Acoustically evoked cochlear mass potentials were recorded using a low-noise differential preamplifier (Stanford Research Systems, SR560), as described in our previous publication [36 (link)]. The signal input was connected to the trans-tympanic needle electrode, the reference input was connected to an earlobe clamp coated with conductive gel, and the ground input was connected to a standard disposable surface electrode placed at the mastoid, also coated with conductive gel. All contacts were made on the side ipsilateral to the recording. The battery-operated preamplifier was galvanically isolated (A-M systems, Analog stimulus isolator Model 2200) from the mains-powered equipment. Before the signal was recorded (TDT, RX8, approximately 100 kHz/channel, maximum SNR 96 dB), stored, and analyzed (The Mathworks, Matlab), the signal was further amplified (DAGAN, BVC-700A) to a total gain of × 100 k and band-pass filtered (30 Hz–30 kHz; cut-off slopes 12 dB/octave). During the sessions, the most relevant signals were visualized on an oscilloscope (LeCroy, WaveSurfer 24Xs) and monitored with a loudspeaker outside the experimental booth.
Analog stimulus isolator model 2200
Manufactured by A-M Systems
The Analog Stimulus Isolator Model 2200 is a device designed to safely and reliably deliver electrical stimuli to experimental subjects or preparations. It provides electrical isolation between the stimulus input and output, ensuring the safety of both the operator and the subject. The core function of this product is to generate isolated analog electrical signals for use in various research and experimental applications.
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Lab products found in correlation
2 protocols using analog stimulus isolator model 2200
1
Acoustically Evoked Cochlear Mass Potentials
2
Auditory Evoked Potential Measurement
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Auditory evoked potentials were measured using a low noise differential preamplifier (Stanford Research Systems, SR560). All contacts were made on the ipsilateral side to the recording: the signal input was connected to the needle-electrode; the reference input was connected to an earlobe clamp (with conductive gel) and the ground input was connected to a standard disposable surface electrode placed at the mastoid. For safety, the battery-operated preamplifier was galvanically isolated (A-M systems, Analog stimulus isolator Model 2200) from the mains-powered equipment outside the sound booth. Before the signal was recorded (TDT, RX8, ~100 kHz/channel, max. SNR 96 dB), stored and analyzed (MATLAB), the signal was further amplified (DAGAN, BVC-700A) and band pass filtered (30 Hz–30 kHz, cut-off slopes 12 dB/octave). All stimuli and recorded signals were monitored on-line (LeCroy, WaveSurfer 24Xs) during the session.
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