Potomac Instrument, based in Silver Spring, MD, is a leading provider of precision survey instrumentation for measuring electromagnetic field strength. Their PI 4100 Medium Wave Field Strength Meter is a third-generation device that allows for direct measurement of the field strength within the frequency range of 520 kHz to 5.1 MHz.
Additionally, Potomac Instrument offers the SD-31 Frequency Synthesizer-Detector, which combines a high-output crystal signal generator with a sensitive detector for RF bridge measurements of AM antenna impedance. Their 1900 Series Digital Antenna Monitors provide AM broadcast antenna control measurement circuitry for up to 12 towers, featuring digital display, local operating controls, and remote control interface.
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