LHBF-48X - NPI Electronic Instruments
Contents
1. 4 FILTER switch Switch to set the LOWPASS and HIGHPASS FILTER switch position FILTER or to bypass the both FILTERS switch position BYPASS BYPASS 5 ZERO ADJUST potentiometer not installed 6 OUTPUT BALANCE monitor Analog monitor that displays the OFFSET in the range of 300 mV for optimal cancellation 7 GAIN rotary switch 10 position rotary switch to set the amplification factor of the incoming signal range to 1000 version 2 1 page 6 LHBF 48X User Manual The OFFSET unit consists of OFFSET RANGE rotary switch 8 and OFFSET potentiometer 9 8 OFFSET RANGE rotary switch 4 position rotary switch to set the RANGE of the OFFSET potentiometer 9 OFF 0 1 V 1 V 10V 9 OFFSET potentiometer 10 turn potentiometer to compensate for the OFFSET of a DC signal The OFFSET range is set by a switch 11 Note Position 5 of the OFFSET control corresponds to 0 mV OFFSET The offset compensation only works if the input coupling switch 10 11 is set to DC and the HIGHPASS FILTER 2 is set to OFF INPUT unit The input coupling unit consists of input coupling switches 10 11 and input connectors 12 13 The position of the input coupling switches decides how the input signals are coupled AC the input signal is AC coupled with a corner frequency of 0 1 Hz e g DC offsets were cancelled DC the input signal is DC coupled 0 the input signal is grounded 10 DC 0 AC2. 1V 410V HIGHPASS MONITOR 8V 47V LOWPASS MONITOR LHBF 48X S000 GROUND T O 0 Figure 2 LHBF 48X front panel view the numbers are related to those in the text below version 2 1 page 5 LHBF 48X User Manual In the following description of the front panel elements each element has a number that is related to that in Figure 2 The number is followed by the name in uppercase letters written on the front panel and the type of the element in lowercase letters Then a short description of the element is given Some elements are grouped in functional units e g INPUT unit and are described as units regardless of the order of numbers 1 POWER pressure switch Switch to turn POWER on switch pushed or off switch released FILTER unit LOWPASS FILTER HIGHPASS FILTER The filter unit consists of 2 HIGHPASS filter optional and 3 1k 13K 2k 10 30 50 LOWPASS filter in 7 ye ne ok 8 300 300 14 0 amp F 8k n ne a 4 N 4 s 100 FTU 13k O37 1 Ik 50 20 20k 0 1 DC 3k Hz Hz 2 LOWPASS filter rotary switch Four pole LOWPASS filter with 24 dB octave Corner frequencies 20 50 100 200 300 500 700 1k 1 3k 2k 3k 5k 8k 10k 13k 20k Hz 3 HIGHPASS FILTER rotary switch optional Single pole HIGHPASS filter with 6 dB octave Corner frequencies 0 1 0 3 0 5 1 3 5 10 30 50 100 300 500 800 1k 3k Hz In DC position the filter is disabled
3. MONITOR connector BNC connector monitoring the position of the GAIN switch 4 1V 10V 1V step 18 HIGHPASS MONITOR connector optional wees BNC connector monitoring the position of the HIGHPASS FILTER switch Sw 7V 48 1V step O p 19 LOWPASS MONITOR connector i BNC connector monitoring the position of the LOWPASS FILTER switch N 7V 48V 1V step 20 GROUND connector Banana plug for grounding This connector is linked to the internal system ground which has no connection to the 19 cabinet and the mains ground to avoid ground loops version 2 1 page 8 LHBF 48X User Manual 3 4 Description of the Rear Panel Figure 3 LHBF 48X rear panel view the numbers are related to those in the text below 1 Mains connector Connector for mains 2 Voltage selector Turning knob for selecting the mains voltage 115 V or 230 V Important Switch always to the appropriate mains voltage before connecting the filter to mains 3 Fuse selector Turning knob for the fuse holder Turn counterclockwise to open Important Use always the appropriate fuse for the present mains voltage before connecting the filter to mains 230 V 0 2 A 115 V 0 4 A slow 4 Cassis connector This banana jack is linked to the chassis It can be used for grounding the housing of the LHBF 48xX 5 Ground connector This banana jack is li
4. 1 3k 2k 3k 5k 8k 10k 13k 20k Hz single pole filter 6 dB octave DC 0 1 0 3 0 5 1 3 5 10 30 50 100 300 500 800 1k 3k Hz 1 2 5 10 20 50 100 200 500 1000 0 1 V 1 Vor l0 V 230V 115V AC 20 W fuse 0 2A 0 4A slow version 2 1
