Datasheet

Page 10

Web: www.maxbotix.com

PD11500c

MaxBotix

Inc.

Patent 7,679,996

HRXL-MaxSonar

WR/WRC

™

Series

MaxBotix Inc., products are engineered and assembled in the USA.

Operations and Timing Continued

Sensor Operation: Free-Run

When operating in free run mode, the HRXL-MaxSonar-WR sensors are designed to be used in a variety of outdoor,

industrial, or indoor environments. Many acoustic noise sources will have little to no effect on the reported range of the

HRXL-MaxSonar-WR sensors

. Most range readings are accurately reported

. If the range readings are affected, the effect

is typically less than 5-mm

. This allows users to employ real-time ultrasonic distance sensing without the need for

additional supporting circuitry or complicated user software.

Filtered Operation: Free-Run

The HRXL-MaxSonar-WR use an internal bandwidth filter to process range data. This filter improves the sensor’s

performance for accuracy, noise rejection, and reading to reading stability. The filtering in the free-run operation also

permits additional acoustic and electrical noise tolerance.

On the HRXL-MaxSonar-WR sensors (MB7360, MB7367, MB7380, MB7387) when pin 4 is left high, the sensor will

continue to range every 133mS (7.5Hz read rate), the data output includes a 1.5Hz filter. The HRXL-MaxSonar-WR

sensors will output the range based on recent range information. The filter does not affect the speed at which data is made

available to the user but instead allows for more consistent range information to be presented.

On the HRXL-MaxSonar-WRM sensors (MB7369, MB7389) when pin 4 is left high, the sensor will continue to range

every 148mS (6.67Hz read rate), the data output includes a 1.33Hz filter. The HRXL-MaxSonar-WRM sensors will

output the range based on recent range information. The filter does not affect the speed at which data is made available to

the user but instead allows for more consistent range information to be presented.

Notes:

Refer to section that compares WR to WRC on page 11