A device failure goes undetected by internal diagnostics; it does not directly impact safety but it does impact the ability to detect a future fault in a diagnostic circuit. In a failure rate database, this event would be classified as:
A resistor is used in a current loop system to convert the current signal to a voltage signal that can be measured by an indicator or a controller. The value of the resistor determines the voltage range that corresponds to the current range. For example, in a 4 to 20 mA system with a 250 ohm resistor, the voltage range is 1 to 5 V, because V = IR, where V is the voltage, I is the current, and R is the resistance. What is the value of resistance?