Hardware

Systems

RA8GA

Adjustable Gain PreAmp (General-Purpose Digitizer)

The Adjustable Gain PreAmp is a general-purpose digitizer that acquires and digitizes multi-channel data from a variety of analog voltage sources including eye-trackers, intracellular or extracellular amplifiers, pH meters, and temperature sensors. The operating range on all channels is controlled by manually setting the maximum input range to ± 0.1V, 1.0V, or 10.0V. The preamp uses a 25-pin connector for analog input and can be used with our patch panel to streamline connection. Digitized signals are sent over a fiber optic cable to a DSP base station, such as the Pentusa or Medusa, where they are filtered and processed in real-time. For a complete high-count, general-purpose solution, consider the RX8.

Part number: RA8GA-2

Technical specifications:

A/D:	8-channels 16-bit PCM
Maximum voltage in:	Variable gain settings allow +/-10 V, +/-1 V or +/- 100 mV
A/D sampling rates:	~ 6, 12, or 25 kHz
S/N (typical):	70 dB for 1 kHz output at +/- 9.9 V
THD (typical):	< - 70 dB for 1 kHz output at +/- 9.9 V and +/- 900 mV
Crosstalk:	< - 70 dB (DC - Nyquist)
DC offset:	< 5 mV at +/- 10 V < 3 mV at +/- 1 V and +/- 100 mV
Frequency response:	DC - 7.5 kHz
Lowpass filter:	7.5 kHz (3dB corner, 2nd order, 12 dB per octave)
Input impedance:	> 10 kohm
Power and communication:	zBus required