Two samples were obtained from each donor: one was subjected to infrasound for 60 min and the other served as a control. Methods: Human myocardial tissues, obtained from patients undergoing cardiac surgery, were prepared in small muscle samples and stimulated electrically in-vitro for a period of almost two hours under physiological conditions to induce continuous pulsatile contractions and simulating a working human heart. Setting: The University Hospital of Mainz, Germany. Aims: To evaluate whether exposure to infrasound interferes directly with human cardiac function and contributes to pathological processes. The concern among the public regarding the safety of infrasound exposure is growing. Ryan Chaban 1, Ahmed Ghazy 1, Eleni Georgiade 2, Nicole Stumpf 1, Christian-Friedrich Vahl 1ġ Department of Cardiothoracic and Vascular Surgery, University Hospital of Johannes Gutenberg University Mainz, Mainz, Germany 2 Faculty of Medicine, University of Mainz, Mainz, Germanyīackground: Human exposure to infrasound is increasing due to man-made factors, such as occupational conditions, wind farms and transportation. If the sound is weak, with only high frequencies, then pin 3 needs to be tied to pin 1 (ground).Negative effect of high-level infrasound on human myocardial contractility: In-vitro controlled experiment If they don't then the safest is to leave pin 3 (jack ring) floating, and if that works, then great.
#Truerta a weighting how to#
In many cases, the manual will tell you how to unbalance the output. In summary, it's impossible to know what's the right way unless you know what sort of output you have. If the output isn't differential, just impedance balanced, then shorting pin 3 (jack ring) to ground should be fine assuming the sensible case that it's pin 2 that actually carries the signal.
#Truerta a weighting series#
Usually each opamp has a series resistor to protect the output against just such an occurrence, but that raises the output impedance from essentially zero ohms to 75-100 ohms so sometimes isn't done.
with an opamp on each leg, then it's not OK as one leg will be shorted to ground. If the output is just plain electronically balanced, i.e. not ground referenced, so shorting pin 3 (jack ring) to ground is fine. If the output is electronically servoed, then it's effectively 'fully floating' i.e. However, most outputs these days are not transformer balanced, but use electronics. Pin 3 needs to be left unconnected in this case. If centre-tapped transformer balanced that's not fine at all as half the transformer gets shorted out. If fully floating transformer balanced, that perfectly fine.
Unbalancing a balanced differential output by shorting XLR pin3 (jack ring) to ground is fine or not, depending on the type of balanced output. This is the connection that isn't connected to an active op-amp rather just resistance coupled. One will read a moderately low and fixed unchanging resistance. One will read a rather high and possibly fluctuating resistance.
With power off using a TSR cable check resistance between the sleeve to the tip and the ring. I don't know about the gen 3 Scarletts, but earlier generations were impedance balanced and shouldn't be bothered with pin 3 grounded. My apologies if this has been covered as I didn't read all 7 pages.
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