MEMORY OSCILLOSCOPE  MODEL 1740A
HIPPO
CH1heartbeat12 bpm
CH2decayhalf 30s
CH3activityquiet
VOLTS/DIV 1.0

TIME/DIV 500ms

TRIG AUTO
MEMORY 60 Hz LINE::MEAN 0.84V::PEAK +2.1V / -0.3V
LOCKED
T+000.0s SWEEP A BEAM ON