LSD
To change the range
The Heart rate sensor can record either Heart rate in beats per minute (bpm) or Heart
waveform (mV). To change the range on Vu:
Use the
buttons to scroll to Meter and press
.
Press
. Scroll so the cursor is pointing to
Heart Monitor
and press
.
With the cursor pointing at
Set range
press
The cursor will indicate the range currently selected. Use the
buttons to scroll the list until the cursor is pointing at the
required range. Press
to select.
Press
to return to the sensor window, then
to return to Meters window.
The range setting is retained by Vu and will be applied to any Heart rate sensor that is
connected to the logger until changed by the user.
It is also possible to change the range from within the EasySense software. For instructions
please refer to the software user
’s manual.
Requirements
For Vu to recognise this sensor your logger must have
V1.1
or higher firmware.
To find Vu
’s firmware version carry out a hard reset (press + + at the same time for a second
and then release). The LCD will display EasySense Vu and its firmware version number before returning
to the main menu.
For full features (e.g. pictogram using heart picture) use with
V3.2
or higher of the EasySense
software.
Upgrades are available from Downloads on the Data Harvest website (
).
Practical information
The amount of light that can be detected by the Light Sensitive Detector (LSD) will vary with
each test subject and as to whether the clip is attached to a fingertip or ear lobe.
When attached to a finger:
Position the finger lobe clip so that the LSD is on the
fleshy side of the finger.
Nail varnish may block infrared and so affect readings.
Values should not be affected by skin colouring.
Some subjects may have poor peripheral circulation (the
extent to which the blood vessels in the fingertip are
filled with blood), in which case use the earlobe or select
another subject.
If the heart rate does not seem to settle, try warming the hands by rubbing to increase the
blood flow.
If readings are lower than expected, try repositioning the clip to make sure contact is
obtained.
Attached to an ear lobe:
Remove any earrings before attaching the finger/ear lobe clip to the ear lobe.
The clip can be made more secure by attaching th
e slide on the lead to the subject’s
clothing.
If the heart rate does not settle or if readings are lower than expected, try repositioning
the clip.
Each time the finger/ear lobe clip is attached to a fingertip or ear lobe, wait until the signal
stabilises before starting to record data - the initial unstable signal will be due to compression
from the clip being attached.
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►
Waveform
Beats / min
