Answer / carl_ellis

The spec sheets on my desk have these specs:

for an AC voltage digital input:
2 mA nominal @ 230 VAC, 50 Hz

for a DC voltage digital input:
2.3 mA @ 12 VDC
6.9 mA @ 24 VDC nominal

for a dry contact digital input (internal 15Vdc source):
2.6 mA nominal

Interviewees should be able to convert from milliamps to amps.

Normally, power (watts) is 'consumed'.
Current (amps) is a 'draw' on the power supply.

Carl Ellis
Measure First

How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

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