2
4. Technical data
Pressure range:
0 mm Hg to 300 mm Hg
(0 to 400 hPa)
Overload-proof:
up to 1500 hPa
Sensor type:
Precision pressure sensor,
calibrated and
temperature compensated
5. Operation
Note: During the measurement, the arm of the test
person should be relaxed and lying on the table,
bent slightly at the elbow. The arm must not be
moved during the measurement!
•
Connect the blood pressure sensor only to the
analogue input U
in
A
of the 3B NET
log
TM
using the
miniDIN connecting cable.
•
Switch on the 3B NET
log
TM
and wait for it to
recognise the sensor ("Probe Detect").
•
Place the sensor box near the test person.
•
Lay the blood pressure cuff on the unclothed
upper arm of the test person, and slide it
towards the shoulder until the lower edge of
the cuff is about 2 to 3 cm above the elbow,
which is approximately the level of the heart.
•
Close the blood pressure cuff with the Velcro
fastener, and slide and turn it so that the tubes
lie on the inside of the upper arm in the region
of the artery.
•
Check that the blood pressure cuff is firmly in
place, and if necessary correct it by adjusting
the Velcro fastener: however, the cuff must not
be so tight that it presses on the artery before
pumping begins!
•
Using the pump ball, increase the pressure in
the blood pressure cuff to a level higher than
the expected arterial pressure, e.g., to about
180 mm Hg. Note the pressure value shown in
the display of the 3B NET
log
TM
. Ignore the
acoustic signal produced by the signal
generator at this point.
•
By pressing lightly on the air release valve of
the pump ball, slowly release air from the
blood pressure cuff, and listen for the onset of
the acoustic signal at the pulse frequency
(
Korotkoff
sound): this indicates the upper
(systolic) blood pressure value.
•
Note the systolic pressure value shown on the
display of the 3B NET
log
TM
.
•
Optional: Determine the pulse rate by counting
the number of acoustic signals in a
predetermined time interval.
•
When the acoustic signal ceases it indicates
that the lower (diastolic) blood pressure value
has been reached: note the value shown on the
display.
Important: When the blood pressure measurement
has been completed, deflate the cuff completely by
pressing firmly on the air release valve.
Allow a rest period of about 2 minutes between
repeated measurements on the same test person.
6. Applications
Measuring the blood pressure when the body is
resting and during various physical activities.
Measuring effects of external factors on the blood
pressure (e.g., stressful or unusual situations,
“white coat hypertension” during a visit to the
doctor).
7. Sample experiments
Measurement of the blood pressure of a test
person by the auscultatoric method
Apparatus required:
1 3B NET
log
TM
U11300
1 3B NET
lab
TM
U11310
1 Blood pressure sensor including accessories
U11395
•
Prepare the experiment as shown in Fig. 1.
•
On the 3B NET
lab
TM
, open the application
programme (template) for the experiment with
the blood pressure sensor.
•
Start the template and plot the measurement
curve for the blood pressure and for the pulse
signal (Fig. 2).
•
Investigate the dependence of the blood
pressure and the pulse rate on the physical
condition of the test person.
•
Change the test conditions for the person being
tested and repeat the experiment.
•
Evaluate the results of the experiment.
