The Laureate Model DC Digital Voltmeter and Ammeter is a UL-listed, 4½ digit panel meter which combines 0.01% full-scale accuracy with read rates up to 60/sec. Such high read rates are ideal for peak capture, alarm and control, and real-time computer interface. The Laureate DC is ideal for use with external current shunts, which typically produce 50 mV or 100 mV at their rated maximum current. Used as a direct-reading voltmeter, the Laureate DC provides five full-scale voltage ranges from 200.00 mV with 10 µV resolution to 300.0 V with 100 mV resolution. The 200.00 mV and 2.000 V ranges provide a high input impedance of 1 Gohm to minimize the load on the voltage signal. Used as a DC ammeter, the Laureate DC provides four full-scale direct-reading 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 mW current shunt. All voltage and current ranges are calibrated at the factory, with calibration factors for each range stored in EEPROM. This allows ranges to be switched without recalibrating the meter. Scaling from millivolts to amps for a specific current shunt value is easily accomplished from the front panel of the meter. Since the shunt signal can be noisy, the Laureate DC provides an adaptive digital filter with selectable time constants. This filter quiets the reading in noisy environments, yet responds quickly to changes in level that exceed a threshold. 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 and meter reset. An isolated 5, 10 and 24 Vdc excitation output is standard to power external devices, such as transducers or transmitters. Options include dual relays for control or alarm, isolated 4-20 mA and 0-10V analog outputs, and an RS232 or RS485 port for data communications with a host computer or PLC. Modbus RS485 is fully supported. The base price is $220. For more information and pricing of options, visit www.laurels.com/dcmeter.htm
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