To simulate an RTD input, you use a:

To simulate an RTD input, you use a:

• A. Digital VOM.
• B. Potentiometer.
• C. Resistance decade box.
• D. Wally box.

Answer: (C)

Simulating an RTD input means presenting a known resistance to the measurement device so it reads as if an RTD were connected. An RTD is basically a resistor whose value changes with temperature, so to mimic its signal you provide a precise resistance value corresponding to the desired temperature. A resistance decade box is designed for this purpose: it lets you select fixed, well-defined resistance values across a wide range in quick, repeatable steps. This makes it ideal for simulating RTD readings (for example, setting a value around 100 Ω to represent 0°C for a PT100, or other values to represent different temperatures). The other options don't fit as well. A digital volt/ohm meter is used to measure resistance, not to generate a test resistance for simulation. A potentiometer can vary resistance but isn’t precise or stable enough to accurately represent specific RTD values. A Wally box isn’t a standard instrument for RTD simulation.

Simulating an RTD input means presenting a known resistance to the measurement device so it reads as if an RTD were connected. An RTD is basically a resistor whose value changes with temperature, so to mimic its signal you provide a precise resistance value corresponding to the desired temperature.

A resistance decade box is designed for this purpose: it lets you select fixed, well-defined resistance values across a wide range in quick, repeatable steps. This makes it ideal for simulating RTD readings (for example, setting a value around 100 Ω to represent 0°C for a PT100, or other values to represent different temperatures).

The other options don't fit as well. A digital volt/ohm meter is used to measure resistance, not to generate a test resistance for simulation. A potentiometer can vary resistance but isn’t precise or stable enough to accurately represent specific RTD values. A Wally box isn’t a standard instrument for RTD simulation.