Laureate™ DC voltage and current panel meters with a DC signal conditioner board combine high accuracy with high read rate and a wide range of isolated output options for computer interface and control. Accuracy is 99.99% of full scale ±2 counts.

• DC voltmeter operation (selected by jumpers) provides and six full-scale voltage ranges from ±200.00 mV with 10 mV resolution to ±600.0V with 100 mV resolution. The 200.00 mV and 2.0000V ranges provide a high input impedance of 1 Gohm to minimize the load on the voltage signal.
• DC ammeter operation (selected by jumpers) provides four full-scale current ranges from ±2.0000 mA with 0.1 mA resolution to ±5.000 A with 1 mA resolution. The 5.000 A range measures the IR drop across a built-in 10 milliohm current shunt.

All voltage and current ranges are factory calibrated, with calibration factors for each range stored in an EEPROM on the signal conditioner board. This allows ranges and signal conditioner boards to be changed in the field without recalibrating the meter.

External current shunts are fully supported. Scaling from full-scale millivolts, such as 50 mV or 100 mV, to amperes is easily accomplished from the front panel of the meter. The scalable readout is five full digits up to ±99,999 counts.

High read rates at up to 60 or 50 conversions per second while integrating the signal over a full power cycle are provided by Concurrent Slope (US Pat 5,262,780) analog-to-digital conversion. High read rates are ideal for peak or valley capture, real-time computer interface, and control. Peak and valley values are automatically captured. These may be displayed via a front panel pushbutton command or a control signal at the rear connector, or be transmitted as serial data.

Digital filtering is selectable for electrically noisy environments, including a batch averaging filter and an adaptive moving average filter which provides a choice of 8 time constants from 80 ms to 9.6 s. When a significant change in signal level occurs, that filter adapts by briefly switching to the shortest time constant to follow the change, then reverts back to the selected time constant. In a selectable Auto filter mode, the filter time constant is automatically selected based on detected signal noise.

Designed for system use. Optional plug-in boards for communications and control 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 transducers and eliminate the need for an external power supply. All power and signal connections are via UL / VDE / CSA rated screw clamp plugs.

Features

• ±0.2, ±2, ±20, ±200, ±300V & ±600V DC voltage ranges
• ±2, ±20, ±200 mA and ±5A DC current ranges
• 99.99% full scale accuracy ±2 counts
• Front panel scalable to ±99,999 for use with current shunts
• Transducer excitation output, 5, 10 or 24 Vdc (isolated)
• 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)
  - Serial data I/O: Ethernet, USB, RS485, RS232 (isolated)
  - Custom curve linearization, rate from consecutive readings

Display
Readout	5 LED digits, 7-segment, 14.2 mm (.56"), red or green.
Range	-99999 to 99999 or -99990 to 99990 (count by 10)
Indicators	Minus sign, 2 red LED lamps
A-to-D Conversion
Technique	Concurrent Slope™ (Pat 5,262,780)
A-to-D rate	60/s at 60 Hz, 50/s at 50 Hz
Output update rate	56/s at 60 Hz, 47/s at 50 Hz
Display update rate	3.5/s at 60 Hz, 3/s at 50 Hz
Accuracy
Error at 25°C	0.01% FS ± 2 counts (except 5A range)
Span tempco	0.003% of reading/°C
Zero tempco	0.1 count/°C
Noise Rejection
CMR, DC to 60 Hz	130 dB
NMR at 50/60 Hz	90 dB with min filtering
Maximum Signal
Max applied voltage	600 Vac for 20, 200 and 300 V ranges, 125 Vac for other ranges
Current protection	25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5 A
Power

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
Excitation Output (standard)
5 Vdc	5 Vdc ± 5%, 100 mA
10 Vdc	10 Vdc ± 5%, 120 mA
24 Vdc	24 Vdc ± 5%, 50 mA
Output Isolation	50 Vdc to meter ground
Analog Output (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 (< 60Ω load)
Scaling	Zero and full scale adjustable from -99999 to +99999
Resolution	16 bits (0.0015% of full scale)
Isolation	250V rms working, 2.3 kV rms per 1 min test
Relay Outputs (optional)
Relay types	2 Form C contact relays or 4 Form A contact relays (NO) 2 or 4 Form A, AC/DC solid state relays (NO)
Current tatings	8A at 250 Vac or 24 Vdc for contact relays 120 mA at 140 Vac or 180 Vdc for solid state relays
Output common	Isolated commons for dual relays or each pair of quad relays
Isolation	250V rms working, 2.3 kV rms per 1 min tes
Serial Data I/O (optional)
Board selections	RS232, RS485 (dual RJ11 or RJ45 connectors), USB, Ethernet, USB-to-RS485 converter, Ethernet-to-RS485 converter
Protocols	Modbus RTU, Modbus ASCII, Modbus TCP (Ethernet), Laurel ASCII
Data rates	300 to 19200 baud
Digital addresses	247 (Modbus), 31 (Laurel ASCII),
Isolation	250V rms working, 2.3 kV rms per 1 min test
Signal Connections
Environmental
Operating temperature	0°C to 55°C
Storage temperature.	-40°C to 85°C
Relative humidity	95% at 40°C, non-condensing
Protection	NEMA-4X (IP-65) when panel mounted