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2-11

Conversion Clock Sources (DAS-8/PGA(G2), DAS-8/AO, and
DAS-8/LT)

The conversion clock source determines when each analog-to-digital
(A/D) conversion is initiated. DAS-8/PGA(G2),DAS-8/AO, and
DAS-8/LT boards provide the following software-selectable conversion
clock sources:

•

Software

— When using a software conversion clock, the host

computer issues a command to initiate a conversion. The host polls
the board to determine if the conversion is complete. When the
conversion is complete, the host reads the data from the ADC and
returns the value. If the host reads data before the conversion is
complete, the data will be invalid.

Software-initiated conversions are suitable for measuring DC
voltages; however, in applications where you must accurately control
the sampling rate (as when measuring time-varying signals), it is
recommended that you use either an internal or an external hardware
conversion clock source.

At power-up or system reset, the board assumes that conversions will
be initiated through software.

•

Hardware (internal clock source)

— The input to the counter/timers

used for A/D timing varies. The DAS-8 uses the PC bus clock while
the DAS-8/PGA (G2), DAS-8/AO, and DAS-8/LT have an on-board 1
MHz crystal oscillator. The frequency of the PC bus may be
determined automatically as described above.

•

The internal clock source uses the on-board 82C54 counter/timer
circuitry and a crystal-controlled 1MHz time base. The 82C54
counter/timer circuitry is normally in an idle state. When you start an
analog input operation, a conversion is initiated immediately. The
82C54 is loaded with its initial count value and begins counting
down. When the 82C54 counts down to 0, another conversion is
initiated and the process repeats.

Because the 82C54 counter/timer uses a 1MHz time base, each count
represents 1

µ

s. For example, if you load a count of 25, the time

interval between conversions is 25

µ

s; if you load a count of 65536,

the time interval between conversions is 65.536ms.

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Содержание DAS-8 Series

Страница 1: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

Страница 2: ...DAS 8 Series User s Guide A G R E A T E R M E A S U R E O F C O N F I D E N C E Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 3: ...therefore Keithley does not warrant that operation of the Keithley Software will be uninterrupted or error free and or that the Keithley Software will be adequate for the customer s intended applicati...

Страница 4: ...CHINA Yuan Chen Xin Building Room 705 12Yumin Road Dewai Madian Beijing 100029 8610 6202 2886 Fax 8610 6202 2892 FINLAND Tiet j ntie 2 02130 Espoo Phone 09 54 75 08 10 Fax 09 25 10 51 00 FRANCE 3 all...

Страница 5: ...DAS 8 Series User s Guide Revision H June 2002 Part Number 66160 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 6: ...QUENTIAL DAMAGES RELATED TO THE USE OF THIS PRODUCT THIS PRODUCT IS NOT DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY THAT IS SUITED FOR USE IN LIFE SUPPORT OR CRITICAL APPLICATIONS All brand and...

Страница 7: ...ry II as described in the International Electrotechnical Commission IEC Standard IEC 60664 Most mea surement control and data I O signals are Installation Category I and must not be directly connected...

Страница 8: ...in the manual The symbol on an instrument shows that it can source or measure 1000 volts or more including the combined effect of normal and common mode voltages Use standard safety precautions to av...

Страница 9: ...boards including a description of supported software and accessories Section 2 provides a more detailed description of the analog input digital I O analog output and counter timer I O features of DAS...

Страница 10: ...boards using DriverLINX An index completes this manual Throughout the manual keep the following in mind References to DAS 8 Series boards apply to the DAS 8 DAS 8 LT DAS 8 PGA DAS 8 PGA G2 and DAS 8...

Страница 11: ...Sources DAS 8 PGA G2 DAS 8 AO and DAS 8 LT 2 11 Triggers 2 14 Hardware Gates 2 16 Data Transfer 2 18 DAS 8 AO Analog Output Features 2 18 Digital I O Features 2 19 82C54 Counter Timer Circuitry 2 20...

Страница 12: ...uencies 3 16 4 20mA Current Loops 3 17 The Reference DAS 8 and DAS 8 LT Only 3 17 Interface to Transducers Thermocouples etc 3 18 Application Precautions 3 20 Installing and Configuring DriverLINX for...

