Chapter 7 Calibration 53
7.2.3 Remote Operation Current Source Calibration
a. Connect the shunt to the laser outputs. Connect a calibrated
DMM across the shunt’s terminals to measure the voltage.
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
current limit to one-half scale plus 100 mA via the
LAS:LIM:LDI
command, output bandwidth as desired via the
LAS:MODE:I
,
LAS:MODE:ICW
, or
LAS:MODE:ILBW
command, and current set point to one-half scale via the
LAS:LDI
command.
c. Enter the
LAS:OUTPUT ON
command to turn the laser output
on.
d. Enter the laser LDI calibration mode by issuing the
LAS:CAL:LDI
command.
e. Input the actual (measured) laser output current (as an <nrf
value>) via the
LAS:LDI <nrf value>
command.
The 5600 will be ready to receive the current value when, after a
LAS:CAL:LDI?
query is sent, the response from the 5600 is
"1".
f. Once the actual current value is entered via the
LAS:LDI
command, the 5600 will apply a new 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:LDI?
query is sent, the response from
the 5600 is "1".
g. Input the second actual (measured) laser output current as in
Step e.
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