Chapter 7 Calibration 55
a. With the laser output off, connect a calibrated ammeter to the
PD Anode output of the driver and connect the circuit of Figure
20 to the laser and PD outputs.
If a calibrated ammeter (with 0.1
µ
A 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 20. 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. With the unit in Im mode, press the
LDD ON
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.
c. Start the calibration procedure by first pressing the
MENU
button, then right arrow until the
Calibration
menu is reached,
then presses the down arrow until the
Im Calibration
function
is selected, then the right arrow key to execute the Im calibration
function.
d. The output will be set at ½ full scale and allowed to settle. Once
settled, enter the actual current measurement from the ammeter
display, then select the
Next
soft button and press the right
arrow.
e. The output will then be moved to ¼ the current set point and
allowed to settle. Once settled, enter the actual current
measurement from the ammeter display, then select the
Next
soft button and press the right arrow.
f. The calibration procedure is complete.
7.2.5 Remote Operation I
PD
Current Calibration
a. With the laser output off, connect a calibrated ammeter to the
photodiode anode output of the driver and connect the circuit of
Figure 20 to the laser and photodiode outputs.
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