Страница 13: ...tiple Expansion Boards 4 8 Connecting Signals 4 9 Connecting an Analog Input Signal to a Single Ended Input 4 10 Connecting an Analog Input Signal to a Differential Input 4 11 Connecting Analog Output...

Страница 14: ...8 Connector Pin Assignments B 1 DriverLINX Implementation Notes C 1 Logical Channels C 3 Analog Input Subsystem C 3 Logical Channels C 3 Analog Input Initialization C 3 External Triggering C 4 Extern...

Страница 15: ...Digital I O Conversion Delay C 10 Digital I O Data Lost C 10 Counter Timer Subsystem C 11 Logical Channels C 11 Counter Timer Initialization C 12 Counter Timer Interrupt C 12 Event Counting C 12 Freq...

Страница 16: ...ows NT a compiler supporting Microsoft Windows development a mouse is highly recommended Each member of the DAS 8 Series has the same functions with the following differences DAS 8 LT for use in a lap...

Страница 17: ...crystal Two additional counters on the 82C54 are available for event counting pulse and waveform generation frequency period and pulse width measurements The 7 bits of TTL digital I O consist of one...

Страница 18: ...DriverLINX program that verifies the installation and configuration of DriverLINX to your DAS 8 Series board and demonstrates several virtual bench top instruments Learn DriverLINX an interactive lear...

Страница 19: ...s requirements with the available software packages and you are an experienced programmer you may be able to program your DAS 8 Series board through direct register I O instructions Contact the facto...

Страница 20: ...inals that allow you to access the functions of the board provides a breadboard area with power and additional screw terminals to access the user designed circuitry Requires a C1800 or S1800 cable STA...

Страница 21: ...uts C 1800 cable Unshielded 18 inch cable with a 37 pin connector on each end allows you to connect a DAS 8 Series board to an STA 08 STA 08PGA EXP 16 EXP 16 A or EXP GP S 1800 cable Shielded 18 inch...

Страница 22: ...alog input features Analog output features DAS 8 AO Digital I O features Counter timer I O features Interrupts Power Measuring Voltage A functional block diagram of a DAS 8 Series board is shown in Fi...

Страница 23: ...e dependent IBM PC AT Bus Interrupt Select Levels 2 7 Jumper Address Decode Bus Interface Bus Power for Expansion Interface 5V 12V 12V COM Status Registers Control Registers Interrupt Control I O Buff...

Страница 24: ...single ended input configuration is appropriate if you are measuring relatively high level signals greater than 1V if the source of the input signal is close to the board less than two feet or if all...

Страница 25: ...to obtain consistent noise free measurements because inadvertent ground loops are common when using single ended connections Use low level grounds for all analog signal returns to the DAS 8 and DAS 8...

Страница 26: ...ges Table 2 1 lists the gains supported by DAS 8 Series boards and the analog input voltage range for each gain Table 2 1 Supported Gains Board Gain Range Bipolar Unipolar DAS 8 DAS 8 LT 1 5V Not avai...

Страница 27: ...mple resistive dividers Each DAS 8 PGA G2 or DAS 8 AO input channel can be configured for either single ended or differential inputs by means of Switch S2 The DAS 8 PGA G2 has a built in differential...

Страница 28: ...that the start channel is 4 the stop channel is 7 and you want to acquire five samples Your program reads data first from channel 4 then from channels 5 6 and 7 and finally from channel 4 again Note A...

Страница 29: ...ains Automatic channel scanning is a hardware feature The functions used to create a group of channels sequential or non sequential or a channel gain list emulate automatic channel scanning through so...

Страница 30: ...be configured with a variety of different channel functions and gains single ended and differential Note The PG408 DC DC Converter option on the EXP 16 is required for use with the DAS AO board Figur...

Страница 31: ...the DAS 8 To measure the PC bus clock frequency DriverLINX requires that Counters 1 and 2 be chained together using an external jumper To chain the counters connect Counter 2 Out 6 to Counter 1 IN 4...

Страница 32: ...em reset the board assumes that conversions will be initiated through software Hardware internal clock source The input to the counter timers used for A D timing varies The DAS 8 uses the PC bus clock...

Страница 33: ...al clock source An external clock source is useful if you want to sample at rates not available with the 82C54 counter timer circuitry if you want to sample at uneven intervals or if you want to sampl...

