Tech Note 65 Detail

Erratic CI-6543 heart rate readings

Affected Products:



PASCO Solution:


  1. Increase the sampling rate.
    1. Click on the Sampling Options button in the setup window then use the right arrow to increase the number of samples per second.
    2. Click on the OK button.
  2. Change the position of the clip. Move the clip up higher on your earlobe or put it on your finger tip instead.
  3. Sit down and remain still while collecting data.
  4. If you are in a brightly lit room, block some of the room light from the clip.
  5. Use the cursor to highlight a region in the graph that does not include the first few data points (it takes a few seconds for the sensor signal to adjust to new conditions). Then use the statistics menu to get a mean value of the highlighted points.

Please note that the CI-6543 is obsolete and not repairable. We now offer the following heart rate sensors, which require PASPort interfaces:

Creation Date: 01/1/2000
Last Modified: 11/18/2014
Mod Summary: