Weidmuller Portacal 275 - Signal source and loop calibrator Manual do Utilizador descarregar pdf (Página 10)

• Description

The Portacal 275 is an accurate, handheld, signal source and loop

tester for milliamp, millivolt and voltage signals. It can be used in four

modes:

• voltage source, which simulates auxiliary powered transmitters with

proportional voltage outputs;

• millivolt source, which simulates many common plant based signals;

• current source, which simulates auxiliary powered transmitters with

proportional current outputs;

• current sink mode,

which simulates 2-wire (loop powered) transmitter

outputs.

The Portacal 275 has an accurate lockable dial scaled in 0.1 %

increments from 0 to 100 %. By using the dial in combination with the

output value switch, you can quickly and accurately (typically within

0.25 %) dial up any signal value in the field without a digital meter for

indication. For more accurate bench work (to within ±0.1 %) you can

measure the outputs with a multimeter.

Current sink mode (simulates 2-wire transmitter operation)

1. Select sink mode with ‘source/sink mode’ lockable switch.

2. S

elect 0-20 mA or 4-20 mA range.

3. Set the ‘voltage/millivolt select’ switch to the 0-200 mV position.

4. Connect the instrument up as shown above.

To monitor the output, connect a multimeter across V+ and V-. The

oltage terminals will output 0-200 mV for 0-20 mA.

To increase the loop load by 250 Ω, put the Voltage/millivolt switch in

the 0-5 V position.

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Weidmuller Portacal 275 - Signal source and loop calibrator Manual do Utilizador Página 10