Страница 34: ...by the number of channels The rate at which the computer can reliably read data from the board depends on a number of factors including your computer the operating system environment whether you are u...

Страница 35: ...following trigger sources to trigger an analog input operation Software When you start the analog input operation conversions begin immediately Hardware You connect a digital trigger signal to the di...

Страница 36: ...ent occurs Conversions begin when using an external clock source Conversions begin when using an internal clock source External Clock Source Internal Clock Source idle state count count count count Ar...

Страница 37: ...oard waits until the gate signal goes high before conversions begin When using the hardware gate the way conversions are synchronized depends on whether you are using a hardware external clock or a ha...

Страница 38: ...F Configuration and Implementation Notes Keithley DAS 8 manual for more information Software starts the operation 1st conversion external clock Internal Clock Source 1st conversion internal clock 2nd...

Страница 39: ...about interrupts If data is transferred in the foreground interrupts are not required DAS 8 AO Analog Output Features The DAS 8 AO is essentially a DAS 8 PGA with two DAC Digital to Analog Converter c...

Страница 40: ...al input line the input appears high logic 1 You can use the digital input and output lines for any general purpose task with the following exceptions If you are using an expansion board for an analog...

Страница 41: ...he gates appear enabled if no signal is attached to the gate inputs You can use the output pins OUT0 OUT1 and OUT2 for pulse or frequency outputs You can program the 82C54 counter timer circuitry to o...

Страница 42: ...the output goes high and remains high until the clock pulse after the next trigger this makes the one shot pulse retriggerable You do not have to reload the count into the counter The gate input has...

Страница 43: ...nt value and the process repeats A high gate input enables counting a low gate input disables counting If the gate goes low during an output pulse the output is set high immediately this allows you to...

Страница 44: ...s high again and the process repeats If the initial count is odd the output is high for n 1 2 counts and low for n 1 2 counts where n indicates the loaded count A high gate input enables counting a lo...

Страница 45: ...se and then goes high again Note that the output does not go low until n 1 clock pulses after the initial count is written where n indicates the loaded count A high gate input enables counting a low g...

Страница 46: ...high again Note that the output does not go low until n 1 clock pulses after the trigger event occurs where n indicates the loaded count After the trigger event occurs the gate input has no effect on...

Страница 47: ...ou are using an external interrupt you cannot use the INT_IN XCLK pin pin 24 to connect a hardware external clock source End of Conversion EOC interrupt An interrupt is generated when an A D conversio...

Страница 48: ...ough both hardware and software the board generates an interrupt to the host driving the selected host interrupt line to an active state Power The analog circuitry on the DAS 8 board is powered by the...

Страница 49: ...xternal power to EXP 16 EXP 16 A and EXP GP expansion boards Refer to the MB Series User s Guide for information on providing external power to MB Series backplanes Table 2 3 Expansion Board Backplane...

Страница 50: ...instructions in this chapter to configure the DAS 8 Series board See Installing the Board on page 3 25 2 Install DriverLINX Follow the instructions given by the installation program The Read Me First...

Страница 51: ...ly remove the board from its anti static wrapping material Store the wrapping material for future use 4 Inspect the board for signs of damage If any damage is apparent arrange to return the board to t...

Страница 52: ...iguring a DAS 8 PGA G2 board Figure 3 4 for configuring a DAS 8 AO board If you need additional information refer to Configuring the Board on page 3 7 Figure 3 1 DAS 8 Board 2 3 4 5 6 7 X IRQ LEVEL 1...

Страница 53: ...n Figure 3 2 DAS 8 LT Board 2 3 4 5 6 7 X IRQ LEVEL 9 8 7 6 5 4 3 O N BASE ADDRESS Switch block S1 J2 EXT INT R3 R4 1 2 3 4 5 6 7 J3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88...

Страница 54: ...0001 008H 0000010 010H 1100000 300H 1111111 3F8H 1 2 3 4 5 6 7 O N Switch block S1 8 Input Configuration On single ended Off differential Switch 1 Channel 0 Switch 2 Channel 1 Switch 3 Channel 2 Switc...

