Weidmuller TWI-1 - Signal isolator in 2-wire design, 1-channe Uživatelský manuál stáhnout pdf (Strana 12)

• Calibration

General

All instruments are fully calibrated before leaving the factory and

should not need adjustment until the next scheduled calibration.

Equipment requirements

• A suitable signal source (mA or V) for the inputs

• Two accurate digital multimeters (accurate to 0.05 mV and ±0.1 A)

• A suitable regulated power supply, e.g., RPS/240 V AC/24 V DC/x

• Flat bladed screwdriver (blade width less than 2.54 mm/0.1 inch)

Digital multimeters are frequently better at measuring voltages than

currents, so you may wish to measure the voltage across an accurate

standard resistor (say 10 Ω ±0.05 %) when monitoring current signals.

If you have a Mann Industries Portacal 1000 calibrator you will not

need the second multimeter or the regulated power supply.

Terminal connections for calibration

Model Number Cat. No. Channel Signal Signal type Terminal

TWI-1/4-20 mA 7940010159 One

4-20 mA input

DC milliamp source + 1

DC milliamp source − 3

4-20 mA output

mA output + 4

mA output − 6

TWI-1/0-10 V 7940011660 One

0-10 V input

DC Voltage source + 1

DC Voltage source − 3

4-20 mA output

mA output + 4

mA output − 6

Note: check all connection details against the instrument top label.

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Weidmuller TWI-1 - Signal isolator in 2-wire design, 1-channe Uživatelský manuál Strana 12