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
•
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
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Selectable peak or valley display
•
85-264 Vac universal AC power supply
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1/8 DIN case sealed to NEMA-4X from front panel
•
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
•
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 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 714-434-6131 • 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 714-434-6131 • www.laurels.com 2
Relay Outputs (optional)
Relay types
Current ratings
Output common
Isolation
Serial Data I/O (optional)
Board selections
Protocols
Data rates
Digital addresses
Isolation
Signal Connections
Environmental
Operating temperature
Storage temperature
Relative humidity
Protection
2 Form C contact relays or 4 Form A contact relays (normally open)
2 or 4 Form A, AC/DC solid state relays (normally open)
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
Ethernet, Ethernet-to-RS485 server, USB, USB-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
0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
Mechanical
LAUREL
ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 3
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.
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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 nonsinusoidal 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.
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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.
LAUREL
ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 4
Ordering Guide
Create a model a model number in this format: L20000RMV1, IPC
DPM Type L Laureate Digital Panel Meter
Main Board 1 Standard Main Board, Green LEDs
2 Standard Main Board, Red LEDs
Power
(isolated)
Relay Output
(isolated)
Analog Output
(isolated)
Digital Interface
(isolated)
Signal Input
(isolated)
0 Isolated 85-264 Vac
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 Four120 mA Solid State Relays
0 None
1 Isolated 4-20 mA, 0-20 mA, 0-10 V, -10 to +10V
0 None
1 RS232
2 RS485(dual RJ11 connectors)
4 RS485 Modbus (dual RJ45 connectors)
5 USB
6 USB-to-RS485 device server
7 Ethernet
8 Ethernet-to-RS485 device server
True AC RMS Volts
RMV1 200.00 mV
RMV2 2.0000 V
RMV3 20.000 V
RMV4 200.00 V
RMV5 600.0 V (range UL certified to 250V)
RMV6 250.0 V
True AC RMS Amps
RMA1 2.0000 mA
RMA2 20.000 mA
RMA3 200.00 mA
RMA4 5.000 A
Add-on Options BL Blank Lens without Button Pads
CBL01 RJ11-to-DB9 Cable
CBL02 USB-to-DB9 Adapter
CBL05 USB Cable, A to B
IPC Splash-proof Cover
BOX1 NEMA-4 Enclosure
BOX2 NEMA-4 Enclosure plus IPC
LAUREL
ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 5
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