Страница 55: ...SS 2 3 4 5 6 7 X 1 2 3 4 5 6 7 O N Switch block S2 NORM SIM S5 OFF WAIT STATE ON J3 I I V V J6 CH0 J7 CH1 1 2 3 S3 1 2 3 S4 Switch block S1 1 2 3 4 5 6 7 O N 8 TP1 TP2 AMP OUT AMP REF Artisan Technolo...

Страница 56: ...t configuration single ended or differential for each channel on a DAS 8 PGA G2 or DAS 8 AO board Interrupt level DAS 8 AO configuration settings Analog output voltage current range Output channels da...

Страница 57: ...he base address switch 7 corresponds to the LSB of the base address The location of the base address switch block on the DAS 8 board is shown in Figure 3 1 the location of the base address switch bloc...

Страница 58: ...T 060H to 064H 8742 controller AT 060H to 06FH 8042 keyboard controller 070H to 071H CMOS RAM and NMI mask register AT 080H to 08FH DMA page registers 0A0H to 0A1H 8259 PIC 2 AT 0A0H to 0AFH NMI mask...

Страница 59: ...H Parallel printer 380H to 38FH SDLC 3A0H to 3AFH SDLC 3B0H to 3BBH MDA 3BCH to 3BFH Parallel printer 3C0H to 3CFH VGA EGA 3D0H to 3DFH CGA 3E8H to 3EFH Serial port 3F0H to 3F7H Floppy disk controller...

Страница 60: ...nded or differential signal connections depending on the model of your DAS 8 series board DriverLINX maps these signals to Logical Channels DriverLINX uses several of these control connections for ext...

Страница 61: ...of the input configuration switch block on the DAS 8 PGA G2 board is shown in Figure 3 3 and for the DAS 8 AO is shown in Figure 3 4 You place a switch in the ON position single ended by sliding the s...

Страница 62: ...ndix F Configuration and Implementation Notes for Keithley DAS 8 manual If you intend to acquire data in the background you must enable interrupts by setting an interrupt level Jumper block J2 contain...

Страница 63: ...Analog Output Voltage Range Adjustments DAS 8 AO Only Switches S3 and S4 are the Analog Output Range switches for D A1 and D A0 respectively Jumpers J6 and J7 set the D A outputs into either Voltage O...

Страница 64: ...0 to 10 volts 2 5 to 2 5 volts 4 to 20 mA S4 S3 I V J7 CH0 1 2 3 I V J6 CH1 1 2 3 I V J7 CH0 1 2 3 I V J6 CH1 1 2 3 I V J7 CH0 1 2 3 I V J6 CH1 1 2 3 I V J7 CH0 1 2 3 I V J6 CH1 1 2 3 I V J7 CH0 1 2 3...

Страница 65: ...ter timers used for A D timing varies The DAS 8 uses the PC bus clock while the DAS8 PGA and DAS 8 AO have an on board 1MHz crystal oscillator The frequency of the PC bus may be determined automatical...

Страница 66: ...t box and typing a new value for the selected digits 4 20mA Current Loops Process control current loop transducers interface easily with DAS 8 and DAS 8 LT by adding a suitable shunt resistor across t...

Страница 67: ...se devices can be powered from the 12V available from the computer and directly interfaced to DAS 8 Series boards For measuring high temperatures up to 1800 C or more thermocouples are the most satisf...

Страница 68: ...p 25 slope where Vx is the input voltage and Vcorr is the corrected voltage both in millivolts CJCTemp is the measured temperature in C of the cold junction and slope and offset are data in the lookup...

Страница 69: ...onnector DAS 8 Series boards implement the L L GND only when in the single ended input mode Digital common is the noisy or dirty ground that is meant to carry all digital signal and heavy current powe...

Страница 70: ...tion libraries for writing application programs such as Microsoft Visual C Microsoft Visual Basic Borland Delphi utility programs and language specific example programs DriverLINX the high performance...

Страница 71: ...efore Installing DriverLINX 1 Inventory your DAS 8 board s configuration settings 2 Determine the resources your DAS 8 Series board requires 3 Inventory your computer s resources already allocated to...

Страница 72: ...hat require DriverLINX Install Interfaces This optional component installs the files and example programs that you will need to develop custom applications for DriverLINX using C C Visual Basic Delphi...

