Laurel

Laureate™ DC Voltage & Current Digital Panel Meters

(High accuracy, high read rate, control outputs)
Features
  • 0.2, 2, 20, 200 and 660 V ranges.
  • All ranges factory calibrated.
  • 4 1/2 digit resolution to ±19,999 for direct readout in mV, V, mA or A.
  • Field scalable from front panel to ±99,999 for use with external current shunts.
  • Peak value display.
  • Selectable fixed zero or active least significant digit.
  • NEMA 4X, 1/8 DIN case.
  • Choice of isolated plug-in options for control and computer interface.
  • 2, 20, 200 mA and 5 A ranges.
  • 99.99% full scale accuracy.
  • 1 Gohm input impedance on 200 mV and 2 V scales.
  • Up to 60 conversions per second.
  • Selectable adaptive digital filter.
  • 5, 10 or 24 Vdc excitation supply.
  • External controls for reset, meter hold and decimal points.
  • Certified to UL 3101-1, CAN/CSA-C22.2, EN 61010-1 (CE Mark).
DC-panel-meters
Use with External Current Shunts
The Laureate can be used with external current shunts, which typically produce 50 mV or 100 mV at their rated maximum current. Scaling from millivolts to amperes for a specific shunt value is easily accomplished from the front panel of the meter. The scalable readout is five full digits up to ±99,999 counts. Since the voltage signal from a current shunt can be noisy, the Laureate provides a selectable, adaptive moving-average digital filter, as explained below.
All Ranges Precalibrated
All voltage and current ranges are calibrated at the factory, with calibration factors for each range stored in an internal EEPROM. This allows ranges to be changed without recalibrating the meter.
High Read Rate and Peak Capture
All Laureate voltmeters use Concurrent Slope (US Pat 5,262,780) analog-to-digital conversion, which allows up to 60 or 50 conversions per second while integrating the signal over a full power cycle. High read rate is ideal for peak capture, real-time computer interface, and control.

The peak value of the input signal is automatically captured and may be displayed via a front panel pushbutton command or a control signal at the rear connector since the last meter reset. Other controls at the rear connector include meter hold, meter reset, and decimal point selection

Selectable Signal Filtering
The displayed readings and the data outputs can be separately selected to be either unfiltered or filtered.

An unfiltered selection updates after each conversion for fastest response.

A batch average filter selection averages each 16 conversions for an update every 1/4 sec.

An adaptive moving average filter selection provides a choice of 8 time constants from 80 ms to 9.6 s. When a significant change in signal level occurs, the filter adapts by briefly switching to the shortest time to follow the change, then reverts back to its selected time constant. Another choice is Auto, which provides an automatic time constant selection based on the signal noise characteristics

Isolated Excitation Supply
5, 10 and 24 Vdc isolated excitation outputs are standard to power external devices, such as transducers or transmitters. In many cases, these outputs can eliminate the need for an external supply
Interface Options
Plug-in isolated analog output, dual setpoint controller, and RS-232, RS-485 communications or BCD output boards can upgrade the Laureate from a simple monitor to system interface and control.
Built-in Flexibility & Safety
Laureates may be powered from 85-264 Vac and 90-370 Vdc, or optionally from 8-28 Vac and 9-37 Vdc. They are available with red or green LEDs. They are housed in a 1/8 DIN case that meets NEMA 4X (IP65) specifications from the front when panel mounted. Any setup functions and front panel keys may be locked out for simplified usage and security

Specifications

DC Voltage DC Voltage Range Resolution Input Ohms Error at 25°C ±1 count
200.00 mV 10 µV 1 G 0.01% FS
2.000 V 100 µV 1 G 0.01% FS
20.000 V 1 mV 1 M 0.01% FS
200.00 V 10 mV 1 M 0.01% FS
660.0 V 100 mV 1 M 0.03% FS
 
DC Current 2.0000 mA 0.1 µA
100 0.01% FS
20.000 mA
1.0 µA
10 0.01% FS
200.00 mA
10 µA 1 0.01% FS
5.000 A 1.0 mA 0.01 0.04% FS

DC Voltage & Current

Display A-to-D Conversion
Readout 5 digits, 7-segment, 14.2 mm (.56") Technique Concurrent Slope™ (Pat 5,262,780)
Color Red or green LED A-to-D Rate 60/s at 60 Hz, 50/s at 50 Hz
Range -99999 to +99999 or -99990 to +99990 (count by 10 with
rounding)
Output Update 56/s at 60 Hz, 47/s at 50 Hz
Indicators Minus sign, 2 red LED lamps Display Update 3.5/s at 60 Hz, 3/s at 50 Hz
Accuracy Noise Rejection
Span Tempco 0.003% of reading/°C CMR, DC to 60 Hz 130 dB
Zero Tempco 0.1 counts/°C NMR at 50/60 Hz 90 dB with min filtering
Maximum Signal Power
Max applied voltage 660 Vac for 20, 200 and 600 V ranges, 125 Vac for other ranges
Voltage, std.
85-264 Vac and 90-370 Vdc
Frequency
DC or 49-440 Hz
Overcurrent protection 25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5 A Voltage, opt. 8-28 Vac and 9-37 Vdc
Power isolation Safety-rated to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test
Excitation Output Connector Pin Assignments
5 Vdc 5 Vdc ±5%, 100 mA max asd
10 Vdc 10 Vdc ±5%, 120 mA max
24 Vdc 24 Vdc ±5%, 50 mA max
Output isolation 50 Vdc to meter ground
Environmental
Operating Temperature 0°C to 55°C
Storage Temperature -40°C to 85°C
Relative HumidityProtection NEMA-4X (IP-65) when panel mounted
Purchase
5672 Bolsa Avenue Huntington Beach, CA 92649 - USA - Ph (714) 622-2000 - Fax (714) 622-2001