Time-electronics 1048 Voltage-Current-Loop Calibrator Manual de usuario descargar pdf (Pagina 8)

V1.2 30/12/10 Page | 8 1048 Technical Manual

3.3. Measure – Current

The unit measures current in three selectable ranges, 0 to 0.22mA (displayed in uA), 0 to

2.2mA and 0 to 22mA (plus over-range to 70mA).

SPECIAL NOTE: Although the top range is nominally 22mA span, it can be safely

used to measure current up to 70mA.

• Set Function switch to MEAS

• Set OFF/V/mA switch to mA

• Set Range switch to the desired range

• Set Output switch to NORM

• Connect the unit to the signal source observing correct polarity, the current will be

displayed with 3.5 or 4.5 resolution - see Section 3.1.1.

Connect the unit to the sensor or

transmitter observing the correct polarity.

The current drawn is displayed.

3.4. Power and calibrate - transmitters/sensors

If the loop’s power supply is not available it is possible to use the unit’s internal 22V supply

to power the loop. Set up the unit as described below.

• Set Function switch to SRC

• Set the Multi-Turn Output Control fully clockwise.

• Set OFF/V/mA Switch to mA

• Set Range switch to the desired range

• Set Output switch to NORM

Connect the unit to the sensor or transmitter

observing the correct polarity.

The current drawn is displayed.

Measure Mode

Sensor

- +

Pow er Suppl

2 w ire transducer/transmitter

Sensor

Measure & Power Mode

2 w ire transducer/transmitter

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 22 23

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Time-electronics 1048 Voltage-Current-Loop Calibrator Manual de usuario Pagina 8