Viavi MTS 4000 Base Unit, Руководство пользователя

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Chapter 5 Power meter, VFL (Visual Fault Locator) and Talkset
Making a measurement
User Manual 77000000206 Rev. 007 71
Unit Allows to modify the unit of power displayed (dB,
dBm, nW)
Zero Adjustment of the Zero value when the power
meter’s optical input is closed with a plug (a
validation is required).
Click on Exit to go back to the Results page.
Pressing the Pow. Reference key allows to reach the following function:
Standard Reference Selects the current result as reference value to
measure the attenuation of a link. This reference
is displayed under the measurement result until a
new reference value is chosen.
Jumper Reference This key can be pressed when a reference in
loopback mode must be performed (see 4100
Module Series User Manual).
Making a measurement
The power meter is started up as soon as the function is acti-
vated in the H
OME
menu.
Power
measurement
1 Connect the light source to be tested to the rear connector (see
"Connection to the power meter" page 67 ).
2 In the
S
ETUP
menu, choose the units dBm, dB or Watts.
3 Press the S
TART
/S
TOP
key to start the measurement .
The result will appear in the results page and can be memorized in
the table (see
"Table of results" page 70 ).
4 Press the S
TART
/S
TOP
key to stop the measurement.
The soft key Jumper Ref is displayed in grey and cannot be
activated if both power meter and Source are selected onto the
OTDR Module set into the Platform.
The power meter must be selected onto the Base-Unit, and the
Source onto the OTDR Module to activate the soft key and be
able to perform a reference measurement in loopback mode.
Power measurement is automatically updated in consequence. The
value «<-60 dB» is displayed when the laser is switched off and if the
source output is looped on to the power meter input.