Power and/or Wavelength Measurement
112
OMM-6810B
The HOLD light indicates that the light input to the optical measurement head is
varying by greater than 1 nm between measurements. In this condition, the
HOLD indicator blinks slowly and the 6810B holds the last stable measurement on
the display and uses that wavelength to calculate power. The wavelength is held
until a stable wavelength is measured.
The DISPLAY
Δ
button is used to set a reference
wavelength and begin displaying the change in wavelength
from that reference. Pressing DISPLAY
Δ
again returns the
display to absolute wavelength measurements.
Pressing the DISPLAY VIEW REF button displays the power
and wavelength reference points on the appropriate
display(s).
The DISPLAY BRIGHT button is used to adjust the intensity
of the front panel display. Pressing this button cycles the
brightness through five steps ranging from brightest to dark.
The DISPLAY ZOOM button controls the sensitivity of the
bargraph display. In ZOOM mode, the ends of the bargraph
blink and the sensitivity is increased by ten.
The DISPLAY RATE button controls the speed at which
measurements are taken. The possible rates are SLOW (16
samples @ 60m/S/S), MEDIUM (4 samples @ 60mS/S) and
FAST (1 sample @ 60 mS/S).
It is possible to calibrate the OMM-6810B with any optical
measurement head using a laser source of known
wavelength and/or power. Pressing the CAL USER button
toggles the instrument in and out of the User Calibration
mode. When the LED above the CAL USER button is lit, the
unit employs the user defined calibration which has been
stored in the Optical Measurement Head. Pressing the CAL
USER button when the CAL USER LED is lit causes the
instrument to revert to factory calibration. Pressing the CAL
SET button while the LED above the CAL USER button is lit
initiates a user calibration procedure.
