Laurel Electronics Laureate True RMS AC Voltage & Current Meter with 1 Cycle Update at 50-60 Hz - Manual (Page 4)

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 4
Applications
Using Laureate Meters to Synchronize Two Motor Generators
Synchronization of two motor generators requires that the voltage outputs of the generators be close to
each other, that the two frequencies be identical, and that the voltage waveshapes be in phase.
• The two voltages can be measured by two Laureate AC RMS Voltmeters, which offer 200.00 V and
600.0 V ranges. Or a single meter can be multiplexed by using an external toggle switch.
• Two frequencies A & B can be measured to six-figure accuracy by a single Laureate Dual Channel
Counter, where each channel monitors a generator. The two AC neutrals must be tied to meter
ground. Pressing a front-panel key toggles the reading between the channels. The meter can also
display frequency A - frequency B, or frequency A / frequency B without toggling.
• Phase angle can be measured using the Laureate Phase Meter.
Using Laureate Meters and Counters to Instrument an AC Line
Why Measure AC Power?
Many AC loads, such as electrical motors, will only operate reliably if the AC line voltage and frequency
are within specified tolerances; otherwise permanent damage to expensive plant equipment may occur.
Drops in line voltage or frequency may indicate an excessive load and the possibility of equipment
damage. Laureate meters and counters are low-cost means to instrument and alarm AC power lines with
great accuracy:
• AC RMS Voltmeter and Ammeter. True RMS capability allows the display of RMS voltage for non-
sinusoidal waveshapes, such as square waves from a UPS. A built-in 5 A range can be used to display
currents up to 5.000 A with 1 mA resolution or accept the output of 5 A current transformers. The
200.00 mV range can be used with external current shunts. With either transformers or shunts, scaling
of the input current is easily accomplished via the meter's front panel pushbutton switches.
• Frequency Meter. Inverse period is used to determine AC line frequency to six-figure accuracy
(60.0000 or 50.0000) in a few line cycles plus 30 ms.
• Phase Angle & Power Factor Meter. Two signals with identical periods are applied to Channels A
and B. A phase angle resolution of 1°, 0.1° or 0.01° is selectable. Accuracy is 0.01% up to 100 Hz,
0.1% at 1 kHz, and 1% at 10 kHz.