Страница 73: ...item was selected previously 4 Select Read Me First and follow the instructions 5 Select Install Documentation If you do not have Adobe Acrobat installed on your computer install it by selecting Inst...

Страница 74: ...and switch settings match the settings you configure in DriverLINX Caution Installing or removing a board with the power ON can cause damage to your computer To install the board perform the following...

Страница 75: ...Refer to the documentation provided with your computer for more information on installing boards Configuring DriverLINX After you have successfully installed the DAS 8 Series board in your computer s...

Страница 76: ...tion Dialog Box 7 From the Model list select the model name for the DAS 8 Series board you are configuring 8 If the value displayed in the Address edit box is not correct type the correct value into t...

Страница 77: ...LINX and string is the value for that field The case of the letters in keyname and string is not significant A typical entry for logical device 0 in the configuration initialization file follows The s...

Страница 78: ...oltages at unity gain must be specified For the DAS 8 the minimum and maximum voltages are fixed at 5 volts If hardware interrupts are not supported select an IRQ value of 1 otherwise an interrupt req...

Страница 79: ...crew terminal connector STA 08 or STA 08PGA screw terminal accessory or EXP 16 EXP 16 A or EXP GP expansion board to a DAS 8 Series board through the main I O connector a 37 pin D type connector that...

Страница 80: ...DIG COM Pin 27 IP3 Pin 26 IP2 Pin 25 IP1 Pin 24 INT_IN Pin 23 GATE2 Pin 22 GATE1 Pin 21 GATE0 Pin 20 12V Top of Board Rear View IN0 Pin 19 IN1 Pin 18 IN2 Pin 17 IN3 Pin 16 IN4 Pin 15 IN5 Pin 14 IN6 P...

Страница 81: ...labeled from 1 to 37 and correspond directly to the functions of the pins on the main I O connector on the board For example since pin 24 is assigned to the external clock source use screw terminal 2...

Страница 82: ...ector on the DAS 8 Series board Figure 4 4 illustrates the connection of an STC 37 to a DAS 8 Series board Figure 4 4 Attaching an STC 37 Screw Terminal Connector 16 17 21 1 4 5 22 33 34 37 Pin 1 DAS...

Страница 83: ...o the functions of the pins on the main I O connector on the board To connect an STA 08 STA 08PGA to a DAS 8 Series board attach one end of the S 1800 or C 1800 cable to the main I O connector on the...

Страница 84: ...S 8 Series board attach one end of the S 1800 or C 1800 cable to the main I O connector on the DAS 8 Series board and the other end of the cable to the J1 connector on the EXP 16 or EXP 16 A Figure 4...

Страница 85: ...EXP GP to a DAS 8 Series board attach one end of the S 1800 or C 1800 cable to the main I O connector on the DAS 8 Series board and the other end of the cable to the J1 connector on the EXP GP Figure...

Страница 86: ...an S 1800 or C 1800 cable to the J2 connector on the previous expansion board and the other end of the cable to the J1 connector on the next expansion board in the chain Note Each EXP 16 EXP 16 A or E...

Страница 87: ...rd Although the illustrations in this section show a direct connection to a pin on the main I O connector you will actually wire your signal to a screw terminal on an accessory or expansion board or t...

Страница 88: ...el as a low level analog common When wiring analog input signals it is recommended that you terminate all unused input channels to low level ground this prevents the internal amplifier circuitry from...

Страница 89: ...r output resistances both less than and greater than 100 Since analog input channel 7 is not used the bias current return path is connected to the negative side of channel 7 Figure 4 10 Differential I...

Страница 90: ...illustrates how to connect a voltage output signal from a DAS 8 AO board to your application Figure 4 12 illustrates how to connect a current output signal from a DAS 8 AO board to your application Fi...

Страница 91: ...on the main I O connector Hardware digital trigger or hardware gate Connect a hardware digital trigger or hardware gate signal to the IP1 pin pin 25 on the main I O connector External interrupt Conne...

Страница 92: ...can use the output of the OUT1 pin pin 5 on a DAS 8 PGA G2 or DAS 8 AO board acting as a timing master to synchronize conversions on additional DAS 8 Series boards Figure 4 13 illustrates how you can...

