Laurel Digital Stopwatch & Timer

The Laurel stopwatch meter is designed to time single events, such as sporting events or processes, which produce start and stop pulses. It can also time the width of a single pulse. Highest resolution is 0.2 µs, since timing is achieved by counting 5.5 MHz clock pulses. For long intervals, the display is updated continuously during timing. Laureate™ stopwatch timers use the FR dual-channel signal conditioner and Standard counter main board.

• A-A Stopwatch Mode. Time can be measured between a start pulse and a stop pulse, both on Channel A, from either the positive or negative edges.
• A-B Stopwatch Mode. 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). This mode allows inputs from different sources. 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.
• Rate Based on 1/Time Mode. Highly accurate rate can be displayed by taking the inverse of time. Extensive arithmetic capabilities allow display in engineering units, such as meter/sec. This mode requires use of an Extended counter.

Display. The event time (Item #1) may be displayed H, M or S format with six-digit resolution. The longest single-event timing interval is 999,999 hours. The highest resolution is 0.2 µs. The event time may also be displayed in HH.MM.SS clock format with 1 s resolution. The stopwatch display is updated during timing at a rate controlled by a gate time, up to 25/s. It is reset to zero when the next start pulse occurs. Accumulated time from multiple events (Item #2) is also tracked and may be displayed up to 999,999 hours.

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. Jumper selections provide optimum operation for different sensor types and noise conditions. 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.

• Times single events from 1 µs to 999,999 hrs
• Timing resolution to 0.2 µs
• Selectable display of single event time or accumulated time of all events
• 6-digit red or green LED display
• Selectable H, M or S decimal format
• Selectable HH.MM.SS clock format
• Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac
• Triggers on positive or negative pulse edges
• External controls for reset, meter hold and decimal points
• Isolated 5, 10 or 24 Vdc excitation output to power sensors
• Universal AC power, 85-264 Vac
• NEMA 4X, 1/8 DIN case

• All capabilities of Standard Timer, plus rate based on 1/time.

• Serial communications: Ethernet Interface, Ethernet-to-RS485 server, USB Interface, USB-to-RS485 server, RS485 interface (dual RF11), RS485 Modbus interface (dual RJ45), RS232 interface.
• Low voltage power: 10-48 Vdc or 12-32 Vac
• Relay outputs: 2 or 4 relays, contact or solid state
• Analog output: isolated 4-20 mA, 0-20 mA, 0-10V, -10 to +10V