Instrumentation for DC and Low-Frequency Electric-Field Measurements on ISEE-A

The double-probe floating-potential technique is applied using long-wire antenna-probes with an effective electric-field baseline of 179 meters. 14-bit A/D conversion is used for the prime dc-field measurements. An 8-channel spectrometer is used for ac-field measurements over the range 0.19 to 1900 Hz.