Laureate™ Stopwatch Timers
Resolution to 0.2 µs for time measurement of single events
  

• 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.
• Isolated 5, 10 or 24 Vdc excitation output to power sensors.
• NEMA 4X, 1/8 DIN case
• Dual relay option
• Analog output option
• Serial communication options
• Low voltage AC & DC power
• Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS.

Stopwatch Mode

The Laureate 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. For long intervals, the display is updated continuously during timing.

• 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.

Timing is achieved by counting 5.5 MHz clock pulses. Laureate™ stopwatch timers use the FR dual-channel signal conditioner and Standard counter main board.

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.

Universal Signal Conditioner

The dual-channel signal conditioner used for pulse detection 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.

Other Features and Options

Plug-in isolated analog output, dual setpoint controller, or RS232/485 serial data I/O boards can upgrade the Laureate from a stand-alone monitor to system interface and control. The 1/8 DIN case of Laureate meters and counters meets NEMA 4X (IP-65) standards from the front for high pressure wash-down when panel mounted.

AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups.
Common ground for channels A & B
Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V).
250 Vac
1 MHz, 30 kHz, 250 Hz (selectable)
0, 3, 50 ms (selectable)

Timing Modes:
    With CH A only
    With CH A tied to CH B
    With CH A and CH B
   
Timing Interval
Timing Resolution
Selectable Decimal Time
Selectable Clock Time
Output & Display Update
Gate Time

  
+ to + edge, or - to - edge.
+ to - edge, or - to + edge.
+ edge of A to + edge of B, + edge of A to - edge of B,
- edge to A to - edge of B, - edge of A to - edge of B
1 µs to 999,999 hrs
0.2 µs to 1 hr
999999 H, M or S format with decimal point
HH.MM.SS format
Gate time + 30 ms 
Programmable from 10 ms to 199.99 s

Crystal calibrated to ±2 ppm
±1 ppm/°C (typ)
±5 ppm/year

Stopwatch Mode

The stopwatch mode is used to time single events between start and stop pulses on the same channel. Duration of a single wave shape can be measured by tying the A and B channels together.

Timing Process Dynamics

The start and stop pulses used for timing can be generated by the dual relay board in a Laureate analog panel meter or digital counter. For instance, the start and stop pulse edges can be created as temperature passes two alarm setpoints, or astemperature cycles in a hysteresis control mode.

Replacing an Oscilloscope with a Laureate Meter

An oscilloscope is great for viewing and timing pulses in a lab. However, in fixed installations where digital timing accuracy and control outputs are required, a low-cost Laureate time interval meter will be the instrument of choice. Resolution to 0.2 µs is feasible.

Some of the many possibilities in instrumenting a pulsed laser system with Laureate dual-channel counters: elapsed time, number of pulses, pulse width, pulse separation, duty cycle, and pulse rep rate.