| Standards |
IEC 60601-2-26 (Electroencephalographs).
IEC 60645-1/ANSI S3.6 (Audiometers).
IEC 60645-3 (Auditory test signals) |
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| Pre-Amplifier |
Two channels (standard) EPA4 Cable Collector (4 electrodes). Standard 50 cm. Option: 5 cm or 290 cm
One Channel (optional) EPA3 Cable Collector (3 electrodes). 50 cm
Gain: 80 dB/60 dB
Frequency response: 0,5 – 5000 Hz
Noise: 4nV/√Hz – 0.22 μV RMS (0 – 3 kHz)
0.22 μV RMS (0 – 3 kHz)
CMR Ratio: Minimum > 118 dB. Typical 130 dB <100 Hz
Radio Frequency Immunity: Typically 25 dB improvement over previous available designs
Max input offset voltage: 2,5 V
Input impedance: 10 MΩ
Power: From main unit |
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| Impedance check |
30Hz rectangle. Impedance information for each individual electrode.
No unplugging of electrode leads required. Readout directly on Amplifier.
Measuring Current: 25uA. Ranges: 0.5kΩ -25kΩ. |
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| Frequency specific stimuli |
Tone burst: Frequencies: .5kHz to 4kHz.
Envelopes: Blackman, Gaussian, Hanning, Hamming, Bartlett, Rectangle, and manual rise/plateau/fall. |
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| Broad Band Stimuli |
Click.
Rate: 0.1 – 80.1 per sec. |
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| Intensities |
20 – 135d,5 peSPL in 1dB steps (-10 – 100dB nHL in 1 dB steps) |
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| Masking |
White noise. 0 – -40dB relative to stimulus. |
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| Quality Indication |
Response Confidence Targets of 95%, 97,5% or 99%.
Fmp calculation based on 5 points with selectable range. |
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| Residual Noise calculation |
On-line during measurement. Selectable stop criteria. 5 points calculation with selectable range. |
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| Number of channels |
2 channels. (EPA3: 1 channel). |
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| Number of curves per session |
Unlimited. |
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| Auto protocols |
Several automatic test protocols included. As many automatic tests as desired may be designed and added by operator. Manual control during automatic testing is available. |
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| Data acquisition |
Analysis time: 0-980ms window. Acquisition start: +/- 2ms from stimulus onset.
A/D resolution: 16bit. Points per trace: 450 displayed. |
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| Gain |
Automatic: Before each new intensity is tested, the best suitable gain is automatically selected. Manual: 6dB steps from 74dB to 104dB (10μV to 320μV input). |
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| Raw EEG |
Displayed online. Refresh rate: 10Hz typical. |
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| Filters |
Digital filtering for Low Pass and High Pass. Low Pass FIR filters without time shift of wave peak. High Pass fi lters analog Butterworth 0.5 to 100Hz 6/12dB octav. On the EP15/EP25 or from any reader station in a network it is possible to apply different visual filtering during testing as well as after the test is completed. |
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| Patient communication |
Talk forward. |
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| HELP |
On-line Help for buttons, entry fields etc., as well as an electronic operation manual with search functions and cross references are included. |
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| Included parts |
EP15 / EP25 Software CD
Preamplifier
ETB Standard electrode cable with buttons
ETU Universal electrode cable
ETR Electrode cable with re-usable electrodes
ETS Electrode cable spring
PEG15 Set of 25 single use pre-gelled electrodes
ETT Tip trode electrode cable set (only EP25)
TTE25 Tip trode gold electrodes 10 pcs. for ECochG (EP25 only)
20 pcs. of Infant eartip (2 x 10)
EarTone ABR Insert ear phones w/foam tips
SPG15 Tube of skin preparation gel
Ten20™ Electrode gel
Gauze Swabs
LBK15 Loop Back unit for system performance check
Alcohol pads (100 pcs.) |
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| Optional parts |
TDH39 Headset
DT48h Headset
B71 Bone conductor
EPA3 Cable collector (one channel/3 electrodes)
License for VEMP functions |
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| Transducers |
Ear-Tone ABR insert phones included.
Independent calibration for TDH39.(Optional)
Independent calibration for B71 (Optional). |
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Some of the features
