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iAn Bioamp

The iAn Bioamp is a 4, 16, or 32 channel amplifier for neurophysiology recordings. The iAn device models support a wide range of recording modalities for a variety of frequency and electrode impedance ranges.

iA4 Differential Bioamp

The iA4 is a four channel differential low-noise bioamp targeted for use in low channel count, low impedance neurophysiology recordings such as ABR, EEG, EMG, or EKG signals.

Connections to the subject (up to four pairs of channels and ground) are made with standard 1.5 mm touchproof safety connectors.

  • The iA4 includes impedance testing functionality for each of the four recording channels (+) and indifferent channels (-)

  • Manual impedance check buttons simplify testing and debugging of connected electrodes

  • Onboard LEDs provide live feedback of the recording (+) and indifferent (-) channel impedances

See the Hardware Manual for information on iA4 technical specifications.

iA4 Options

iA4 Interface

Select the number of Channels (differential pairs) to read from the iA4.

There are selectable Sample Rate options of ~750 Hz, ~1.5 kHz, ~3 kHz, ~6 kHz, ~12 kHz, ~25 kHz, ~50 kHz or system rate (maximum ~50 kHz). The lowest practical rate improves noise performance.

A user-selectable Highpass filter has adjustable options that are: 0.3 Hz, 1 Hz, 2 Hz, 4 Hz, 8 Hz, 16 Hz, 32 Hz, 64 Hz.

The Save option visualizes and stores the raw signal at run-time.

The Status Display option allows the user to enable the clipping indicators for each channel at run-time.

The Impedance Check option enables online impedance checking. Specify the Target Impedance threshold for the red/green runtime indicator for each channel.

iA4 Runtime Interface

iA4 Runtime Interface

There are Clip indicators on each channel to indicate if the signal is within ~1.5 dB of max input range.

Click the Impedance button to switch the iA4 into impedance checking mode.

iA4 Impedance Check Interface

Users can select a Probe Frequency of 100 Hz, 300 Hz, 500 Hz, or 1 kHz for the impedance check. Take care that you do not choose a frequency that is beyond the Nyquist frequency (~½ the sampling rate defined during designtime).

The (+) and (-) channel impedances are alternately measured every ~110 ms.

iA16 / iA32 Bioamp

The iA16 and iA32 are 16 and 32 channel low-noise bioamps that can operate in shared or true differential mode. They can record signals all the way down to DC.

DB26 connectors mate with TDT's standard headstages to connect to the subject.

  • The iA16/32 includes impedance testing functionality for each of the recording channels and reference

  • Onboard LEDs provide live feedback of the recording channel activity and impedances

See the Hardware Manual for information on iA16 / iA32 technical specifications.

iA16 / iA32 Options

iA32 Interface

Select the number of Channels (differential pairs) to read from the iA16 / iA32. By default, it uses a shared reference input. Optionally select Differential to record true differential where each even channel is the reference for the preceding odd channel.

There are selectable Sample Rate options of ~750 Hz, ~1.5 kHz, ~3 kHz, ~6 kHz, ~12 kHz, ~25 kHz, ~50 kHz or system rate (maximum ~50 kHz). The lowest practical rate improves noise performance.

A user-selectable Highpass filter has adjustable options that are: 0.3 Hz, 1 Hz, 2 Hz, 4 Hz, 8 Hz, 16 Hz, 32 Hz, 64 Hz. The iA16 / iA32 can optionally be DC Coupled as well.

The Save option visualizes and stores the raw signal at run-time.

The Device Display option enables the clipping / activity indicators on the front panel of the module.

The Status Display option allows the user to enable the clipping indicators for each channel at run-time.

The Impedance Check option enables online impedance checking. Specify the Target Impedance threshold for the red/green runtime indicator for each channel.

iA16 / iA32 Runtime Interface

iA16 / iA32 Runtime Interface

At 25 kHz sampling rate and above, the channel indicators flash greeen when there is spike activity. On the front panel of the iA16 / iA32, the channel LEDs are dim green when enabled, and flash brightly with spike activity.

Click the Impedance button to switch the iA16 / iA32 into impedance checking mode.

iA32 Impedance Check Interface

Users can select a Probe Frequency of 100 Hz, 300 Hz, 500 Hz, or 1 kHz for the impedance check. Take care that you do not choose a frequency that is beyond the Nyquist frequency (~½ the sampling rate defined during designtime).

The channels and reference are alternately measured every ~250 ms.