Daytronic Corporation - 2000 Series Analog Output Option

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"C" Option

Analog Output Option

An optional plug-in board provides an isolated 0-10 VDC signal for analog closed-loop control, or to drive a chart recorder or remote display—plus an isolated 0-20 mA or 4-20 mA signal for transmission to a computer or central control room (thus turning any 2000 instrument into a high-accuracy 4-wire transmitter, as shown in the figure below).

A 12-bit D/A converter provides 0.025% resolution. The update rate is a fast 56/s at 60 Hz power (47/s at 50 Hz). The output selected in software is calibrated to 99.9% accuracy, while the nonselected output is accurate to 98%. Output for thermocouples, RTD's, and custom curves is linearized to the displayed reading.

Isolation to signal ground and power ground eliminates common ground-loop problems. The isolation supply is powered by the basic meter, and can drive 20 mA current into a load of up to 600 ohms with 12-V compliance.

Both voltage and current outputs may be easily scaled by front-panel push buttons or by commands issued over the optional serial interface. Both voltage and current outputs are available at the same time, and the same scaling applies to both.

Depending on the application, the analog output can track the filtered signal input (for best noise rejection) or the unfiltered input (for fastest response).


0-20 mA output capability turns 2000 instruments into high-accuracy, high-speed, isolated 4-20 mA TRANSMITTERS. The output is linearized to the reading (a major benefit with thermocouple and RTD inputs). The 4-20 mA signal can be transmitted via twisted pair wires to a control room for supervisory process monitoring and control. Model 2162 Process Signal Meters in series with the signal can provide local readouts in engineering units where required.


The 0-10 V output capability of the Analog Output Board is ideal for driving a strip chart recorder. As with the 4-20 mA output, the 0-10 V output can be scaled to the meter reading to highlight signal-level changes in a range of interest.

Analog Output Specifications [Top ]
Power	Provided by basic meter
Signal Source	Filtered or unfiltered digitized signal
Output Linearization	Linearized to display
Output Levels	0-20 mA (or 4-20 mA) and 0-10 VDC
Compliance
0 to 20 mA	12 V (0 to 600 Ω load)
0 to 10 V	2 mA (5 kΩ min. load)
Accuracy	99.9% selected output, 98% nonselected output
Output Nonlinearity	Less than 0.05%
Output Resolution	12-bit (0.025% of full scale)
Output Update Rate	56/s at 60 Hz; 47/s at 50 Hz
Isolation	Safety-rated to 250 VAC, 4.2 kV peak per high-voltage test
Response Time
For DPM	17 milliseconds, typical (unfiltered)
For Counter Meter	Gate time + 30 mx + 2 periods max.
Scaling
Reading for Zero and Full-Scale Output	-99,999 to +99,999 (DPM); -999,999 to +999,999 (Counter Meter)
Maximum Span	150 counts

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