Premodulated Current is a medium frequency waveform. Current comes out of one channel
(two electrodes). The current intensity is modulated: it increases and decreases at a regular
frequency (the Amplitude Modulation Frequency).
Carrier frequency:
Carrier frequency is the base frequency of the alternating current.
Beat Frequency:
The frequency at which the amplitude is modulated. This is the effective
therapeutic frequency.
Vector-Auto:
Vector-Auto is a form of amplitude modulation and is a percentage of the
interferential amplitude (intensity) and will decrease from its maximum level over 6 seconds.
Vector-Manual
：
Vector-Manual is a form of amplitude modulation. When Vector-Manual
set to a different Angle, the output intensities of two channels are different. The rhythmical
varying of the current amplitude of each channel produces the perceived movement of the
interferential field by the patient.
17
4.1.3.2 IFC(Interferential) Premodulated (2 Pole)
Parameters:
Carrier frequency:
Carrier frequency is the base frequency of the alternating current.
Beat Frequency:
The frequency at which the amplitude is modulated. This is the effective
therapeutic frequency.
Cycle Time:
refers to the time that the current is On and Off (in seconds). Example: for a
Cycle Time of 10/50, the current will be flowing for 10 seconds and resting for 50 seconds.
Ramp Time:
the time that the current will take to increase to the set intensity level. Ramps
occur at the beginning and ending of a timed On cycle.
Parameters:
The Asymmetrical Biphasic and the Symmetrical Biphasic waveform are often used in TENS
(Transcutaneous Electrical Nerve Stimulation) applications. The TENS has a short pulse
duration. It is capable of strong stimulation of the nerve fibers in the skin as well as of muscle
tissue. Because of its short pulse, the patient typically tolerates the current well, even at rela-
tively high intensities. The Alternating Rectangular waveform is an interrupted biphasic
current with a rectangular pulse shape. This waveform is commonly used as a pain manage-
ment application.
4.1.3.3 Biphasic
（
TENS
）
Rehab-Series
