Wireless Instructions.indd

Wireless Instructions.indd
Wireless Heart Receiver Sensor
for the LogIT Microsense® system
The LogIT Heart receiver enables a person’s heart rate sent from a ‘POLAR’, ‘Wristcoach’ or similar
wire-less pulse transmitter system to be monitored and recorded either ‘live’, or stored in LogIT
for later recall and display. Do not drop it or get it wet and never try to dismantle it. The system
is easy to use but needs to be set up correctly for reliable operation, so please read these instructions fully before use. The equipment required:
LogIT Heart rate receiver
POLAR transmitter & watch system (or similar) plus suitable skin gel
LogIT (e.g. DataMeter, Voyager) with charged battery (Not compatible with LIVE)
A Computer for monitoring LogIT results
Before using your POLAR system (or equivalent) with LogIT we recommend you test and get used
to using the transmitter and watch set on their own to appreciate the basic principles and limitations of the system - we strongly recommend you apply a conductive gel to each pad (see next
page) before fitting the transmitter.
You are assumed to already have experience in using LogIT - if you do not please refer to the
instruction manual supplied with LogIT.
Setting up the system
The LogIT + Heart Receiver set works best when used independently from the computer but it can
be connected for a live display of results.
The unit is a small high frequency receiver tuned to the POLAR transmitter but may also pick up
interference from monitors, computers etc. so if you have a LogIT with a display (e.g. Voyager
or DataVision) use these to set up the system away from the computer. Correct positioning is essential to ensure reliable operation as the transmitter gives out only a very small signal which is
directional, so please use the diagram on the next page to position equipment correctly.
Logging results remotely
When you are ready to log simply turn on the logger and press the green button to start AutoLogging. You can mark events in the usual way and when you have finished exercising turn on the
logger and press the red button. You can then load the results in the usual way. Keep away from
sources of interference such as TVs, monitors, motors etc.
Real Time Logging
Connect the LogIT link cable from the computer to the LogIT, keeping LogIT as far away from
computer/monitors as possible. If you have general purpose logging software (e.g. LogIT Lab,
Insight etc.) we suggest you select the real time display to set up the system.
VERY IMPORTANT: Keep Heart receiver/LogIT as far away as possible
(minimum 1.5 metres) from computer & monitor as the receiver is very sensitive to interference.
Instructions &
The resources shown overleaf are also
available in PDF form at www.logitworld.com
DCP Microdevelopments Ltd
Bryon Court
Bow Street
Great Ellingham
NR17 1JB
Tel: 01953 457800
Fax: 01953 457888
email: support@dcpmicro.com
Wireless Heart Receiver Sensor
for the LogIT Microsense® system
Preparing body and equipment!
The most important part of setting up your Heart monitoring system for reliable operation is good positioning of the transmitter and receiver.
The Heart transmitter is clipped onto the belt which is fitted
across the chest making a good tight contact with the skin.
A suitable electrolyte gel must be used under each of the
strap’s two conductive pads for reliable contact (see below)
Take care not to ‘short out’ the two pads or this will prevent
proper operation. Make sure the logo is central and in an upright
LogIT with heart receiver plugged in.
The yellow cap of the receiver is the most sensitive area.
It must not be knocked during use or errors will result.
You can experiment with the position of the transmitter and LogIT
but make sure that the heart receiver is not accidentally knocked with
your hand or leg as unwanted extra pulses will be added to the results
(Because the system has to calculate beats-per-minute every second
just one knock can effectively double the pulse rate calculated increasing readings dramatically).
IMPORTANT: Always keep as far away from computers and screens as the cable will allow (Minimum 1.5
metres) or they can interfere with the signal.
Problems? - please check the following:
• No pulse output being shown in ‘real-time’ display:
Check transmitter working using the watch - if not replace transmitter battery.
If OK move LogIT receiver nearer to transmitter. Check LogIT battery.
• Sudden increases of heart rate (spikes) shown:
Receiver has picked up interference from nearby equipment or been knocked causing extra pulse(s).
Adjust position of LogIT/Receiver.
