Laureate™ Digital Stopwatch & Timer

Resolution to 0.2 µs for time measurement of single or cumulative events. Displays highly accurate rate based on 1 / time.
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Stopwatch to time industrial processes
  • Times single or cumulative events from 1µs to 999,999 hrs
  • Timing resolution to 0.2 µs
  • Selectable HH.MM.SS clock forma or H, M or S decimal 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
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
  • Transducer excitation output (isolated)
  • Wide choice of options:
    - 2 or 4 relays, mechanical or solid state (isolated)
    - 1 or 2 analog outputs (isolated)
    - Serial data I/O: Ethernet, USB, RS485, RS232 (isolated)
Stopwatch Timer

Electronic timer 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, 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 as a decimal number 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.

Electronic Timer for Signal conditionerThe 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.

Digital 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. 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. In a selectable Auto filter mode, the filter time constant is automatically selected based on detected signal noise.

Designed for system use. Optional plug-in boards for communications and control include Ethernet and other serial communication boards, dual or quad relay boards, and single or dual isolated analog output boards. Laureates may be powered from 85-264 Vac or optionally from 12-32 Vac or 10-48 Vdc. The display is available with red or green LEDs. The 1/8 DIN case meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys can be locked out for simplified usage and security. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.

Applications Back to top
Stopwatch Mode
Electronic Timer - 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
Electronic Timer - 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 as temperature cycles in a hysteresis control mode.
Rate Based on 1 / Time
The Extended stopwatch meter can be programmed to display highly accurate rate based on elapsed time. A pulse or switch closure can initiate timing, while another pulse or switch closure stops timing. The meter can be programmed with multipliers to display rate in appropriate engineering units, such as meters/sec, for any time duration.
Replacing an Oscilloscope with a Laureate Meter
Electronic Timer - 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.
Instrumenting a Pulsed Laser System
Electronic Timer - Instrumenting a Pulsed Laser System

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.

Specifications Back to top
6 LED digits, 7-segment, 14.2 mm (.56"), red or green
-999999 to +999999
Four LED lamps

Minimum Signal
Maximum Signal
Noise Filter
Contact Debounce
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)
Stopwatch Mode
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

+ 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
30 ms + programmable from 10 ms to 199.99 s
Time Base
Span Tempco
Long-term Drift
Crystal calibrated to ±2 ppm
±1 ppm/°C (typ)
±5 ppm/year
Voltage, standard
Voltage, optional
Power Isolation
85-264 Vac or 90-300 Vdc (DC operation not ETL certified)
12-32 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
Excitation Output (standard)
5 Vdc
10 Vdc
24 Vdc
Output Isolation
5 Vdc ± 5%, 100 mA
10 Vdc ± 5%, 120 mA
24 Vdc ± 5%, 50 mA
50 Vdc to meter ground
Analog Output (optional)
Output Levels

Current compliance
Voltage compliance
4-20 mA, 0-20 mA, 0-10V, -10 to +10V (single-output option)
4-20 mA, 0-20 mA, 0-10V (dual-output option)
2 mA at 10V ( > 5 kΩ load)
12V at 20 mA ( < 600Ω load)
Zero and full scale adjustable from -99999 to +99999
16 bits (0.0015% of full scale)
250V rms working, 2.3 kV rms per 1 min test
(dual analog outputs share the same ground)
Relay Outputs (optional)
Relay Types

Current Ratings

Output common
2 Form C contact relays or 4 Form A contact relays (NO)
2 or 4 Form A, AC/DC solid state relays (NO)
8A at 250 Vac or 24 Vdc for contact relays
120 mA at 140 Vac or 180 Vdc for solid state relays
Isolated commons for dual relays or each pair of quad relays
250V rms working, 2.3 kV rms per 1 min test
Serial Data I/O (optional)
Board Selections

