SEFRAM 7951 User manual

SEFRAM 7951 / 7951M
Optical light source

2
Thank you for choosing Sefram’s product, we always do our best for your
satisfaction.
Contents
1. O v e r v i e w … … … … … … … … … … … … … … … … … … … … … … .3
2. Features………………………….………………………...……..3
3. Ap p l i c a t i o n s … … … . … … … … …… … … … .……………..……...3
4. Specifications………….…………………………….………......4
5. Standard Packages…………………………………….….…….5
6. Panel & Functions……………………………………… .………..5
7. Operation and Notes……………………………..…….…….....6
8. M a i n t e n a n c e … … … … … … … … … … … … … .…………….……..6
9. Trouble– s h o o t i n g … … … … … … … … … … … … … … … … .…….7
10. Warranty and Service……………………………………….......7
…………………………………………………………………………………
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 7951 A 00 / 11-2011

3
1 Overview
SEFRAM 7951/7951M optical light source is one of the latest self
developed test instrument.It can provide 4 wavelength output for the single
mode fiber and for the multimode fiber.
Together with SEFRAM 7940 optical power meter, it acts as a perfect
solution for the fiber optic network work.
2 Features
Providing 2 wavelengths output
CW, 270Hz,1KHz,2KHz modulation output
High stability of the output power
Stable output wavelength
Compact size and professional design
Large LCD, easy operation
3 Applications
Telecommunication networks
CATV networks
Cabling systems engineering
Research and education

4
4 Technical Specifications
Type
SEFRAM 7951 / 7951M
Wavelengths
1310 and 1550nm for SEFRAM7951
850 and 1300nm for SEFRAM7951M
Emitter Type
Laser Diode
Typical Output Power
-7dBm
Spectral Width
≤10nm
Output Stability
±0.05dB/15mins; ±0.1dB/ 8hours
Modulation Frequencies
CW, 270Hz,1KHz, 2KHz
Optical Connector
FC/PC，SC/PC, ST/PC
Power Supply
3 AA 1.5V alkaline batteries
Battery Operating
45 hours typical
Operating Temperature
-10°C to +60°C
Storage Temperature
-25°C to +70°C
Dimension
152 x 74 x 26 mm
Weight
180g
Warranty
2 years
SEFRAM Recommendation
SEFRAM 7951/7951M Handheld Light Source is designed for optimal use with SEFRAM 7940
Optical Power Meter for measuring optical loss on both single mode and multimode fiber cable.

5
5 Standard Packages
Unpack the SEFRAM 7951/7951M packing and check that the
following standard components are included with your order.
SEFRAM 7951/7951M Handheld Light Source…..……….…………….1
Manual…………………………………………………………………...…….1
Protective Holster……………………………………………….……….……1
1.5V battery……………………………………………...…….………………3
Carrying pouch………………..…………………………………………..…..1
6 Panels and Functions
Keys and Functions:
(1) Wavelengths output ports: FC/PC type connectors.
(2) Liquid Crystal Display: For wavelength display; Modulation indicator.
(3) “ON/OFF” Key: Press to turn the SEFRAM 7951 On or Off.
(4) “λ” key: For wavelength selection
(5) ”Mode” key: Modulation control: When modulated light output is
selected, a dot appears in LCD.
1
3
2
4
5

6
7 Operation
7.1 Press “ON/OFF” key about one second to switch on SEFRAM
7951/7951M
7.2 To use SEFRAM 7951/7951M light source.
1. Connection: FC/PC connector.
2. Wavelength selection: Press “Wave”key for wavelength selection
between the 2 available.
3. Modulation: Press the “MODE” key, choose “270Hz”,”1KHz” or “2KHz”
light output.
7.4 Switch off: Press “ON/OFF” key to switch SEFRAM 7951/7951M off.
8 Maintenance
8.1 If the SEFRAM 7951/7951M Handheld Light Source is not used for a
long time, the light output port must be protected with the dustproof hat.
8.2 When the SEFRAM 7951/7951M Handheld Light Source is used for a
period of time, the output port maybe polluted. It results in the output power
decreasing. So the connector must be cleaned with alcohol cotton. If it
couldn’t be cleaned, please send it to the manufacturer.
8.3 Once not using for a long time, please take out the battery.
8.4 Don’t take apart the SEFRAM 7951/7951M Handheld Light Source
please. If there are any other troubles, please contact with the
manufacturer or your distributor.
8.5 DO NOT look into SEFRAM 7951/7951M adapters directly when light
source is on, laser output does harm to your eyes.

7
9 Trouble-shooting
Problem
Measures
The output light is unstable
or decreases rapidly while operation.
Change battery or re-charge
battery.
Output power is fluctuating.
After warm-up for 15
minutes, then operate it.
The output port is polluted.
Clean the connector with
alcohol smoothly or contact
with cotton swaps.
10 Warranty and Service
Caution: Repair it in the field is NOT recommended.
Warranty for SEFRAM 7951/7951M Light Source
SEFRAM warrants that SEFRAM 7951/7951M Light Source will be free
from defects in material and workmanship for a period of 24 months. This
warranty covers the original user only and is not transferable. Should the
device fail at any time during this warranty period, SEFRAM will, at its sole
discretion, replace, repair or refund the purchase price of the product.
This warranty is limited to defects in workmanship and materials and does
not cover damage from neglect, contamination, misuse or abnormal
conditions of operation or handling.
To establish original ownership and provide date of purchase, please add a
copy of your invoice with the instrument.

8
SEFRAM
32, rue Edouard MARTEL
BP 55
F42009 SAINT-ETIENNE Cedex 2
Phone : [phone]
Fax : [phone]
Mail : [e-mail]
Web : www.sefram.fr