Table of Contents
Advertisement
Chapter 7
7.2.8
Remote Operation Laser Voltage Measurement Calibration
Calibration
limit (Vcomp) to 5.0 V, and output bandwidth as desired. Press the
soft key to return to the single display.
d.
Press the LDD ON key to turn the laser output on, if it is not on
already. If a laser on delay has been set, wait that amount of time to
allow the laser output to engage.
e.
Go to the calibration display by first pressing the MENU button, then
the Config soft key, then the Cal soft key, then the channel to be
calibrated. At the calibration screen, press the Vf soft key. Follow the
on-screen instructions to complete the calibration. The calibration can
be terminated without affecting the stored constants if the Term soft
key is pressed at any point prior to completing the 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 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 6560A 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 6000 will be ready to receive the value when, after a
LAS:CAL:LDV? query is sent, the response from the 6000 is "1".
f.
Once the actual voltage value is entered via the LAS:LDV 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 voltage value when, after
a LAS:CAL:LDV? query is sent, the response from the 6000 is "1".
g.
Input the second actual (measured) voltage as in Step e.
79
Advertisement
Table of Contents
