Determining total current draw, in a system running multiple sensors

Irving said:

My domestic freezer gets down to -18C. I've used that to validate cold operation on the grounds that the 'real thing' will actually be encased in some heavy insulation and warmed slightly by its residual operating heat

Many moons ago I used to be part of a design team on ground-to-air comms for fighter aircraft - designing high power transmitters and sensitive receivers that worked reliably over an operating range exceeding -55C to 125+C (the former being a shutdown fighter on an arctic airstrip in a blizzard (can be colder) and the latter being the same fighter on a desert airstrip in full sunlight with the engines running - the radio bay being located in the top of the fuselage above and between the engines - not the best choice but thats where the iairframe designer put them! Fortunately we had that equipment; unfortunately we also had to do field validation!

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