Laureate™ Phase Angle & Duty Cycle Meter

(For offset in degrees & On or Off period in percent)
Common Features
  • Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac.
  • Frequency from .005 Hz to 10 kHz.
  • Isolated 5, 10 or 24 Vdc excitation output to power sensors.
  • Uses Standard counter main board and FR signal conditioner.
  • Certified to UL 3101-1, CAN/CSA-C22.2, EN 61010-1 (CE Mark).
  • Trigger on positive or negative pulse edges.
  • 6-digit red or green LED display.
  • NEMA 4X (IP-65) front panel, 1/8 DIN case.
  • Optional dual relays, 4-20 mA & 0-10 V analog output, RS-232/485, and parallel BCD output.
Phase Angle Mode
  • Measures phase angle between two waveshapes of similar period
  • .01% accuracy at AC line frequency
  • Resolution of 1°, 0.1° or 0.01°.
  • -----------
Duty Cycle Mode
  • Measures ON or OFF period as a percentage of total period.
  • Resolution of 1%, 0.1% or 0.01%.
The Laureate™ phase angle and duty cycle meters both use the FR dual-channel signal conditioner board and the Extended counter main board.
Phase Angle Mode
Phase angle measurement requires that two signals with identical periods be applied to Channels A and B. A display from -180º to +180º is obtained by timing the rising edge of one channel and the falling edge of the other channel, and programming a 180º offset. A resolution of 1º, 0.1º or 0.01º is selectable. Accuracy is 0.01% up to 100 Hz, 0.1% at 1 kHz, and 1% at 10 kHz

Phase angle measurement is commonly used with AC power from 50 Hz to 400 Hz. Phase angle needs to be set to zero to synchronize AC generators. It also applies to the triggering of SCRs and Triacs for power control. The phase angle between AC current and voltage determines power factor. The Laureate phase angle meter provides exceptionally fast response and six-digit accuracy for low frequencies, such as AC line frequency.

Phase angle is determined by timing crystal clock pulses over a specified gate time which is selectable from 10 ms to 199.99 s. By selecting the minimum gate time of 10 ms, the update rate can be up to 20/s for 50/60 Hz AC line frequency. Improved accuracy is obtained by making the gate time long enough so that multiple cycles can be averaged.
Duty Cycle Mode
Duty cycle is a measure of ON or OFF period as a percentage of total period. As for phase angle, duty cycle is determined by averaging an integral number of periods over a gate time which is selectable from 10 ms to 199.99 s. The same signal is applied to Channels A and B. The meter divides the average pulse width by the period between pulses and expresses this ratio in percent. A resolution of 1%, 0.1% or 0.01% is selectable. By selecting leading or falling pulse edges, the ON or OFF duty cycle can be displayed.

Duty cycle measurement is used to monitor modulated proportional control systems and pulse-modulated systems, such as radar, lasers or packet radio. For long periods, duty cycle can be measured by using the A and B channels of the Laureate dual-channel counter to totalize AC line cycles and having the counter display the ratio of the two totals scaled to percent.

Universal Signal Conditioner
The dual-channel signal conditioner accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and AC signals from 12 mV to 250 Vac. Nine hysteresis and signal levels are jumper selectable for reliable triggering. A 1600 Hz low-pass rolloff filter for noise reduction and contact debounce times of 3 ms or 50 ms are also selectable

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 & Options
Plug-in isolated analog output, dual setpoint controller and RS232/485 communi- cations or BCD output boards can upgrade a Laureate from a stand-alone monitor to system interface and control. Laureate meters and counters meet NEMA 4X (IP-65) standards from the front for high pressure washdown when panel mounted.


Phase Angle Mode Duty Cycle Mode
Item Displayed Phase angle difference between two waves of same period Item Displayed
ON or OFF duty cycle of periodic pulse waveshape
Display Units 1°, 0.1°, 0.01° Display Units 1%, 0.1%, 0.01%
Frequency Range .005 Hz to 10 kHz Frequency Range .005 Hz to 50 kHz
Accuracy 01°, .005 Hz to 100 Hz, .1° at 1 kHz, 1° at 10 kHz Accuracy .01%, .005 Hz to 500 Hz, .1% at 5 kHz, 1% at 50 kHz
Maximum Timing Interval 200 s Maximum Timing Interval 200 s
Display Excitation Output
Readout 6 digits, 7-segment, 14.2 mm (.56") 5 Vdc 5 Vdc ±5%, 100 mA max
Color Red or green LED 10 Vdc 10 Vdc ±5%, 120 mA max
Range -99999 to +99999  24 Vdc 24 Vdc ±5%, 50 mA max
Indicators  4 red LED lamps Output isolation 50 Vdc to meter ground
Electrical Connections
Environmental Power
Operating Temperature 0°C to 55°C Voltage, std. 85-264 Vac and 90-370 Vdc
Storage Temperature -40°C to 85°C Frequency
DC or 49-440 Hz
Relative Humidity  95% at 40°C, non-condensing Voltage, opt. 8-28 Vac and 9-37 Vdc
Protection NEMA-4X (IP-65) when panel mounted Power isolation Safety-rated to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test
Types AC, pulses from NPN, PNP transistors, contact closures, magnetic pickups Selectable Hysteresis (-12 mV to +12 mV), (+30 mV to +60 mV),
(-30 mV to -20 mV), (-150 mV to +150 mV),
(+350 mV to +600 mV), (-600 mV to -350 mV),
(-1.15 V to +1.15 V), (+1.25 V to +2.1 V),
Signal ground Common ground for channels A & B
Debounce Time Selectable, none or 1600 Hz
Selectable 0, 3, 50 ms
Rolloff Filter (-2.1 V to -1.25 V)
Timing Interval
Periodic Timing Interval Gate time + 30 ms + 0-2 signal periods
Gate Time Selectable 10 ms to 199.99 s
Timeout Selectable 10 ms to 199.99 s
Output & Display Update Same as period timing interval

Typical Applications

Phase Angle Mode
Phase angle indicates the lead or lag in degrees from 0º to 360º between two periodic signals having the same frequency. In the illustration, phase angle is 360*P1/P. The signals are applied to the A and B input channels
Duty Cycle Mode
Duty cycle indicates the ON or OFF time in percent from 0% to 100% of period for repetitive pulse train. In the illustration, duty cycle is 100 x t / P. The same signal is applied to the A and B channels.
Duty Cycle and Elapsed Time of a Laser
Duty cycle can be used to indicate the ON time of a pulsed laser in relation to total time. Laureate counters can also measure elapsed time, the number of pulses, average width in µs, the number of pulses, and total energy applied.
Using Laureate Meters and Counters to Synchronize Motor Generators
Synchronization of two motor generators requires that the two frequencies be identical, that the lines be in phase, and that the line voltages be close to each other. In this illustration, a single Laureate dual channel counter measures both frequencies to six-figure accuracy in a few line cycles. Another Laureate dual channel counter measures phase angle to 0.1º resolution. Two Laureate AC RMS Voltmeters, which offer ranges of 200.00 V and 660.0 V, are used to display the two RMS voltage to 0.1% accuracy.
5672 Bolsa Avenue Huntington Beach, CA 92649 - USA - Ph (714) 622-2000 - Fax (714) 622-2001