiring for the Laser voltage measure-
ment to minimize noise in the current- or voltage feedback measurement.
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