ILX Lightwave OMM-6810B, Руководство пользователя, Страница: 123 / 126

Power and/or Wavelength Measurement
01_10 OMM-6810B
111

In manual wavelength mode, it is important to porgram the
6810B with the wavelength of the laser under test. Use the
WAVELENGTH LEFT and RIGHT arrow buttons to select the
digit on the wavelength display that will be changed. Then
use the WAVELENGTH UP and DOWN arrow buttons to
increment or decrement the selected digit. If no buttons are
pressed in three seconds, the displayed wavelength is set
and the digit will stop flashing.
It is possible to store four commonly used wavelengths in
the 6810B. Refer to Chapter 2 for more details..
It is important to zero the 6810B before taking
measurements. This is especially true for low input power
applications or in cases of high embient ligh intensity. When
measuring low power levels, avoid letting background
radiation into the measurement head. The zeroing
procedure is briefly described below:
Turn the laser source off or block the laser (at the source)
under test from entering the measurement head
. Press the
DISPLAY ZERO button. The ‘0’ digits walks across both
displays and the zero indicator flashes to inform the user
that the instrument is busy. When finished, the indicator
above the zero button is lit. Allow the laser beam to enter the
head or strike the probe and proceed with measurements.
The DISPLAY LOG/LIN button toggles the optical power
display between linear units and logarithmic units.
The DISPLAY nm/cm
-1
button toggles the wavelength
display between nanometers (nm) and wavenumbers (cm
-1
).
The DISPLAY

P button is used to set a reference power
and begin displaying the change in power from that
reference. Pressing the DISPLAY

P again returns the
display to absolute power measurements.