Features
  

• 0-20 mA or 4-20 mA plus 0-10 Vdc
• 0.025% resolution
• Isolation to 250 Vac
• Outputs linearized to reading
• Scale and offset via RS-232, RS-485, or front panel
• 56/s update rate at 60 Hz power, 47/s at 50 Hz power
• 12 V compliance at 20 mA
• Output derived from filtered or unfiltered signal input

The Micro analog output option board provides an isolated 0-10 Vdc voltage signal to drive a chart recorder, plus an isolated 0-20 mA or 4-20 mA current signal for transmission to a computer or central control room. This option is compatible with all Micro meters and counters, and turns these into highly accurate, sourcing, 4-wire transmitters. The output for thermocouples, RTDs and custom curves is linearized to the displayed reading.

A 12-bit D-to-A converter provides .025% resolution. The update rate is a fast 56/s at 60 Hz power or 47/s at 50 Hz power. The analog output can track the unfiltered signal for fastest response, or the digitally filtered signal for best noise rejection.

Scaling of the output is easily entered via front panel pushbuttons or via the serial digital interface. The displayed readings to produce the low and high analog outputs may be set to any value from -99,999 to +99,999 for DPMs, or -999,999 to +999,999 for counters.

Both the current (0-20 mA or 4-20 mA) or voltage ( 0-10 V) outputs are available at the same time, and the same scaling applies to both. The output selected in software is calibrated to 99.9% accuracy. The non-selected output is accurate to 98%.

Isolation is provided by a separate on-board power supply, which is powered by the meter. This supply can drive 20 mA current into loads up to 600 ohms, for 12 V compliance. Isolation to signal ground and power ground eliminates problems caused by ground loops.

The addition of the analog output option turns Micro temperature meters into superb, isolated, linearized, 4-20 mA temperature transmitters with exceptional accuracy and high-speed response.

Provided by meter
Filtered or unfiltered digitized signal
Linearized to display
( 0-20 mA or 4-20 mA ) and 0-10 Vdc
12 V ( 0-600 ohm load )
2 mA ( 5 kOhm min load
Safety-rated to 250 Vac, 4.2 kVp per High Voltage Test
99.9% selected output, 98% non-selected output
<0.05%
12-bit ( .025% of FS )
56/s at 60 Hz power, 47/s at 50 Hz power
17 ms (unfiltered DPM)
Gate time + 30 ms + 0-2 periods (counter)

-99,999 to +99,999 (DPM), -999,999 to +999,999 (counter)
-99,999 to +99,999 (DPM), -999,999 to +999,999 (counter)
150 counts

Driving a Strip-chart Recorder

Use as an Isolated, Linearized 4-20 mA Transmitter