• Occasional loss of results:
Transmitter strap too loose or requires better skin conduction (see below). Transmitting distance too far
- replace transmitter battery or move receiver nearer.
Important information
The watch may also be worn to check transmitter and monitor pulses live but it will not necessarily indicate correct reception by the Heart receiver.
If required the Heart Receiver can be used a short distance away from LogIT using a single Microsense
extension cable. This allows it to be more easily placed on the body (eg in a top track suit pocket) next
to the Polar etc. Heart Transmitter. Note that if the subject being monitored is not doing strenuous exercise there may be insufficient body sweat to allow good conduction between the skin & the two transmitter conductive belt pads. Special conductive gel’s available from some chemists will improve conductivity
(eg ‘Dracard’ electrode gel, K-Y gel) or you can make up a saline solution. Smear a small amount of gel
Other sensors may be plugged into LogIT at the same time as the heart receiver (for example a temperature probe to monitor skin temperature) and general purpose software will display their results as
well as the pulse rate.
Note:This product must not be used in life support applications
How the system works
The POLAR (or equivalent) system works by detecting and amplifying the small electrical heart signals
through the skin using two conductive rubber pads and then transmitting a pulse to a receiver using a
short range low frequency signal. The LogIT Heart Receiver is a miniature version of the watch which receives the signal and converts it into a form which LogIT can use to show and log results. As the instructions supplied with your POLAR system points out, it works on a frequency which makes the watch (and
the LogIT Heart Receiver) also sensitive to physical knocks and electrical interference from other equipment, especially television monitors. The LogIT Heart receiver contains circuitry which helps to reduce
the effect of nearby equipment and also restricts the reception direction range, but you should always
keep as far as possible from electrical equipment (Minimum 1.5 metres) & avoid knocking the receiver.
Subject: Biology
Exercise and Pulse Rate
This simple experiment is to measure what happens to the pulse rate during exercise. The circulatory or vascular system is a network of tubes filled with blood. Blood is kept flowing in one direction by the pumping of
the heart. The heart is a muscular organ and with blood vessels forms part of the cardiovascular system. The
cardiac cycle is a series of events which make up a complete pumping action of the heart and can be heard as a
heart beat.
Equipment required: LogIT Datalogger
Wireless Heart receiver
Wireless Heart transmitter
Form of exercise ie. skipping rope,
exercise bike, step ups etc.
Suggested Setup:
1. Connect the pulse transmitter as described in the instructions overleaf.
2. Connect the pulse receiver to the LogIT datalogger.
3. Connect the datalogger to a computer if required.
4. Check that the pulse is being received by the logger or software.
Suggested Method:
1. Start either the datalogger of datalogging software.
2. Begin exercising after a time and observe the pulse rate.
3. After a few minutes stop exercising but continue recording the pulse rate.
4. Stop logging once the pulse rate has returned to the initial pulse rate prior to exercise.
Note: It can be interesting for the student being monitored to see the graph trace as the exercise is
being performed and to see the drop off at the end of exercise.
What do the results show?
Are the results a surprise?
Going further:
What factor could you vary in the experiment? For example, if using an exercise bike, what effect on the
pulse rate might increasing the resistance of the bike have (ie. simulate cycling up hill).
What effect might continually varying the difficulty of the exercise have on the shape of the graph?
What other piece of data might you like to record in addition to the pulse rate?
Schools can freely photocopy these activity sheets for use within their establishment provided copyright is acknowledged to DCP Microdevelopments Ltd.
©DCP Microdevelopments Ltd., 2006
Students should be supervised at all times.
Ensure the datalogger cannot come into contact with water
or be exposed to damp.
Make sure that the activity is suitable for the pupils involved
and is performed in a suitable location.
Always check your local regulations or a school advisory service such as CLEAPSS or SSERC for guidance
on the use of any hazardous material or source.
DCP Microdevelopments Ltd
Bryon Court
Bow Street
Great Ellingham
NR17 1JB
Tel: 01953 457800
Fax: 01953 457888
email: support@dcpmicro.com
Product number: D200057 Document number: D773057/1
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