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Simulator
Operation
The Simulator is powered by a 9V internal battery. The power switch on the front panel
activates the ECG and Respiration waveform. Green LEDs flash with the heart QRS
and with respiration. A yellow LED flashes when the internal battery is low. Separate
controls are provided for ECG rate and amplitude and respiration rate and amplitude. In
addition the width of the respiration pulse can be controlled as can the slew rate for the
rise and fall of the ECG waveform.
ECG rate:
ECG amplitude
Respiration rate
Respiration amplitude
Turning on the power switch to the gradients, superimposes gradient spikes on the
ECG/respiration waveform. The gradient spike width and duty factor are controlled by a
rotary switch with 3 positions while the spike amplitude is controlled by the amplitude
knob and a small/large gradient switch.
The waveform shown on the next page was obtained with the switch at position 1 and
maximum gradient amplitude.
baseline, however the R-wave amplitude decreases by about 15% during maximum
gradient activity.
The ECG CAL switch generates an 0.8 mV QRS complex at 200 beats per minute.
5-2
30 - 700 beats per minute
0.25 - 2.5 mV
60 - 300 breaths per minute
0.0 - 0.50 mV
Note the lack of gradient interference on the ECG
Revision C, August 2013
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