JDS Uniphase RM3750 ユーザーズマニュアル

RM3 SERIES BACKREFLECTION METER

USER’S MANUAL

The RM meter has a factory-set backreflection calibration value (User CAL) that compensates
for the typical loss resulting from a connection to the front-panel FC/APC connector. This value
appears in the Inspection Report (see the Customized Features and Test Data section).

To perform a backreflection calibration adjustment:

1.  Press the BR key to set the RM meter to Backreflection mode, which is displayed as BR on

the meter.

 

2.  Clean and connect the APC connector (green boot) of the calibrated jumper to the output

port of the RM meter.

 

3. Press 

the 

λ

 key to select the wavelength at which the calibration check is to be performed.

Choose either wavelength, as you will check both.

 

4.  Clean the output connector of the calibrated jumper. The backreflection value is displayed.

The value displayed on the RM meter must match the reference value that appears in the
inspection report and on the label of the calibrated jumper. If these values do not match,
ensure that the FC/APC connector is properly connected to the RM meter, and clean all the
connectors. If the values still do not match to within ±0.3 dB, adjust the value of User CAL. The
CAL key is located on the rear panel of the RM  meter.

To adjust the value of User CAL:

1.  Use a screwdriver or an appropriately narrow object to press the CAL key on the back of

the RM meter. The last User CAL value stored is displayed on the RM meter.

 

2.  Press and hold the Store BR

0

 key to scroll to the required value in 0.1 dB increments.

 

3.  Press the CAL key to store the User CAL value and return the RM meter to the

backreflection measurement display.

Perform calibration adjustment for the second wavelength:

1. Repeat 

the 

calibration adjustment procedure for the second wavelength.

To perform a power calibration adjustment:

1.  Press the Power key to set the RM meter to Power mode. In Power mode, the meter

displays P at the beginning of the reading, and the value displayed is not followed by “rel”.
An example is P = -9 dBm.

 

2.  Clean and connect the FC/APC connector (green boot) of the calibrated jumper to the

output port of the meter.