Data Rates
Digital Addresses
EthernetEthernet-to-RS485 serverUSBUSB-to-RS485 server, RS485 (dual RJ11), RS485 Modbus (dual RJ45), RS232
Modbus RTU, Modbus ASCII, Laurel ASCII protocol
300 to 19200 baud
247 (Modbus), 31 (Laurel ASCII), 
250V rms working, 2.3 kV rms per 1 min test
Operating Temperature
Storage Temperature
Relative Humidity
0°C to 55°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
Electrical Connections
Pinout diagram of Electronic Timer
Ordering Guide Back to top
Laureate™ Stopwatch Meters
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide). Prices are in US dollars and do not include shipping or duty charges (export sales).
Please see our explanations and limitations applicable to pricing and online orders Prices shown are in US Dollars and are Laurel's manufacturer's suggested retail price (MSRP) in the USA. Orders are processed manually, not directly by our shopping cart system. You don't have to supply credit card information when placing an online order.

North American Orders. Laurel does not sell factory-direct in the USA or Canada. Online sales orders are filled through distribution. During the ordering process, you will have the chance to select an authorized Laurel distributor, or you can ask Laurel to refer you to a distributor. The distributor will then contact you to quote shipping, tax and duty (where applicable), and arrange for payment.

International Orders. If your ship-to address indicates that you are outside of the USA or Canada and Laurel has a distributor in your country, we will forward your order to that distributor for follow-up. If Laurel does not have a distributor in your country, we will email you an order acknowledgment and a pro forma invoice which states the product price, shipping charges, and wire transfer information, which includes a $25 bank wire transfer fee.

Questions about your order? Please email your distributor or

Configured model number L50000FR
Configured price per model $240
Quantity 1
Extended price $240
L5 Standard Counter Main Board, Green LEDs
L6 Standard Counter Main Board, Red LEDs
L7 Extended Main Board, Green LEDs
L8 Extended Main Board, Red LEDs
With Standard Counter Main Board: Scalable to ±999,999 for frequency, rate, square root of rate, up or down total, period, stopwtch timing, average time interval of periodic events.
With Extended Main Board: Above, plus rate and total simultaneously, dynamic up-down counting, arithemetic functions applicable to channels A & B (A+B, A-B, A/B, AxB, A/B-1), phase angle, power factor, duty cycle, batch control, custom curve linearization.
0 Isolated 85-264 Vac or 90-300 Vdc
1 Isolated 12-32 Vac or 10-48 Vdc
0 None
1 Two 8A Contact Relays
2 Two 120 mA Solid State Relays
3 Four 8A Contact Relays
4 Four 120 mA Solid State Relays
0 None
1 Single isolated 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
2 Dual isolated 4-20 mA, 0-20 mA, 0-10V
Data I/O
0 None
1 RS-232
2 RS485 (dual RJ11 connectors)
4 RS485 (dual RJ45 connectors)
6 USB-to-RS485 converter
7 Ethernet
8 Ethernet-to-RS485 converter
FR Dual-Channel Pulse Input Signal Conditioner.
CBL01   RS232 cable, RJ11 to DB9, 7 ft. Connects RS232 ports of meter
and PC.
CBL02 USB to RS232 adapter cable. Combination of CBL02 and CBL01
connects meter RS232 port to PC USB port. Combination of CBL02 and
CBL04 connects transmitter RS232 terminals to PC USB port.
CBL03-1 6-wire data cable, RJ11 to RJ11, 1 ft. Used to daisy chain meters
via RS485.
CBL03-7 6-wire data cable, RJ11 to RJ11, 7 ft. Used to daisy chain meters
via RS485.
CBL05  USB cable, A-B. Connects USB ports of meter and PC.
CBL06  USB to RS485 adapter cable, half duplex, RJ11 to USB. Connects
meter RS485 port to PC USB port.
NL  Meter Lens with Button Pads but no Laurels Logo
BL  Meter Lens without Button Pads or Laurels Logo
IPC  Splash-proof Cover
BOX1  NEMA-4 Enclosure
BOX2  NEMA-4 Enclosure plus IPC

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