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Ultra-Economy OTDR

TB-620 OTDR is an entry level handheld, portable OTDR with a 3.2inch color LCD mainly used in CATV networks to help technicians measure the fiber length and attenuation loss. 

Dual wavelength capability: TB-620 OTDR is available in Single mode, two wavelength options of 1310/1550 nm and is provided with a very capable user friendly OTDR simulation software which shows details of events.

TB-620 OTDR is an ultra-economy OTDR with built in Optical Power Meter with Range C: +26~-50dBm for cable tv users and Visual fault locator 1mW as standard feature.

Product Specification

Dynamic Range



± 0.2 dB

Wavelength (nm)


Pulse Width



3.2 inch LCD

Event Dead Zone (EDZ)


Attenuation Dead Zone (ADZ)


Distance Accuracy


Visual Fault Locator

1mW (0 dBm)

Optical Power Meter (OPM)

Range: +26~-50dBm

Connector Adaptor *

FC/UPC, SC/UPC (Optional: APC interchangeable adaptors)

Data Storage

Internal memory or Micro SD card (optional)

Communication Interface

Micro USB

Size (mm)

168 x 95 x 38

Weight (g)


Storage / Operating Temperature/

Relative Humidity

0°C to ~ 50°C/ -20°C to ~+70°C/ <90% RH

Power Supply Operating Time

3.7V 2400mAh lithium polymer battery

Standard Accessories

Carrying bag, AC/DC adaptor, USB cable, calibration certificate, manual, (FC/UPC or

SC/UPC) connector (connector to be specified at time of ordering)

Optional Accessories

APC adaptor

  • Built-in VFL and OPM
  • 3.2 inch color LCD
  • Automatic one-button test
  • Handheld design, light weight and portable
  • Automatic detection and protection of input light
  • OTDR software provides detailed test reports
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