Beurer EM 41.1: 3.3 Pulse width 3.4 Pulse intensity 3. Current parameters 3.1 Pulse shape 3.5 Cycle-controlled pulse parameter variation 3.2 Pulse frequency

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  Do not, under any circumstances, attempt to open or repair the machine 

yourself! Only have repairs carried out by the customer service department 

or an authorized dealer. If these instructions are not heeded, the warranty 

becomes null and void. 

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  The manufacturer assumes no liability for damage caused through im-

proper or wrong use.

Information on ESD (Electrostatic Discharge)

Please note that jacks marked with the ESD warning label must not 

be touched.

ESD protective measures:

–   Do not touch plugs/jacks marked with the ESD warning label with fingers!

–   Do not touch plugs/jacks marked with the ESD warning label with hand-

held tools!

Further explanations on the ESD warning label, as well as possible training 

courses and their contents, are available on request from the customer 

service department.

3. Current parameters

Electrical stimulation machines operate with the following current settings, 

which will alter the stimulation effect depending on the setting. 

3.1 Pulse shape

This describes the time function of the excitation current.

whereby monophase pulse trains are differentiated from 

biphase. In monophase pulse trains the current flows in 

one direction, in biphase pulse trains the excitation current 

changes direction.

In the Digital TENS/EMS unit, there are only biphase pulse 

trains, as they reduce the strain on the muscle, leading to 

less muscle fatigue as well as safer application. 

3.2 Pulse frequency

Frequency indicates the number of individual pulses per 

second, and is indicated in Hz (Hertz). It can be calculated 

by working out the inverse value of the periodic time. The 

respective frequency determines which types of muscle fibre preferably react. 

Slow-response fibres tend to react to lower pulse frequencies up to 15 Hz, 

while fast-response fibres only respond to frequencies over approx. 35 Hz. 

With pulses of approx. 45–70 Hz, there is permanent tension in the muscle 

combined with premature muscle fatigue. Higher pulse frequencies can 

therefore preferably be used for elasticity and maximum strength training.

3.3 Pulse width

Pulse width is used to indicate the duration of an indi-

vidual pulse in microseconds. Pulse width also determines 

the pene tration depth of the current whereby in general, 

the following applies: a greater muscle mass requires a 

greater pulse width.

3.4 Pulse intensity

Setting the degree of intensity is individually dependent 

on the subjective feeling of each individual user and is 

determined by a number of parameters such as application 

site, skin circulation, skin thickness as well as quality of elec-

trode contact. The actual setting should be effective but should never produce 

any unpleasant sensations such as pain at the site of application. While a slight 

tingling sensation indicates sufficient stimulation energy, any setting which leads 

to pain must be avoided. 

With prolonged application, readjustment may be necessary due to time 

adjustment processes at the site of application. 

3.5 Cycle-controlled pulse parameter variation

In many cases it is necessary to cover the entirety of tissue structures at the 

site of application by using several pulse parameters. With the Digital TENS/

EMS unit, this is done by the existing programmes automatically making a 

cyclical pulse parameter change. This also prevents individual muscle groups 

at the site of application from getting tired.

With the Digital TENS/EMS unit there are useful presettings for current 

para meters. During the application, however, you do have the possibility of 

changing pulse intensity at any time and, with individual programmes, you 

can also alter pulse frequency beforehand in order implement the application 

which is the most comfortable or promises the most success for you. 

pulse  int

ensity

monophase pulses

time

biphase pulses

periodic 

time

Pulse width