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
Buy MP41 with BSL

Practical Lab Kit with BSL 4 & MP41

BSL Home enables students to safely conduct hands-on physiology labs wherever they are! Purchase this complete lab solution to preserve practical lab experience! Includes MP41 Unit+Lead Set with BSL Home software, EL503 electrodes, WRAP1 self-adhering wrap for EEG lessons, and disposable 9 V battery. For instructors—BSL Home makes it easy for instructors to continue running practical […]

View All
Latest News

New Citations | Logic Games and Meditation: the Key to Unlocking our Brains?

Studying Cognitive Activity with fNIR! The age-old game of chess is known as a thinking man’s game, where foresight, critical thinking, and strategy are required to become a good chess player, and the terms “genius” or “brilliance” are bestowed upon the chess masters of the world. As such, chess is an excellent cognitive tool to […]

Electrocardiography Guide Now Available

BIOPAC’s comprehensive Introductory ECG Guide addresses fundamental to advanced concerns to optimize electrocardiography data recording and analysis. Topics include: ECG Complex; Electrical and Mechanical Sequence of a Heartbeat; Systole and Diastole; Configurations for Lead I, Lead II, Lead III, 6-lead ECG, 12-lead ECG, precordial leads; Ventricular Late Potentials (VLPs); ECG Measurement Tools; Automated Analysis Routines for extracting, […]

Read All
Request a Demonstration
Request a Demonstration