Atec LS-1310-1550 User Manual

LS-1310/1550

Laser Source

Service Information Sheet

Introduction

This Service Information Sheet provides the following service information for the LS-1310/1550 Laser Source (hereafter referred to as "the laser source").

• Precautions and safety information

• Parts and service information

• Specifications

• Cleaning procedures

• Required equipment

• Performance tests

• Calibration adjustments

• Diagrams showing calibration measurement

and adjustment points

• Parts and accessories lists

For operating instructions, refer to the LS-1310/1550 Laser Source Instruction Sheet.

Precautions and Safety Information

• Always clean the fiber optic connectors before

use.

• Before testing, let the laser source stabilize for

2 minutes after you turn it on.

Warning: Class I Laser Product

To avoid injury, do not service the source unless you are qualified to do so.

To avoid possible exposure to hazardous laser radiation and to prevent eye damage

Never look directly into the source connector. Though the laser radiation is invisible, it can damage your eyes.

Do not modify the source. Do not magnify or otherwise modify the

laser output. Use only approved connectors and adapters.

Do not use controls, adjustments, or procedures not documented or approved by Fluke Corporation.

Caution

While servicing the laser source, always follow guidelines for preventing electrostatic discharge (ESD). Otherwise, ESD can damage sensitive compone nts, causing immediate or delayed failure of the source.

Parts and Service

The source is warranted to be free from defects in material and workmanship for one year, while under normal use. Parts and repairs are warranted for 90 days. Refer to the laser source instruction sheet for the complete warranty statement.

To order parts, or for warranty service, contact Fluke as follows:

U.S.A.: 1-888-993-5853 Canada: 1-800-363-5853 Europe: +31-402-675-200 Japan: +81-3-3434-0181 Singapore: +65-738-5655 Anywhere in the world: +1-425-446-4519

For operating assistance in the USA, call 1-800-283-5853.

Visit the Fluke Networks web site at www.flukenetworks.com.

PN 688967 November 1997, Rev. 1, 9/01

LS-1310/1550 Laser Source

Specifications

Accuracy is specified for a period of one year after calibration, at 18 °C to 28 °C (64 °F to 82 °F) with relative humidity to 90%. Specifications are shown in Table 1.

Table 1. Specifications

Emitter Type Laser Laser

Classification Safety Complies with ANSI/ISA S82.01-

Output Wavelengths

Output Connector Singlemode ST Output Power

(CW) Output Level

Stability

Temperature Range

Power Source 9 V battery Size 17.4 cm x 7.6 cm x 3.8 cm

Weight 266 g (9.38 oz) Battery Life 16 hours typical (alkaline) Indicators SOURCE ACTIVE (power on)

Class 1

1994, CSA C22.2 No. 1010.1-92, EN61010.1: 1993

1310 nm ±20 nm 1550 nm ±30 nm

-10 dBm (100 µW) adjustable

At 25 °C after a 15-minute warm-up:

±0.2 dB over 1 hour ±0.4 dB over 8 hours

Operating: 0 °C to 40 °C Storage: -10 °C to +60 °C

(6.9 in x 3.0 in x 1.5 in)

LED LOW BATTERY LED

Cleaning the Optical Connector

Most problems with optical sources result from contaminated connectors. Therefore, always clean the connector before troubleshooting or calibration.

To clean the source connector, wipe it gently with an optical-grade tissue or swab dampened with optical-grade alcohol. To remove loose dirt and dust from the connector, use filtered, compressed air.

Always cover the connector with a dust cap when the unit is not in use.

Required Equipment

The following equipment is required for performance tests and calibration adjustments:

• Fiber optic power meter calibrated at 1310 nm

and 1550 nm

• 0-10 V dc adjustable power supply with a

minimum output of 500 mA and a current-limit adjustment

• Fluke 187 DMM (digital multimeter),

equivalent, or better

• 20 MHz digital or analog oscilloscope,

equivalent, or better

• Optical power meter (OPM) traceable to local

national standards

• ST/ST singlemode fiber patch cable

Note

Using a multimode fiber patch cable will cause calibration errors.

