Promax PROLITE-20, Instruction Manual

Page: 19 / 22

February 2001
INSTRUCTION MANUAL. PROLITE-20/21
Page 17
E
nglish
4.3.2 Measuring Relative Power
In this meter mode the instrument measures relative power (in dB) at the selected
wavelength.
The display will show the value corresponding to the difference between measured
power and the reference power (in dB) and the wavelength at which it is being measured.
The wavelength at which you wish to measure the relative power can be selected
from those available (ON state, see 4.2.3) by repeatedly pressing the rotary selector until
it appears on the display.
Once you have selected the wavelength, access the configuration menu by pressing
down the rotary selector a few seconds (until you hear a second beep). The active meter
mode will then be shown:
Absolute Mode
in the case of Absolute Power Meter Mode or
Relative Mode
in the case of Relative Power Meter Mode. Select the relative mode by
pressing the rotary selector (
Relative Mode
will appear on the display) and proceed to
obtaining the reference power. To obtain it, turn the selector until you see Set Ref.Level
on the display and keep pressed down until the instrument finishes data acquisition,
automatically leaves the configuration menu and begins to measure using the new
reference value. During the acquisition process, the display will show a series of asterisks
appearing from left to right, indicating how the acquisition is proceeding.
If you stop pressing the rotary selector during the acquisition process, the process
halts and the instrument continues to use the previous reference value.
The instrument stores a reference power for each available wavelength. In the case of
no new reference power being measured, the value used by the instrument will
correspond to the last reference power obtained.