Страница 93: ...er Board 1 Board 2 Board 3 Pin 24 INT_IN Pin 24 INT_IN Pin 24 INT_IN External clock Board 1 Board 2 Board 3 Pin 24 INT_IN Pin 24 INT_IN Pin 24 INT_IN DAS 8 PGA G2 Internal clock Pin 5 OUT1 Board 0 Mas...

Страница 94: ...efficient metal film or wirewound construction for stability with time and temperature Using this interface the 4 20mA working range of the current loop corresponds to 1638 bits of input a resolution...

Страница 95: ...the selected gain The following sections provide the information you need to calibrate DAS 8 Series boards Equipment Required You need the following equipment to calibrate a DAS 8 Series board A digi...

Страница 96: ...G2 boards contain four potentiometers R1 offset R2 full scale R3 unipolar fullscale and R4 unipolar offset see Figure 5 3 The DAS 8 AO boards contain ten potentiometers R1 offset R2 full scale R3 uni...

Страница 97: ...4 5 6 7 X IRQ LEVEL 1 2 3 4 5 6 7 O N BASE ADDRESS Switch block S1 J2 R1 R2 R3 Full scale R4 Offset 2 3 4 5 6 7 X IRQ LEVEL 9 8 7 6 5 4 3 O N BASE ADDRESS Switch block S1 J2 EXT INT R3 R4 1 2 3 4 5 6...

Страница 98: ...lock S2 1 2 3 4 5 6 7 O N 8 J2 R1 R2 R3 R4 IRQ LEVEL J2 BASE ADDRESS 2 3 4 5 6 7 X 1 2 3 4 5 6 7 O N Switch block S2 NORM SIM S5 OFF WAIT STATE ON J3 I I V V J6 CH0 J7 CH1 1 2 3 S3 1 2 3 S4 Switch blo...

Страница 99: ...any problems or unexpected responses it reports an error message to help isolate the problem The device initialization error messages fall into three basic categories Device not found Board address do...

Страница 100: ...uter is operating properly remove computer power again and install a DAS 8 Series board that you know is functional Do not make any I O connections 6 Apply computer power and check operation with the...

Страница 101: ...nterrupt level specified in the configuration file matches the setting of jumper J1 on the board Make sure that no other system resource is using the specified interrupt level Reconfigure the interrup...

Страница 102: ...a Differential Input on page 4 11 for more information Make sure that excessive common mode voltages are not present Another system resource is using one of the eight memory locations starting at the...

Страница 103: ...8 board Model configuration Serial Number Revision Code Base address setting Interrupt level setting Number of channels Input S E or Diff Mode uni or bip 8254 C T2 usage Cascade or Normal Number of EX...

Страница 104: ...outside of the package Repackage the equipment using the original anti static wrapping if possible and handle it with ground protection Ship the equipment to ATTN RMA _______ Repair Department Keithle...

Страница 105: ...le 5 Volt Coding Offset binary Overvoltage Continuous single channel to 35V Input current 100nA max at 25 C Gain Tempco Gain or F S 25ppm C max A D Specification Type Successive approximation Resoluti...

Страница 106: ...t 0 8V max low voltage IP1 3 input 0 4 max low current IP1 3 input 2 0V min high voltage IP1 3 input 20 A max 2 7V high current Interrupt Inputs Type Positive rising edge triggered Level 2 7 jumper se...

Страница 107: ...n 10MHz max Active count edge Negative falling Clock pulse width 50ns high 50ns low min Power Outputs IBM PC Bus Supplies 5Vdc and 12Vdc Tolerance 5Vdc and 12Vdc 5 12Vdc 10 Loading Dependent upon peri...

Страница 108: ...olution 12 bit Accuracy 0 01 of reading bit Full Scale Range 9 different gains of Coding Offset binary Bipolar True binary Unipolar Gain Tempco ppm C max Zero Drift 10ppm C max Sample Hold Amplifier A...

Страница 109: ...rrent 250nA max Linearity 1 bit Gain drift 35ppm of FSR C Zero drift 20ppm of FSR C Noise 30 V P P typical Acquisition time Gain 1 30 s Gain 500 95 s Conversion time 35 s Table A 2 DAS 8 AO Input Rang...

