Laurel Electronics Laureate True RMS AC Voltage User Manual

LAUREL

True RMS AC Voltage & Current

ELECTRONICS, INC.

Laureate™

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

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0.2, 2, 20, 200 & 600V voltage ranges

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2, 20, 200 mA & 5A current ranges

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All ranges factory calibrated

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Scalable to 5 digits for external current shunts or 5A current transformers

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Selectable peak or valley display

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85-264 Vac universal AC power supply

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1/8 DIN case sealed to NEMA-4X from front panel

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Optional serial I/O: Ethernet, USB, RS232, RS485, Ethernet-to-RS485 converter

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Optional relay output: dual or quad relays, contact or solid state

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Optional isolated analog output: 4-20 mA, 0-20 mA, 0-10V, -10 to +10V

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Optional low voltage power: 10-48 Vdc or 12-32 Vac

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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 condition­er 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 built­in isolated 5, 10, or 24 Vdc excitation supply can power trans­ducers and eliminate the need for an external power supply. All
power and signal connections are via UL / VDE / CSA rated
screw clamp plugs.

LAUREL

ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel [phone] • www.laurels.com 1

Specifications

AC Voltage (0.1% to 100% of full scale range)

AC Voltage

FS Range

200.00 mV

2.0000 V

20.000 V

200.00 V

600.0 V * 650 V 100 mV 1 MΩ ± 2V

* The 600V range is ETL certified to 264V. For purposes of accuracy calculation, the 600V range is 2000V

(20,000 counts), and the 5A range is 20A (20,000 counts).

AC Current (0.1% to 100% of full scale range)

AC Current

FS Range

2.0000 mA

20.000 mA

200.00 mA

5.000 A 5.4 A 1 mA 0.01 Ω ± 20 mA

Both AC Voltage & Current

Display

Readout
Range
Display Update Rate
Indicators
Crest factor Vp / Vrms

AC Voltage to

Overrange Flash

264.00 mV

2.640 V

26.400 V

264.00 V

AC Current to

Overrange Flash

2.6400 mA

26.400 mA

264.00 mA

5 LED digits, 7-segment, 14.2 mm (.56"), red or green

-99999 to 99999 or -99990 to 99990 (count by 10)

3.75/s at 60 Hz power, 3.1/s at 50 Hz power
1 LED lamp per relay setpoint

3.00 at full scale range,

2.27 at 132% of FS range (display flashes),

1.414 at 212% of FS range (maximum sinusoidal signal)

Resolution

10 µV

100 µV

1 mV

10 mV

Resolution

0.1 µA

1.0 µA
10 µA

Input

Resistance

1 MΩ
1 MΩ
1 MΩ
1 MΩ

Input

Resistance

100 Ω

10 Ω

1 Ω

Error at 25°C ± 2 counts

± 0.1% of FS, 0-100% of FS, 10 Hz to
10 kHz (AC coupling) or DC to 10 kHz

(DC coupling)

Error at 25°C ± 2 counts

± 0.1% of FS, 0-100% of FS, 10 Hz to
10 kHz (AC coupling) or DC to 10 kHz

(DC coupling)

Output Update Rate

A-to-D rate
Signals > 50/60 Hz
Signals 3 to 50/60 Hz
Signals DC to 3 Hz

Maximum Signal

Max applied voltage
Current protection

Power

Voltage, standard
Voltage, optional
Frequency
Power Isolation

Analog Output (optional)

Output Levels
Current compliance
Voltage compliance
Scaling
Resolution
Isolation

60/s at 60 Hz power, 50/s at 50 Hz power
60/s at 60 Hz power, 50/s at 50 Hz power
Signal frequency
3 per second

600 Vac for 2, 20, 200, 600V ranges, 50 Vac for 0.2V range
25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5A

85-264 Vac or 90-300 Vdc (DC operation not ETL approved)
12-32 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test

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

LAUREL

ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel [phone] • www.laurels.com 2