MAY420 Mini OTDR

MAY420 Mini OTDR
MAY420 Mini OTDR - Back View
MAY420 Mini OTDR - Top View
MAY420 Mini OTDR Ports

White housing

MAY420 Mini OTDR - Black Color
MAY420 Mini OTDR - Black Color

Black housing

MAY420 Mini OTDR - Packing Box
MAY420 Mini OTDR - Label on Packing Box

Packing Box

MAY420 Mini OTDR - Standard Accessories

Standard Accessories

FC Adapter for OTDR

FC Adapter for OTDR Port (Standard)

SC Adapter for OTDR

SC Adapter for OTDR Port (Standard)

LC Adapter for OTDR

LC Adapter for OTDR Port (Optional

ST Adapter for OTDR

ST Adapter for OTDR Port (Optional)

MAY420 Mini OTDR integrates fiber cable and Ethernet cable testing in one unit. It is a powerful tester for installers of fiber cable and network cable.


  • Support screen capature
  • Integrated design, smart and rugged
  • FC/SC/ST connectors interchangeable
  • Automatic and manual test function
  • OTDR Viewer software for data analysis
  • Cover plate type tempered glass panel, no worry about screen scratch
  • Sink type optical port design for better protection
  • Support U disk, SD card and Micro USB export data protection


  • CATV network testing
  • Access network testing
  • LAN network testing
  • Laband Factory testing
  • FTTA troubleshooting

2. Optical Power Meter (OPM)
3. Visual Fault Locator (VFL)
Visual Fault Locator uses red laser of 650nm to locate broken fiber point and test fiber continuity.
4. Optical Light Source (Laser Source)
5. Network Cable Test
It can check RJ45 Ethernet Cable Sequence
6. Fiber Inspection
Fiber Inspection is used to check fiber optic connector endface. The inspection probe is sold seperately.
7. Event Map
Event Map is similar to EXFO’s iOLM function, which can display events in user-friendly icons.
8. Loss Testing
OPM and OLS can be opened at the same time to test insertion loss.
9. Report Print
PC software helps print out OTDR test reports.
10. LED light

Model MAY420-D22 MAY420-D24 MAY420-D26
Wavelength 1310/1550nm 1310/1550nm 1310/1550nm
Dynamic Range① 22/20dB 24/22dB 26/24dB
Fiber Type SMF
Event Dead Zone② 1.2m
Attenuation Dead Zone 5.5m
Measurement Range 100m, 500m, 2km, 5km, 10km, 20km, 40km, 60km, 100km
Measurement Pulse Width 5ns, 10ns, 20ns, 50ns, 100ns, 200ns, 500ns, 1us, 2us, 5us, 10us
Ranging Accuracy ±(0.5+Range×3×10-5+sampling resolution) (Excluding refractive index error)
Sampling Resolution Minimum 0.2m
Samping Points 64,000 points
Linearity ≤0.05dB/dB
Loss Threshold 0.01dB
Loss Resolution 0.001dB
Range resolution 0.01m
Refracton Setting 1.2000~1.5999, 0.0001 step
File Format SOR standard file format
Laser Safety Level Class II
Adapter FC/UPC (Interchangeable SC adapter)
Language English, Spanish, Russian, French, Portuguese, Korean, Italian, Vietnamese
①Testing temperature is 25°C±2°C, maximum pulse width, average time is more than 3 minutes.
②Test conditions of Event Dead Zone are minimum range, minimum pulse width, reflection loss of optical fiber end surface (>45dB), typical value.
2. Optical Power Meter
Wavelength Range (±20nm) 800~1700nm
Calibrated Wavelength 850/1300/1310/1490/1550/1625/1650nm
Test Range Type A: -70~+10dBm (default);
Type B: -50~+26dBm (optional)
Resolution 0.01dB
Uncertainty ±5%
Connector Universal 2.5mm (FC/SC/ST)
3. Optical Light Source
Emitter Type FP-LD
Working Wavelength 1310/1550nm±20nm
Output Power ≥-5dBm
Modulation Frequency CW/270/1k/2kHz
Accuracy CW, ±0.5dB/15min (Test after 15 minutes of preheating)
Connector FC (Interchangeable SC adapter)

3.1. The wavelength of Optical Light Source is the same as OTDR wavelength.
3.2. Optical Light Source shares the same fiber port as OTDR port.

4. Visual Fault Locator
Wavelength (±20nm) 650nm
Power ≥10mW
Mode CW/2Hz
Connector Universal 2.5mm (FC/SC/ST)
5. RJ45 Sequene
Test Range 300m
Other Specification:
Display 4.3 inch full-view capacitive touch screen, support multi-touch, TFT 800×480 resolution
CPU Frequency 1GHz
Power Supply AC/DC adapter: AC: 100~240V, 50/60Hz, 9V, 2A; Lithium battery: 3.7V 5,200mAh
Battery Standby Life ≥10h
Battery Working Hours ≥8h (backlight off)
Battery Charging Time 3 hours with power adapter; 10 hours with USB cable
Data Interface 2×USB (Type A×1, Micro USB×1), SD card
Data Storage 100,000 curves; 1G DDR and 8G memory card
Weight 560g (including battery)
Size 175*105*45mm
Operating Temperature -10 ~ +55°C
Storage Temperature -20 ~ +80°C
Relative Humidity < 95% Non-condensation
Standard Accessories:
Item Name Quantity
1 OTDR with FC adapter for OTDR/LS port, Lithium battery and Simulation analysis software 1pc
2 AC/DC power adapter 1pc
3 Data line 1pc
4 SC Adapter for OTDR port 1pc
5 User manual 1pc
6 Calibration Certificate 1pc
7 Soft Bag with shoulder strap 1pc
8 Remote module for Network Cable Test 1pc
9 Wrist belt 1pc
Optional Accessories:
Item Name Quantity
1 LC Adapter for OTDR port 1pc
2 ST Adapter for OTDR port 1pc
Ordering Information:
Model MAY420
Wavelength and Dynamic Range D22: 1310/1550nm, 22/20dB
D24: 1310/1550nm, 24/22dB
D26: 1310/1550nm, 26/24dB
Power Meter A: -70~+10dBm (default)
B: -50~+26dBm
Connector None: FC/UPC and SC/UPC (default)

Note: OTDR’s outer housing color option: white or black.

MAY420 Mini OTDR - Main Page

Main Page

MAY420 Mini OTDR - OTDR Module

OTDR Module

MAY420 Mini OTDR - OPM Module

OPM Module

MAY420 Mini OTDR - VFL Module

VFL Module

MAY420 Mini OTDR - Laser Source Module

Laser Source Module

MAY420 Mini OTDR - Network Cable Test Module

Network Cable Test Module

MAY420 Mini OTDR - Event Map Module

Event Map Module

MAY420 Mini OTDR - Event Map Module for PLC Splitter

Event Map Module for PLC Splitter

MAY420 Mini OTDR - Loss Testing Module

Loss Testing Module

MAY420 Mini OTDR - Setting Module - Language

Setting Module – Language

MAY420 Mini OTDR - Files Module

Files Module

MAY420 Mini OTDR - Threshold Settings

Threshold Settings

MAY420 Mini OTDR - Splitter Loss Setting

Splitter Loss Setting

1. Manual