Страница 110: ...djustable to zero Offset drift Bipolar 4ppm C Unipolar 10ppm C Gain drift 30ppm of FSR C 4 20 mA Current Loop Type 4 20mA constant current sink to ground Output resistance 100MOhm Min loop excitation...

Страница 111: ...this flip flop Service routines should acknowledge and re enable the interrupt flip flop Programmable Timer Type 82C54 programmable interval timer Counters 3 down counter 16 bit Output drive 2 2mA at...

Страница 112: ...nt 400pA max at 25 C Gain Tempco Gain or F S 25 ppm C max Zero 15 V C max Settling time 4 5 s to 0 01 typ for F S step input of 10V A D Specification Type Successive approximation Resolution 12 bit Co...

Страница 113: ...pe Positive rising edge triggered Level 2 7 jumper selectable Enable Via INT of CONTROL Register Note Interrupts are latched in an internal flip flop on the DAS 8 The state of this flip flop correspon...

Страница 114: ...unt edge Negative falling Clock pulse width 50ns high 50ns low min Internal Oscillator Frequency 1 000MHz Symmetry 40 to 60 Power Outputs IPM PC Bus supplies 5Vdc 12Vdc 12Vdc 5mA max Loading Dependent...

Страница 115: ...a more detailed description of the pins Figure B 1 Main I O Connector DAS 8 LT VREF Pin 19 LLGND Pin 18 LLGND Pin 17 LLGND Pin 16 LLGND Pin 15 LLGND Pin 14 LLGND Pin 13 LLGND Pin 12 DIG COMPin 11 OP4...

Страница 116: ...computer frame 12 LL GND Low level grounds These are common returns and shields for the analog input channels 13 LL GND 14 LL GND 15 LL GND 16 LL GND 17 LL GND 18 LL GND 19 VREF 10V 0 1V reference ou...

Страница 117: ...tion IN0 Pin 19 IN1 Pin 18 IN2 Pin 17 IN3 Pin 16 IN4 Pin 15 IN5 Pin 14 IN6 Pin 13 IN7 Pin 12 DIG COMPin 11 OP4 Pin 10 OP3 Pin 9 OP2 Pin 8 OP1 Pin 7 OUT2 Pin 6 OUT1 Pin 5 CLK1 Pin 4 OUT0 Pin 3 CLK0 Pin...

Страница 118: ...Analog input channel 6 14 IN5 Analog input channel 5 15 IN4 Analog input channel 4 16 IN3 Analog input channel 3 17 IN2 Analog input channel 2 18 IN1 Analog input channel 1 19 IN0 Analog input channel...

Страница 119: ...0 Pin 19 IN1 Pin 18 IN2 Pin 17 IN3 Pin 16 IN4 Pin 15 IN5 Pin 14 IN6 Pin 13 IN7 Pin 12 DIG COM Pin 11 OP4 Pin 10 OP3 Pin 9 OP2 Pin 8 OP1 Pin 7 OUT2 Pin 6 OUT1 Pin 5 CLK1 Pin 4 OUT0 Pin 3 CLK0 Pin 2 DAC...

Страница 120: ...Analog input channel 6 14 IN5 Analog input channel 5 15 IN4 Analog input channel 4 16 IN3 Analog input channel 3 17 IN2 Analog input channel 2 18 IN1 Analog input channel 1 19 IN0 Analog input channel...

Страница 121: ...4 IN3 Analog input channel 3 35 IN2 Analog input channel 2 36 IN1 Analog input channel 1 37 IN0 Analog input channel 0 Table B 3 Main I O Connector Pin Assignments for the DAS 8 AO cont Pin Name Funct...

Страница 122: ...following table summarizes allowed data acquisition modes supported by each subsystem of DriverLINX The following table summarizes the operations and events implemented for each of the supported mode...

Страница 123: ...an analog input signal or pace start or stop a task Table C 2 Modes Operations and Events Subsystem Mode Operation Events Timing Start Stop Analog Input Polled Start rate dig cmd ana dig TC ana dig In...

Страница 124: ...nfiguration The inputs are labeled CH0 HI IN 37 CH0 LO IN 10 etc and are located on the D type male connector that projects through the rear panel of the computer Logical Channels Analog Input Logical...

