MAY640 Live Fiber PON OTDR Optical Time Domain Reflectometer 1650nm Touch Screen OLS OPM VFL IL Testing Event Map


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MAY640 OTDR is a new generation of portable and intelligent measuring instrument for testing fiber optic communication system. It adopts 7 inch touch screen and integrates SEVEN major functional modules, which help customers effectively solve the field testing and maintenance.

It is mainly used to measure the length, loss and connection quality of optical fibers and cables, and can be widely used in engineering construction, network maintenance and testing, emergency repair, and the development and production of optical fibers and cables.
The highest 45dB dynamic range can penetrate optical splitters easily for PON network testing.
The design concept of multi-functional integration, precision testing and convenient operation makes the field testing simple.


  • Minimum 0.8m Event Dead Zone, easy to test 5m length patchcord
  • Live fiber warning in case of damaging OTDR diode
  • OTDR Viewer software for data analysis, single printing and batch printing of test report
  • Integrated design, smart and rugged
  • Shockproof, outdoor enhancement
  • Automatic and manual test function
  • OTDR Viewer software for data analysis
  • Simultaneous testing of multi wavelengths
  • Launch Fiber Length and Receive Fiber Length setting


  • FTTX testingwith PON networks
  • CATV network testing
  • Access network testing
  • LAN network testing
  • Metro network testing
  • Laband Factory testing
  • FTTA troubleshooting

2. Event Map
Event Map can display events in user-friendly icons.
3. Laser Source (LS)
4. Optical Power Meter (OPM)
5. Visual Fault Locator (VFL)
Visual Fault Locator uses red laser of 650nm to locate broken fiber point and test fiber continuity.
6. IL Testing (LS and OPM)
OPM and OLS can be opened at the same time to test insertion loss.
7. Fiber Optic Connector Endface Microscope (EFD)
Fiber Optic Connector Endface Microscope is used to check fiber optic connector endface. The inspection probe is sold seperately.
8. Report Print
PC software helps print out OTDR test reports. It supports files batch processing.


Model MAY640-C38
Wavelength 1650±5nm (filtered)
Filter Band pass 1650±7nm (1650±10nm)
Isolation >40dB
Dynamic Range 38dB
Event Dead Zone 0.8m
Attenuation Dead Zone 6m
PON Dead Zone 30m
Fiber Type SMF
Measurement Range 0.5/1/2/4/8/16/32/64/128/256km
Pulse Width 3/5/10/30/50/80/160/320/500/800/1000/3000/5000/8000/10000/20000ns
Ranging Accuracy ±(0.75+Sampling interval+0.005%*Test distance)
Loss Accuracy ±0.05dB/dB
Sampling Points Max. 256,000 points
Sampling Resolution 0.05~16m
Reflection Accuracy ±3dB
File Format SOR standard file format
Loss Analysis 4-point method / 5-point method
Laser Safety Level Class II
Refresh Rate 3Hz (Typ.)
Adapter FC (Interchangeable SC adapter)
Language Chinese, English, Russian, Spanish, Turkish, German (Select two languages)

2. Optical Power Meter

Wavelength Range 800~1700nm
Calibrated Wavelength 850/1300/1310/1490/1550/1625/1650nm
Test Range -50~+26dBm
Resolution 0.01dB
Uncertainty ±5%
Connector FC (SC interchangeable)

3. Optical Light Source

Working Wavelength Same as OTDR output wavelength
Output Power ≥-5dBm
Mode CW/270Hz/330Hz/1kHz/2kHz
Accuracy CW, ±0.5dB/15min (Test after 15 minutes of boot-up preheating)
Connector FC (SC interchangeable)

4. Visual Fault Locator

Wavelength 650nm±20nm
Power ≥10mW
Mode CW/1Hz/2Hz
Connector FC (SC interchangeable)

5. Fiber Optic Connector Endface Microscope (EFD)(Optional ):

Magnification 400X
Resolution 0.5µm
Focus Control manual
Dimension 155×44×40mm
Weight 187g
USB 1.1/2.0
Adapter SC-PC-F (For SC/PC adapter)

LC-PC-F (For LC/PC adapter)

2.5mm-PC-M (For 2.5mm connector, SC/PC, FC/PC, ST/PC)

1.25mm-PC-M (For 1.25mm connector, LC/PC)

Optional Tips for Fiber Optic Microscope (FIM):

Name Quantity
2.5mm-APC-M Tip (For 2.5mm APC connector, SC/APC, FC/APC, ST/APC) 1pc
1.25mm-APC-M (For 1.25mm APC connector, LC/APC) 1pc
SC-APC-F Tip (For SC/APC adaptor) 1pc
FC-APC-F Tip (For FC/APC adaptor) 1pc
LC-APC-F Tip (For LC/APC adaptor) 1pc

Other Specification:

Display 7 inch color LCD with touch screen
Power Supply AC/DC adapter, input: 100~240V, 50/60Hz, 0.6A, Output:12V~19V, 1.5A, Lithium battery: 7.4V 5200mAh
Data Interface USB, Mini USB, 10/100Mbit/s Ethernet Port
Data Storage Internal storage: 200,000 curves; external storage: 4GB
Weight 1.2kg
Size 227*160*70mm
Operating Temperature -10 ~ +50°C
Storage Temperature -40 ~ +70°C
Relative Humidity <95% Non-condensation


Item Name Quantity
1 OTDR with FC adapters 1pc
2 AC/DC power adapter 1pc
3 Wrist Strap 1pc
4 U disk (including simulation analysis software) 1pc
5 Data line 1pc
6 SC adapter for OTDR and VFL Ports 1pc
7 SC adapter for OPM Port 1pc
8 User manual 1pc
9 Calibration Certificate 1pc
10 Carrying bag 1pc
11 Warranty Card 1pc

Ordering Information:

Model MAY640
Wavelength and Dynamic Range C38: 1650nm, 38dB
Connector None: FC/UPC and SC/UPC (default)


Weight 3 kg
Dimensions 30 × 20 × 25 cm
OTDR Port:



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