Measuring Power - JDS Uniphase BACKREFLECTION METER RM3750 User Manual

5. Attach the appropriate detector adapter to the detector on the front of the meter.
6. Connect the output connector of the measurement jumper to the detector adapter. This
end of the measurement jumper is user-selected and must be compatible with the input
connector of the DUT.
7. Press the Power key to set the meter to Power mode. When in Power mode, the meter
displays P at the beginning of the reading, and no "rel" is displayed, for example, P = -9
dBm.
8. Press and hold the Power key until the display on the meter clears.
9. Release the Power key. The display reads 0.00 dB, and the loss of the measurement
jumper is subtracted from the DUT loss or power measurements to be made (Figure 7).
For loss and power measurements below -50 dBm:
10. Ensure that the detector is covered, for example, that the detector cap is on or the output
connector is connected to the detector. This dark measurement current is subtracted from
future loss and power measurements.
11. Press the Store I key. The key lamp lights to indicate that the user-stored value of I
D
dark signal from extraneous sources) is used to calculate the DUT loss or power. If the
detector is not sufficiently covered, the message "Too Much Light" is displayed. If the I
value is not stored before a measurement is made, the last value stored is used.

Measuring Power

In Power mode, absolute power measurements are displayed in dBm. To make a 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 Power mode.
2. Press the λ key to select the wavelength at which the measurement is to be done.
3. Clean the output connector of the measurement jumper and the input connector of the
DUT, and connect the two connectors.
10112341 Rev 002
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Figure 7: Loss and Power Measurements
RM3 SERIES BACKREFLECTION METER
USER'S MANUAL
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