Practical-instrument-electronics 850 Manual de usuario descargar pdf (Pagina 15)

Page 13

Preliminary

10-50 mA Operation - The 10-50 mA control signal predated the

now common 4-20 mA signal. Many loops with 10-50 signal

have power supplies that run higher than 24 V DC.

SOURCE supplies from 0.000 to 52.000 mA with up to 40 V

DC compliance which has enough power to stroke valves.

2-Wire Transmitter Simulation limits the loop current passing

through it in the same manner as a 2-Wire transmitter with

loop power supplies up to 60 V DC.

READ measures from 0.000 to 52.000 mA from mA outputs

of controllers or to monitor the signal in a loop.

PWRM is POWER MEASURE which uses the internal loop

supply of the 850 to power up the transmitter while indicating

the current passing through the loop proportional to the input

of transmitter which is controlled by the output of the 850.

Operating Instructions

When simulating a 10-50 mA

2-Wire Transmitter in loops

with high voltage this section

of the calibrator may get

warm.

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