Compaq user manual MTEK6000 Analog Output Specifications

MTEK6000 SERIES USER'S MANUAL

MTEK6000 ANALOG OUTPUT SPECIFICATIONS

Environmental	-30°C to + 70°C
Operating Temperature
or	-22°F to 158°F
Operating Humidity	0 to 95%
	noncondensing

Electrical Isolation

500 V DC or AC RMS (sine wave) between digital interface and 4-20 mA loop.

Current Loop Output
Maximum Output Current		24mA
Minimum Output Current		3.5mA
Maximum Supply Voltage		50V
Minimum Supply Voltage		8V
Resolution	16 bits, 0.00024 mA
Full Scale %Error		±0.01% max
(software calibrated at
4 and 20 mA and tested
at room temperature)
Temperature Drift	±0.00044 mA/°F
max
Error caused by RFI	<1% of span shift
	with 2.8W 150MHz
	applied at 1.7’

Installing the Analog Output Loop

A ribbon cable connects the AO module to the display / analog board. Commands are sent to the module via the cable by the MTEK6000 device. The 4-20mA current loop is a simple two-wire connection. +24 volts DC nominal is connected to the “+” terminal (pos. 1) and the “-”, or return terminal (pos. 2), is connected to the field instrument to which the 4-20mA signal is being sent.

Calibrating the Analog Output

Several features make the Analog Output software calibration routine attractive and more intuitive. In the MTEK6000 device, unit calibration can be software-based; there is no need for laborious operator adjustments. Software calibration does

January 2002

away with the need for repetitive

potentiometer adjustments, thereby simplifying field calibration procedures. The display / keypad or Meter Reader Virtual Keypad software are necessary to perform software calibration.

NOTE

Pressing esc repeatedly from anywhere within the calibration procedure will back the operator out of calibration mode.

1.Display the Analog Output parameter on the inside display. The common function key assignment for Analog Output #1 is F6, and F7 for Analog Output #2.

2.Press cal. Enter your password at the optional PASSWORD? prompt, if required.

3.The unit will enter calibration mode and the display will show the current value and mA representation of the analog output signal. For example,

Eng: 48.000

mA: 11.680

where 48.000 is the analog output reading representing 11.680 mA. The top line will alternate between four different readouts

Eng: 48.000, UP/DN TO CHANGE, CALIBRATING, and the parameter label (Analog Output #1 in this case), while the bottom line will always show the mA value.

4.Connect a multimeter in series with the loop to measure the current. The field instrument which the loop is driving can also be used to read the output if desired.

5.Pressing ↑ will increment the output current to represent 0%, 25%, 50%, 75%, & 100% of the analog output parameter to check the calibration. Pressing ↓ will decrement the output current.

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