1. 4.3-inch HD touch screen
  2. Measure distance as short as 2 meters
  3. Event Dead Zone: 2.5m; Attenuation Dead Zone: 8m
  4. 1 m resolution for accurate mapping of event
  5. Support multi-result analysis
  • fiber attenuation by least square method
  • fiber attenuation by two point method
  • results corresponding to segments
  • interface screen shot for any display
  1. Cover full range of user interface
  • USB A Type
  • Micro-USB,
  • SanDisk
  1. Ultra-High Capacity Battery that enables continuous use in the wild and support charge with portable power bank
  2. Support peripherals like mouse and keyboard ( For simultaneous use, please expand with USB HUB)
  3. Support both horizontal and vertical displays
  4. Support RJ45 cable test

ATO-B1 OTDR is used in the installation and maintenance of fiber optic cables. Acuteq OTDR has the advantage of high precision test capabilities, fast response time and easy to learn to operate. The ATO-B1 Series offers accurate and fast results and creates a report automatically.

General Specification
Display 4.3 inch HD (touch screen)
Battery 3.7 V/4000mAh X 1 lithium battery

Continuously test: > 8 hours (back light off)

Charging time: 3 hours with adapter; 10 hours with USB

Data Storage 20,000 groups of curves
Interface USB Type C×1, 8GB SanDisk
Working Temp -10℃~+50℃
Storage Temp -20℃~+70℃
Humidity ≤95% (non-condensation)
Accessories Main unit, 12V power adapter, Lithium battery, FC adapter, USB cord, User guide, RJ45 Cable Tracker, carrying case, wrist belt,
Dimension 5.8× 3.8×1.6 inches/ 1.1 pounds (battery included)

173×110×46 mm/ 0.5 kg (battery included)

Test parameter


Dynamic Range

Model Dynamic Range and Wavelength Event Dead Zone Attenuation

Dead Zone

ATO-A1-S24 24 dB @1550nm 2.5 8
ATO-A1-S26F 26 dB @1310nm

Suitable for Live test @ 1490/1550nm (Power ≤-5dBm)

2.5 8
ATO-A1-S24F 24 dB @1550nm

Suitable for Live test @ 1310/1490nm (power ≤-5dBm)

2.5 8
ATO-A1-D26 24/22 dB @1310/1550nm 2.5 8
Testing Distance 80km (Depends on cable layout)
Sampling Resolution Minimum 0.05 m
Sampling Point Maximum 64,000 points
Linearity ≤0.05dB/dB
Loss Threshold 0.2dB
Loss Resolution 0.001dB
Distance Resolution 0.01m
Distance Accuracy ±(1m+measuring distance×5×10-5+sampling resolution)

(excluding IOR uncertainty)

Refraction Setting 1.2000~2.0000, 0.0001 step
List of Optional Modules
Modules Parameter Note
VFL Module Optional between 1-20mW Default: 10mW
OPM Module Type A:+10dBm~-70dBm; Type A as default choice
Type B:+26dBm~-50dBm
LS Module Output:-5dBm±2dB N0 LS Module for Mutil-mode
Output Mode:CW/270Hz/1KHz/2KHz
RJ45 Cable Tracker Digital tracking



①Dynamic range is measured with maximum pulse width, averaging time is 3 minutes, SNR=1; The level difference between the RMS noise level and the level where near end back-scattering occurs.


②Event dead zone is measured with pulse width of 3ns; attenuation dead zone is measured with pulse width of 5ns.