Measuring Absolute Power; Measuring Relative Power - JDS Uniphase RX3 Series User Manual

If the SETUP key is pressed when the meter is set to either Backreflection or Power mode, the
meter measures the loss of connectors and calculates the offset to be used in the backreflection
measurements. The meter also zeros the reference power (for example, REF). Therefore, once
the setup for a jumper has been performed in either mode, the meter is ready to display the
backreflection or loss of the DUT attached to that jumper.

Measuring Absolute Power

In Absolute Power mode, measurements are displayed in dBm. To make an absolute power
measurement of a DUT after performing the setup described in the Setting Up the Meter for
Loss and Power Measurements section:
1. Press the POWER key to set the meter to Absolute Power mode, indicated on the screen as
ABS.
2. Press the or key to select the required output port.
3. Press the key to select the wavelength at which the measurement is to be made.
4. Clean and connect the output connector of the DUT to the detector on the front of the meter.
The detector must be equipped with the appropriate detector adapter. The RX3 meter
displays the DUT absolute power output.
5. If a measurement is to be made at a second wavelength, repeat steps 4 and 5, and then
read the DUT absolute power.

Measuring Relative Power

Relative power is expressed as the negative value of the insertion loss, for example -31 dB for
insertion loss 31 dB. Relative power is displayed by the loss meter in dB.
To make a relative power measurement of a DUT after performing the setup steps in the
Setting Up the Meter for Loss and Power Measurements section):
1. Press the POWER key to set the meter to Relative Power mode. When the meter is in
Relative Power mode, measurements are displayed in dB and the mode is indicated.
2. Press the or key to select the required output port.
3. Press the key to select the wavelength at which the measurement is to be made.
4. Clean the output connector of the measurement jumper and the input connector of the DUT,
and then connect the two connectors.
5. Connect the input connector of the DUT to the output of the measurement jumper.
6. Connect the output connector of the DUT to the detector on the front of the RX3 meter. The
meter displays the loss due to the DUT (Figure 14).
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