Table of Contents
Advertisement
Chapter 6
6.2.6
Remote Operation I
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Calibration
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.
Current Calibration
PD
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:
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.
I = V / R
75
Advertisement
Table of Contents
