TFA HiTrax Tip Handbuch Seite 30

13.0 Potential Causes for: NO Heart Rate
Reading or Long Response Time
1) Cause: Dry Skin.
Solution: Apply conductive gel or saliva thoroughly to fingers and wrist
area.(Even water will help if conductive gel is not available).
2) Cause: Fingers are not placed firmly over the sensors.
Solution: Make sure fingers (not the tips) lay flat and firmly over the
sensorsand watch is placed securely on wrist. Do not use the very
tips of your fingers (i.e. visualize tip toeing with your fingertips.)
Fingertips do not allow for enough contact, therefore, ECG will not be
picked up.
3) Cause: Muscle tremors, caused by: A) Pressing down too hard
on the sensors with fingertips. B) Person is in motion and
holding the watch in an awkward manner.
Solution: It is best to place your index finger on the 6:00 sensor, and
middle finger on the 12:00 sensor. This will ensure good and consistent
readings even while walking or jogging with arms swung naturally.
4) Cause: Dead skin on wrist.
Solution: Usually rubbing your skin with a towel will help.
5) Cause: A thin layer of body grease can insulate the ECG signal-
basically prevents the back sensor on the watch from picking
up one's ECG.
Solution: Wipe wrist and the back of watch with a tissue or soft towel.
6) Cause: Hairy arms.
Solution: Apply conductive gel to wrist area.
7) Cause: Irregular heartbeats.
Solution: N/A It is difficult to consistently pick up a reading for those
with irregular heart beats. Inconsistent response times are expected
for those with arrhythmia.