Minimum Computer System Requirements

Pentium 4 with a speed of 1.5 GHz, .5 GB RAM, 40 MB hard drive space, and Windows XP with Service Pack 2 is the minimum for Model DU2 systems (Model 7 and higher).

Power Requirements

Interfaces are powered by the USB port.

Underwater camera is powered by 8 AA batteries.

System Limitations

Sampling rate varies with the computer from about 50 to 100 samples/sec.
Maximum number of repetitions per trial is 100.
Maximum number of clients in database is 500.
Maximum allotted time for data collection in one trial is 5 min with 1-2 RSUs connected or 1.25 min with 3-8 RSUs at a sampling rate of 50 samples/sec.

Approximate File Sizes

Data files (.dat extension) require 12 KB with 1-2 RSUs connected and 48 KB with 3-8 RSUs for every 1 min. of data collected at a sampling rate of 50 samples/sec.
Summary files (.sum extension) require 1 KB with 1-2 RSUs connected and 4 KB with 3-8 RSUs for every 10 repetitions.

Video files (.avi extension) require about 30 MB for a 10 sec trial.

Standard Sensor Features

Model D sensors weigh 8 oz. and connect to the interface with a 50 ft. cable.

Model T transmitter unit with 2 sensors and 9v battery weighs 1 lb.

Sensor Dimensions/Installation Requirements

Type A sensors are 1.25 in. x .75 in. x 1 in.
Type B sensors are 2 in. x 1.5 in. x 1 in. and have a 24 in. x .75 in. rubber strap with a bayonet clip.
Type C sensors require a minimum space of 1.25 in. x .75 in. x .5 in. and are custom installed by STR.
Type D sensors are 1.25 in. x .75 in. x 1 in. and can be installed on any flat surface that has a maximum thickness of .75 in. Type D sensors have a .75 in. long mounting screw with wingnut and require two mounting holes with diameters of 3/16 in. and 5/16 in. that are centered .75 in. apart.

Sensor Performance (maximum values)

Sensors have an accuracy of .2%.
Series 25 sensors have a sensitivity of .4 lb./unit and a range of 1,000 lbs. positive to 95 lbs. negative.
Series 40 sensors have a sensitivity of .25 lb./unit and a range of 1,000 lbs. positive to 85 lbs. negative.
Series 80 sensors have a sensitivity of .125 lb./unit, and a range of 500 lbs. positive to 75 lbs. negative.