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22

PowerLab Owner’s Guide

used together. Also, whenever possible, avoid using cable joiners
and junctions to extend cable lengths.

7.

Never attempt to make your own SCSI cable, or modify one.

SCSI is sensitive to cable impedances and cable lengths. Only use
an approved SCSI cable from a reliable supplier, never ‘something
the workshop whipped up’. If you need additional SCSI cables,
you should buy cables that are double-shielded (foil and braid),
with twisted pairs and shielded connector hoods for the most
reliable results. ADInstruments sells approved SCSI cables

Setting the SCSI ID Number

Your PowerLab was set to a SCSI ID number of 4 at the factory before
shipping. To change its SCSI ID, turn off the PowerLab, and all other
connected devices in the SCSI chain, before changing the SCSI ID
number. The SCSI ID switch is located on the back panel of the
PowerLab. A small panel with push buttons above and below it
displays the SCSI ID number. Press the [–] button above the indicator
to decrease it or the [+] button below the indicator to increase it.

Do not set the SCSI ID to numbers already used by other SCSI devices
in the chain. The maximum number of devices within the same SCSI
chain is eight. Each device in the chain must have a unique SCSI
identification number assigned to it. The numbers range from 0 to 7,
with 7 the highest priority device. A computer with built-in SCSI
usually reserves the values 0 and 7. On the Macintosh, 7 is used for
the computer and 0 may be used for an internal SCSI hard disk (an
internal SCSI CD, if there is one, usually takes ID 3, as well). On a PC,
SCSI ID number 7 is usually reserved by a SCSI card host adapter or
built-in SCSI controller, and SCSI ID number 0 is used by an internal
SCSI hard disk, if there is one. To prevent most problems, therefore,
the numbers 0 or 7 cannot be used for an

SP

series PowerLab.

Externally connected devices should have readable SCSI ID switches
you can check, although some may have ID switches that are difficult
to see or read. Internally connected devices should be described in the
manual that came with your computer. If you are unsure about the
SCSI devices connected to a Macintosh computer, you can use tools
such as SCSIProbe (a free utility available from the Internet and user
groups), which lists all SCSI devices attached, what they are, and
which SCSI ID they use. If you are unsure about the SCSI devices

4

Figure 2–4

The SCSI ID switch

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Содержание PowerLab/16SP

Страница 1: ...1 Input 2 Input 4 Output 1 Output 2 SP Status Power PowerLab 8 ADInstruments Trigger Input 3 Input 1 Input 2 Input 4 Input 7 Input 5 Input 6 Input 8 Output 1 Output 2 SP Status Power PowerLab 16 ADInstruments Trigger Input 7 Input 15 Input 8 Input 16 Input 6 Input 14 Input 5 Input 13 Input 3 Input 11 Input 4 Input 12 Input 2 Input 10 Input 1 Input 9 Output 1 Output 2 SP Status Power ...

Страница 2: ...ademarks of Apple Computer Inc Power Macintosh iMac and System 7 are trademarks of Apple Computer Inc PowerPC is a trademark of International Business Machines Corporation Pentium is a registered trademark of the Intel Corporation Windows and Windows 95 are registered trademarks of Microsoft Corporation Windows NT is a trademark of Microsoft Corporation All other trademarks are the properties of t...

Страница 3: ...Rules 20 Setting the SCSI ID Number 22 SCSI Termination Rules 23 Connecting the PowerLab Macintosh 23 Connecting the PowerLab Windows 24 SCSI Strikes Back 26 A Technical Aspects 27 How Does it Work 27 The Analog Inputs 31 PowerLab Accuracy 33 The External Trigger 33 The Analog Output 34 Connections 35 USB Port 35 SCSI Port 35 I2 C Expansion Port 36 Digital Input and Output Ports 37 Pod Connectors ...

Страница 4: ...iv PowerLab Owner s Guide ...

Страница 5: ...Amp ML117 BP Amp and ML180 front ends conform to international safety requirements Specifically these requirements are IEC601 1 and its addenda Table S 1 and various harmonised standards worldwide UL2601 1 in the USA and AS NZS3200 1 in Australia and New Zealand In accordance with European standards they also comply with the electromagnetic compatibility requirements under EN60601 1 which encompas...

