The Model 300-211 - EKG Amplifier Module is a state-of-the-art
featuring protected high impedance buffered inputs. In addition to the RA ( right
arm), LA (left arm) and LL (left leg) inputs, there is an Right Leg Ground Driver.
The Ground Driver provides active noise suppression of low frequency interference
signals by forcing the RL to ground reference potential. If the subject is accidentally
exposed to a lethal voltage level, the RL Ground Driver appears as a high
impedance and blocks the flow of a lethal current.
The input buffer outputs are connected to a Wilson summing matrix which combines
the three basis electrical signals into leads I, II, II, aVR, aVL and aVF, as selected
on a front panel rotary switch. The heart of the system is a precision instrumentation
amplifier which has very high common mode rejection to minimize the amplification
of noise pick-up.
The unit also features an Automatic Zero suppression circuit. Any one of three
different zero-level restoration time-constants may be selected on the front panel:
Slow, Medium and Fast. These may be thought of as Diagnostic, Monitor Mode
and Quick Restore, respectively. The module also has a spring loaded front panel
Calibrate Button which causes a 1mv pulse to be superimposed onto the output
The noise suppression characteristics of this module are further enhanced by the
inclusion of two stages active notch filter. These narrow stop-band filters provide
40 dB suppression at the line frequency and it's second harmonic. An internal switch
selects 50 or 60 Hertz line frequency operation.
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