Laureate™ 16-Bit Analog Output Option
Isolated 4-20 mA, 0-20 mA or 0-10V or -10 to +10V analog output scaled
to readout of digital panel meters, counters and remote displays

Features

16-bit resolution (1 part in 65,536 or 0.0015% of full scale)
4-20 mA, 0-20 mA, 0-10V, or -10 to +10V analog output
Analog output linearized to reading
Analog output isolated to 250 Vac
ą0.02% full scale accuracy
Scale and offset via meter front panel, RS232, RS485 or USB
50 Hz or 60 Hz update rate
12V compliance at 20 mA
Output derived from filtered or unfiltered signal input
Certified to UL 61010C-1 (UL Mark), EN 61010-1 (CE Mark), and RoHS

Description

Using a digital panel meter or electronic counter as an isolated 4-20 mA current loop transmitter

A 16-bit analog output option board can turn a Laureate 1/8 DIN digital panel meter, counter, timer or remote display into a superb, isolated, linearized transmitter or signal conditioner with exceptional accuracy and high-speed response. The analog output for thermocouples, RTDs and custom curves is linearized to the displayed reading.

The analog output can be selected as 4-20 mA, 0-20 mA, unipolar 0-10V, or bipolar -10V to +10V with a 20V span. If a voltage output is selected, output pins 1 and 2 may be reversed to provide reversed polarity.

A 16-bit D-to-A converter provides 0.0015% full-scale resolution and ą0.02% full-scale accuracy. The update rate for meters is a fast 60/sec for 60 Hz power or 50/sec at 50 Hz power. The analog output can track the unfiltered signal for fastest response, or a digitally filtered signal for best noise rejection.

Scaling of the analog output is easily entered via the meter's front panel pushbuttons or serial digital interface using Instrument Setup software. The displayed readings to produce the low and high analog outputs can be set to any value from -99,999 to +99,999 for DPMs, or -999,999 to +999,999 for counters and timers.

Isolation from power and signal is provided by a separate power supply in the meter. This supply can drive 20 mA of current into loads up to 600 ohms for 12V compliance. Isolation to signal ground and power ground eliminates problems caused by ground loops.

Laureate DIN rail transmitters, whether 4-20 mA transmitters or serial output transmitters, also come with a scalable 16-bit analog output, which can be configured for current or voltage.

Specifications

Electrical

Power source
Signal source
Output linearization
Output Levels (selectable)
Compliance at 20 mA
Compliance at 10 V
Isolation
Output resolution
Output nonlinearity
Accuracy
Output update rate, DPMs
Output update rate, counter rate meter

Provided by meter
Filtered or unfiltered digitized signal
Linearized to reading
4-20 mA, 0-20 mA, 0-10V, -10 to 10V
12V ( 600 Ohm max load )
2 mA ( 5 kOhm min load)
250V rms working, 2.3 kV rms per 1 min test
16 bits (0.0015% of full scale)
< 0.01% of full scale
< 0.02% of full scale
50 or 60/sec (output may be digitally filtered)
Gate time + 30 ms + 0-2 periods

Scaling

Zero output & full-scale output, DPMs
Zero output & full-scale output, counters
Minimum span

-99,999 to +99,999 counts
-999,999 to +999,999 counts
150 counts

J4 Pin Assignments

Unipolar Connections			Bipolar Connections
4-20 mA or 0-20 mA output 1 0-10V output 2 Isolated ground 3			Reference or Return 1 -10V to +10V Output 2 N/C 3

Application Examples
Driving a Strip-chart Recorder
	The 0-10V or -10 to +10V output capability of the analog output board is ideal to drive a chart recorder. The voltage output can be scaled to highlight signal changes in a range of interest.
Use as an Isolated, Linearized 4-20 mA Transmitter

4-20 mA output capability turns Laureate meters and counters into high-accuracy, high-speed, isolated 4-20 mA transmitters. The output is linearized to the reading, a major benefit with thermocouple or RTD inputs.

The 4-20 mA signal can be transmitted via twisted pair wires to a control room for supervisory process monitoring and control. Process meters in series with the signal can provide a local readout where required.