JDS Uniphase RM3750 Backreflection Calibration Adjustment, Power Calibration Adjustment

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RM3 SERIES BACKREFLECTION METER

USER’S MANUAL

Backreflection Calibration Adjustment

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 BR0 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.

Power Calibration Adjustment

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.

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Contents RM3 Series Backreflection Meter User’s ManualContents Customized Features and Test Data Programming GuideSafety Information, Instructions, and Symbols Safety InformationClass Laser Product Operating the Unit Safety InstructionsBefore Initializing and Operating the Unit RM3 Series Backreflection Meter USER’S Manual Proceeding Safety SymbolsSymbol FDA-CDRH Compliance CSA / IEC Compliance ComplianceCE Compliance RM3 Series Backreflection Meter USER’S Manual General Information and Specifications General InformationLoss and Power Measurements Backreflection MeasurementsKey Features Output PortInternal Light Sources Hybrid JumpersApplications Standard AccessoriesOptional Accessories Specifications Parameter Specification Single-mode MultimodeFlexcor is a trademark of CorningR Environmental ElectricalPhysical Initial Inspection Getting StartedBefore Initializing and Operating the Unit Operating Environment Storing and ShippingCleaning Connectors Powering Up the Meter Connector Cleaning connector type can varyKey/LED Description Operating and Maintenance InstructionsFront Panel Rear Panel Termination TechniquesComponent Function Termination Techniques for Single-mode Fiber except 980 nmMeasuring Backreflection for Single-mode except 980 nm Setting Up the Meter for Backreflection Measurements Backreflection MeasurementsMeasuring Backreflection Backreflection Accuracy and Range Loss and Power MeasurementsSetting Up the Meter for Loss and Power Measurements Measuring Power Loss and Power Measurements Measuring Relative Power Insertion Loss Measuring Absolute PowerData Logging Using the Foot Pedal Messages and SymbolsPower Accuracy Display DescriptionCalibrating the Meter StabilizingBackreflection Calibration Adjustment Power Calibration AdjustmentMaintaining the Meter Cleaning the UnitCleaning the Connector Ends Troubleshooting Recharging the BatteryReplacement of Internal Fuses Front Panel Connectors Long Cables for single mode model only, except 980 nm modelLoss Before the DUT Reflections Before the DUTOther Display Problem Solution Laser StabilityCalibration Up the Meter for BackreflectionRS232 Interface Specifications Name Symbol Pin Number Signal DirectionProgramming Guide RS232 Serial InterfaceCommand Action Left Dip Switch Switch Setting MeaningRight Dip Switch RS232-GPIB ConverterProgramming Examples RS232 Interface Program ExampleCustomized Features and Test Data
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