78 Chapter 7 Calibration
d. Enter the
LAS:CAL:MDI
command to place the 6000 in its laser
photodiode current calibration mode.
e. After a few seconds, the 6000 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 6000 is ready to receive it.
The 6000 will be ready to receive the current value when, after a
LAS:CAL:MDI?
query is sent, the response from the 6000 is "1".
f. Once the actual photodiode current value is entered via the
LAS:MDI
command, the 6000 will apply a new photodiode 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:MDI?
query is sent, the response from the 6000 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 6000 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 6000, the 6000 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.
7.2.7 Local Operation Laser Voltage Measurement Calibration
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.
c. Press the
Setup
soft key and set the laser current limit (
Io Lim
) to 80%
of the maximum current plus 100 mA and the laser voltage compliance
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