Newport 8000 - Remote Operation I; PD Current Calibration

Chapter 6 Calibration 75
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 corresponds to the
module to be calibrated.
c. Press the
Setup
soft key, change the
Mode
to
Im
(Photodiode constant
current mode), and set the laser current limit (
Io Lim
) to maximum.
Press the
Prev
soft key to return to the single display.
d.
Press the
OFF
soft key to turn the laser output on. If a laser on delay
has been set, wait that amount of time to allow the laser output to
engage.
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
Im
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.
6.2.6 Remote Operation I
PD
Current Calibration
a. With the laser output off, connect a calibrated ammeter to the
photodiode anode output of the module and connect the circuit of
Figure 30 to the laser and photodiode outputs.
If a calibrated ammeter (with 0.1 µA resolution) is not available, place a
calibrated DMM (with 0.1 mV resolution) to measure the voltage
across the resistor, R3, as shown in Figure 30. 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. Select the channel [,subchannel] via the
LAS:CHAN
command. Set the
laser current limit to full scale via the
LAS:LIM:LDI
command. Set
the photodiode current set point to ½ full scale via the
LAS:MDI
command. Place the unit into constant photodiode current mode via the
LAS:MODE:MDI
command.
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