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ReacTime False Start Detection System

The ReacTime False Start Detection System captures reaction times and start data using internationally patented technology in sensor units attached to athlete starting blocks. The system is comprised of block sensors on each starting block, a command center and has an integrated Public Address system to facilitate clear transmission of the Starter's Commands to the athletes. During a start, the ReacTime technology relays athlete reaction data to the Command Center where it instantly analyzes starts in accordance with World Athletics rules every 1/1000th of a second. Reaction data is also transmitted to the ReacTime Championship Software where it can be viewed, graphed, and printed by meet officials right from the track. ReacTime integrates seamlessly with FinishLynx start and photo-finish data to create a powerful, World Athletics-approved results network at your venue—allowing you to capture events from start to finish.

ReacTime interfaces with FinishLynx results  for seamless integration of athlete data. The individual Block Sensors can also be used as a reaction training system. Unlike some simpler systems, ReacTime has no contact pads and the system cannot be tricked or overloaded. The system is rugged and easy-to-use. The battery or AC powered blocks are weather-resistant and designed to withstand the tough demands of a year-round athletics environment.

We offer many ReacTime package variations, including 6-Lane Wired (RT6L), 8-Lane Wired (RT8L), ReacTime Training Packages, and many custom variations for both larger and smaller venues.

  • Detects illegal reaction times and alerts the starter (USATF Rule 162.14 and World Athletics Technical Rule 16.6)
  • Measures reaction times to 1/1000th of a second
  • Detection sensors attach to most popular starting blocks
  • ReacTime Control Center is lightweight and portable
  • AC powered or battery-operated
  • Includes headset for the start official
  • ReacTime Software allows athlete waveform start data to be graphed, compared, saved, and printed
  • Loudspeakers attach to blocks to ensure athletes hear gun and start commands
  • Paper tape printer allows track-side printing

RT6L – Complete 6-lane ReacTime Wired False Start System – Contents”

  • 6 Block Sensors
  • 6 Block Mounted Speakers
  • 1 False Start Command Center
  • 6 Block Sensor Clamps
  • 1 Starter’s Headset
  • 1 ReacTime Line Printer
  • 6 Block Sensor Cables (5.5meter)
  • 1 Command Center Cable (30 meter)
  • 6 Block Sensor Cables (13meter)
  • 2 ReacTime System Cases
  • 1 ReacTime Power Supply & Charger
  • 2 Speaker Cases
  • 1 ReacTime Serial Cable
  • 1 USB to Serial Converter 1 Port
  • 1 ReacTime Signal Input Cable
  • 1 ReacTime Software License
  • 1 Normally Closed Start Sensor
  • 1 XLR-3 Start Cable – 100 foot

“In competitions held under paragraphs 1.1, 1.2, 1.3 and 1.6 of International Competition definition and for any performances submitted for ratification as a World Record under Rules 32 and 34 of the Competition Rules, the starting blocks shall be linked to to a World Athletics certified Start Information System. This system is strongly recommended for other competitions.

Note: In addition, an automatic recall system, within the Rules, may also be used.” –World Athletics TR15.3 (2020)

“When a World Athletics certified Start Information System is in use, the Start and/or an assigned Recaller shall wear headphones in order to clearly hear the acoustic signal emitted when the System indicates a possible false start (i.e. when the reactime time is less than 0.100 second). As soon as the Start and/or Recaller hears the acoustic signal, and if the gun was fired, there shall be a recall and the Starter shall immediately examine the reactime times and other available information from the Start Information System in order to confirm which, if any, athlete(s) is/are responsible for the recall.

Note: When a World Athletics certified Start Information System is in operation, the evidence of this equipment shall be used as a resource by the relevant officials to assist in making a correct decision.-World Athletics TR16.6 (2020)

ReacTime Datasheets
NameFile Size
ReacTime Product Datasheet664.1 KBDownload
ReacTime Manuals
NameFile Size
ReacTime Championship 2.02 Release Notes150.8 KBDownload
ReacTime Championship 2.00 Release Notes173.8 KBDownload
ReacTime 1.20 Manual 2.8 MBDownload
ReacTime Firmware 1.40 Release Notes340.4 KBDownload
ReacTime Firmware 2.00 Release Notes122.2 KBDownload
Spanish - ReacTime Software Manual Version 1.302.7 MBDownload
ReacTime Quick-Start Guides
NameFile Size
QSG - ReacTime Championship Setup2.4 MBDownload
QSG - ReacTime Official Starter Instructions12.6 KBDownload
QSG - ReacTime Recall Starter Instructions12.7 KBDownload
ReacTime Software
NameFile Size
ReacTime Championship Software 2.041.8 MBDownload
ReacTime Block Sensor Firmware 2.0028.6 KBDownload
ReacTime Command Center Firmware 2.0028.4 KBDownload
Spanish Language file for ReacTime Championship Software33.3 KBDownload