Страница 6: ...s that protection against electric shock in the event of a fault relies on a direct connection through the power cable to your building s earth conductor The power cable supplied with your PowerLab provides the required ground connection to the power outlet If your building does not have power outlet sockets with a good ground connection then you may use the ground connection on the rear of the Po...

Страница 7: ...o the heart Cleaning and Sterilisation This system is not supplied with materials or components likely to need sterilisation If you need to clean peripherals likely to be in contact with different subjects they can be cold sterilised with an appropriate sterilising agent No part of the system can be autoclaved Storage It is recommended that the hardware be kept below 40 C and above 0 C in a moistu...

Страница 8: ...oid the warranty If you so wish your PowerLab system can be periodically checked for basic medical safety by using an appropriate medical safety testing device Tests such as earth leakage earth bond insulation resistance patient leakage and auxiliary currents and power cable integrity can all be performed on the PowerLab system without having to remove the covers You should follow the instructions...

Страница 9: ...ised application programs provides a versatile data recording and analysis system when used with a Windows or Macintosh computer This chapter provides an overview of the PowerLab system and describes the basic features connectors and indicators of the SP series PowerLabs the PowerLab 4SP PowerLab 8SP and PowerLab 16SP ...

Страница 10: ...cording unit yourself you void any rights you have under warranty The user s guides for the Chart and Scope application programs provide detailed information on the software side of the PowerLab system and its uses in acquiring storing and analysing data Read them after you have connected the PowerLab to your computer First Check Your PowerLab Please do not attempt to connect the PowerLab to a pow...

Страница 11: ...e ancillary devices front ends the software consists of the application programs such as Chart and Scope that run on the computer to which the PowerLab is connected Your SP series PowerLab has considerable computing power of its own and performs many tasks that are necessary during data recording Once the PowerLab transfers the data to the computer the data are available for display manipulation p...

Страница 12: ...staller CD Macintosh These requirements assume you are using the latest version of Chart An older version of Chart is available for use with older Macintosh computers A Power Macintosh computer or computer with a PowerPC microprocessor 32 MB free RAM 64 MB recommended Mac OS 8 6 or later Mac OS 9 0 or later recommended Additional requirement for USB A USB interface on your computer this may be add...

Страница 13: ...al signals PowerLabs should never be connected to humans directly unless it is through connections marked as safe A PowerLab can have as many front ends connected to it as it has analog inputs roughly speaking Front ends are easily added to or transferred between PowerLabs They are automatically recognised by the PowerLab system and seamlessly integrated into its programs operating under full soft...

Страница 14: ...put 16 for recording external signals PowerLab 4 ADInstruments Trigger Input 3 Input 1 Input 2 Input 4 Output 1 Output 2 SP Status Power Power light Status light Trigger light Trigger Analog output connectors Analog input connectors PowerLab 8 ADInstruments Trigger Input 3 Input 1 Input 2 Input 4 Input 7 Input 5 Input 6 Input 8 Output 1 Output 2 SP Status Power Power light Status light Trigger lig...

Страница 15: ... input Single ended inputs record the difference between signal and ground and differential ones record the difference between positive and negative input signals Do not attempt to record from both the BNC and Pod connectors for an input at the same time or the signals will compete Status Indicator Meaning Off Idle and not yet initialised by the software Yellow flashes When the PowerLab is powered...

Страница 16: ...independent analog inputs marked Input 1 to Input 16 All inputs are single ended with the signal referenced to ground and have only positive connectors Analog Output The PowerLab can generate a stimulus voltage through its analog output sockets marked Output 1 and Output 2 giving positive negative differential or independent stimuli depending on the sockets used and the software settings By defaul...

Страница 17: ...e SCSI connection This works with USB 1 1 compliant computers with USB connectors or a USB card USB needs a Power Macintosh with Mac OS 8 5 or later or a PC with Windows 98 or later A USB connection is a bit slower than SCSI for data transfer and so may limit sampling rates in Chart or increase delay times between sweeps in Scope but it is less fussy You can safely turn on or off or disconnect or ...

