PHYWE Cobra4 User manual

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Operating instructions
Cobra4 Sensor-Unit Electrophysiology
12673-00
PHYWE Systeme GmbH & Co. KG
Robert-Bosch-Breite 10
37079 Göttingen
Germany
Phone [phone]
Fax [phone]
E-mail [email protected]
Internet www.phywe.com
Fig. 1: 12673-00 Cobra4 Sensor-Unit Electrophysiology
The unit complies with
the corresponding
EC guidelines
TABLE OF CONTENTS
1SAFETY PRECAUTIONS
2PURPOSE AND CHARACTERISTICS
3FUNCTIONAL AND OPERATING ELEMENTS
3.1 Operating elements
3.2 Sensor interface
4NOTES ON OPERATION
5HANDLING
5.1 Putting into operation
5.2 ECG
5.3 EMG
5.4 EOG
6TECHNICAL DATA
7SCOPE OF SUPPLY
8ACCESSORIES
9WARRANTY
10 WASTE DISPOSAL
11 SYMBOL DESCRIPTION
1 SAFETY PRECAUTIONS
Do not use the Cobra4 Sensor-Unit Electrophysiology
if an attached device is connected to the mains volt-
age!
Read these operating instructions carefully and com-
pletely before putting your Cobra4 Sensor-Unit into op-
eration. Also similarly read the operating instructions for
the Cobra4 measured data recording instrument that is to
be used with the Sensor-Unit for measured value re-
cording. By doing so, you protect yourself and your
equipment.
Only use the Cobra4 Sensor-Unit for the purpose that it is
intended for.
This Cobra4 Sensor-Unit is only to be operated in dry
rooms in which there is no risk of explosion.
Protect the Cobra4 Sensor-Unit from dust, moisture and
vapours. Clean it with a slightly moistened, lint-free cloth.
Aggressive cleaning agents and solvents are unsuitable.
Do not attempt to open the housing of the Cobra4 Sen-
sor-Unit.
Take care that no liquid penetrates through the housing
into the Cobra4 Sensor-Unit, as this would then be dam-
aged.
Only connect the data output of the Cobra4 Sensor-Unit
to measurement recording instruments and measuring
lines that are designed for use with it.
Attention!

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Today’s state of software development makes it impossi-
ble to guarantee that a product is free from faults.
PHYWE Systeme GmbH & Co. KG therefore does not
accept any liability for damages that result from the instal-
lation or use of this instrument.
2 PURPOSE AND CHARACTERISTICS
The Cobra4 Sensor-Unit Electrophysiology serves for wire-
less and cable-connected measurements of heart, eye or
muscle activity by means of ECG (electrocardiography), EMG
(electromyography) and EOG (electro-oculography).
The Cobra4 Sensor-Unit Electrophysiology can be connected
to one of the following measured data recording instruments,
as appropriate for the type of application, and transfer the
data to it:
a Cobra4 Wireless/USB-Link (12601-10) for tethered or
wireless data transfer to a computer or a mobile device, and
a handheld Cobra4 Mobile-Link 2 instrument (12620-10).
The following accessories are required for ECG, EMG and
EOG measurements:
Single measuring lines (yellow, red, green),
Electrodes (reusable or single-use electrodes), and
Alligator clips when single-use electrodes are used.
A list of accessories required for measurements is given in
section 8 (Accessories). Only use accessories that are in-
cluded in this list.
The Cobra4 Sensor-Unit Electrophysiology is neither suitable
nor approved for medical purposes. It is intended exclusively
for use in didactics. It is not to be used to carry out defined
measurements on humans in order to make a diagnosis from
the symptoms and so does not serve for the monitoring,
treatment or alleviation of illnesses. It is therefore not subject
to the more intensive requirements of Medical Guidelines
(MPG).
3 FUNCTIONAL AND OPERATING ELEMENTS
3.1 Operating elements
The Cobra4 Sensor-Unit Electrophysiology has no manual
operating elements. Operation of it is carried out via a hand-
held Cobra4 Mobile-Link 2 or, in the case that it is connected
to a Cobra4 Wireless/USB-Link, via a computer or mobile de-
vice. The connection between the Sensor-Unit and one of the
two measured data recording instruments is active as soon
as it is made.
3.2 Sensor interface
Measured values can be read out from the Sensor-Unit at a
maximum rate of 1 000 measured values per second
(1 000 Hz). Just as all other settings, the wanted measure-
ment frequency can be set via the instrument that has been
connected to record measured values.
4 NOTES ON OPERATION
For safety reasons, the Cobra4 Sensor-Unit Electro-
physiology must only be used if the attached Cobra4 meas-
ured data recording instrument is not connected to the mains
voltage!
