Digitimer NeuroLog NL824 Manuale d'uso - Pagina 4

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Users Manual
Electrical operation of the mute facility is available via the NL820A module to maintain isolation of the amplifier
inputs from the logic signal and ground. See the NL820A section of this manual for further details.
Some applications will require reduction of the amplifier bandwidth to enhance the signal/noise ratio. Generally
this requirement will be satisfied by reducing the high frequency response of the system. The filtering required
will vary with application and has not been included in the NL822 or NL824 amplifiers in order to maintain small
size. Where the system includes the NL820A and the NeuroLog™ rack, the NL125 or NL126 can be used to
give comprehensive continuous control of upper and lower frequency cut-off points. Low frequency cut-off is not
usually required to be finely adjustable over such a large range and therefore in most applications the three
step control switches provided for each channel will be adequate.
Multiple System
Two channel and four channel amplification requirements are covered by NL822 and NL824 units provided the
input signals are relative to a common point with less than 1 volt common mode potential. If measurements are
to be made from differing potential points then isolation will be required between these points and an NL820A
signal and supply isolator will be required to operate amplifiers from each point. For example two channels
referenced to point A and four channels referenced to point B. Potential between common points A and B 240V
50Hz.
Solution
Where more than four channels are required, even though all are referenced to the same point, multiples of
NL822 and NL824 units will be required and if isolation is required then one NL820A will be required for each
group of four channels.
Dimensions
Size:
NL822- 70 x 60 x 110 mm (W x H x D)
NL824- 90 x 60 x 155 mm (W x H x D)
Lead length:
2.5m (nominally)
Last Revision:
March 4, 1998
File Reference:
N:\DOCS\COMPANY\MANUALS\NEUROLOG \ NL822824.SAM
Digitimer Ltd
NeuroLog™ System
- One NL822 and one NL820A for point A system
- One NL824 and one NL820A for point B system
First Issued:
Tel:+44 (0)1707 328347; Fax:...373153
before July 1984
Page 4 of 4
NL822/824
Copyright © 1992-8
Website: www.digitimer.com