ADInstruments BIO, Руководство пользователя

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Owner’s Guide
42
signals, respectively. Note that the settings for one filter type may restrict the possible
settings for the other.
High-Pass Filtering. The High Pass pop-up menu gives the choice of 100 Hz and 300
Hz high-pass filters. The high-pass filter removes frequencies below the selected cut-off
frequency and allows high frequencies in the signal to pass. Note: this amplifier is not
suitable for DC recording.
Low-Pass Filtering. The Low Pass pop-up menu gives the choice of 1 kHz, 2 kHz and
5 kHz low-pass filters. The low-pass filter removes high-frequency components above
the selected cut-off frequency and allows lower frequencies in the signal to pass. These
filters are useful for removing high-frequency signals, such as noise, and to prevent
aliasing in the recorded signal (see page 24).
Mains Filter. Select or deselect the Mains filter checkbox to turn the mains filter on and
off . The mains filter allows you to remove interference related to the mains frequency
(both fundamental and harmonic frequencies). This is an adaptive filter. It adjusts to
filter the interference by tracking the input signal for a second, creating a template of
the interfering frequencies and then subtracting this template from the input signal.
Because of this, in general, using the mains filter is a good option. However, the mains
filter does have some limitations, such as not being useful for very short recordings of
less than one second. More details on the mains filter can be found in the
LabChart
Help Center .
Inverting the Signal
The Invert checkbox provides a simple way to change the polarity of the recorded signal
without having to swap the connections to the recording electrodes.
Types of Measurement
The low noise and high gain of the Neuro Amp EX makes it suitable for all recordings
that require a high bandpass (300 Hz – 5 kHz) and a high signal-to-noise ratio. Such
recordings may include extracellular recordings from single cells or groups of cells, or
from nerve fibres (split-nerve preparation or human microneurography). The headstage
provides a gain of 100x and the cable shielding is directly connected to the casing,
limiting the need for additional shielding at the input terminals.
Note: The Neuro Amp EX is not suitable for intracellular recording with glass
microelectrodes.
The Neuro Amp EX Headstage
The headstage can be mounted in a micromanipulator for animal use or taped directly
to the skin of a human subject. The casing of the headstage is connected to the shielding
of the cable, thereby providing shielding up to the input terminals. Three female gold
plated miniature sockets provide inputs on the headstage. The positive and negative