Laurel Electronics
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Panel Meters - Counters - Timers - Transmitters, 4-20 mA & Modbus - Ethernet - USB - RS485 - RS232

Laureate™ True RMS AC Voltage & Current Meter, 1 Cycle Update at 50/60 Hz.

200 mV - 600 V and 2 mA - 5 A full-scale ranges



  • 0.2, 2, 20, 200 & 600V AC or AC+DC voltage ranges
  • 2, 20, 200 mA & 5A AC or AC+DC current ranges
  • True AC RMS measurement with crest factor of 3.0 at full scale
  • Fast response: reading in 0-16.7 ms after each signal cycle to full accuracy
  • Accurate to 0.03% of full scale, 0.1% to 100% of FS, 10 Hz to 10 kHz
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
  • Wide choice of options:
    - 2 or 4 relays, mechanical or solid state (isolated)
    - Analog output, 4-20 mA, 0-10V, or -10V to +10V (isolated)
    - Communications: Ethernet, WiFi, USB, RS232, RS485 (isolated)
    - Custom curve linearization, rate from consecutive readings
  • -X extended operating temperature option from -40°C to 70°C
True RMS digital panel meter by Laurel Electronics

True RMS meter 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 the nominal rate of 50/60 Hz.
  • Accuracy is 0.03% of full scale with the meter's standard 1 Megohm input resistance, signals from DC to 10 kHz, and signal amplitudes down to 0.1% of full scale. A version with 10 Megohm input resistance is available as a factory special, but decreases the maximum frequency from 10 kHz to 1 kHz for three of the voltage ranges.
  • PowerThe 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. AC coupling is suitable for applications such as measuring the ripple on a DC power supply. 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 every 333 ms.

current Transformers 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 for communications and control include Ethernet, WiFi and 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. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.


AC Voltage

AC Voltage
FS Range
AC Voltage to
Overrange Flash
Resolution Input Resistance
Error at 25°C **
200.00 mV 264.00 mV 10 µV 1 MΩ
± 0.03% of FS ± 2 cts, 0-100% of FS
2.0000 V 2.640 V 100 µV
20.000 V 26.400 V 1 mV
200.00 V 264.00 V 10 mV
600.0 V* 650 V 0.1 V ± 0.8 V
300.0 V 650 V 0.1 V ± 0.8 V

AC Current

DC Current Range AC Current to
Overrange Flash
Resolution Input Resistance Error at 25°C **
2.0000 mA 264.00 µA 0.1 µA 100 Ω ± 0.03% of FS ± 2 cts, 0-100% of FS
20.000 mA 26.400 mA 1.0 µA 10 Ω
200.00 mA 264.00 mA 10 µA 1 Ω
5.000 A 5.4 A 1 mA 0.01Ω ± 20 mA
*   For purposes of accuracy calculation, the 600V range is 2000V (20,000 counts), and the 5A range is 20A (20,000 counts).

Both AC Voltage & Current

Readout 5 LED digits, 7-segment, 14.2 mm (.56"), red or green
Range -99999 to 99999 or -99990 to 99990 (count by 10)
Display Update Rate 3.75/s at 60 Hz power, 3.1/s at 50 Hz power
Indicators 1 LED lamp per relay setpoint
Crest factor Vp / Vrms 3.00 at full scale range
Output Update Rate
A-to-D rate 60/s at 60 Hz power, 50/s at 50 Hz power
Signals > 50/60 Hz 60/s at 60 Hz power, 50/s at 50 Hz power
Signals 3 Hz to 50/60 Hz Same as signal frequency
Signals DC to 3 Hz 3 per second
Maximum Signal
Max applied voltage 600 Vac for 2, 20, 200, 600V ranges, 35 Vac for 0.2V range
Current protection 25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5A
Power Supply Boards (one required)
Voltage, standard 85-264 Vac or 90-300 Vdc
Voltage, optional 12-32 Vac or 10-48 Vdc
Frequency DC or 47-63 Hz
Power consumption (typical, base meter) 1.2W @ 120 Vac, 1.5W @ 240 Vac, 1.3W @ 10 Vdc, 1.4W @ 20 Vdc, 1.55W @ 30 Vdc, 1.8W @ 40 Vdc, 2.15W @ 48 Vdc
Power Isolation 250V rms working, 2.3 kV rms per 1 min test
Analog Output Board (one optional)
Output levels 4-20 mA, 0-20 mA, 0-10V, -10 to +10V (jumper selectable)
Current compliance 2 mA at 10V ( > 5 kΩ load)
Voltage compliance 12V at 20 mA (< 600 Ω load)
Scaling Zero and full scale adjustable from -99999 to +99999
Resolution 16 bits (0.0015% of full scale)
Step function response 80 ms to 99% of final value (typ)
Isolation 250V rms working, 2.3 kV rms per 1 min test
Relay Output Boards (one optional)
Dual magnetic relays 2 Form C, 8A at 250 Vac or 24 Vdc, 0.3A at 250 Vdc, resistive load
Quad magnetic relays 4 Form A (NO), 8A at 250 Vac or 24 Vdc, 0.3A at 250 Vdc, resistive load
Dual solid state relays 2 Form A (NO), 120 mA at 140 Vac or 180 Vdc, resistive load
Quad solid state relays 4 Form A (NO), 120 mA at 140 Vac or 180 Vdc, resistive load
Relay commons Isolated commons for dual relays or each pair of quad relays
Relay isolation 250V rms working, 2.3 kV rms per 1 minute test
Step function response 30 ms (typ) for contact relays, 25 ms (typ) for solid state relays
Relay latching modes Latching or non-latching
Relay active modes Active on or off, active high or low
Hysteresis modes QA passband mode, split hysteresis, span hysteresis
Communication Boards (one optional)
Board selections RS232RS485 with dual RJ11 connectors, RS485 with dual RJ45 connectors, USB, Ethernet, USB-to-RS485 gatewayEthernet-to-RS485 gateway, WiFi with built-in antenna plus USB & RS485, WiFi with external antenna plus USB & RS485
Protocols Laurel Custom ASCII (serial), Modbus RTU (serial), Modbus TCP (Ethernet or WiFi)
Digital addresses 247 (Modbus), 31 (Laurel ASCII),
Isolation 250V rms working, 2.3 kV rms per 1 min test
Signal Connections
Signal Connections
Operating temperature 0°C to 55°C standard, -40°C to 70°C with -X option
Storage temperature. -40°C to 85°C
Relative humidity 95% at 40°C, non-condensing
Protection NEMA-4X (IP-65) when panel mounted
Using Laureate Meters to Synchronize Two Motor Generators

