How can you check the loop impedance in a 4 to 20 mA loop?
A. Measure the voltage drop across the loop
B. Measure the current in the loop
C. Measure the resistance of the loop
D. Measure the frequency of the loop
Answer:C
How can you check the loop impedance in a 4 to 20 mA loop?
A. Measure the voltage drop across the loop B. Measure the current in the loop C. Measure the resistance of the loop D. Measure the frequency of the loop
Explanation: To check the loop impedance in a 4 to 20 mA loop, you can measure the resistance of the loop using an ohmmeter. Disconnect the transmitter and receiver from the loop and measure the resistance between the two wires. The typical range for loop impedance is between 250 and 1200 ohms, depending on the power supply voltage and the transmitter current range.