Which of the following should you protect the infrared tester from?

• A. Water And Humidity
• B. Magnetic Fields
• C. Electromagnetic Fields
• D. Physical Shocks

Answer: (C)

Electromagnetic interference can disturb the electronics inside an infrared tester. These devices rely on sensitive detectors and processing circuitry to translate infrared energy into a temperature reading, and nearby electromagnetic fields from power equipment, switches, or RF devices can inject noise, cause drift, or produce erroneous results. Keeping the tester away from strong EM fields or shielding it properly helps maintain accurate measurements. Magnetic fields are a part of electromagnetic fields, so protecting against EM fields covers them too. Water, humidity, and physical shocks can affect equipment in other ways, but the primary concern for accurate infrared readings is shielding from electromagnetic fields.