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The Laureate A-to-B Time Interval Meter can display pulse width or time delay between individual pulses to a resolution of 0.2 µs. It can also display 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 display update time.
Time interval can be displayed in seconds, milliseconds, or microseconds with 6-digit resolution. In the typical application, time is displayed in milliseconds with 1 µs resolution. For times less than 100 ms, display resolution down to 0.2 µs can be achieved by applying a multiplier of 10, moving the decimal point by one position, and averaging many time intervals.
Highly accurate rate can be displayed by taking the inverse of time. Extensive arithmetic capabilities allow display in engineering units, such as meters/sec. An Extended main board version offers all features of Standard main board plus rate based on 1/time.
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. 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.
Designed for system use. Optional plug-in boards for communications and control include Ethernet, WiFi and serial communication boards, dual or quad relay boards, and an isolated analog output board. 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. A built-in isolated 5, 10, or 24 Vdc excitation supply can power transducers and eliminate the need for an external power supply. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.
| Display | |
|---|---|
| Readout | 6 LED digits, 7-segment, 14.2 mm (.56"), red or green. |
| Range | -999999 to +999999 |
| Indicators | Four LED lamps |
| Inputs | |
| Types | AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups. |
| Signal Ground | Common ground for channels A & B |
| Channel A Freq. | 0 Hz to 1 MHz |
| Channel B Freq. | 0 Hz to 250 kHz |
| Minimum Signal | Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V). |
| Maximum Signal | 250 Vac |
| Noise Filter | 1 MHz, 30 kHz, 250 Hz (selectable) |
| Time Interval Mode | |
| Timing Start | Channel A pulse, + or - edges |
| Timing Stop | Channel B pulse, + or - edges |
| Periodic Timing Interval | Gate time + 30 ms + 0-2 time intervals |
| Gate Time | Selectable 10 ms to 199.99 s |
| Time Before Zero Output | Selectable 10 ms to 199.99 s |
| Resolution | |
| 0 - 199.999 s | 1 ms |
| 0 - 99.9999 s | 100µs |
| 0 - 9.99999 s | 10 µs |
| 0 - .999999 s | 1 µs |
| 0 - .099999 s | 0.2 µs |
| Accuracy | |
| Time Base | Crystal calibrated to ±2 ppm |
| Span Tempco | ±1 ppm/°C (typ) |
| Long-term Drift | ±5 ppm/year | Maximum Signal |
| Max applied voltage | 600 Vac for 20, 200 and 300 V ranges, 125 Vac for other ranges |
| Current protection | 25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5 A |
| Power Supply Boards (one required) | |
| Voltage, standard | 85-264 Vac or 90-300 Vdc |
| Voltage, optional | 12-32 Vac or 10-48 Vdc |
| Frequency | DC or 47-63 Hz |
| Power consumption | 1.2W @ 120 Vac, 1.5W @ 240 Vac, 1.3W @ 10 Vdc, 1.4W @ 20 Vdc, 1.55W @ 30 Vdc, 1.8W @ 40 Vdc, 2.15W @ 48 Vdc (typical, base meter) |
| Power Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Excitation Output (standard) | |
| 5 Vdc | 5 Vdc ± 5%, 100 mA |
| 10 Vdc | 10 Vdc ± 5%, 120 mA |
| 24 Vdc | 24 Vdc ± 5%, 50 mA |
| Output Isolation | 50 Vdc to meter ground |
| Analog Output Boards (one optional) | |
| Output levels | 4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable) |
| 4-20 mA, 0-20 mA, 0-10V (dual-output option) | |
| Current compliance | 2 mA at 10V ( > 5 kΩ load) |
| Voltage compliance | 12V at 20 mA (< 600 Ω load) |
| Scaling | Zero and full scale adjustable from -99999 to +99999 |
| Resolution | 16 bits (0.0015% of full scale) |
| Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Relay Output Boards (one optional) | |
| Dual magnetic relays | 2 Form C, 8A at 250 Vac or 24 Vdc, 0.3A at 250 Vdc, resistive load |
| Quad magnetic relays | 4 Form A (NO), 8A at 250 Vac or 24 Vdc, 0.3A at 250 Vdc, resistive load |
| Dual solid state relays | 2 Form A (NO), 120 mA at 140 Vac or 180 Vdc, resistive load |
| Quad solid state relays | 4 Form A (NO), 120 mA at 140 Vac or 180 Vdc, resistive load |
| Relay commons | Isolated commons for dual relays or each pair of quad relays |
| Relay isolation | 250V rms working, 2.3 kV rms per 1 minute test |
| Relay latching modes | Latching or non-latching |
| Relay active modes | Active on or off, active high or low |
| Hysteresis modes | QA passband mode, split hysteresis, span hysteresis |
| Communication Boards (one optional) | |
| Board selections | RS232, RS485 with dual RJ11 connectors, RS485 with dual RJ45 connectors, USB, Ethernet, USB-to-RS485 gateway, Ethernet-to-RS485 gateway, WiFi with built-in antenna plus USB & RS485, WiFi with external antenna plus USB & RS485 |
| Protocols | Laurel Custom ASCII (serial), Modbus RTU (serial), Modbus TCP (Ethernet or WiFi) |
| Digital addresses | 247 (Modbus), 31 (Laurel ASCII), |
| Isolation | 250V rms working, 2.3 kV rms per 1 min test |
| Environmental | |
| Operating temperature | 0°C to 55°C |
| Storage temperature. | -40°C to 85°C |
| Relative humidity | 95% at 40°C, non-condensing |
| Protection | NEMA-4X (IP-65) when panel mounted |
| Signal Connections | |
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| 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 a Panel Meter and Time Interval Meter | |
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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 or digital counter. 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. |
| Rate Based on 1 / Time | |
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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 Time Interval Meter | |
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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 will be the instrument of choice. Resolution to 0.2 µs is feasible. |
| Instrumenting a Pulsed Laser System Using Laureate Counters | |
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| Some of the many possibilities in instrumenting a pulsed laser system with Laureate dual-channel counters. | |
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