Newport 8000 - Drive Current Load Resistor Selection; Local Operation Current Source (Io) Calibration; Table 10 - Drive Current Load Resistor Selection

72 Chapter 6 Calibration
6.2.2 Drive Current Load Resistor Selection
Laser Drive Current Resistor
200 mA
30 Ω, 2 W
500 mA
10 Ω, 5 W
1,000 mA
5 Ω, 10 W
3,000 mA
2 Ω, 25 W
6,000 mA
1 Ω, 50 W
Table 10 - Drive Current Load Resistor Selection
6.2.3 Local Operation Current Source (
I
o
) Calibration
a. With the output off, connect a load resistor, as selected Table 10, and a
calibrated ammeter in series across the laser output terminals. If an
ammeter with the appropriate current ratings is unavailable, connect a
calibrated DMM across the laser output terminals to measure the
voltage across the resistor. Calculate the current in the following steps
by using Ohm's Law:
I = V / R
where V is the measured voltage across the resistor, and R is the
measured load resistance.
b. Go to the single module display by first pressing the
MENU
button,
then the
Modules
soft key, then the soft key(s) that correspond to the
module to be calibrated.
c. Press the
Setup
soft key and set the laser current limit (
Io Lim
) to one-
half scale plus 100 mA and output bandwidth as desired. Press the
Prev
soft key to return to the single display.
d.
Press the
OFF
soft key to turn the laser output on, if it is not on already
e.
Go to the Calibration Screen. This is done by pressing the
Menu
button,
Config
soft key,
Calibrate
soft key; then the soft key(s) that
correspond to the module to be calibrated.
f. Press the the
Io
soft key. Follow the on-screen instructions to complete
the calibration. The calibration can be canceled without affecting the
stored constants if the
Cancel
soft key is pressed at any point prior to
completing the calibration.
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