Laureate™ AC Power Factor Meter & AC Phase Angle Meter

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AC phase angle & power factor meter
  • Programmable to read phase angle or power factor with two waveshapes of identical period
  • Phase angle resolution of 1°, 0.1° or 0.01° and accuracy of 0.03° at AC line frequency
  • Power factor from 1.000 to 0.000 with sinusoidal signals
  • Accepts AC signals from 1 Hz to 10 kHz at voltages up to 250 Vrms
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac powerr
  • 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)
AC Phase Angle Measurement
Phase angle measurement by digital phase meter
  • Phase angle in degrees indicates the phase lead or lag between two periodic signals of the same period, as determined from their zero crossings. These two signals will typically be the voltage and current applied to a load. As illustrated, the phase angle θ in degrees is +360*P1/P.
  • The Laureate™ Phase Angle & Power Factor Meter computes phase angle θ by timing zero crossings of two signals applied to Channels A and B. The phase angle range is selectable as 0° to 360° or -180° to +180°. Resolution is selectable as 1°, 0.1° or 0.01°. Typical accuracy is 0.01% from 1 Hz to 100 Hz, 0.1% at 1 kHz, and 1% at 10 kHz.
AC Power Factor Measurement
  • The power factor of an AC power system is the ratio of real power in watts (W) divided by apparent power in volt-amperes (VA). For sinusoidal signals differing by a phase angle θ, power factor is cos(θ).
  • The Laureate™ Phase Angle & Power Factor Meter computes power factor as cos(θ) from phase angle θ. Power factor readings can range from 1.000 to 0.000 with three decimal places and an accuracy of 0.1% for sinusoidal signals at 50/60 Hz power line frequency. While power factor is always positive, the meter artificially assigns a minus sign to power factor for negative phase angles, and it sets power factor to 0 for phase angles greater than 90°.
Designed for flexibility

The Laureate Phase Angle & Power Factor Meter utilizes the Laureate Extended counter main board and the FR dual-channel signal conditioner board, which accepts AC signals from 12 mV p-p to 250 Vrms. 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
Optimizing Meter Inputs for Phase Angle & Power Factor Measurement
Phase angle and power factor measurement with the Laureate™ Phase Angle & Power Factor Meter require that two signals of identical periods be applied to Channels A and B. For best accuracy, both signals should have the same amplitude, the signal amplitude should be larger than 1V, and the trigger level should be minimized by selecting the ±12 mV jumper position.

The meter times zero crossings to 0.1 µs resolution over a user-selectable gate time from 10 ms to 199.99 s. By selecting the minimum gate time of 10 ms, the meter update rate will be approximately 20/s for 50/60 Hz AC line frequency. Improved accuracy will be obtained by making the gate time long enough so that multiple cycles are averaged.

Both signals applied to the meter should be mutually isolated by transformer coupling, so that they can then share the same ground in the meter. The current signal is typically obtained from a current transformer (CT). This should ideally be a CT with a voltage output or a current output in the mA range, which can then be converted to a voltage higher than 1V across an external dropping resistor without excessive heat generation.
Using Laureate Meters and Counters to Synchronize Motor Generators
Using Laurel Meters and Counters to Synchronize Two 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 0.1° resolution. Two Laureate AC RMS Voltmeters, which offer ranges of 200.00 V and 600.0 V, are used to display the two RMS voltages to 0.1% accuracy.

Specifications Back to top
AC Power Factor Meter & AC Phase Angle Meter
Phase Angle Mode
Item Displayed
Display Units
Frequency Range
Maximum Timing Interval
Phase angle difference between two waves of same period
1°, 0.1°, 0.01°
0.005 Hz to 10 kHz
0.01°, 1 Hz to 100 Hz; 0.1° at 1 kHz; 1° at 10 kHz
0.05° at 50 or 60 Hz
200 sec
Power Factor Mode
Item Displayed
Display Units
Frequency Range
Power factor between two sine waves of same period
1.000 to 0.000
Negative sign indicates negative phase angle
0.005 Hz to 10 kHz
0.1% at power line frequencies
Update Rate
Timing interval
Gate Time
Time Before Zero Out
Gate time + 30 ms+ 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s (to indicate loss of signal)
6 LED digits, 7-segment, 14.2 mm (.56"), red or green
-999999 to +999999
Four LED lamps
Signal ranges
Signal ground
Noise filter
Nine AC signal ranges from 12 mVp-p to 250 Vac
Common ground for channels A & B
1 MHz, 30 kHz, 250 Hz (jumper selectable) + digital filter
Voltage, standard
Voltage, optional
Power consumption
   (typical, base meter)
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
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
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 (jumper selectable)
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
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
Signal Connections
Signal connections to Laurel pulse input batch controller
Ordering Guide Back to top
Laureate™ AC Phase Angle & Power Factor Meter
Click on the radio buttons below to build a complete model number with pricing.
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 L70000FR
Configured price per model $270
Quantity 1
Extended price $270
L7 Extended Main Board, Green LEDs
L8 Extended Main Board, Red LEDs
Note 1: Use of the Extended Main Board also makes this counter suitable for A-B time interval, stopwatch, frequency, rate, period, square root of rate, up or down total, arithmetic functions, simultaneous rate and total, duty cycle, batching, and custom curve linearization.
Note 2: If the meter is to be used for power factor, please so indicate in a note at the time order.
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, 0-10 V, -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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