Final answer:
A digital camera can be used in a site survey to capture RF signal levels, but the accuracy of site surveys is dependent on various factors. More sensitive digital devices might improve null measurements, but factors like environmental interference and instrument precision also play significant roles.
Step-by-step explanation:
True, a digital camera may be used when performing a site survey to obtain screen snapshots of RF (radio frequency) signal levels. These snapshots can provide visual documentation of the signal strength at specific locations. However, the accuracy of RF site surveys depends on more than just the ability to capture RF signal levels visually.
Other factors that might limit the accuracy of null measurements include environmental interference, reflections, multi-path distortions, and the precision of the measuring instrument itself. While using a digital device that is more sensitive than a galvanometer could potentially improve the accuracy of null measurements, other environmental and technological factors also need to be considered. Proper calibration, understanding signal behavior, and accounting for physical obstacles are all critical to obtaining accurate RF site survey results.