Страница 18: ...at the end of a SCSI chain It is terminated internally but the termination can be switched on and off using the SCSI Termination switch beside the SCSI connector it should be on The SCSI ID Switch The SCSI ID switch is there if you need to change the SCSI ID number of your PowerLab The PowerLab is factory set to an identification number of 4 The SCSI ID can be changed simply by pressing the contro...

Страница 19: ...al input and output connectors are given later in this guide please refer to the descriptions before attempting to connect equipment to them More information on the use of digital inputs and outputs is given in the user s guide for the software Ground Connection A special earthing grounding stud has been provided on the rear of the PowerLab This is an equipotential bonding connection post compatib...

Страница 20: ...Lab and lever the fuse holder out using the tab at its left which is recessed in the power socket The fuse holder contains two slow blow fuses which protect your PowerLab from power surges Replacement fuses must be of the correct type as specified below for 100 120 volts or 220 240 volts operation 100 120 V 1 Amp 5 20 mm slow blow voltage rating 120 or 250 V Fuse holder Power switch Power socket F...

Страница 21: ...g fan is visible in the rear panel of the PowerLab It maintains sufficient airflow in the enclosure to keep the circuitry within operating tolerances The fan outlet must be kept unobstructed and far enough from walls or other devices at least three inches 8 cm so as to not impede ventilation It is also important to make sure that the air inlets underneath the PowerLab are unobstructed Blocking the...

Страница 22: ...14 PowerLab Owner s Guide ...

Страница 23: ...s with the PowerLab s internal self test then looks at the USB connection It also looks at the SCSI connection in some detail including connection and termination rules and setting the SCSI ID number It discusses how to connect up your PowerLab to a Windows or Macintosh computer ...

Страница 24: ...nds no problems the Status indicator turns off showing that the PowerLab is idle it only goes green when the software is running If the indicators perform as described above then your PowerLab has successfully performed its internal self test and it can be safely connected to your computer If your PowerLab would not successfully complete its self test something is wrong If the Power indicator does...

Страница 25: ...o repair the PowerLab yourself If your PowerLab has successfully performed its internal self test read on to find out how to connect it to your computer The USB Connection This section is essential reading before trying to use your PowerLab with USB The PowerLab is fitted with a USB universal serial bus port which provides an alternative to the SCSI connection This works with USB 1 1 compliant com...

Страница 26: ...r data transfer and so may limit sampling rates in Chart or increase delay times between sweeps in Scope Since all the devices on a USB tree have a common communication pathway if you have many devices with a lot of information to transfer they compete for time Using a video camera and a scanner at the same time as a PowerLab may limit the sampling rates considerably USB has two sorts of cables wh...

Страница 27: ... the computer there might not be any icons on the card The narrow rectangular sockets for the USB A plug are distinctive though Any USB icons on the plugs should be on top USB Connection Rules 1 Cable length should be less than 5 metres 16 feet between devices Devices include USB hubs There are a maximum of five hubs on any branch so the maximum distance between the computer and the Powerlab is 30...

Страница 28: ...Lab while the computer remains on as long as the application program Chart or Scope is off when you do it The SCSI Connection This section is essential reading before trying to use your PowerLab with SCSI The user s guide for your computer may have a section on connecting SCSI devices in which case you should read that as well The PowerLab is fitted with a SCSI port which provides an alternative t...

Страница 29: ...up The correct way of terminating is discussed later 5 Turn SCSI devices on and off in the right sequence Turn on all external SCSI devices before the computer this ensures that the SCSI bus is stable before your computer tries to use it Turn off the computer before turning off other devices This prevents external SCSI devices from hanging the SCSI bus and preventing further access Never operate w...

Страница 30: ...devices in the chain The maximum number of devices within the same SCSI chain is eight Each device in the chain must have a unique SCSI identification number assigned to it The numbers range from 0 to 7 with 7 the highest priority device A computer with built in SCSI usually reserves the values 0 and 7 On the Macintosh 7 is used for the computer and 0 may be used for an internal SCSI hard disk an ...

