Apogee Instruments SI-1H1 Owner's Manual - Page 18
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Signal Interference
Due to the small voltage signals from the detector, care should be taken to provide appropriate grounding for the
sensor and cable shield wire, in order to minimize the influence of electromagnetic interference (EMI). In instances
where SI-100 series radiometers are being used in close proximity to communications (near an antenna or antenna
wiring), it may be necessary to alternate the data recording and data transmitting functions (i.e., measurements
should not be made when data are being transmitted wirelessly). If EMI is suspected, place a tinfoil cap over the
front of the sensor and monitor the signal voltage from the detector. The signal voltage should remain stable at (or
very near) zero.