When testing the PPG function of wearable devices, the major difficulty is how to test the PPG function when the arrangement of LEDs and PDs on DUT differs from it of the testing equipment.
A fixture helps overcome this difficulty by assisting the DUT in aligning to the PPG module for accurate test results.
The LEDs and PDs on the DUT should be aligned to the PDs and LEDs on the PPG module to achieve the best test results.
Please refer to the table below for categorizing your DUT and suggested plans.
the LEDs and PDs on DUT
|Non-side-by-side (specific patterns)|
• Can directly align to the WhaleTeq PPG module (standard)
|DUT Descriptions|| |
• Can't directly align to the WhaleTeq PPG module
|Solutions to designing|
1. The pictures shown are for illustration purposes only.
2. After the customer applies to customized fixtures, WhaleTeq will evaluate the design of DUT to confirm whether it can be undertaken.
*Note: Whether to provide the components depends on actual needs.
*Note: It's recommended to use the same LED and PD components as the DUT to have the identical wavelength of the optical signals for more accurate testing.
1. If the PCBA and fixture need to be calibrated regularly, please inform WhaleTeq in advance so that the design team can reserve positioning points.
2. Whether to provide the components depends on actual needs.