Auvon TENS/EMS: Pulse Waveforms

The Auvon AS8016 TENS/EMS unit produces bipolar pulses with no net DC offset, so the UI controls the negative and positive amplitudes equally. The range has 20 steps, with the screen shots here set to 10 units. The actual output voltage depends on the mode, with some modes producing a peak voltage well above the others at the same UI setting.

It’s worth noting the effect comes from current passed through skin and muscle, rather than voltage applied to it. The test setup uses a 500 Ω resistance to make the current vary linearly with the voltage (which is definitely not the case with human bodies): a 20 V pulse passes 40 mA through the resistor:

Auvon AS8016 - test setup
Auvon AS8016 – test setup

The simplest bipolar pulses always start with the negative phase. The shortest pulse width is 100 µs:

Auvon M02 Pulse
Auvon M02 Pulse

And 150 µs:

Auvon M03 Pulse
Auvon M03 Pulse

And 200 µs:

Auvon M01 Pulse
Auvon M01 Pulse

Up to 250 µs:

Auvon M06 Pulse
Auvon M06 Pulse

Some modes have a short zero-voltage pause between the negative and positive phases:

Auvon M17 Pulse
Auvon M17 Pulse

The pause can be the same duration as the negative and positive phases:

Auvon M14 Pulse
Auvon M14 Pulse

Some modes have pulses starting with the positive phase, others switch the leading phase during the course of the output modulation.

My casual survey of the consumer-grade field suggests the pulse waveform has less to do with well-tested effects and more to do with marketing or straight-up woo, but I admit to being a cynic.

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