SEFRAM 7940 Series Manuale utente

SEFRAM 7940

Optical Power Meter

Content

1. Overview………………………………….……….…………03

2. Specifications………………………...…………………….03

3. Standard Packages…………………….…………………..04

4. Components Guide………………...……………………...05

5. Operation and Notes………………...…………………….06

6. Maintenance…………...……………..…………………….09

7. Troubleshooting……………………………………….…..10

8. Changing battery…………………………………….…….10

9. Warranty and Servicing…………………………….…….11

…………………………………………………………………………………………

The information contained in this document is assumed to be correct

and current. The manufacturer is not responsible for errors of

omissions and reserves the right to change specifications at any

time without notice.

M 7940A 00 / 08-2011

1. Overview

SEFRAM has designed the SEFRAM 7940 series optical power meter to meet

the high demand. It can be used for the absolute power measurement and

relative measurement of the link loss in dB. Its compact size, friendly

operation interface, broad power measurement range, high precision and

brand-new user automatic calibration function and high performance in

application makes it an ideal tool for optical fiber network.

SEFRAM 7940 Specifications:

Wavelength: 850nm, 980nm, 1300nm, 1310 nm, 1490nm, 1550nm

Measurement Range: -50 to +26dBm

2. Specifications

Model

SEFRAM 7940

Wavelength Range（nm）*1

800~1600

Detector Type

InGaAs

MeasurementRange（dBm）*2

-50~+26

Uncertainty*3

±0.15dB

Accuracy

Linear 0.1% or Nonlinear 0.01dBm

Operating Temperature（°C）

-10 to +60°C

Storage Temperature（°C）

-25 to+70°C

Auto-off Time（min）

Operating Time（h）

≥130

Battery

3 AA1.5V

Weight（g）

200

Dimensions（mm）

152X74X26

Notes:

1. Wavelength Range: Specified standard operating wavelength range in

which the Power Meter can work properly under certain technical

specifications.

2. Power Measurement Range: The maximum and minimum range in which

the Power Meter can work properly.

3. Uncertainty: Difference between two measurement results that were tested

by Power Meter and another Standard Power Meter respectively.

3. Standard packages

1. SEFRAM 7940 Handheld Power Meter……………….. 1

2. Manual………………………………………………….… 1

3. Protective Holster………………………………………… 1

4. 1.5V AA Battery………………………………………….... 3

5. Cotton Swabs…………………………………………….. 1

4. Components Guide

(1) LCD: The LCD screen display the measurement tested in dB, dBm,

mW, uW, nW unit; the selected wavelength; the current operating situation

and so on.

(2) ON/OFF Key: Press the key to turn the unit on/off.

(3) dB Key: To test the power value under certain wavelength.

(4) ZERO Key: Press the key for auto-zero.

(5) “λ” Key: To switch the current operating wavelength between

850nm、980nm、1300nm、1310nm、1550nm.

(6) LIGHT Key: To turn the background light on/off.

(1) LCD

(3) dB

(6) Backlight

(5) λ

(2) ON/OFF

(1) LCD

(4) Zero

(7) HOLD

5. Operation and Notes

5.1 ON/OFF

(1) Press the On/Off key for a few seconds to turn on the unit

(2) Press the On/Off key for a few seconds to turn off the unit

5.2 Absolute power measurement

(1) Turn on the Power Meter

(2) Press the λ key to switch between the wavelengths. The default

wavelength is 1310nm.

(3) Connect the light to be measured, and then reading will be

displayed on the LCD screen, including Linear and nonlinear

value.

5.3 Relative power measurement.

(1) Select the wavelength to be measured.

(2) Under “Absolute power measurement mode”, connect to the

light to be tested.

(3) Press dB key, then current power value is stored as a

reference value in dB unit. At the same time it also display

the current absolute power value and current relative value is

0dB.

(4) Connect to another beam of light to be tested, display the

current relative power value and absolute power value under

tested.

5.4 Special function

SEFRAM 7940 has 3 kinds of working mode: (1) Factory Mode

(2) User Mode

(3) Working Mode

5.4.1 Factory Mode: The factory is responsible for the test and calibration

5.4.2 User Mode: Press the λ + Light key synchronously, and then enter the

User mode. A sign "T" will be displayed at the left side of the display. Press

theλ + Light key synchronously once again, it exit from the User mode and

enter the Working mode. (the T sign will disappear).

Function

Button

―――

Plus 0.05

Light

―――

Minus 0.05

―――

Store

Zero

―――

Switch Wavelength

―――

Return to the Factory

Setting

λ+ Zero

―――

Notes: If any errors or mistakes caused by the user self-calibration operation,

please press theλ+ Zero synchronously under the user mode to go back to the

factory setting.

(1) Auto-off : Press LIGHT + dB key to turn on the auto-off function. The

auto-off symbol will be displayed on the top right. The unit will be turn off

automatically after 10 minutes idle time.

(2) Background light On/Off: Under the Working Mode, press LIGHT to turn

the background light On/Off. A little sun symbol will be displayed on the

top right.

Appendix:

Optical fiber loss measurement

Step 1- Optical Reference Level

Turn on optical power meter and press the λ key to select the wavelength.

Turn on optical light source (emitting source) and select the wavelength.

Wait for 1-2 minutes until it stabilize.

Select a piece of patch cords, which is used to connect with the light

source, we call it emitting patch cords. Cleaning connector of the patch

cords. The fiber of the emitting source patch cords must be the same fiber

type as the fiber under test.

Connect the light source (emitting source) with the 7940 through the

emitting source patch cords

SEFRAM 7940 get the power measurement value. This value should be

close to the one that light source (emitting source) set. If it has wide

disparity, please make sure the fiber connection is clean properly else

replace another jumpers.

Press the dB key; the reading 0.00dB will be displayed on the screen. The

tested power values will be set to the reference value.

Step 2-Optical Loss Measurement

Keep the emitting source patch cords connection with the light source

(emitting source).

Connect the 7940 and light source (emitting source) to the optical fiber

link respectively.

Notes: cleaning all the connectors surface including all the necessary optical

adaptors. The reading in dB unit displayed on the screen is the tested optical

fiber link loss.(also display the current absolute optical power value in dBm

unit).

6. Maintenance

1. It is important to keep all optical connectors and surfaces free from oil,

dirt or other contamination to ensure proper operation.

2. Keep using one type of adapter to avoid excess loss from different

connectors.

3. Please use dust proof cap for protection to avoid begin scratched or

contaminated when SEFRAM 7940 not in operation.

4. Light interface is sensitive, please carefully plug in and pull out the

connectors.

5. Please use clean cotton to clean the sensor surface, clean it in

clockwise direction carefully.

6. If does not need to use for a long time, please take out the battery.

7. Trouble shooting

Description

Problem

Method

Faint LCD display

Battery is weak

Change battery

No display after

turning on the unit

Battery is

weak/Others

Turn on the unit

again/Change battery

Insensitive display in

LCD

Light interface is

polluted/

broken/Display

locked

Check connector

carefully and clean

sensor’s interface

8. Change Battery

8.1 If you find battery is weak while operating it, please immediately turn

the unit off and change a new battery.

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