Medical electronic stimulus generator - restricts level change to periods when output stimulus is active, avoiding excessive level settings

摘要

the electrical stimulus generator contains a voltage or current generator (1) which receives a signal (a) from waveform generator (2). The wave form determines the pulse produced by (1) in timing (on/off). The stimulus type is selectable as DC or AC of varying frequency, and either constant voltage of constant current. The amplitude of the stimulus is determined by UP/DOWN counter (4) and D/A converter (3). The amplitude is varied by UP/DOWN push buttons (7) generating signals (g, h) which are gated with signal (f) from the wave form generator (2) while a stimulus is active, a STOP button (8) resets the amplitude to zero. ADVANTAGE - Varying output stimulus level only while it is active avoids setting excessive stimulus level.