Chapter 6 Calibration 77
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
limit (
Vcomp
) to 5.0 V, and output bandwidth as desired. Press the
Prev
soft key to return to the single display.
d.
Press the
OFF
soft key to turn the laser output on, if it is not on already.
e.
Go to the Calibration Screen. This is done by pressing the
Menu
button,
Config
soft key,
Calibrate
soft key; then the soft key(s) that
correspond to the module to be calibrated.
f. Press the
V
f
soft key. Follow the on-screen instructions to complete the
calibration. The calibration can be canceled without affecting the stored
constants if the
Cancel
soft key is pressed at any point prior to
completing the calibration.
6.2.8 Remote Operation Laser Voltage Measurement Calibration
a. With the output off, connect a calibrated voltmeter, in parallel a load
resistor, as selected Table 10, to the laser output terminals.
b. Select the channel [,suchannel] via the
LAS:CHAN
command. Set the
voltage limit to full scale via the
LAS:LIM:LDV
command, and the
current set point necessary to read approximately 80% of full scale
voltage. For example, with a 8560 module, with a resistance of 1 Ω, set
the current to 4,800 mA. Place the unit into constant current mode via
the
LAS:MODE:LDI
command.
c. Enter the
LAS:OUTPUT ON
command to turn the laser output on.
d. Enter the laser voltage calibration mode by issuing the
LAS:CAL:LDV
command.
e.
Input the actual (measured) laser voltage (as an <nrf value>) via the
LAS:LDV <nrf value>
command.
The 8000 will be ready to receive the value when, after a
LAS:CAL:LDV?
query is sent, the response from the 8000 is "1".
f. Once the actual voltage value is entered via the
LAS:LDV
command,
the 8000 will apply a new current equal to approximately one-fourth (¼)
the previous set point.
The 8000 will be ready to receive the second voltage value when, after
a
LAS:CAL:LDV?
query is sent, the response from the 8000 is "1".
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