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A transcutaneous electrical nerve stimulation (TENS or TNS) is a device that produces mild electric current to stimulate the nerves for therapeutic purposes.TENS, by definition, covers the complete range of transcutaneously applied currents used for nerve excitation, but the term is often used with a more restrictive intent, namely, to describe the kind of pulses produced by portable ...
Transcutaneous electrical nerve stimulation, or TENS, involves the transmission of electrical energy from an external stimulator to the peripheral nervous system via cutaneously placed conductive gel pads. TENS can be subclassified into two variants: low-intensity (1–2 mA), high-frequency (50–100 Hz) TENS; and
FES devices take advantage of this property to electrically activate nerve cells, which then may go on to activate muscles or other nerves. [10] However, special care must be taken in designing safe FES devices, as electric current through tissue can lead to adverse effects such as decrease in excitability or cell death.
This is distinct from transcutaneous electrical nerve stimulation (TENS), in which an electric current is used for pain therapy. "The main difference is the desired outcome. TENS unit is a medical device for pain relief. The desired outcome is to reduce pain by stimulating different nerve signals.
Manufacturers tend to be a bit coy about providing these kinds of specs for TENS units, no doubt because the measurements are hard to standardize. A few consumer units I have seen do have labels with rudimentary specs, for example "Maximum output 60v at 1000Ω" or "Current 20-100 ma at 500Ω".
Many such tests administer the induced fast transient oscillation directly, in the form of a damped sine wave, rather than attempting to reproduce the original source. International standards define the magnitude and methods used to apply them. The European standard for Electrical Fast Transient (EFT) testing is EN-61000-4-4. The U.S ...
Stifling heat blanketed tens of millions of people in United States on Tuesday, forcing people and even zoo animals to find ways to cool down as summer arrives in what promises to be a sweltering ...
Atomic clocks usually have an external PPS output, although internally they may operate at 9,192,631,770 Hz. [3] PPS signals have an accuracy ranging from 12 picoseconds to a few microseconds per second, or 2.0 nanoseconds to a few milliseconds per day based on the resolution and accuracy of the device generating the signal.
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