CETC41 AV2498C User manual

AV2498C Optical Multimeter
User Guide
The 41st Institute of China Electronics Technology Group
Corporation

Preface
Thank you very much for choosing the AV2498C
Optical Multimeter which is produced by the 41st Institute
of China Electronics Technology Group Corporation
(abbreviated as CETC41)! This product has higher
price-performance ratio than other products alike due to the
robust structure and simple operation. Please read this
Guide carefully for your convenience. We will do our
utmost to meet your needs, provide you with high quality
measurement instruments, as well as first-class after-sales
service. Our principle is “excellent quality, courteous
service”. To provide satisfactory products and service is our
commitment to the users. We sincerely welcome your

inquiry：
Toll-free phone: [phone]
Website: http://www.ei41.com
HQ(Bengbu)
Service & consultation: 0552－4072248
Technical Support: 0552-4071248
Quality Supervision: 0552-4078248
FAX:[phone]
Email:[email protected]
ADD: No.726 Huaguang Avenue, Bengbu, Anhui
Post Code:233006
Branch Institute (Qingdao)
Service & consultation:0532－86889847
Technical Support: 0532－86889847
Quality Supervision: 0532－86886614
FAX: [phone]

Email:[e-mail]
ADD: No.98, Xiangjiang Rd, Qingdao
Economic&Technological Development Zone,Shandong
Post Code:266555

Statement
This is the first edition of User Guide of AV2498C
Optical Multimeter. The version number is
AV2.714.1291SS1.
The contents in this Guide are subject to change
without notice.
The right to interpret the contents and terms of
this Guide belongs to CETC41.
This Guide comes without a guarantee from
CETC41, including, but not limited to, the implied
warranty of merchantability and fitness for a particular

purpose. In no event shall CETC41 be liable for special,
incidental, or consequential damages.
The copyright of this Guide belongs to CETC41.
No unit and individual shall revise or distort this
manual without authorization. The Guide shall not be
reproduced and transmitted in any form (including
electronic storage, a retrieval system or translation to
other languages) for the purpose of profit. CETC41
reserves the right to take legal action for the tort.

Ann
ounc
eme
nt：
Any attempt to disassemble or modify any components not
illustrated in this Guide is not allowed. If so, degradation of
electromagnetic shielding effectiveness and damages of
internal components will impact reliability of AV2498C
Optical Multimeter. CETC41 offers no free repair even
though the warranty period is still valid.
April 10th,2016

Table of Contents
Chapter OneOverview ………………………………………1
Chapter TwoAppearance and operation instructions...............7
Section OneAppearance and keypad......……………….8
Section TwoOperation Instructions.....………………..17
Chapter ThreeOperating principles and technical
specifications.........................................................................27
Section OneOperating principles ..................................27
Section Two Technical specifications............................29
Chapter FourMaintenance and repair....................................33

Chapter One Overview
1
Chapter One Overview
1.1 Multimeter overview
AV2498C is a handheld meter, enjoys innovative
structure and small size. The optical detector is built inside
your convenient usage. The multimeter has a rechargeable
battery inside, and dry cell batteries can also be used for
field work. When using as a light source, the multimeter is
also a system enabling loss parameters measurements of
optical fibers, cables, optical passive components etc.
AV2498C multimeter deploys a high-quality
low-noise photodiode as the optical detector, and

Chapter One Overview
2
microcontrollers for control, which is powerful in functions,
reliable in performance, competitive in price-performance,
small in size and neat in appearance. It is suitable for
construction and maintenance of optical fiber
communication projects, and an ideal optical power and
optical loss measurement instrument in scientific research,
production and mathematics fields. For high power tests,
please choose a power meter with the measurement range
of -50dBm～+26dBm.
1.2 Multimeter composition
Here are three options for the power meter modules of

Chapter One Overview
3
AV2498Cmultimeter. The power meter has two types based
on different power detecting ranges, as shown in Table 1-1.
Table 1-1 Module types of the power meter of AV2498C
Optical Multimeter
Module
No.
P1
P2
P3
Power
range
-70dBm～
+3dBm
-50dBm～
+26dBm
-50dBm～
+3dBm
The light source offers two central wavelengths, as
shown in Table 1-2.
Table 1-2 Light source types of AV2498C Optical

Chapter One Overview
4
Multimeter
Central
wavelengths
1310nm±20nm
1550nm±20nm
Output
optical
power
≥-3dBm
≥-3dBm
This Guide contains four chapters.
Chapter One introduces applications and
characteristics of AV2498Cmultimeter.
Chapter Two introduces appearance and operation
instructions of AV2498Cmultimeter.

Chapter One Overview
5
Chapter Three introduces fundamental operating
principles and technical specifications
ofAV2498Cmultimeter.
Chapter Four introduces maintenance and simple
troubleshooting of AV2498Cmultimeter.

Chapter One Overview
6
We sincerely hope our products can bring you
convenience and efficiency. Please contact us if you
encounter any problems during operation.

Chapter Four Maintenance and Repair
7
Chapter Two Structure and Operation Instructions
The keypad is used for control and setting and an
LCD is for display. Three power sources are available for
AV2498Cmultimeter, including a rechargeable battery, a
power adapter or any other systems connecting to USB
interface for power supply. Three AA dry cell batteries can
also supply power for the multimeter when the said sources
are not available. It is able to store, review results and
communicate with host computers.

Chapter Four Maintenance and Repair
8
Section One Appearance
1 Front and rear panels and keys illustrations
The front and rear panels are shown in Fig. 2-1.

Chapter Four Maintenance and Repair
9
a)
b)
c)
d)
e)
f)
h)
i)
g)
Fig. 2-1 Front and rear panels
a）【 Power】： power switch. The charge indicator is

Chapter Four Maintenance and Repair
10
under the【Power】switch. The battery is charging
when the indicator is lit, and finishes charge when
the light is out.
b）【 Zero】： press this key for zero. This function is
enabled only when the port protector is closed or
light is absent. It can delete the record being
checked during data review.
c）【 λ】： to set up wavelengths at
1550nm,850nm,1300nm, 1310nm in order. It can
check the previous record during data review.
d）【 Protector】： to protect the light interface.

Chapter Four Maintenance and Repair
11
e）【 Display】： to display optical power measurement
results and all indications.
f）【 Store 】： press this key to save logarithm
measurement results. Press it to exit the review
mode.
g）【 dBm/dB/W】： to switch between measurement
modes. Logarithm measurement is the default
mode when the multimeter is power-on. Press it to
switch between logarithm measurement（dBm）,
relative measurement （dB ）and linearity
measurement（W）, the switching sequence is:

Chapter Four Maintenance and Repair
12
Logarithm measurement Relative measurement
Linearity measurement Logarithm measurement
h）【 Data】： to review data. Press this key to display
final results stored. Serial number of the current
data and number of stored data will be displayed at
the top of the screen, the format is S/N/No. Press
【λ】and 【Data】to view data by Page Up and
Page Down. Press 【Save】to return AV2498C
multimeter back to automatic measurement. Press
this key to check the next record during data
review.