Bipolar-to-auxiliary (Bip2Aux) adapter for V-Amp and ActiCHamp amplifiers 

The BIP2AUX Adapter is a tiny, analogue differential DC amplifier that amplifies the incoming signal in order to make it measurable and relays it through the auxiliary input ports of the V-Amp and the actiCHamp. The adapter consequently turns these two amplifiers into even more versatile research tools by making them able to also record bioelectrical signals with a bipolar montage (a common way of acquiring EOG, ECG or EMG signals).

Although actiCHamp and V-Amp have inputs for auxiliary sensors, these inputs are intended to accept signals that typically lie in the volt range, whereas the amplitude of bipolar bioelectrical signals typically has values of just a few mV. The mismatch between the magnitude of the data and the operating range of the input channels prevented signals of sufficiently good quality from being acquired so far.

 

 

The BIP2AUX adapter contains 1.5 mm touchproof input sockets for standard electrodes like the EASYCAP’s ring electrodes or the actiCAP system’s passive pin electrodes. 

Three connectors are available: one for the ground electrode, one for the reference electrode and one for the signal electrode. The number of BIP2AUX adapters and auxiliary channels needed equals the number of bipolar channels to be used. A maximum of two adapters can be used with the V-Amp amplifier, while it is possible to operate up to eight adapters concurrently with the actiCHamp amplifier. A single ground electrode is sufficient even if more than one adapter is connected to the subject, since the ground signals from the auxiliary inputs are internally bridged both in the actiCHamp and the V-Amp amplifiers.

References: 

BIP2AUX (bipolar-to-auxiliary adapter) - Brain Products Press Release December 2011, Volume 41

BIP2AUX Adapter - www.brainproducts.com