Laureate™ AC Power Factor Meter
& AC Phase Angle Meter

• Measures power factor or phase angle between two waveshapes of identical period
• Power factor readings from 1.000 to 0.000 with sinusoidal signals
• Minus sign for power factor with negative phase angle
• Phase angle resolution of 1º, 0.1º or 0.01º
• Phase angle accuracy of 0.05º at AC line frequency
• AC line voltages up to 250 Vrms
• AC frequency of 1 Hz to 10 kHz
• Universal AC input power, 85-264 Vac
• External controls for reset, meter hold and decimal points
• NEMA 4X, 1/8 DIN case
• Certified to UL 61010C-1 (UL mark), EN 61010-1 (CE mark), and RoHS
  Options:
• Low voltage power: 10-48 Vdc or 12-32 Vac
• 2 or 4 output relays, electromechanical or solid state
• 1 or 2 analog outputs: Isolated, 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
• Serial communications: RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter

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 0º to 360º or -180º to +180º. Resolution is selectable as 1º, 0.1º or 0.01º. Typical accuracy is 0.01% from 1 Hz to 100 Hz, 0.1% at 1 kHz, and 1% at 10 kHz.

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 will be 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. Plug-in option boards include single or dual isolated analog outputs, dual or quad relay outputs, and serial communications boards, which can upgrade the Laureate ratio meter from stand-alone monitor to system interface and control. Laureates may be powered from 85-264 Vac or optionally from 12-32 Vac or 10-48 Vdc. They are 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.

Phase Angle Mode

Item Displayed
Display Units
Frequency Range
Accuracy

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

Power Factor Mode

Item Displayed
Display Units
Polarity
Frequency Range
Accuracy

Power factor between two sine waves of same period
1.000 to 0.000, 1.00 to 0.00, or 1.0 to 1.0
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)

Display

Readout
Range
Indicators

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

Inputs

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

Power

Voltage, standard
Voltage, optional
Frequency
Power Isolation

85-264 Vac or 90-300 Vdc (DC operation not UL approved)
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
Scaling
Resolution
Isolation

4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable)
2 mA at 10V ( > 5 kOhm load)
12V at 20 mA ( < 600 Ohm 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
Isolation

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
130 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
Protocols
Data Rates
Digital Addresses
Isolation

RS232, RS485, Modbus RS485, USB, USB-to-RS485 converter
Modbus RTU, Modbus ASCII, simpler Laurel ASCII
300 to 19200 bps
247 (Modbus), 31 (Laurel ASCII),
250V rms working, 2.3 kV rms per 1 min test

Environmental

Operating Temperature
Storage Temperature
Relative Humidity
Protection

0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted

Signal Connections

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 600.0 V, are used to display the two RMS voltages to 0.1% accuracy.