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76
Chapter 6
6.2.7
Local Operation Laser Voltage Measurement Calibration
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Calibration
c.
Enter the LAS:OUTPUT ON command to turn the laser output on.
d.
Enter the LAS:CAL:MDI command to place the 8000 in its laser
photodiode current calibration mode.
e.
After a few seconds, the 8000 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 8000 is ready to receive it.
The 8000 will be ready to receive the current value when, after a
LAS:CAL:MDI? query is sent, the response from the 8000 is "1".
f.
Once the actual photodiode current value is entered via the LAS:MDI
command, the 8000 will apply a new photodiode current equal to
approximately one-fourth (¼) the previous set point.
The 8000 will be ready to receive the second current value when, after a
LAS:CAL:MDI? query is sent, the response from the 8000 is "1".
g.
Input the second actual (measured) photodiode current as in Step e.
h.
Once the actual photodiode current value is entered via the second
LAS:MDI command, the 8000 leaves the current calibration mode.
If, at any time prior to the second LAS:MDI, a command other than
LAS:MDI or LAS:CAL:MDI? is sent to the 8000, the 8000 will
cancel the calibration mode and then process the command(s).
The *OPC? query may be used to determine when the calibration is
completed.
The operation complete flag (bit 0 of the Standard Event Status
Register) may be used to trigger an interrupt. This type of interrupt is
enabled by setting bit 0 of the Service Request Enable register and
using the *OPC command.
a.
With the output off, connect a calibrated voltmeter, in parallel with a
load resistor, as selected Table 10, to the laser output terminals.
b.
Go to the single module display by first pressing the MENU button,
then the Modules soft key, then the slot soft key that corresponds to the
module to be calibrated.
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