BIOPAC® Systems, Inc. Logo

External Devices and Channel Contention

Channel contention must be considered when connecting the analog output sourcing from external devices to an MP1X0 Data Acquisition System. Considerations for MP160 or MP150 users follow; MP100 users should refer to Channel Contention Issues for MP100 near the end of this page.

MP160 or MP150 Users

MP160 System Amplifier Interface Module

To connect external device outputs to the MP160 or MP150:

Note: If all amps making electrical connection are BioNomadix amplifiers, isolating external devices is not required.

Channel contention issues

  1. If an analog channel is used on the AMI100D or HLT100C, make certain that two external devices do not use the same analog channel.
  2. If amplifier modules are connected to the MP System, then those amplifier modules must be set to a channel that is not used by external devices plugged into the AMI100D or HLT100C.
  3. Wired amplifiers such as the ECG100C are set to the channel by the red channel switch on the top of the unit.
  4. Wireless BioNomadix units, such as the BN-RSPEC, use two channels (except for the BN-ACCL3, which uses three). These are indicated by the switches on the front of the units.
  5. Smart Amplifiers such as the ECG100D or EMG100D must be plugged into the AMI100D. They are not compatible with the HLT100C.
  6. Smart Amplifiers require their own individual channel as would any external device.

Example:

Two external device outputs and an EMG100C amplifier are connected to the MP160 system and connected to a human subject.

– Device one is a force plate
– Device two is a strain gauge
– The EMG100C measures the subject’s muscle activity

In this case, to fully isolate the human subject:


Channel Contention Issues for MP100

  1. If an analog channel is used on the UIM100C or HLT100C, make certain that two external devices do not use the same analog channel.
  2. If amplifier modules are connected to the MP System, then those amplifier modules must be set to a channel which is not used by external devices plugged into the UIM100C or HLT100C.

For example

Two external device outputs and an ECG100C amplifier are connected to the MP100 system and connected to a human subject.

In this case, to fully isolate the human subject:

*pre-2016 model or HLT100C-MP150

Associated Applications

Spotlight On
free BIOPAC webinar

Ergonomics & Fatigue Series Part II: Cognition & Neuroergonomics

Learn about the tools you can use in neuroergonomics research such as fNIRS, EEG with cognitive state detection, and eye tracking.

You Will Learn:
– Data analysis for fNIRS, EEG, HRV, and eye tracking (including pupillometry, saccades)
– How to perform experiments in VR
– Automation and standardization
– Tips and tricks for getting optimal data quality
– Demonstration
Join Live
December 1st
8am PT / 11am ET

Register Now
Latest News

New Citations | BIOPAC in Ergonomics

Whether using specialized equipment, performing repetitive tasks, or simply going about our daily work routine, the effects of design in our environment as well as the tools we use and the way we use them can impact our health, work performance, and quality of life. Here are a few studies that have recorded and analyzed […]

EDA Guide Available

BIOPAC’s comprehensive EDA Guide provides an introduction to Electrodermal Activity (EDA or GSR) and details topics including: EDA Complex: SCL, SCR, tonic, phasic, specific SCR, non-specific SCR Participant Prep & Electrode Placement Data Recording tips Automated EDA Analysis Routines Digital input to Stim Events Stim-Response Analysis Derive Phasic EDA from Tonic Event-related EDA Analysis Locate […]

Read All
Request a Demonstration
Request a Demonstration