NB 902 User Manual page 16

5.8
Workout Mode - Potential Causes for NO Heart Rate Reading
or Long Response Time
1) Cause: Dry Skin.
Solution: Apply conductive gel or saliva thoroughly to chest area. Even water will help if
conductive gel is not available.
2) Cause: Chest strap is not placed firmly over the chest.
Solution: Make sure the chest strap is placed firmly over the chest by tightening elastic
band.
3) Cause: Muscle tremors caused by holding the Chest strap too hard on your chest.
Solution: The contacts must make firm contact (NOT too hard) with the user's skin
during measurement. This will ensure good and consistent readings even while walking
or jogging with arms swing naturally.
4) Cause: Dead skin on chest.
Solution: Usually rubbing your skin with a towel will help.
5) Cause: A thin layer of body grease insulate the ECG signal which prevents the Chest
Strap or Watch from picking up one's ECG.
Solution: Wipe chest and the back of Chest Strap with a tissue or soft towel.
6) Cause: Hairy skin.
Solution: Apply conductive gel to chest area or wrist.
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.
8) Cause: Battery Low.
Solution: It might be due to the battery level of the Chest Strap / watch is low. Replace
the battery and try again.
9) Cause: Interference of other RF devices (Chest-Strap Measurement)
Solution: Depart from the place where RF source potentially exist.