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8-1

8

Troubleshooting

If your DAC-02 board is not operating properly, use the information in
this chapter to isolate the problem. If the problem appears serious enough
to warrant technical support, refer to “Technical Support” on page 8-5 for
information on how to contact an applications engineer.

Problem Isolation

If you encounter a problem with a DAC-02 board, use the instructions in
this section to isolate the cause of the problem before calling Keithley
MetraByte Hardware Applications Engineering.

Identifying Symptoms and Possible Causes

Use the troubleshooting information in Table 8-1 to try to isolate the
problem. Table 8-1 lists general symptoms and possible solutions for
problems with DAC-02 boards.

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

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Содержание DAC-02

Страница 1: ...ess underutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demo...

Страница 2: ...DAC 02 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: ...DAC 02 User s Guide Revision B July 1994 Part Number 61740 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 6: ...Aurora Road Cleveland OH 44139 Technical Support 1 888 KEITHLEY Monday Friday 8 00 a m to 5 00 p m EST Fax 440 248 6168 Visit our website at http www keithley com Artisan Technology Group Quality Inst...

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: ...THE USE OF THIS PRODUCT THIS PRODUCT IS NOT DESIGNED WITH COMPONENTS OF A LEVEL OF RELIABILITY SUITABLE FOR USE IN LIFE SUPPORT OR CRITICAL APPLICATIONS Refer to your Keithley Instruments license agr...

Страница 10: ...rd 3 2 Installing the Board 3 5 4 Cabling and Wiring Attaching an STA U 4 2 Selecting Output Ranges 4 2 Using the 4 to 20 mA Current Loop Output 4 3 Using an AC Reference Digital Attenuator 4 5 5 The...

Страница 11: ...gure 4 4 4 to 20 mA Current Output Floating Load 4 4 Figure 4 5 4 to 20 mA Current Output Grounded Load 4 5 Figure 4 6 DAC 02 Equivalent Circuit when Using an AC Reference 4 5 Figure B 1 Main I O Conn...

Страница 12: ...iples and applications The DAC 02 User s Guide is organized as follows Chapter 1 describes features accessories and software options of the board Chapter 2 summarizes operating features of the board T...

Страница 13: ...perating problems This chapter also contains instructions for obtaining technical support Appendix A contains specifications for the DAC 02 board Appendix B contains pin assignments for the main I O c...

Страница 14: ...ories Features and Applications Features of the DAC 02 are as follows Two analog output channels 12 bit resolution 0 to 5 0 to 10 5 and 10 V output ranges 4 to 20 mA current loop sink capability Softw...

Страница 15: ...rol Panel is a means of testing the board and your application it is also a means of performing simple applications Refer to Chapter 5 for more information about the Control Panel PORTIO DLL A DLL Dyn...

Страница 16: ...rd Figure 2 1 shows a block diagram of the DAC 02 board Figure 2 1 Block Diagram of DAC 02 DAC 0 Bus Interface Address Decoder DAC 1 V Ref IBM PC Bus Base Address Select 1 Ref In Bipolar Output Unipol...

Страница 17: ...as follows 0 to 10 V 0 to 5 V 5 V 10 V 4 to 20 mA current loop sink Alternatively the DACs can operate as multiplying D A converters if they are used with a variable or AC reference As multiplying D A...

Страница 18: ...self by touching a grounded conductor such as your computer chassis your computer must be turned off or by wearing an anti static strap Whenever you handle a board hold it by the edges and avoid touch...

Страница 19: ...XT to familiarize yourself with the contents of the package Note that the Windows program CTL02W EXE the Control Panel is available for the operation of your DAC 02 If you plan to use the Control Pane...

Страница 20: ...your system use the program CFG02 EXE to determine the settings for a new address Table 3 1 lists the values for each position of the base address switch Table 3 1 Values of Base Address Switch Positi...

Страница 21: ...ce 000 0FF Internal I O 378 37F Printer 100 1FF Undecoded 380 389 Binary comm 2 200 20F Joy stick Port 380 38C SDLC comm 210 217 Expansion unit 390 39F Available 218 21F Available 3A0 3A9 Binary comm...

Страница 22: ...ched equipment 2 Remove the computer chassis cover 3 Select an unoccupied accessory slot and remove the corresponding blank plate from the I O connector panel 4 Insert and secure the board in the sele...

