Abstract
Measurements were made of the characteristics of the Gatan PEELS system, to evaluate how this parallel-recording spectrometer can be used to best advantage. An increase in sensitivity at higher signal level is attributable to the electronics and can be largely removed by a minor modification to the circuitry. The signal/noise ratio and DQE can be understood only if explicit allowance is made for the point-spread function of the detector. DQE is found to exceed 0.1 over a limited range of signal intensity. The stray-scattering background, response time of the detector and other spectrometer properties have also been measured.
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