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This was supplied by the Rutherford Appleton Laboratory. This instrument used twin electrostatic analysers to measure the electron distribution over the energy range from 6 eV to 25 keV. It could be commanded to operate in a variety of modes, e.g. (i) a full energy scan from 12 eV to 25 keV in one second; (ii) scans from 12 eV to 25 keV and from 12 to 680 eV in alternate seconds. Unlike for the ions, there is no problem of resolving the solar-wind electron distribution since electron thermal velocities are generally higher than the bulk solar-wind velocity. Full details are available in the following paper:

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