C A L I B R A T I O N
Manual Operation User Calibration
20
OMH-6727B
C H A P T E R
4
Manual Operation User Calibration
Front Panel execution of the User Calibration using the OMM-6810B is described
in the procedure below:
•
Identify ambient conditions and zero the instrument as described in Chapter 2.
•
Launch a laser of known wavelength and power into the OMH-6727B.
•
Start the calibration by pressing the CAL
USER
button to place the unit in User Calibration
Mode. The LED above the CAL
USER
button will light. Press the CAL
SET
button to initiate
the User Calibration Procedure. The left display will show
"CAL-
λ
".
•
The measured wavelength is shown on the right display. Adjust the displayed wavelength to
match the laser's known wavelength using the WAVELENGTH
LEFT
and
RIGHT
buttons to
select a digit and then use the WAVELENGTH
UP
and
DOWN
arrow buttons to change the
wavelength.
•
Press the CAL
SET
button to complete the wavelength calibration.
•
The right display will now indicate
“CAL-P”
. The measured power will be shown on the left
display. Adjust the displayed power to match the laser’s known power using the POWER
UP
and
DOWN
arrow buttons. If large adjustments are necessary, hold down the
UP
or
DOWN
button to accelerate the change.
•
Press the CAL
SET
button to complete the calibration. The unit returns to real time
wavelength and power measurements.
Remote (GPIB) Operation User Calibration
Remote controlled User Calibration is described in the following procedure.
•
Identify ambient conditions. Block the laser beam from entering the aperture of the OMH-
6727B.
•
Start the calibration by clearing the status registers, then zeroing the instrument by issuing
the following GPIB commands:
*CLS
RANGE:AUTO ON
ZERO
•
Wait for the zero to finish. The controlling software can monitor the status of zeroing by
sending the following query in a loop. Exit the loop when the response is '1'.
ZERO?
•
Launch a laser of known wavelength and power into the aperture of the 6727B. Start the
calibration by sending the following commands.
CAL:USER ON
CAL:USER START
•
Enter the known wavelength using the command:
CAL:WAVESET xxxx.xx ss
