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

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1
LAUREL
ELECTRONICS, INC.
Laureate™ True RMS AC Voltage & Current
Meter with 1 Cycle Update at 50/60 Hz
Features
• True AC or AC plus DC RMS measurement with crest factor of 3.0 at FS
• Fast response, 0-16.7 ms to rated accuracy after each input signal cycle
• Measurement range from 0.1% to 100% of full scale
• Accurate to 99.9% of full scale, 10 Hz to 10 kHz
• 0.2, 2, 20, 200 & 600V voltage ranges
• 2, 20, 200 mA & 5A current ranges
• All ranges factory calibrated
• Scalable to 5 digits for external current shunts or 5A current transformers
• Selectable peak or valley display
• 85-264 Vac universal AC power supply
• 1/8 DIN case sealed to NEMA-4X from front panel
• Optional serial I/O: Ethernet, USB, RS232, RS485, Ethernet-to-RS485 converter
• Optional relay output: dual or quad relays, contact or solid state
• Optional isolated analog output: 4-20 mA, 0-20 mA, 0-10V, -10 to +10V
• Optional low voltage power: 10-48 Vdc or 12-32 Vac
• Priced competitively with less capable AC meters
Description
The Laureate™ True RMS meter is a 60,000 count digital panel
meter with exceptional performance at half the price of a bench
top meter. It can measure true RMS voltage or current of AC
signals where there is considerable distortion of the waveform,
such as rectifier outputs or waveforms chopped by an SCR,
TRIAC or transistor circuit, as illustrated.
• True RMS readings in 0-16 ms after completion of one input
signal cycle allow anomalies to be detected and alarmed
before they become expensive problems. Fast on/off control
and alarm can be achieved with optional dual or quad relays,
either contact or solid state. The meter can also capture peak
and valley readings that occur at 50/60 Hz.
• Accuracy is 0.1% of full scale for signals from DC to 10 kHz
and signal amplitudes down to 0.1% of full scale. The crest
factor (Vp / Vrms) is 3.0 at full-scale Vrms of 20,000 counts
and a Vp of 60,000 counts. The meter starts to flash
overrange at 132% of full scale Vrms , at which point the
available crest factor is 60,000 / 26,400 = 2.27. Meaningful
readings with rated resolution continue to be obtained up to
212% of full scale Vrms (42,433 counts) for sinusoidal signals,
at which point the available crest factor is 1.414. For safety
reasons, the maximum RMS input signal should never exceed
600V or 5A. ETL certification is for a maximum voltage of 300
Vrms.
AC or DC coupling is jumper selectable on the signal condition-
er board. AC coupling accommodates signals from 10 Hz to 10
kHz and is suitable for applications such as measuring AC ripple
on a DC power supply. DC coupling accommodates signals from
0 to 10 kHz. Multiple integral cycles are averaged for signals
above 50/60 Hz. A single cycle is captured for signals from 3 Hz
to 50/60 Hz. Below 3 Hz and at DC, the
capture rate is 3/sec.
Use with current Transformers. High
common mode rejection allows stable
readings with current shunts located on
the high side of the line. Five amp input
capability allows the output of 5A current
transformers to be applied directly to the
meter, with no need for a stepdown
transformer. The meter reading can easily be scaled for the
current transformer ratio. Digital filtering is selectable for noisy
signals.
Designed for system use. Optional plug-in boards include
Ethernet and other 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 trans-
ducers and eliminate the need for an external power supply. All
power and signal connections are via UL / VDE / CSA rated
screw clamp plugs.