What should I document so EMF results are defensible?
Document the instrument and probe model, frequency range, measurement locations, distance from source, probe height, and whether the reading is time-averaged or a peak. Without that context, EMF numbers are hard to interpret later.
How do I decide where to measure in a facility?
Measure where people actually work (workstations, walk paths, maintenance positions) and near the highest field areas (close to transformers, VFD panels, bus ducts). The goal is to characterize exposure, not just find the absolute maximum.
When should I use a broadband EMF meter instead of an RF-only meter?
Use a broadband EMF meter when you need to assess both low-frequency fields (power lines, motors, transformers) and high-frequency RF fields (antennas, wireless devices) in the same survey, or when the specific source frequency is unknown and you need a general-purpose assessment. Use an RF-specific meter when your sources are known RF emitters and you need frequency-selective measurements or directional information.
What commonly causes misleading EMF conclusions?
The most common causes: using a broadband meter that can't distinguish frequency, then comparing the result to a standard that applies only to a specific frequency range. Also common: measuring peak field levels near a source and comparing to whole-body average exposure limits, which are not directly comparable. Not accounting for distance falloff, not identifying all contributing sources in the area, and using a meter that isn't appropriate for the frequency of the source being measured are also frequent problems.
When does probe orientation and measurement technique matter most for EMF surveys?
Always — but especially near directional sources, in tight equipment rooms, and when results will be compared to exposure limits. Small changes in distance, height, and probe orientation can substantially change readings, so repeatable technique is essential for results that hold up in a report.
What's the key decision before renting an EMF meter setup?
Decide what sources you're evaluating (power equipment, RF transmitters, or both), what frequency range matters, and what standard you're reporting to. That determines probe selection and whether you need separate measurements for electric field versus magnetic field.