Страница 31: ...rovide safe and reliable high speed data transfer provided that you follow the rules for proper termination A SCSI chain is correctly terminated by placing terminators at each end of the chain The computer is terminated internally so forming one end of the chain A SCSI host adapter will be terminated if the SCSI controller and internal SCSI hard disk are both terminated you may have to alter thing...

Страница 32: ...s ultra wide SCSI and the like ADInstruments sells SCSI cards and cables with which the PowerLab should work reliably It may not be possible to find a cable to fit all connections though Make sure that you have the correct SCSI cable to connect up your PowerLab It requires a 25 pin D style connector for the PowerLab If you have a portable computer with a PC card SCSI adapter then the card probably...

Страница 33: ...SCSI device to connect to the computer then simply connect the two together with the correct SCSI cable and turn the SCSI termination switch on If you wish to use multiple SCSI devices with the computer the first and last devices in the chain should be terminated The PowerLab must be at the end of the chain since it has only one SCSI connector and its internal terminator must be switched on SCSI C...

Страница 34: ...l and may take some effort to set up It will probably require assistance from a PC technical support person SCSI Strikes Back Not following the SCSI device connection and termination protocols can lead to more problems than you might think The possible dangers include loss of data intermittent communications corruption of data on a SCSI hard disk failure of the computer to boot from a SCSI drive a...

Страница 35: ...ious functions needed for data acquisition signal conditioning and pre processing It contains its own microprocessor memory and specialised analog amplifiers for signal conditioning The block diagrams in Figure A 1 Figure A 2 and Figure A 3 show the essential elements of each PowerLab All sampling output and communication functions are controlled by an internal 32 bit 68340 microprocessor running ...

Страница 36: ...rLab 4SP eight PowerLab 8SP or 16 PowerLab 16SP analog inputs used to record external signals The outputs of their input amplifiers are multiplexed to a 16 bit ADC Figure A 1 Block diagram of the PowerLab 4SP A A A A A A A A A AAAAAAAAAA POWER SUPPLY AA AA AA SCSI Port USB Port External Trigger MC68340 CPU DigitalOutput DigitalInput I C Port 2 A A A LATCH SAMPLING CONTROL LOGIC SCSI Controller LAT...

Страница 37: ...ckly This frees the CPU from the need to read every sample from the ADC as it is ready so that it can perform other tasks The external trigger input marked Trigger on the front panel is connected to a comparator circuit that triggers when the input Figure A 2 Block diagram of the PowerLab 8SP 50 60Hz MAINS SYNC POWER SUPPLY A A SCSI PORT USB Port Ext Trigger MC68340 CPU Digital Output Digital Inpu...

Страница 38: ...rs are used to control the analog outputs of the PowerLab marked Output 1 and Output 2 on the front panel The DACs produce waveforms under software control that are fed through an attenuation network to produce different full scale ranges The signals are then buffered by a power 50 60Hz MAINS SYNC POWER SUPPLY A A SCSI PORT Ext Trigger Digital Output Digital Input LATCH LATCH 16 BIT ADC Analog Inp...

Страница 39: ...pply not a switching power supply which makes it a little heavier but a lot quieter electrically It is important to note that the PowerLab has a limited amount of power available for external devices Because of these power restrictions you should not use the PowerLab as a power source for external devices other than front ends produced by ADInstruments The Analog Inputs PowerLab input amplifiers h...

Страница 40: ... readings The operation of the input amplifiers is illustrated by the block diagrams below The input amplifiers can be set to pass both DC and AC signals or to pass only AC signals without passing DC signals Input impedance is one megohm 1 MΩ AC DC coupling control 50 Hz low pass filter Instrument amplifier Channel control bus BNC Analog input Grounding and input selection 1 MΩ AC DC coupling cont...

Страница 41: ...ure and age is measured The measured voltage is removed from the readings for that input through software correction in a process transparent to the user Calibration facilities It is recommended and sound practice to calibrate a measuring system from the transducer to the output After applying two known values to a transducer say at 20 and 80 of full scale and recording the signal you can use the ...

