EMPI Active
User Guide
EMPI Active
User Guide
17
Technical Specifications
Simple Modulated Pulse (SMP) Waveform
As shown in
Figure 9
, the output of the Empi Active device is a patented
asymmetrical Simple Modulated Pulse (SMP) waveform designed to maximize pain
relief. SMP delivers a group of pulses as a repeating 12-second cycle. Within each
cycle, the rate and duration of the pulses vary.
Standard Measurement Conditions
23°C, 1 k ohm resistive load, 4.2V d.c. supply voltage.
Standard Measurement
Pulse Duration
Pulse duration is adjustable and determined by the intensity setting. Range is 48 to
400μs at 50% peak amplitude.
Maximum Current
Absolute average value:
10 mA into 500 ohms
Root Mean Square:
10 mA into 1k ohm
Electrode surface area:
1.2 in
2
(7.9 cm
2
) minimum area recommended.
Type BF Applied Part
Internally powered only.
Ordinary protection against entry of liquids.
Continuous operation.
Asymmetrical Waveform
Empi Patented Waveform
Figure 9:
Asymmetrical Waveform
* Vpp = Volts peak to peak
** Ipp = mA peak to peak
Technical Specifications
continued
Modulation Characteristics
As illustrated in
Figures 10
and
11
, the output of Empi Active is a balanced
asymmetrical biphasic waveform that has nominally constant voltage in the positive
phase and nominally constant current in the negative phase over the AAMI load range
of 200 to 1k ohms with a 20% tolerance.
Physical Dimensions
Approximate Weight
0.99 oz. (28.3 grams)
Environmental Requirements
Operating Temperature Range:
50° F to 104° F (10° C to 40° C)
Atmospheric Pressure Range:
50 kPa to 106 kPa
Relative Humidity Range:
30% to 75%
Transport and Storage Requirements
Temperature Range:
-40° F to 158° F (-40° C to 70° C)
Atmospheric Pressure Range:
50 kPa to 106 kPa
Relative Humidity Range
: 10% to 90%
Figure 10:
Rate Modulation
125pps
2pps
12sec
12sec
Rate Modulation
(pulses per sec)
Figure 11:
Duration Modulation
Duration Modulation
100%
4sec
4sec
60%
12sec
12sec
Inches
Centimeters
Height
1.94
4.92
Length
2.54
6.45
Width
0.57
1.44
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