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The Compact High Energy Camera (CHEC) is a camera design for the Small-SizedTelescopes (SSTs; 4 m diameter mirror) of the Cherenkov Telescope Array (CTA).The SSTs are focused on very-high-energy $\gamma$-ray detection via atmosphericCherenkov light detection over a very large area. This implies many individualunits and hence cost-effective implementation. CHEC relies on dual-mirroroptics to reduce the plate-scale and make use of 6 $\times$ 6 mm$^2$ pixels,leading to a low-cost ($\sim$150 kEuro), compact (0.5 m $\times$ 0.5 m), andlight ($\sim$45 kg) camera with 2048 pixels providing a camera FoV of $\sim$9degrees. The electronics are based on custom TARGET (TeV array readout withGSa/s sampling and event trigger) ASICs and FPGAs sampling incoming signals ata gigasample per second, with flexible camera-level triggering within a singlebackplane FPGA. CHEC is designed to observe in the $\gamma$-ray energy range of1$-$300 TeV, and at impact distances up to $\sim$500 m. To accommodate this andprovide full flexibility for later data analysis, full waveforms with 96samples for all 2048 pixels can be read out at rates up to $\sim$900 Hz. Thefirst prototype, CHEC-M, based on multi-anode photomultipliers (MAPMs) asphotosensors, was commissioned and characterised in the laboratory and duringtwo measurement campaigns on a telescope structure at the Paris Observatory inMeudon. In this paper, the results and conclusions from the laboratory andon-site testing of CHEC-M are presented. They have provided essential input onthe system design and on operational and data analysis procedures for a cameraof this type. A second full-camera prototype based on Silicon photomultipliers(SiPMs), addressing the drawbacks of CHEC-M identified during the firstprototype phase, has already been built and is currently being commissioned andtested in the laboratory.

Characterisation and Testing of CHEC-M - a camera prototype for the Small-Sized Telescopes of the Cherenkov Telescope Array