Precor EFX546i - Manual (Page 59)

3. Wearing a Chest Strap
During a workout, the heart rate features appear on the display
when you wear a chest strap. To receive an accurate reading, the
chest strap needs to be in direct contact with your skin.
1. Carefully dampen the back of the strap with tap water Refer to
the following figure.
Note: Do not use deionized water. It does not have the proper
minerals and salts to conduct electrical impulses.
Figure 4: Moisten chest strap
2. Adjust the strap and fasten it around your chest. The strap
should feel snug, not restrictive. Refer to the following figure.
Figure 5: Adjust chest strap
Make sure that the chest strap is right side up, lies horizontally
across your chest, and is centered in the middle of your chest.
Refer to the following figure.
Figure 6: Fasten chest strap
After you put on the chest strap, face the display console for a few
seconds. This allows the receiver in the console to recognize the
signal from the chest strap.
User's Reference Manual: Heart Rate Features 9