(DP-314) Four Channel Differential Amplifier with Active Headstages

Active Headstages for Low Noise

High Input inpedance, High Common Mode Rejection

High common mode rejection is very important in minimizing electrical interference. The high input resistance of the DP-314 (10¹²  Ω typical) ensures that the instrument's high CMR will not be degraded by differences in source impedance. This is important for extracellular recording where the difference in resistance between the recording and indifferent electrode is often very large.

High DC Tolerance

Extracellular action potentials are typically measured in microvolts but are usually accompanied by much larger DC electrode voltages. The DP-314 is designed to amplify these µV level events with as much as ±10 VDC at the input.

High Gain, Low Noise, & Bandwidth Limiting

With gain selections at x10, x100, x1000 and x10,000, even µV signals are sufficiently amplified for computer and recorder inputs. Noise is very low, typically 10 µV p-p at 1 Hz to 10 kHz bandwidth. Reducing the bandwidth with the low pass and high pass filters can further lower the noise.

Calibration Signal

An internal Cal signal provides a convenient check of amplifier gain and operation.