If your graph has flatlined or reads 150, it means the software is receiving a poor signal. Try these quick fixes:
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Direct Connection: Plug your sensor directly into your computer’s USB port, avoiding unpowered hubs or keyboard ports.
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Unplug Peripherals: Systematically disconnect other USB devices to see if they are causing a conflict.
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Reduce Interference: Move Bluetooth or other wireless devices away from your emWave hardware.
If the issue continues, please contact HeartMath Tech Support for further assistance.
Detailed Knowledge Base Article
Overview
A “flatline” on the HRV graph or a constant heart rate reading of 150 BPM is a specific error state in emWave PRO. It signifies that the emWave module is struggling to send a clean data signal to the software. This is rarely a medical concern or a broken sensor; it is almost always a result of your computer’s USB environment or environmental interference.
Potential Causes and Solutions
1. USB Device Conflict Other peripheral devices (printers, external drives, webcams) connected to your USB ports can sometimes “starve” the emWave module of data bandwidth or create electrical noise.
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Action: Systematically disconnect other USB devices. Test the emWave program with only the sensor module plugged in to see if the signal returns to normal.
2. Insufficient Power (USB Hubs) The emWave sensor module requires a steady power supply to function correctly. Plugging the sensor into a non-powered USB hub or a USB port on a keyboard often provides insufficient voltage.
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Action: Plug the emWave USB module directly into one of the main USB ports on your computer. If you must use a hub, ensure it is a powered hub (one that plugs into a wall outlet).
3. Wireless and Bluetooth Interference Because the emWave module handles sensitive pulse data, it can be susceptible to electromagnetic interference from devices in close proximity.
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Action: Move wireless routers, Bluetooth speakers, or mobile phones away from the emWave module and sensor cord.
4. Driver and Port Refresh Sometimes the computer’s USB controller simply needs a refresh.
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Action: Close the emWave software, unplug the module, wait 10 seconds, and plug it into a different USB port on the computer before restarting the software.
Still Experiencing Issues?
If you have tried the steps above and your graph still reads 150 or remains flat, there may be a deeper system conflict or a potential hardware issue. Please reach out to HeartMath Technical Support for advanced troubleshooting.