Ensure that either
a) the Cobra4 measured data recording instrument is used
in battery mode with the USB cord disconnected, or
b) in case of a USB connection between the Cobra4 meas-
ured data recording instrument and a laptop, the latter is
used in battery operating mode with the power supply
disconnected, or
c) in case of a USB connection between the Cobra4 meas-
ured data recording instrument and a commercially
available PC or laptop with the power supply connected,
the latter are operated via an isolation transformer that is
not earthed.
Otherwise do not use the Cobra4 Sensor-Unit Electrophysi-
ology, also not when the measured data recording instrument
is charged via a USB power supply (e.g. 07932-99)!
We recommend operation with the Cobra4 Wireless/USB-
Link (12601-10) in wireless mode.
Together with the particular transmission instrument (Cobra4
Mobile-Link 2 or Cobra4 Wireless/USB-Link), the Cobra4
Sensor-Unit Electrophysiology fulfils the technical require-
ments compiled in the current European Community Guide-
lines. The product characteristics justify the CE-mark.
Use of this instrument is only permissible under the supervi-
sion of qualified staff in a controlled electromagnetic envi-
ronment of research, teaching and training facilities (schools,
universities, institutes and laboratories).
Such an environment is one in the vicinity of which the use of
radio emitters such as mobile phones is forbidden. Individual
leads that are connected must not be longer than 2 m. The
instrument can be so influenced by electrostatic charges and
similar electromagnetic phenomena (HF, bursts, indirect
lightning discharges, etc.) that it no longer works within the
given specifications.
The following measures reduce or eliminate the effect of such
disturbances:
Avoid fitted carpets; ensure potential equalization; experi-
ment on a conductive, earthed pad; use screening, screened
cables. Do not allow the use of high frequency emitters (radio
equipment, mobile phones) in the immediate vicinity.
5 HANDLING
This section describes how to use the Sensor-Unit and re-
cord data. To avoid failure or improper operation, please read
carefully through this section.
5.1 Putting into operation
Connect the Cobra4 Sensor-Unit Electrophysiology to one of
the Cobra4 measured data recording instruments by means
of the click-catch 15-pin plug connector. Connect the three
colour-coded single measuring lines (article no. 12673-01) to
the Sensor-Unit as shown on the front plate of the Sensor-
Unit (plus, minus, ref.). The Cobra4 Sensor-Unit is now im-
mediately ready to use, as the voltage for it is supplied by the
measured data recording instrument.
Further information on the control of the measured data re-
cording instruments is to be found in their operating instruc-
tions.
For operation of some Cobra4 interfaces,
PHYWE software is eventually required. Please
make sure that the current version is installed on
your device. Therefore read the operating instruc-
tions of the Cobra4 interface you want to use.

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Procedure using the software measure
Select the desired type of measurement, ECG, EOG or EMG
in Cobra4 measure as follows: Double click on “voltage ”
under the “Electrophysiology” entry in the navigation window.
The “Channel voltage ” window now opens. Select here the
“Settings” tabulator (see Fig. 2) and click on the wanted type
of measurement.
The gauge electronics adjusts to the zero line as soon as
connection of the measuring electrodes to the Sensor-Unit
has been made. During this transient oscillation phase, no
values are measured even if you have started measurement.
Further information on the steering of measured value re-
cording is given in the operating instructions of the respective
measurement recording instruments.
Fig. 2: “Channel voltage ” window.
5.2 ECG
Either reusable electrodes or single-use electrodes can be
used for ECG.
When a measurement is being made, it will be influenced by
even slight muscle activity. A relaxed sitting or lying position
is therefore necessary during measurement. When sitting, lay
the hands on the thighs.
When the three ECG reusable electrodes (article no.
65981-01) are to be used, prepare a 1 % potassium chloride
solution. Cut paper towels to areas of 3 cm x 8 cm, wet these
small sheets with the potassium chloride solution and then
position them as wetted paper contacts between the ECG
reusable electrodes and the skin.
Now use the rubber bands to fasten one each of the three
reusable electrodes to the inner sides of the two wrists and
directly above the ankle on the inner side of the left lower leg.
Plug the 2 mm thick ends of the three colour-coded single
measurement lines in the electrode sockets according to the
assignment shown in the display. You can now start meas-
urement.
The single-use electrodes (article no. 12559-01) have the ad-
vantage that they can be stuck directly onto the skin without
the need for any preparatory measures. When they are to be
used, first fit the alligator clips (article no. 12673-02) to the
single measurement lines, stick the single-use electrodes on
the skin at the positions described above, but without the pa-
per contacts etc., and clamp the alligator clips to the loose
ends of the single-use electrodes.
5.3 EMG
Either reusable electrodes or single-use electrodes can be
used for EMG.
