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GM304
2 CH IF, TENS and EMS combo 3 ( Interferential, Transcutaneous and Powered Muscle Stimulator Combo)
The GEM-STIM combo 3 Series is a professional dual-channel TENS/EMS/IF stimulator designed for pain management and rehabilitation applications. It is available for OEM manufacturing and private label branding to meet diverse market requirements.
This series of devices is a combination of IF, TENS, and EMS with a two-channel electric stimulator for active treatment application, which is equipped with a Liquid Crystal Display indicating operation modes and parameters as well as an 8-bit microcomputer for controlling the system.
GM304

TECHNICAL SPECIFICATIONS FOR “IF” (Interferential)
- Channel: two, isolated between channels
- Pulse intensity: Adjustable 0-90mA peak into 500 ohm load each channel, constant current
- Carrier Frequency: 4000Hz fixed (CH1)
- Modulating Frequency: 4004-4160Hz Adjustable (CH2)
- IF Frequency Mode: Constant Mode (C): 4-160 bps, Adjustable. Auto Sweep (A): 80-145 bps, 4-45 bps, 4 Set bps. Frequency Shift (S): 1/1 abruptly shift, 6/6 abruptly shift, 6/6 ramped, 10/10 abruptly shift, 10/10 ramped
- Sweep Time:15 seconds
- Frequency Shift Percent: Frequency shifts from 30% below set frequency to 60% above and returns to 30% below set.
- Output Configuration: Quanta polar (4 electrodes)
- Waveform: Symmetrical balanced Sine wave
- Interference Pulse Freq: 4-160 bps, Adjustable 4 bps/step
- Pulse Duration: 125μs maximum
- Patient Compliance meter: Shows the treatment times, counted by minutes
- Patient Lock: Prevents the patient from changing any of the parameters set by the physician/practitioner.
- Timer: 15 or 30 minutes selectable
- LCD: Shows ,modes, bps rate, abrupt/ramp, timer and channels.
- Max charge per Pulse: 22.5 Micro-coulombs Maximum
- Power Source: 9V battery or 9-Volt adaptor
- Tolerance: Except intensity with +/-20%, all others with +/-10%
**** bps: number of beats per second
TECHNICAL SPECIFICATIONS FOR "T/E" (TENS and EMS)
- Channel: two, isolated between channels
- Pulse amplitude: Adjustable 0-80mA peak into 500 Ω load each channel, constant current
- Pulse Rate:1Hz-160Hz (adjustable), 1Hz/step
- Pulse Width:50 - 260μs adjustable for TENS; 300μs fixed for EMS.
- Software ramp-up feature: Pulse width ramps up when changing mode
- Patient Compliance meter: Shows the treatment times. Accounted by minutes.
- Timer:15, 30, 45, 60 minutes or Continue selectable
- LCD: Shows modes, pulse rate, on/off /ramp time, timer, CH1/CH2.
Function Modes:
TENS:
B: Cycle Bursts, 2Bursts/sec, 9pulses/Burst, 100Hz, width is adjustable.
C: Continuous mode. Pulse rate pulse width, and intensity are full adjustable.
M: Modulated Width. Pulse width is automatically varied in an interval of 6 seconds. The modulation range of pulse width is from the setting value to 35% less than the control setting value. And then returns to the setting value. Rate, width, and intensity are fully adjustable.
H1 (MR): Modulated Rate. Pulse rate is automatically varied in an interval of 6 seconds. The
modulation range of pulse rate is from the setting value to 35% less than the control setting
value, then returns to the setting value.
H2 (MRW): Modulated Rate/width. Pulse rate and width are automatically varied in an interval of 6 seconds. The modulation range of pulse rate and width is from the setting value to 35% less than the control setting, then returns to the setting value.
EMS:
S: Synchronous.
C: Constant.
A: Alternation.
- ON Ramp: Adjustable 1-8 seconds. 1sec/step.
- Cycle ON Time: Adjustable 1-30 seconds. 1 sec/step.
- Cycle OFF Time: Adjustable 1-30 seconds. 1 sec/step.
- Function Modes: S: Synchronous. C: Constant. A: Alternation.
- Wave Form: Asymmetrical Bi-Phasic square pulse.
- Max charge per pulse: 21 micro-coulombs for TENS; 24 micro-coulombs for EMS.
- Voltage: 0-110 volts (Open Circuit).
- Power Source: 9V battery or 9-Volt adaptor
- Except intensity with +/-20%, all electrical specifications are ±10% 500Ω load.
- Dimension: Approx. 128 x 70 x 26 mm
- Weight: Approx. 175 g (with battery)
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