Promax PROLITE-75 Mode D'emploi page 56

Figure 7.- GPON METER main screen in ABSOLUTE mode.
The screen shows a box chart divided into three equal parts. Each one shows the
power level for a given wavelength, in a graphical and numerical way. At the bottom it
identifies what wavelength belongs to each division. Left division corresponds to the
wavelength 1310 nm of UPSTREAM and the other two (1490 and 1550 nm) to the
DOWNSTREAM.
The ABSOLUTE measurement mode is the measurement of the absolute value
of the signal strength in dBm (dB referred to 1 mW), as opposed to LOSSES mode
representing the measure of the signal power in dB.
The AVERAGE power of the Upstream signal (1310 nm) is represented
graphically superimposed on the peak value in opaque texture.
Two marks in each division (--- x ---) represent the maximum and minimum
threshold values for each wavelength.
The screen displays status messages depending on the power level in relation to
the maximum and minimum threshold values (see figure 7). They are next:
When the power is below the minimum threshold value it will appear the status
message LOW.
When the power is within the threshold values, the status message will be GOOD.
When the power is above the maximum threshold value, the status message will
be HIGH.
At the bottom of the screen it is displayed the THRESHOLD GROUP to which
belongs the threshold values shown on screen. It shows the given name of the
threshold group using currently. Threshold values can be grouped and saved in the
memory of the instrument. Then, you can select the one more suited you want. If this
field is shaded, pressing the arrow keys
threshold values saved on the memory.
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USER'S MANUAL. PROLITE-75
[11] you can move among the groups of
04-2009