NL125/6
- Band-Pass Filter (with 50/60Hz Notch) |
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The
NL125/6 band-pass filter module employs two active sections
to control the high and low pass characteristics. The low
frequency cutoff point can be set continuously from 0.5Hz
to 5kHz with a single turn potentiometer, in four switched
ranges. Similarly the high frequency cutoff can be set
continuously from 5Hz to 50kHz in four switched ranges. DC
and WB (wide band) switch positions by-pass the lower and
upper filter sections, respectively. A switcheable active notch
filter is provided for the rejection of line frequency
interference; this can be set by the user to 50Hz or 60Hz, with a 20Hz notch width (-3dB points).
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NL134/5/6
- Four Channel Low Pass Filters |
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The
NL134/5/6 FILTERS are 4-channel, second order (two-pole)
low-pass with mains frequency Notch reject (NL135/6 only)
filter modules. They are ideal partners for the NL820
Isolated Amplifier system. The filter settings have
been selected for most electrophysiological protocols but
other frequencies can be factory set to order. A
rotary switch selects the 14 frequency settings giving
repeatability over a wide range with 12dB/octave
[40dB/decade] attenuation above the selected frequency
value. The 'WB' (wide-band) switch position by-passes the
filter sections completely (both LP and Notch).
The
active Notch filter provides rejection of line frequency
[50Hz (NL135) or 60Hz (NL136)] interference when switched
in. (No switch is fitted on the NL134).
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NL143
- Three Channel Difference Amplifier
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The
NL143 is a 3-channel difference, or differential,
amplifier with 4-channels of input. Internal selection
allows the difference between any of the four input
channels to be made. Internal preset controls
(finger operated) allow an offset to be nulled or added as
required. High input protection allows for signals
coming from units that are not part of the NeuroLog
System. This module allows the difference between
two signals of interest to be continuously monitored, but
can also be used to null DC offsets introduced by
computer DAC interface cards.
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NL144
- Four Channel High Pass Filter
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The
NL144 is a 4-channel, second order (two-pole) high pass
filter which complements the NL134/5/6 mentioned
above. when used with the NL820A isolator, these
module provide a compact solution to 4 channel high and
low pass filtering.
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NL530
- Signal Conditioner |
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A
single width module designed to give gain and offset
set-up controls when interfacing signals to the
analog-to-digital converters (ADCs) of PCs. The
module contains four channels each with independently
adjustable filter settings and front panel gain and offset
presets. There is also a master ADC offset control to
allow unipolar ADCs to be used with bipolar signals.
As ADC boards have a precise input range (outside of which
damage may occur) the module features on-board preset
controls to set all channels to 'CLIP' (or limit) at
independently set positive and negative (or zero) levels.
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