Optional plug-inīoards for communications and control include Ethernet, WiFi and serial communication boards, dual or quad relay boards, and an isolated analog output board. In a selectable Auto filter mode, the filter time constant is automatically selected based on detected signal noise.ĭesigned for system use. When a significant change in signal level occurs, that filter adapts by briefly switching to the shortest time constant to follow the change, then reverts back to the selected time constant. A built-in isolated 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.ĭigital filtering is selectable for electrically noisy environments, including a batch averaging filter and an adaptive moving average filter which provides a choice of 8 time constants from 80 ms to 9.6 s. Jumper selections provide optimum operation for different sensor types and noise conditions. The FR dual-channel signal conditioner board accepts inputs from proximity switches with a PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and other signals from 12 mV to 250 Vac. Accumulated time from multiple events (Item #2) is also tracked and may be displayed up to 999,999 hours. It is reset to zero when the next start pulse occurs. The stopwatch display is updated during timing at a rate controlled by a gate time, up to 25/s. The event time may also be displayed in HH.MM.SS clock format with 1 s resolution. The longest single-event timing interval is 999,999 hours. The event time (Item #1) may be displayed as a decimal number with six-digit resolution. This mode requires use of an Extended counter.ĭisplay. Extensive arithmetic capabilities allow display in engineering units, such as meter/sec. Rate Based on 1/Time Mode. Highly accurate rate can be displayed by taking the inverse of time.In addition, the A and B inputs can be tied together to start the stopwatch with one polarity and stop it with the other polarity. This mode allows inputs from different sources. Time can also be measured between a start pulse on Channel A (positive or negative edge) and a stop pulse on Channel B (positive or negative edge). Time can be measured between a start pulse and a stop pulse, both on Channel A, from either the positive or negative edges. A built-in isolated 5, 10, or 24 Vdc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply. The FR dual-channel signal conditioner board accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and other signals from 12 mV to 250 Vac. Serial Input Displays & Serial to Analog Converters.Stopwatch functions may also be available on wristwatches, cell phones, computers, and other electronic devices. Large digital stopwatches found in sports stadiums and that can be seen from a distance are called stopclocks. Certified timepieces can then be used to calibrate other devices for everyday use. Some have more than one timing channel and can be used to simultaneously measure the time for more than a single activity.Īll stopwatches and timers can be calibrated and certified based on standards traceable to the National Institute of Standards and Testing (NIST). Some stopwatches count by centiseconds (1/100 of a second), which is not to be confused with milliseconds.ĭigital timers are now available with a number of useful features. Digital stopwatches and timers are usually powered by a silver cell or lithium battery.ĭigital electronic stopwatches or timers have crystal oscillator timing elements that make them much more accurate than mechanical versions. Mechanical stopwatches are spring-powered and have to be wound periodically.
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