Страница 42: ...own below protects the optocoupler The Analog Output The analog outputs provide computer controlled variable outputs 10 V that can be used with the Chart and Scope applications either directly as a stimulator or to control peripheral devices All stimulation voltage is generated by the PowerLab via the output sockets on the front of the PowerLab marked Output 1 and Output 2 giving positive negative...

Страница 43: ...e attempting to connect cables other than those supplied with the unit to the PowerLab Using cables that are wired incorrectly can cause internal damage to the PowerLab and will void your rights under warranty USB Port The PowerLab is fitted with a USB universal serial bus port which provides an alternative to the SCSI connection This works with computers with USB connectors or a USB card USB need...

Страница 44: ...or ADInstruments front ends This port provides both power and control signals for these front ends The I2 C bus has a daisy chain structure that allows simple connection of additional front ends to the system A PowerLab can have as many front ends connected to it as it has analog inputs roughly speaking You should not attempt to run other external devices from the I2 C port it is designed for use ...

Страница 45: ...od connectors on the PowerLab 4SP are 8 pin DIN connectors The PowerLab 8SP and PowerLab 16SP have single ended BNC inputs only Do not attempt to record from both the BNC and Pod connectors for an input at the same time or the signals will compete Pod connectors allow the connection of ADInstruments Pods small low cost units that provide alternatives to front ends for specific tasks for use with p...

Страница 46: ... a very weak signal Transducers designed for direct connection can be provided with power and control since the Pod connectors provide some functions of the I2 C output as well as alternative analog inputs to the BNC connectors Input Input DigitalGround Negative 5 V Positive 5 V Analog Ground SDA SCL Input ref Figure A 12 The pin assignments for the Pod connector ...

Страница 47: ... SCSI difficulties can cause data loss failure of the computer to recognise that SCSI devices are attached to it and difficulties using other SCSI devices Incompatible SCSI adapter cards and cables may also cause problems Obviously the SCSI problems will not apply if you use USB The PowerLab Status indicator light flashes yellow then red when the PowerLab is turned on If the pattern is simply an a...

Страница 48: ...r or bad cable Ensure that the cable is firmly attached at both ends and try again If there is still a problem try a new cable SCSI problems two SCSI devices on the bus have the same SCSI ID or termination is incorrect or unsuitable Check that each device has a unique ID number and that the SCSI chain is terminated correctly As a last resort if the PowerLab is the only connected SCSI device try le...

Страница 49: ...owerLab doesn t work or the program crashes after a short time A poor connection between PowerLab and computer or bad cable Ensure that the cable is firmly attached at both ends and try again If there is still a problem try a new cable SCSI problems two SCSI devices on the bus have the same SCSI ID or termination is incorrect or unsuitable Check that each device has a unique ID number and that the...

Страница 50: ...SP You may be using both the BNC connector and the Pod connector for an input at the same time with resultant signal competition Make certain that you use only one of the alternative connectors BNC or Pod for an input when recording Problems Windows Most problems that users encounter are connection problems and SCSI problems Improper connections can result in a loss of all or some of a signal SCSI...

Страница 51: ... to install a driver Leave the wizard on its default settings and click the OK button Insert the CD or Disk 1 of the provided installation disks The PowerLab setup information file should be selected in the dialog box that appears Click the OK button and continue There is an alert about ASPI when the software starts up ADInstruments software needs ASPI advanced SCSI programming interface to commun...

Страница 52: ...tly As a last resort if the PowerLab is the only connected SCSI device try leaving it unterminated The computer is running off a SCSI hard drive and the PowerLab has an internal problem or has hung Turn everything off and then after at least five seconds turn the PowerLab back on again Turn on the computer and try using the software again The computer can t find the PowerLab The PowerLab is off or...

Страница 53: ...B and the computer does not properly support USB USB needs a USB 1 1 compliant PC with Windows 98 Me 2000 or later it simply will not work with earlier operating systems such as Windows 95 or Windows NT 4 use SCSI with these The computer hangs up while recording or there is data loss A poor connection between PowerLab and computer or bad cable Ensure that the cable is firmly attached at both ends ...