Страница 125: ...igger are usually ignored The DAS 8 hardware does not support external triggering as defined above However you can obtain almost the same results using one of two techniques A hardware trigger can be...

Страница 126: ...coding for bipolar inputs and straight binary for unipolar inputs For all ranges and configurations the minimum value reported is 0 and the maximum value is 4095 A D data can be returned in native or...

Страница 127: ...and the frequency of the timing clock For Logical Counter 2 the longest delay between samples is 65 535 times the clock frequency For Logical counters 3 and 4 the longest delay is 4 294 967 295 times...

Страница 128: ...king the smallest conversion delay required Use the time measurement cursors on the Digital Storage Oscilloscope in the LearnDriverLINX facility in the DriverLINX program to measure the period of the...

Страница 129: ...by the Analog Output Range switches S3 and S4 For example if you use the 0 5V range the D A output range will be as follows If you output larger or smaller values the high order bits will be ignored...

Страница 130: ...more information and run empirical tests to determine suitability of D A output for the intended purpose The D A conversion delay to output a periodic waveform with a given number of samples per perio...

Страница 131: ...rvice Request All digital I O is right justified Unused bits are ignored on output and are returned as zero on input Digital Input Initialization Initialization of the DriverLINX Digital Input subsyst...

Страница 132: ...ock for a data acquisition task The timing interval generated by Counter 2 can vary from 2 to 65 535 clock tics If a longer timing interval is needed for an application Logical Channels 3 or 4 can be...

Страница 133: ...cation program reads the accumulated count as it deems appropriate As the DAS 8 allows an external clock input only for Counters 0 and 1 DriverLINX supports event counting only for Logical Counters 0...

Страница 134: ...nput frequency and the gate time As the input frequency decreases the gate time must increase to preserve accuracy It is the responsibility of the application program to choose the gate time To measur...

Страница 135: ...ne In polled mode DriverLINX does not return control to the calling application until the frequency measurement is completed The measured frequency in clock tics counted during the gating period is re...

Страница 136: ...iverLINX API The pulse output is inverted active low the Intel 8254 cannot generate a single active high pulse A warning message about inverted pulse levels is always returned by DriverLINX when using...

Страница 137: ...tem 3 11 Analog Input Initialization DriverLINX configuration of DAS8 C3 Analog Input Subsystem DriverLINX configuration for DAS8 C3 Analog output DAS8 AO 4 12 Analog Output Initialization configurati...

Страница 138: ...7 Common 4 9 Commonly used interrupt levels 3 14 Commonly used I O addresses 3 9 Common mode voltages 2 6 Configuration hardware DAS 8 3 3 3 4 hardware DAS 8 PGA G2 3 5 3 6 options 3 7 Configuration...

Страница 139: ...5 3 6 DAS8LT reference voltage 4 16 Data Coding DriverLINX configuration of DAS8 C5 Data transfer techniques specifying 3 13 Default settings see Power up settings Delphi function libraries for writin...

Страница 140: ...iverLINX 3 11 Expansion board configuration DriverLINX dialog for expansion channels 2 7 Expansion boards 2 8 attaching 4 1 daisy chaining 4 8 EXP 16 and EXP 16 A 1 5 EXP GP 1 5 powering 2 27 EXP GP e...

Страница 141: ...etting for data transfer modes 3 13 Interrupt levels 3 13 commonly used 3 14 Interrupts 2 18 2 26 I O addresses commonly used 3 9 J Jumper 3 13 L LabVIEW function libraries for writing application pro...

Страница 142: ...ator mode 2 22 Reference voltage DAS8 LT 4 16 Resolution 2 2 S S 1800 cable 1 6 4 3 Screw terminal accessories 2 9 4 8 attaching 4 1 STA 08 1 5 STA 08PGA 1 5 STC 37 1 5 Setting base address 3 8 input...

Страница 143: ...al programming 2 17 Triggers 2 14 Troubleshooting 6 1 Turbo Pascal function libraries for writing application programs in 1 3 U Unipolar input range type 2 5 Unpacking the board 3 2 Utility programs c...

Страница 144: ...4 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 7500 Fax 0118 929 7519 INDIA Flat 2B Willocrissa 14 Rest House Crescent Bangalore 560 001 91 80 509 1320 21...

Страница 145: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

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