Performance Tests

Use the performance tests to confirm that the source is working properly. If the source fails any of these tests, clean the fiber connectors, verify that the connections are solid, then retest the laser source. If the source still fails a test, it needs calibration adjustments or repair.

1. Turn on the optical power meter (OPM).

2. Set the laser source's power switch to 1310 nm.

Verify that the briefly before the on. Let the laser source stabilize for 5 minutes.

3. Using a singlemode fiber patch cable, connect

the laser source to the OPM.

4. Set the OPM to measure 1310 nm. Set the laser

source's

5. Verify that the power reading is -10.00 dBm

±0.5 dB.

6. Set the laser source’s CW/MOD switch to

MOD. Verify that the power reading increases by 0.6 dBm +0.3 dB.

7. Set the laser source's CW/MOD switch to CW;

set the power switch to 1550 nm. Set the OPM to measure 1550 nm.

8. Repeat steps 5, 6, and 7.

9. Turn off the laser source. Disconnect the fiber

patch cable; then install the dust caps on the source.

LOW BATTERY LED flashes

SOURCE ACTIVE LED turns

CW/MOD switch to CW.

Service Information Sheet

Calibration Adjustments for Serial Numbers

79130000

Calibration Adjustments for Serial Numbers < 79130000

(for later serial numbers, see page 6)

To ensure that the laser source performs to specifications, calibrate it annually using the procedure that follows.

Always perform the complete calibration adjustment procedure.

Step 1: Preparing for Calibration

Before you start the calibration procedures described in this sheet, do the following (refer to Figure 1 for locations of components on the circuit board):

1-1. Turn off the laser source. 1-2. Remove the battery door and the 9 V battery. 1-3. Remove the four Phillips screws from the back

of the source. Remove the top case.

1-4. Unscrew the external retaining nuts from the

source’s power switch and

1-5. Carefully remove the laser source circuit board

from the bottom case. Take care to not strain the fiber that connects the circuit board to the ST connector mounted in the bottom case.

1-6. Before applying power to the source, do the

following: a. Remove the jumpers from J2 and J4. b. Adjust the internal potentiometers R4 and

R14 to their full counterclockwise positions. You will hear a faint click at the full counterclockwise position.

c. Adjust the external

potentiometers (R24 and R35) to their full clockwise positions. You will hear a faint click at the full clockwise position.

1-7. Adjust the dc power supply to 10 V ±0.25 V

with the output current limited to 250 mA. Connect the power supply's positive lead to BT1 on the source; connect the negative lead to BT2.

1-8. Set the laser source's

CW position.

CW/MOD switch.

OUTPUT ADJUST

CW/MOD switch to the

1-9. Set the laser source's power switch to either

the 1310 nm or 1550 nm position. Verify that the laser source and the

SOURCE ACTIVE LED is on.

LOW BATTERY LED is off

Step 2: Checking the Laser Drive Voltage

Use the following procedure to check the drive voltage for the laser diodes and to verify that the laser source's low battery detection circuit is operating properly.

2-1. Set up the DMM to measure dc voltage.

Connect the DMM to the laser drive voltage between J2-6 and J2-4 (Gnd). Verify that the voltage is between 3.2 V dc and 3.5 V dc. Record this measurement for use in the next step.

Note

To avoid overshooting the target voltage in the

next step, slow the adjustment rate on the power supply as the voltage approaches 7 V.

2-2. Decrease the power supply voltage just until

the laser source's Verify the following:

a. The power supply voltage is between

5.4 V dc and 6.2 V dc.

b. The DMM reading has changed less than

0.3 V dc from the reading you recorded in step 1.

2-3. Connect the DMM's positive lead to U3-5.

Verify the reading to be < 500 mV dc.

2-4. Turn off the laser source and the power

supply. Remove the power supply leads from the laser source's battery terminals.

2-5. Reassemble the bottom case, as follows:

a. Verify that the star washers are in place at

the bases of the laser source switches; then carefully reinstall the PCA into the bottom case. Ensure that the fiber connecting the circuit board to the ST connector is not pinched between the board and the case.

b. Reinstall the external retaining nuts on the

laser source's power switch and switch.

LOW BATTERY LED lights.

CW/MOD

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