Chapter 5
Power meter, VFL (Visual Fault Locator) & Talkset
Using the Power meter
30
User Manual
790000002/00
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 2100
Module Series User Manual).
Performing 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, VFL and Talkset" page 26
).
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
).
4
Press the
S
TART
/S
TOP
key to stop the measurement.
Optical link loss Setting the zero value of the power meter
1
Fix the plug over the optical input of the power meter so that no light
can reach the photodiode of the power meter. If the zero adjustment
is made without this plug, an error message may be displayed, as
the photodiode will detect too much light.
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.
It is important to set the zero of the power meter before making any
measurements where accuracy is required, as the noise from the ger-
manium photodiode fluctuates over time and with variations in tem-
perature.
2000 Platform English rev00.book Page 30 Lundi, 20. juin 2011 1:47 13