Страница 54: ...problem try a new cable SCSI problems two SCSI devices on the bus have the same SCSI ID or termination is incorrect or unsuitable Check that each device has a unique ID number and that the SCSI chain is terminated correctly As a last resort if the PowerLab is the only connected SCSI device try leaving it unterminated Signals seem weak or interacting on the PowerLab 4SP You may be using both the BN...

Страница 55: ... only through the Pod connectors Amplification ranges 2 mV to 10 V full scale in 12 steps 10 V 5 V 2 V 1 V 0 5 V 0 2 V 0 1 V 50 mV 20 mV 10 mV 5 mV 2 mV Maximum input voltage 15 volts Input impedance 1 MΩ 47 pF DC Low pass filtering 1 2 5 10 or 20 kHz software selectable AC coupling DC or 0 1 Hz software selectable Frequency response 3 dB 20 kHz 10 V full scale all ranges ...

Страница 56: ...ng ADC resolution 16 bits 150 µV resolution at 10 V range Linearity error 1 LSB from 0 C to 70 C Maximum sampling rates 200 kHz on one channel 100 kHz on two channels 40 kHz on three or four channels Available sampling rates 200 kHz down to 0 003 Hz using Chart 200 kHz down to 2 Hz using Scope 200 kHz to 1 Hz using Chart for Windows Sampling on USB rather than SCSI may limit the maximum sampling r...

Страница 57: ...cation Processor 16 MHz 68340 Memory 512 K RAM Data communication SCSI up to 4 megabytes s maximum dependent on computer USB up to 500 kilobytes s maximum dependent on setup Expansion Ports I2C expansion port Power and control bus for front end units Supports up to 16 front ends but limited to the PowerLab s free connectors Interface communications rate of up to 10 000 bits s Digital output 8 inde...

Страница 58: ... ends Replacement fuses 100 120 V 1 Amp 5 20 mm slow blow voltage rating 120 or 250 V 220 240 V 400 mA 5 20 mm slow blow voltage rating 250 V only Operating temperature range 0 to 35 C 0 to 90 humidity non condensing PowerLab 8SP Specifications Input Number of inputs 8 Input configuration Single ended Amplification ranges 2 mV to 10 V full scale in 12 steps 10 V 5 V 2 V 1 V 0 5 V 0 2 V 0 1 V 50 mV...

Страница 59: ...sampling rates 200 kHz on one channel 100 kHz on two channels 40 kHz on three or four channels 20 kHz on five to eight channels Available sampling rates 200 kHz down to 0 003 Hz using Chart 200 kHz down to 2 Hz using Scope 200 kHz to 1 Hz using Chart for Windows Sampling on USB rather than SCSI may limit the maximum sampling rates Output Amplifier Number of outputs 2 Output configuration Single en...

Страница 60: ...Hz 68340 Memory 512 K RAM Data communication SCSI up to 4 megabytes s maximum dependent on computer USB up to 500 kilobytes s maximum dependent on setup Expansion Ports I2C expansion port Power and control bus for front end units Supports up to 16 front ends but limited to the PowerLab s free connectors Interface communications rate of up to 10 000 bits s Digital output 8 independent lines TTL out...

Страница 61: ... ends Replacement fuses 100 120 V 1 Amp 5 20 mm slow blow voltage rating 120 or 250 V 220 240 V 400 mA 5 20 mm slow blow voltage rating 250 V only Operating temperature range 0 to 35 C 0 to 90 humidity non condensing PowerLab 16SP Specifications Input Number of inputs 16 Input configuration Single ended Amplification ranges 2 mV to 10 V full scale in 12 steps 10 V 5 V 2 V 1 V 0 5 V 0 2 V 0 1 V 50 ...

