This PHA monitors analog pulse inputs on the five lines D1 through D5 corresponding to particles incident on the LEPT detectors one through five. Additionally the PHA measures two DC levels shown as I alpha and I beta. The lines at the right of the PHA section are digital control and data lines interfacing with the experiment Command and Data Assembly. The PHA peak detectors are ON allowing measurement of four simultaneous detector outputs when requested by the DATA electronics.
Calibration is accomplished as desired to confirm internal operation.
The Basic PHA Refer to the Block Diagram Figure 2 and Data Timing Diagram Figure 3 . The PHA is a fully redundant unit with the exception of the Peak Detector circuits. This may be used to advantage if degradation of one PHA occurs during encounter with the Jovian magnetospheric radiation region. The operating modes for either PHA are illustrated in Figure 3 by the Table of Output Data. A both OFF condition by command is also included, providing a total of 13 different operating modes.