Vernier Software and Technology
Vernier Software & Technology

Qubit EKG/EMG Sensor User Manual

Qubit EKG/EMG Sensor

The Q-S207 Qubit EKG/EMG Sensor is designed to measure voltage waveforms produced during muscle contraction (EMGs). In addition, it has a switch setting that can be used for recording EKGs.

Note: This product is designed for educational use and research in an academic setting only. This product is not designed nor recommended for medical use in a clinical setting. It should not be used for clinical monitoring, life support, patient diagnosis, or clinical testing of any kind.

What's Included

  • Qubit EKG/EMG Sensor
  • Power supply
  • One package of 100 disposable electrodes

Note: The full user manual can be found on the included thumb drive and at

Compatible Software and Interfaces

The Qubit EKG/EMG Sensor may require a compatible interface and software. Choose a platform below to see compatible interface and software options.

Using the Product

This sensor will not be automatically identified by Logger Pro or LabQuest 2 App. Use the following instructions for best results.

Electrode Placement for EKGs

  1. Attach three electrode tabs to the subject as shown in Figure 1. Place a single patch on the inside of the right wrist, on the inside of the right upper forearm (distal to the elbow), and on the inside of the left upper forearm (distal to elbow).
  2. Connect the sensor clips to the electrode tabs as shown in Figure 1. Have the subject sit in a relaxed position in a chair with their forearms resting on their legs or on the arms of the chair.

Figure 1  

Electrode Placement for EMGs

  1. To conduct EMGs, the red and green leads need to be placed on electrodes that are attached to the muscle of interest. The two leads are interchangeable for EMGs. Place these leads along the length of the muscle. The black lead serves as a ground. It should not be placed on the muscle of interest. For example, to record from the muscles of the ventral forearm, attach three electrode tabs to the subject as shown in Figure 2. Two electrode tabs should be placed on the ventral forearm, 5 and 10 cm from the medial epicondyle with the ground electrode on the upper arm. Alternatively, the ground electrode can be placed on the wrist of the adjacent arm to minimize movement artifacts.
  2. Attach the green and red leads to the electrode tabs on the muscle of interest. Attach the black lead to the ground electrode.

Figure 2  

Collecting Data with a Computer

  1. Connect the power supply to the sensor.
  2. Connect the sensor to the Vernier data-collection interface.
  3. Select the appropriate switch setting for the experiment (EKG or EMG).
  4. Place the electrodes on the subject (EKG) or muscle of interest (EMG) as described above.
  5. Attach the sensor leads to the electrodes as described above.
  6. Set up the data-collection program.
    1. Connect the interface to the computer and start Logger Pro.
    2. Open the file, "Q‑S207 EKG Setup" (if doing an EKG) or "Q-S207 EMG Setup" (if doing an EMG) from the Qubit folder within the Probes & Sensors folder. Note: If you cannot locate these files in Logger Pro, they can be downloaded at

You are now ready to begin data collection.

Collecting Data with LabQuest 2 App

  1. Connect the power supply to the sensor.
  2. Select the appropriate switch setting for your experiment (EKG or EMG).
  3. Connect the sensor to LabQuest 2.
  4. Choose New from the File menu.
  5. Place the electrodes on the subject (EKG) or muscle of interest (EMG) and attach the sensor leads as described above.
  6. Set up LabQuest 2 for data collection.
    1. On the Meter screen, tap Sensors and then select Sensor Setup.
    2. Tap the appropriate channel, scroll down the list of sensors, and tap Qubit.
    3. Select q-S207 EKG/EMG and tap OK.
    4. Tap OK again to return to the Meter screen.

You are now ready to begin data collection.

Repair Information

If you are having trouble with your Qubit EKG/EMG Sensor, contact Vernier Technical Support at or call 888-837-6437. Support specialists will work with you to determine if the unit needs to be sent in for repair. At that time, a Return Merchandise Authorization (RMA) number will be issued and instructions will be communicated on how to return the unit for repair.


Item Order Code

EKG Electrodes



Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer. This warranty does not cover damage to the product caused by abuse or improper use. This warranty covers educational institutions only. Consumable items, such as electrodes, are excluded from the warranty.

Contact Support

Fill out our online support form or call us toll-free at 1-888-837-6437.

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