59
Intensity Resolution
0.1/0.02mA
Stimulus Duration
20µs – 1ms
Safety Features
Power Limitation, Power Up Test
Max. voltage: 400V+/-10%
Max. mean current: 2.5mA+/-10%
Max. DC Component
Duration x Frequency x Current
Stimulus Polarity
Positive, negative and biphasic stimulation.
Overload Safety
The output voltage is limited by the mean current as show on the table
below.
Mean current
[mA]
Output voltage U
[Volt]
Power
[W]
Min
Max
Max
0.1 360
440
0.044
1.0 320
400
0.4
1.4 210
330
0.46
1.8 160
240
0.43
2.2 60
140
0.31
2.6 0
80
0.26
NOTE
As it can be seen from this table, the mean output power is always below 0.5Watt.
With a given output voltage U and a load resistance R the peak output current is limited to Max output current = U
/ R. The load resistance is the sum of the two electrode impedances.
Example 1:
Stimulation frequency 20Hz, pulse duration 1mSec, current setting 50mA: this gives a mean current
20*0.001*50mA= 1mA. This cause an output voltage of maximum U = 320V. This means that output current may
be limited for R > 320V/50mA = 6.4kOhm.
Example 2:
Stimulation frequency 5Hz, pulse duration 0.2mSec, current setting <100mA: this gives a mean current
less than 5*0.0002*100mA = 0.1mA. This cause an output voltage of maximum U = 360V. With a load resistance of
<3.6kOhm the full 100mA can be delivered without limitation.
Auditory Stimulator
Stimulus Shape
Clicks, Tone, Burst, Pips, Half Sine, Full Sine
Click
50 – 100µs
Max. Intensity
Software dependent: 132dB peSPL (1.0dB Steps)
Masking Level
15 to 99dB peSPL
Visual
Stimulator
Pattern Type
Checkerboard, horizontal bars, vertical bars
Sizes
3x4, 6x8, 12x16, 24x32, 48x64, 96x128
Patient Safety
Isolation between mains and patient-
applied parts
> 4kV −
Complies with IEC/EN 60601-1, type BF specifications.
Environmental Limits
Operating
Temperature: +10° to +40°
Relative humidity: 20% to 80% (non-condensing)
Altitude: -15m to 3,000m
Pressure: 700 hPa to 1060 hPa
Storage
Temperature: -40° to +65°C
Relative humidity 10% to 100% (non-condensing)
Altitude: -15m to 10,600m