When three EMG reusable electrodes (article no. 65981-02)
are to be used, use electrode cream (article no. 65981-05) to
improve the contact between skin and electrodes.
Use adhesive plaster to fasten the three reusable electrodes
to the muscles to be measured. Elbow or calf muscles are
suitable for this. Position the reusable electrodes at a suffi-
cient distance from each other one below the other. Now plug
the 2 mm thick ends of the three colour-coded single meas-
urement lines in die sockets of the EMG reusable electrodes
from above to below in the following succession: yellow, red,
green. You can now start measurement.
The single-use electrodes (article no. 12559-01) have the ad-
vantage that they can be stuck directly onto the skin without
the need for any preparatory measures. When they are to be
used, first fit the alligator clips (article no. 12673-02) to the
single measurement lines, stick the single-use electrodes on
the skin at the positions described above, but without the pa-
per contacts etc., and clamp the alligator clips to the loose
ends of the single-use electrodes.
5.4 EOG
The three EMG reusable electrodes (article no. 65981-02)
are also used for elektro-oculography. Use electrode cream
(article no. 65981-05) to improve the contact between skin
and electrodes as in EMG measurements.
Use adhesive plaster to fasten the reusable electrodes to the
following positions in the eye area; to an ear lobe (green sin-
gle measurement line), alongside the left eye (yellow line)
and alongside the right eye (red line). Now plug the 2 mm
thick ends of the three colour-coded single measurement
lines into the sockets of the EMG reusable electrodes. You
can now start measurement.
Single-use electrodes (article no. 12559-01) could also be
used but reusable electrodes are better suited to this applica-
tion, because their smaller area allows them to be more ex-
actly positioned. If single-use electrodes are to be used, fit
the alligator clips (article no. 12673-02) to the single meas-
urement lines, stick the single-use electrodes on the skin at
the positions described above and clamp the alligator clips to
the loose ends of the single-use electrodes.

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6 TECHNICAL DATA
(typical for 25 °C)
Operating temperature range 5–40 °C
Relative humidity < 80 %
With plug sockets for 3.5 mm jack plugs for single measure-
ment lines with assignment identification.
Operation using three separate and screened measurement
lines.
Galvanic separation with 4 000 V (protection class 2)
Measurement mode: Long-term measurement with 1 000 Hz
sampling rate
Signal filter:
ECG-Filter 0.03 Hz…20 Hz
EMG-Filter 80 Hz…5 000 Hz
EOG-Filter 0.03 Hz…10 Hz
Data throughput rate: 1 000 Hz
Dimensions:
Housing dimensions (mm) approx. 62 x 110 x 35
Weight approx. 190 g
7 SCOPE OF SUPPLY
The extent of delivery comprises:
Cobra4 Sensor-Unit Electrophysiology 12673-00
Operating instructions
8 ACCESSORIES
Refer to sections 5.1 to 5.4 for the use of the individual
accessories.
Single measurement lines, colour-coded (3/pack) 12673-01
ECG-Reusable electrodes, 8 cm x 3 cm (3/pack) 65981-01
EMG-Reusable electrodes (3/pack) 65981-02
Electrode cream (tube, 100 g) 65981-05
Single-use electrodes (100/pack) 12559-01
Alligator clips for single-use electrodes (3/pack) 12673-02
9 WARRANTY
We guarantee the instrument supplied by us for a period of
24 months within the EU, or for 12 months outside of the EU.
Excepted from the guarantee are damages that result from
disregarding the Operating Instructions, from improper han-
dling of the instrument or from natural wear.
The manufacturer can only be held responsible for the func-
tion and technical safety characteristics of the instrument,
when maintenance, repairs and alterations to the instrument
are only carried out by the manufacturer or by personnel who
have been explicitly authorized by him to do so.
10 WASTE DISPOSAL
The packaging consists predominately of environmentally
compatible materials that can be passed on for disposal by
the local recycling service.
PHYWE Systeme GmbH & Co. KG
Customer Service
Robert-Bosch-Breite 10
37079 Göttingen
Germany
Phone [phone]
Fax [phone]
11 SYMBOL DESCRIPTION
Caution!
Potentially harmful situation
(damage of property)
Generally dangerous spot
Follow operating instructions
Note
Important device information
Follow operating instructions
Equipment type BF
Patient leakage currents, isolation,
creepage distance and clearance have
been tested based on DIN EN 60601-1
for medical electrical equipment.
However this instrument must not be
used in defined human measurements for
diagnosis of a state of disease.
Unplug when in use!
For safety reasons, the Sensor must only
be used if the attached Cobra4 measured
data recording instrument is not con-
nected to the mains voltage!
Should you no longer require this product,
do not dispose of it with the household re-
fuse.
Please return it to the address below for
proper waste disposal.