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The Laureate time interval transmitter can transmit pulse width or time delay between individual pulses to a resolution of 0.2 µs for periodic events. It can also transmit average pulse width or average time delay between multiple pulses.
Time interval is measured between inputs on channels A and B. Timing starts when a pulse is applied to Channel A (selectable positive or negative edge), and ends when a pulse is applied to Channel B (selectable positive or negative edge). In case of a single pulsed signal, the A and B inputs can be tied together. A positive or negative slope may be selected to start timing, and the opposite slope must be selected to stop timing. Timing is achieved by counting 5.5 MHz clock pulses. Multiple integral time intervals are averaged over a gate time which is selectable from 10 ms to 199.99 s and also controls the maximum output rate.
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 5V, 10V or 24V dc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.
Standard features of Laureate transmitters include:
Easy Transmitter programming is via Laurel's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL04).
| Pulse Input | |
|---|---|
| Types | AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups |
| Signal Ground | Common ground for channels A & B. |
| Minimum Signal | Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V). |
| Maximum Signal | 250 Vac |
| Maximum Frequency | 1 MHz, 30 kHz, 250 Hz (selectable). |
| Contact Debounce | 0, 3, 50 ms (selectable). |
| Time Base Accuracy | Quartz crystal calibrated to ±2 ppm. |
| Span Tempco | ±1 ppm/°C (typ) |
| Long-term Drift | ±5 ppm/year |
| Time Interval Mode | |
| Timing Start | Channel A pulse, + or - edges |
| Timing Stop | Channel B pulse, + or - edges |
| Update Rate | Gate time + 30 ms + 0-2 time intervals |
| Gate Time | Selectable 10 ms to 199.99 s |
| Time to Zero Output | Selectable 10 ms to 199.99 s |
| Resolution | |
| 0 - 199.999 s | 1 ms |
| 0 - 99.9999 s | 100 µs |
| 0 - 9.99999 s | 10 µs |
| 0 - .999999 s | 1 µs |
| 0 - .099999 s | 0.2 µs (after averaging) |
| Analog Output (standard) | |
| Output Levels | 4-20 mA, 0-20 mA, 0-10 Vdc, -10 to +10Vdc (user selectable) |
| Compliance at 20 mA | 10V (0-500Ω load) |
| Compliance at 10V | 2 mA (5 kΩ or higher load) |
| Output Resolution | 16 bits (65,536 steps) |
| Output Accuracy | ±0.02% of output span |
| Output Update Rate | Programmed gate time + 30 ms + 0-2 signal periods |
| Output Isolation | 250V rms working, 2.3 kV rms per 1 minute test |
| Serial Data Output (standard) | |
| Signal Types | RS232 or RS485 (half or full duplex), jumper selectable |
| Data Rates | 300, 600, 1200, 2400, 4800, 9600, 19200 baud |
| Output Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Serial Protocols | Modbus RTU, Modbus ASCII, Custom ASCII |
| Modbus Compliance | Modbus over Serial Line Specification V1.0 (2002) |
| RS232/485 Connector | Screw terminals for easy daisy chaining |
| Digital Addresses | 247 for Modbus, 31 for Custom ASCII |
| Dual Relay Output (standard) | |
| Relay Type | Two solid state relays, SPST, normally open, Form A |
| Load Rating | 120 mA at 140 Vac or 180 Vdc |
| Transducer Excitation Output (standard) | |
| Jumper Selection 1 | 10V @ 60 mA, isolated to 50V from signal ground |
| Jumper Selection 2 | 5V @ 50 mA, isolated to 50V from signal ground |
| Jumper Selection 3 | 15V @ 60 mA, non-isolated |
| Power Input | |
| Standard Power | 85-264 Vac or 90-300 Vdc |
| Low Power Option | 10-48 Vdc or 12-32 Vac |
| Power Frequency | DC or 47-63 Hz |
| Power Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Power Consumption at 24V | 1.5W typical, 3W with max excitation output |
| Mechanical | |
| Dimensions | 129 x 104 x 22.5 mm case |
| Mounting | 35 mm rail per DIN EN 50022 |
| Electrical Connections | Plug-in screw-clamp connectors |
| Environmental | |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 95% at 40°C, non-condensing |
| Cooling Required | Mount transmitters with ventilation holes at top and bottom. Leave 6 mm (1/4") between transmitters, or force air with a fan. |
| Time Interval Mode for Time Delay | |
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For periodic pulses applied to A and B channels, time delays can be measured down to 0.2 µs resolution from the rising or falling edge of A to the rising or falling edge of B (selectable). |
| Time Interval Mode for Pulse Width | |
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The width of periodic pulses (t1 or t2) can be measured by tying the A and B channels together. As for time delay, readings are averaged over a user-selectable gate time. |
| Timing Process Dynamics with two Meters or Transmitters | |
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The start and stop pulses used for timing can be generated by the dual relay board in a Laureate panel meter, counter or transmitter. For instance, the start and stop pulse edges can be created as temperature passes two alarm setpoints, or temperature cycles in a hysteresis control mode. |
| Replacing an Oscilloscope with a Laureate Time Interval Meter or Transmitter | |
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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 or transmitter will be the instrument of choice. Resolution to 0.2 µs is feasible. |
| Instrumenting a Pulsed Laser System | |
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Some of the many possibilities in instrumenting a pulsed laser system with Laureate dual-channel counters and transmitters: elapsed time, number of pulses, pulse width, pulse separation, duty cycle, and pulse rep rate. |
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