Страница 62: ...kHz on one channel 100 kHz on two channels 40 kHz on three or four channels 20 kHz on five to eight channels 10 kHz on nine to sixteen channels Available sampling rates 200 kHz down to 0 003 Hz using Chart 200 kHz down to 2 Hz using Scope 200 kHz to 1 Hz using Chart for Windows Sampling on USB rather than SCSI may limit the maximum sampling rates Output Amplifier Number of outputs 2 Output configu...

Страница 63: ... MHz 68340 Memory 512 K RAM Data communication SCSI up to 4 megabytes s maximum dependent on computer USB up to 500 kilobytes s maximum dependent on setup Expansion Ports I2C expansion port Power and control bus for front end units Supports up to 16 front ends but limited to the PowerLab s free connectors Interface communications rate of up to 10 000 bits s Digital output 8 independent lines TTL o...

Страница 64: ...nal power needs 25 VA no front ends attached Maximum power needs 35 VA full complement of front ends Replacement fuses 100 120 V 1 Amp 5 20 mm slow blow voltage rating 120 or 250 V 220 240 V 400 mA 5 20 mm slow blow voltage rating 250 V only Operating temperature range 0 to 35 C 0 to 90 humidity non condensing ADInstruments reserves the right to alter these specifications at any time ...

Страница 65: ...discrete steps analog input This refers to the connectors on the front of the PowerLab marked Input These inputs are designed to accept up to 10 volts Inputs can be either single sided or differential the latter only in the case of the Pod connectors analog output This refers to the connectors on the front of the PowerLab marked Output The analog output provides a software controlled variable outp...

Страница 66: ...A sort of cable or connector there are various sorts with different numbers of pins envelope form The overall shape of a signal outlined by the minimum and maximum recorded values Often used to display quickly changing signals excitation voltage The voltage supplied to a bridge circuit from which the transducer output signal is derived Manipulating the transducer changes the measurement elements o...

Страница 67: ...ter that passes low frequency signals and DC voltages but filters high ones by attenuating frequencies above a certain frequency called the cutoff or 3 dB frequency Macintosh A family of Apple computers with built in graphics and an elegant user interface Of the Mac OS operating system versions System 7 is needed and System 7 6 recommended normally a Power Macintosh and Mac OS 8 5 or later are nee...

Страница 68: ... a time over a single wire The PowerLab 800 has a slow serial connection for use with early Macintosh computers TChart A simplified version of the Chart program once used for teaching Its manual of experiments is now available for Chart terminator A device used in a SCSI chain to maintain signal integrity Some models of PowerLab have them built in transducer A physical device that converts a mecha...

Страница 69: ...h 23 24 Pod 7 8 37 38 portable computers 24 PowerBook 23 PowerLab to computer 17 26 safe to humans 5 7 31 safety v viii SCSI 20 26 36 USB 17 20 35 Windows 24 26 contacting ADInstruments ii cooling fan 13 D DAC digital to analog converter 30 DC drift 32 digital input 31 37 digital output 31 37 digital to analog converter 30 E equipotential connection 11 error patterns 16 17 external trigger 9 29 30...

Страница 70: ... v viii 5 7 31 Scope 4 5 SCSI cables 21 22 23 card 23 26 43 chain 22 connection 20 26 36 connection rules 20 20 22 ID number 21 22 multiple devices 24 25 port 10 35 problems 39 46 termination rules 23 SCSI ID switch 10 22 SCSIProbe 22 self test 16 17 Status indicator 7 23 storage vii T technical specifications PowerLab 16sp 53 56 PowerLab 4sp 47 50 PowerLab 8sp 50 53 termination rules for SCSI 23 ...

Страница 71: ...urposes for which it is suited and agree to take responsibility for their actions and the results of their actions If problems arise with an ADI product ADI will make all reasonable efforts to fix them This service may incur a charge depending on the nature of the problems and is subject to the other conditions in this Agreement Limitations ADI products are produced to high standards and should pe...

Страница 72: ...s altered Software License The Purchaser has the non exclusive right to use the supplied ADI software The Purchaser s employees or students for instance are entitled to use it provided they adhere to this Agreement The Purchaser can make as many backup copies of ADI software as is reasonable Each separate purchase of a software program however licenses it to be used on only one computer at any giv...

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