5. D i Electronic Instruments for the Life Sciences pease jade 1C OPERATING INSTRUCTIONS AND SYSTEM DESCRIPTION FOR THE LHBF 48X AMPLIFIER FILTER SYSTEM with 4 pole BESSEL filter VERSION 2 1 npi 2014 npi electronic GmbH Bauhofring 16 D 71732 Tamm Germany Phone 49 0 7141 9730230 Fax 49 0 7141 9730240 support npielectronic com http www npielectronic com LHBF 48X User Manual Table of Contents kode eer eat 128 19 Kcgueentnaa er aerate tre ea geen eet near re en ot ete ears Ue CETaSS el N 3 Zo AAD Oe COMpPOn cil Sariana iotaeesasntenhicg cat cated ual A 4 Oy LHBFASX AMPUN FP atea a a aa 4 Fele zo yte DESCENDU O eriei a E 4 SoZ to lO Mal POW DIIS a ieee a E E ER 4 3 3 Description of the Front Panel and Operation eeesesessesssssssssssssssssesssseseeeeeererrereeeees 5 3 4 Description of the Rear Pane baz ie us sis a cenutnstntindacanccdeeteneieasuecdnaleseaaudet ls E aT 9 ie NMSA CNG E E sea A T A A E E ace ec cose sansa E ee ete 9 Te a fire i Bc Meee ene cee nrren erer E gare T renrrerre nr irre 10 version 2 1 page 2 LHBF 48X User Manual 1 Safety Regulations VERY IMPORTANT Instruments and components supplied by npi electronic are NOT intended for clinical use or medical purposes e g for diagnosis or treatment of humans or for any other life supporting system npi electronic expressively disclaims any warranties for such purpose Equipment supplied by npi electronic shall be operated onl
6. d LOWPASS filter The four pole Bessel LOWPASS FILTER has sixteen corner frequencies 20 Hz 20 kHz The LOWPASS FILTER can also be bypassed by using a toggle switch The one pole HIGHPASS FILTER has fifteen corner frequencies 0 1 Hz 3 kHz and a DC position The OFFSET is indicated by an analog meter range 30 mV The OFFSET cancellation range is 0 1 V to 10 V The OFFSET is cancelled by setting two controls a ten turn potentiometer and a 0 1 V 1 V 10 V range switch DC offsets can be compensated either by the using the OFFSET control or they can be eliminated using the AC position of the input switches or by using the HIGHPASS filter The positions of GAIN and FILTER switches can be read from monitor outputs 1 V step 3 2 Signal Flow Diagram The signal is passed through the LHBF 48X as shown below OFF FIN gt AC 0 DC or not FILTER BYPASS FILTER Selection Differential Offset installed or not installed BYPASS Inout na Compensation 7 Oe ee me CIN gt AC 0 DC inp Selection Notch Highpass Lowpass Filter Filter Filter Figure 1 signal flow diagram version 2 1 page 4 LHBF 48X User Manual 3 3 Description of the Front Panel and Operation OUTPUT BALANCE x10mV BYPASS ZERO ADJUST NOTCH FILTER HIGHPASS FILTER TITI PP pre LOWPASS FILTER npi GAIN MONITOR
7. nked to the internal system ground which has no connection to the 19 cabinet and to mains ground to avoid ground loops 4 Literature Kettenmann H amp Grantyn R eds 1992 Practical Electrophysiological Methods WileyLiss New York Ogden DC 1994 Microelectrode Techniques The Plymouth Workshop Handbook Second Edition The Company of Biologists Limited Cambridge Tietze U and Ch Schenk 1999 Halbleiter Schaltungstechnik Semiconductor Techniques 11 Edition Springer Berlin Heidelberg New York English version available Windhorst U and H Johansson eds 1999 Modern Techniques in Neuroscience Research Springer Berlin Heidelberg New York version 2 1 page 9 LHBF 48X User Manual 5 Technical Data Input Input range Input impedance AC coupling at input Differential input Output Full power bandwidth Range of output Output impedance Overload LED threshold Gain monitor Frequency monitors Lowpass filter Filter type Attenuation Corner frequencies Hz Highpass filter optional Filter type Attenuation Corner frequencies Hz Gain Ten steps Offset compensation Three ranges Power r eq uirements 19 rackmount cabinet 12 V 1 MQ Corner frequency of 0 1 Hz CMR gt 90 dB 30 kHz max 12 V 50 Q 10 V 1V switch step 1V 10V 1V switch step 8V 7V 4 Pole Bessel filter 24 dB octave 20 50 100 200 300 500 700 1k
