Performing An Insertion Loss Measurement; Setting The Zero Value Of The Power Meter; Performing A Reference - Viavi OTDR Series User Manual

Chapter 4 Power meter and Source functions on the OTDR test port

Performing an insertion loss measurement

2 On the power meter results page section, select the measurement unit: dBm or
Watts.
3 The power level is displayed in real time when there is light. To keep the
displayed value, press on Keep Result icon. The value is then displayed in the
table (but not saved yet) - see
4 Press Save softkey to record and report the power level measurement.

Performing an insertion loss measurement

A combo light source and power meter is often used to perform an insertion loss
measurement. Few steps must be carried out to get a reliable and accurate loss
measurement.

Setting the zero value of the power meter

1 Close the protective cap of the OTDR port (so no light can be seen by the power
meter photodetector).
2 In the Setup menu, press Zero.
It is important to set the zero of the power meter especially to get accurate
results, as the noise from the germanium photodiode may fluctuate over
time and with temperature variations.
3 Wait until the dialog box Offset nulling completed is displayed.
4 Hit any key to continue.

Performing a reference

Using two equipments, with an OTDR module including a laser source option and a
Power meter option, an insertion loss measurement in continuous wave can be
performed.
Side by side reference
Both units are connected together which requires to have them at the same location.
84
"Table of results" page
User Manual 700MAN201 Rev. 002
81.