This question applies to the legacy Photon camera models. The Photon product line and its accessories have been discontinued. The information here is provided for historical reference.
FLIR / Indigo does not make any specific claims about EMI with respect to the Photon 320 or lower resolution versions of Photon. Photon exhibits an EMI `spike` at about 290 MHz. The standard rear cover does not mitigate Photon`s EMI emission.
There is (was) an optional rear cover available for Photon 320 and lower resolution versions of Photon that, with appropriate grounding, cable shielding, and power considerations, mitigates the resulting radiated EMI emissions to near-CE class A performance levels (~0dB margin). The Photon 320 EMI Rear Enclosure Assembly part number is 500-0312-00. This accessory includes a circuit board that must be installed onto the power conditioning board, resulting in an increase to the overall camera length of about 3/8`. The power dissipation of the camera increases by a negligible amount, approximately 0.05W with the EMI rear cover installed.
Photon 640 implemented EMI reduction by way of an adapter board that included an embedded 26-pin adapter and rear cover. The Photon 640 EMI Rear Enclosure Assembly part number is 421-0028-00. This accessory includes a circuit board that is installed onto the power conditioning board, resulting in an increase to the overall camera length of about 11/32” or 1.5 cm. The power consumption of the camera with or without the EMI board depends on input voltage. As a general estimate, the EMI board uses about 50mW additional power.The Photon 640 EMI Rear Enclosure is also required for compatibility with the Photon 640 Ethernet Module accessory.