8. s connecting or disconnecting sensors headstages or other components from the instrument or 19 cabinet TEMPERATURE DRIFT WARM UP TIME All analog electronic systems are sensitive to temperature changes Therefore all electronic instruments containing analog circuits should be used only in a warmed up condition 1 e after internal temperature has reached steady state values In most cases a warm up period of 20 30 minutes is sufficient HANDLING Please protect the device from moisture heat radiation and aggressive chemicals version 2 1 page 3 LHBF 48X User Manual 2 LHBF 48X Components The following items are shipped with the LHBF 48X amplifier filter OQ LHBF 48xX 19 cabinet Power cord User manual 3 LHBF 48X Amplifier Filter 3 1 System Description The LHBF 48X amplifier filter is designed for processing small bio electrical signals The input voltage range is 12 V Two overload LEDs indicate that the amplifier is going to leave its linear range 12 V 1 e that the OUTPUT voltage exceeds 10 V All inputs and outputs are BNC connectors The unit is equipped with a differential input stage with an AC 0 DC switch for each input The input stage is followed by the offset compensation see Figure 1 The GAIN stage allows amplification of the signal from 1 1000 in 1 2 5 steps The GAIN is selected by an 10 position rotary switch The amplified signal is passed through the HIGHPASS optional an
9. switch Switch to select the coupling of an incoming signal AC or DC for IN Position O links the respective INPUT connector 13 to ground 11 DC 0 AC switch Switch to select the coupling of an incoming signal AC or DC for IN Position 0 links the respective INPUT connector 12 to ground 12 IN connector BNC connector to connect the signal to be processed 13 IN connector BNC connector to connect the signal to be processed version 2 1 page 7 LHBF 48X User Manual The INPUTS can be used in single ended or differential configuration For single ended operation connect the signal to be processed to the IN or IN connector and set the other not used input to ground using the respective toggle switch set 11 or 12 to 0 position In differential configuration the signal that is connected to IN is subtracted from the signal that is connected to IN Important If only one INPUT is used single ended configuration the other should be linked to ground see also 10 11 to avoid coupling of noise 14 OVER LEDs Two overload LEDs indicating that the amplifier is going to leave its linear range 12 V 1 e that the OUTPUT voltage exceeds 10 V 15 OUTPUT connector BNC connector providing the processed signal 16 NOTCH FILTER switch optional Switch to set the NOTCH FILTER 50 Hz 60 Hz switch position NOTCH Bz FILTER or to bypass the NOTCH FILTER switch position OFF 17 GAIN
10. y by selected trained and adequately instructed personnel For details please consult the GENERAL TERMS OF DELIVERY AND CONDITIONS OF BUSINESS of npi electronic D 71732 Tamm Germany 1 2 3 4 5 GENERAL This system is designed for use in scientific laboratories and should be operated by trained staff only General safety regulations for operating electrical devices should be considered AC MAINS CONNECTION While working with the npi systems always adhere to the appropriate safety measures for handling electronic devices Before using any device please read manuals and instructions carefully The device is to be operated only at 115 230 Volt 60 50 Hz AC Please check for appropriate line voltage before connecting any system to mains Always use a three wire line cord and a mains power plug with a protection contact connected to ground protective earth Before opening the cabinet disconnect mains power plug Disconnect mains power plug when replacing the fuse or changing line voltage Replace fuse only with an appropriate specified type STATIC ELECTRICITY Electronic equipment is sensitive to static discharges Some devices such as sensor inputs are equipped with very sensitive FET amplifiers which can be damaged by electrostatic charge and must therefore be handled with care This can be avoided by touching a grounded metal surface when changing or adjusting sensors Always turn power off when adding or removing module
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