56 Chapter 7 Calibration
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. Select the channel 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.
c. Enter the
LAS:OUTPUT ON
command to turn the laser output
on.
d. Enter the
LAS:CAL:MDI
command to place the 5600 in its
laser photodiode current calibration mode.
e. After a few seconds, the 5600 will be ready for the actual
photodiode current to be entered via the
LAS:MDI
command.
The measured value of the current should not be entered until
the 5600 is ready to receive it.
The 5600 will be ready to receive the current value when, after a
LAS:CAL:MDI?
query is sent, the response from the 5600 is
"1".
f. Once the actual photodiode current value is entered via the
LAS:MDI
command, the 5600 will apply a new photodiode
current equal to approximately one-fourth (
¼
) the previous set
point.
The 5600 will be ready to receive the second current value
when, after a
LAS:CAL:MDI?
query is sent, the response from
the 5600 is "1".
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