BIOPAC® Systems, Inc. Logo

PPG setup and calibration

To record a pulse waveform using the PPG100C, follow these setup and calibration details:

Connections

Plug the transducer into the amplifier but do not connect it to the subject yet.

red lead into VSUP+ port
black lead into GND port
blue lead into INPUT port

PPG100C swithc settings to record puilseSwitch Settings

Hint: Using the 3.0 Hz LP setting and the 0.5 Hz HP setting in conjunction will make it easier to find the rate of the pulse waveform (these filters can be applied in software as well).

Gain: 10 (lowest Gain option) = top position
LP: 3.0 Hz = top position
HP (first bank) : 0.5 Hz HP = top position
HP (second bank): 0.05 Hz HP = top position

Set Up Acquisition

Recommended acquisition sample rate: 100 Hz.

Recording

  1. Start recording in AcqKnowledge.
    • No calibration is necessary—simply make sure the correct channel is enabled and no other amplifiers are set to the same channel.
  2. Perform Amplifier baseline offset adjustment.
  3. After the amplifier baseline offset adjustment is complete, place the transducer on the finger (e.g., index finger tip) and tighten the Velcro strap (or attach to the ear with adhesive collars).
    • Note: To minimize motion artifact, place the sensor on a hand that will remain mostly immobile.
  4. Check the tension level.
    • If the strap is too tight, blood flow may be constricted, resulting in an almost straight line signal.
    • If the strap is too loose, ambient light could enter the sensor, resulting in no recognizable waveform.
  5. Once you are able to obtain a good recording, it is recommended to increase the gain as much as possible as long as the pulse waveform never goes beyond ±10 Volts.
    • The 0.5 Hz HP filter setting will force the signal to return to baseline faster than with the 0.05 Hz filter.
    • The 10 Hz LP filter will reveal more detail from the waveform than the 3 Hz LP filter.
    • Observe the effect of different filter settings (note that any additional filtering can also be performed in the software, either online or offline).

Sample Results

The following graphs show results of motion artifact and varying tension levels:

Well-placed sensor:

Example of motion artifact (finger):

Example of movement artifact (hand):
Loose sensor:
Tight Sensor:

Associated Applications

Associated Application Notes

Spotlight On
BioShirt wireless ECG and respiration

BioNomadix BioShirt

Smart shirt simultaneously acquires ECG and Respiration data while subjects roam freely The lightweight, comfortable BioNomadix BioShirt contains a respiration sensor and fabric electrodes to wirelessly record both respiration and ECG while ambulatory subjects move freely and perform tasks in short or long-term studies, in the lab, or in the real world. The shirt connects to a wireless BioNomadix BN-RSPEC Respiration […]

View All
Latest News

T4 Conference Poster Presentations

Research posters presented at BIOPAC’s T4 physiology conference (Tools, Trends,  Techniques, and Technology) exhibited leading physiological research utilizing BIOPAC’s technology. Research posters presented unique advances in neuromarketing and health research. The T4 conference, held at UCSB Monday, July 24, 2017 through Wednesday, July 26, 2017, showcased the latest trends in the Tech industry’s physiological research. […]

BIOPAC on Good Morning America | Anxiety and Excessive Cell Phone Use

ABC News | Good Morning America | Excessive Cell Phone Use JULY 31, 2017 | Excessive cell phone use may cause anxiety, experts warn BIOPAC user Nancy A. Cheever, Ph.D. from California State University, Dominguez Hills was featured on Good Morning America. Her study investigated whether spending too much time on your phone may be causing people to feel […]

Read All
Request a Demonstration
Request a Demonstration