Laureate Meters to Synchronize Two Motor Generators

Successful 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
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, as documented in this page. 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 .01% up to 100 Hz, .1% at 1 kHz, and 1% at 10 kHz.
For applications assistance, phone 714-434-6131 ext. 104, or email
Ordering Guide
Laureate™ True AC RMS Voltage & Current Panel Meters
Click on the radio buttons to build a model number with pricing as shown below. Prices are in US dollars and do not include shipping or duty charges (export sales). Please see our explanations and limitations applicable to pricing and online orders. Prices shown are in US Dollars and are Laurel's manufacturer's suggested retail price (MSRP) in the USA. Orders are processed manually, not directly by our shopping cart system. You don't have to supply credit card information when placing an online order.

North American Orders. Laurel does not sell factory-direct in the USA or Canada. Online sales orders are filled through distribution. During the ordering process, you will have the chance to select an authorized Laurel distributor, or you can ask Laurel to refer you to a distributor. The distributor will then contact you to quote shipping, tax and duty (where applicable), and arrange for payment.

International Orders. If your ship-to address indicates that you are outside of the USA or Canada and Laurel has a distributor in your country, we will forward your order to that distributor for follow-up. If Laurel does not have a distributor in your country, we will email you an order acknowledgment and a pro forma invoice which states the product price, shipping charges, and wire transfer information, which includes a $25 bank wire transfer fee.

Questions about your order? Please email your distributor or
Main Board L  Laureate Series meter, plug-in screw terminal connectors $157
Display Color 1  Basic DPM with green LEDs. $0
2  Basic DPM with red LEDs. $0
3  Extended DPM with green LEDs. $33
4  Extended DPM with red LEDs. $33
  “Extended” allows custom curve linearization and rate from successive readings. Not applicable to temperature.  
Power 0  Isolated 85-264 Vac or 90-300 Vdc $75
1  Isolated 12-32 Vac or 10-48 Vdc $115
0  None $0
1  Two 8A Contact Relays $101
2  Two 120 mA Solid State Relays $70
3  Four 8A Contact Relays $128
4  Four 120 mA Solid State Relays $96
0  None $0
1  Isolated 4-20 mA, 0-20 mA, 0-10 V, -10 to +10V $115
0  None $0
1  RS232 (L232) $81
2  RS485 (L485, dual RJ11 connectors) $109
4  RS485 (LMOD, dual RJ45 connectors, not for new design) $135
5  USB (LUSB) $81
6  USB-to-RS485 gateway (LUSB485) $135
7  Ethernet (LNET) $237
8  Ethernet-to-RS485 gateway (LNET485) $259
A  Ethernet + USB (LNET1) $182
B  Ethernet + RS485 (LNET1485) $204
C  WiFi + USB internal antenna (LWIFI) $171
D  WiFi + USB, external antenna (LWIFIX) $193
E  WiFi + USB + RS485, internal antenna (LWIFI485) $204
F  WiFi + USB + RS485, external antenna (LWIFIX485) $226
RMS Volts (AC RMS ranges are jumper selectable)
RMV1  200.00 mV $135
RMV2  2.0000 V $135
RMV3  20.000 V $135
RMV4  200.00 V $135
RMV5  600.0 V (range not ETL certified) $135
RMV6  300.0 V (range ETL certified) $135
RMS Amps (AC RMS ranges are jumper selectable)  
RMA1  2.0000 mA $135
RMA2  20.000 mA $135
RMA3  200.00 mA $135
RMA4  5.000 A $135
-X  Extended operating temperature option from -40°C to 70°C $33
CBL01  RS232 cable, RJ11 to DB9, 7 ft. Connects RS232 ports of meter and PC. $23
CBL02  USB to RS232 adapter cable. Combination of CBL02 and CBL01 connects meter RS232 port to PC USB port. Combination of CBL02 and CBL04 connects transmitter RS232 terminals to PC USB port. $47
CBL03-1  6-wire data cable, RJ11 to RJ11, 1 ft. Used to daisy chain meters via RS485. $10
CBL03-7  6-wire data cable, RJ11 to RJ11, 7 ft. Used to daisy chain meters via RS485. $10
CBL05  USB cable, A-B. Connects USB ports of meter and PC. $19
CBL06  USB to RS485 adapter cable, half duplex, RJ11 to USB. Connects meter RS485 port to PC USB port. $47
CASE1  Benchtop Laboratory Case for One 1/8 DIN Meter $140
CASE2  Benchtop Laboratory Case for Two 1/8 DIN Meters $140
NL  Meter Lens with Button Pads but no Laurels Logo $5
BL  Meter Lens without Button Pads or Laurels Logo $5
IPC  Splash-proof Cover $48
BOX1  NEMA-4 Enclosure $169
BOX2  NEMA-4 Enclosure plus IPC $218
Configured model number L10000RMV1
Configured price per model $367
Quantity 1
Extended price $367
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