Hardware Version

Version Used During the Apollo Missions

The ECG Signal Conditioner was a component of the Bioinstrumentation System that was used for in-flight monitoring of crew health. The ECG signal conditioner and electrodes were designed to provide in-flight measurements of the heart's electrical conductance and to develop a signal wave ranging between 0 and 5 volts peak-to-peak, which are representative of crewman ECG activity. The unit was provided with an adjustment that permitted preflight calibrations. The electrical activity sensed by the body electrode was passed to the signal conditioner that had input impedance greater than 40 megohms and a common mode rejection greater than 100,000 to 1. The gain of the signal conditioners was continuously variable from 600 to 4500, and the output was the amplified ECG waveform that varied ±2.5 volts about a 2.5-V bias. Harmonic distortion was less than 1 percent over the unit's frequency bandpass of 0.2 Hz to 100 Hz. A signal conditioner power of ±10 VDC at 0.5 milliamperes was required from the DC to DC converter.

For the Apollo 15 through 17 missions, the two-lead ECG was replaced with a modified Frank lead vectorcardiograph (VCG).

Experiment Participation
Skip to page content Experiment + Clinical Aspects of Crew Health   (AP001)

Mission Participation
Skip to page content Experiment +Apollo 10   (Apollo 10)
+Apollo 11   (Apollo 11)
+Apollo 12   (Apollo 12)
+Apollo 13   (Apollo 13)
+Apollo 14   (Apollo 14)
+Apollo 15   (Apollo 15)
+Apollo 16   (Apollo 16)
+Apollo 17   (Apollo 17)
+Apollo 7   (Apollo 7)
+Apollo 8   (Apollo 8)
+Apollo 9   (Apollo 9)