Laurel Electronics Laureate Digital Panel Meter for DC Voltage or Current - Manual

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1
LAUREL
ELECTRONICS, INC.
Laureate™ Digital Panel Meter
for DC Voltage or Current
Features
• Selectable ±0.2, ±2, ±20, ±200, ±300 & ±600 Vdc voltage ranges
• Selectable ±2, ±20, ±200 mA and ±5A dc current ranges
• All ranges factory calibrated
• 99.99% full scale accuracy
• Scalable to ±99,999 for use with external current shunts
• Up to 60 conversions per second
• Peak or valley capture & display
• Selectable adaptive digital filter
• Universal AC power: 85-264 Vac
• Built-in isolated excitation supply: 5, 10 or 24 Vdc
• 1/8 DIN case sealed to NEMA-4X from front panel
• Optional serial I/O: Ethernet, USB, RS232, RS485, Ethernet-to-RS485 converter
• 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
Description
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 1 Gohm high input impedance.
• DC ammeter operation (selected by jumpers) provides four
full-scale current ranges from ±2.0000 mA with 0.1 mA reso-
lution to ±5.000 A with 1 mA resolution. The 5.000A 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 condi-
tioner 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
display 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 conver-
sion. 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 aver-
age 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 con-
stant. 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 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 trans-
ducers and eliminate the need for an external power supply. All
power and signal connections are via UL / VDE / CSA rated
screw clamp plugs.