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Chapter 7
7.2.4
Remote Operation Current Source Calibration
Calibration
a.
With the output off, connect a load resistor, as selected Table 10, and a
calibrated ammeter in series across the laser output terminals. If an
ammeter with the appropriate current ratings is unavailable, connect a
calibrated DMM across the laser output terminals to measure the
voltage across the resistor. 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 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 6000 will be ready to receive the current value when, after a
LAS:CAL:LDI? query is sent, the response from the 6000 is "1".
f.
Once the actual current value is entered via the LAS:LDI command,
the 6000 will apply a new current equal to approximately one-fourth (¼)
the previous set point.
The 6000 will be ready to receive the second current value when, after a
LAS:CAL:LDI? query is sent, the response from the 6000 is "1".
g.
Input the second actual (measured) laser output current as in Step e.
h.
Once the actual current value is entered via the second LAS:LDI
command, the 6000 leaves the current calibration mode.
If, at any time prior to the second LAS:LDI, a command other than
LAS:LDI or LAS:CAL:LDI? is sent to the 6000, the 6000 will cancel
I = V / R
75
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