Страница 23: ...s for the Main I O Connector Note The 5 V power from the computer is supplied on pin 13 If you use this power avoid shorting or overloading the computer power supply 14 10 V Reference 15 5 V Reference...

Страница 24: ...or on the STA U The mating connector is a male DB25P solder cup type Keithley MetraByte part number SMC 25 Select the ranges according to the pin wiring in Table 4 1 Table 4 1 Pin Wiring for Output R...

Страница 25: ...Current Loop Output The 4 to 20 mA current loop output consists of a precision current sink formed by a VMOS power FET and a reverse protection diode as shown in Figure 4 3 10 V 0 1 20 to 22 14 to 16...

Страница 26: ...pply is ideal Figures 4 4 and 4 5 shows two ways of connecting the process loop The floating load way allows additional loops to be powered by the same supply but constrains the load to 2 wire floatin...

Страница 27: ...ce signal Figure 4 6 shows the equivalent circuit for the board when used in this mode Figure 4 6 DAC 02 Equivalent Circuit when Using an AC Reference RL DAC 02 LL GND Floating Supply 4 to 20 mA Unipo...

Страница 28: ...The first parameter is feedthrough the amount of residual signal at digital zero Feedthrough which is mainly a function of stray capacitance rises with frequency At 10 kHz feedthrough is typically 5 m...

Страница 29: ...base address and DAC output ranges select Config from the Control Panel menu 3 To set up and perform an analog output operation select Output from the Control Panel menu When the Control Panel display...

Страница 30: ...ed in the I O space Table 6 1 is a map of the DAC 02 register I O addresses Base addresses 4h to 7h are redundant they repeat the pattern of the first four addresses and can be ignored during programm...

Страница 31: ...d broadside to the DAC thus assuring a single step update This process is known as double buffering For 8 bit operation first write zero to the low byte then perform all further operations with the hi...

Страница 32: ...D 16 DH Derive remainder in low byte 20 DL 16 DL Shift low nibble four places 30 left Next write the data to the DAC The example uses DAC 0 with a base address of 300h 40 OUT H300 DL Low byte 50 OUT...

Страница 33: ...rating a DAC 02 board are as follows A digital voltmeter accurate to 6 1 2 digits such as a Keithley Instruments Model 199 An STA U accessory with K 1800 cable or a user designed interface Calibration...

Страница 34: ...m Isolation If you encounter a problem with a DAC 02 board use the instructions in this section to isolate the cause of the problem before calling Keithley MetraByte Hardware Applications Engineering...

Страница 35: ...e accessory slot Check the board for proper seating The board is damaged Contact the Keithley MetraByte Hardware Applications Engineering Department see page 8 5 Intermittent operation The most common...

Страница 36: ...f the DAC 02 board refer to page 3 3 for more information Check the I O assignments of other system resources and reconfigure if necessary Computer does not boot Board not seated properly Check the in...

Страница 37: ...the computer and perform any necessary diagnostics At this point if you have another DAC 02 board that you know is functional you can test the slot and I O connections using the instructions in the ne...

Страница 38: ...ter If you were using more than one board try each board one at a time in the computer to determine which is faulty 6 If you cannot isolate the problem refer to the next section for instructions on ob...

Страница 39: ...ideo system BIOS type ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ Operating System DOS version Windows v...

Страница 40: ...handling it with ground protection Ship the equipment to Attn RMA ___________ Repair Department Keithley Instruments Inc 28775 Aurora Road Cleveland OH 44139 Telephone 1 888 KEITHLEY FAX 440 248 6168...

Страница 41: ...B maximum Fixed reference ranges 0 to 5 V unipolar 0 to 10 V unipolar 5 V bipolar 10 V bipolar 4 to 20 mA current loop Variable reference ranges 10 V 2 or 4 quadrant Reference input resistance 7 k min...

Страница 42: ...range 0 to 70 C Storage temperature range 55 to 125 C Humidity 0 to 95 noncondensing Weight 4 oz 120 gm Table A 3 Power Specifications Feature Specification 5 V supply 75 mA typical 100 mA maximum 12...

Страница 43: ...O connector Figure B 1 Main I O Connector Pin Assignments 14 10 V Reference 15 5 V Reference 16 DAC 1 Reference Input 17 DAC 1 Bipolar Output 18 DAC 1 Unipolar Output 19 DAC 1 4 to 20 mA Output 20 10...

Страница 44: ...type D 1 2 Control Panel utility 1 2 5 1 D data format 6 2 diagram block 2 1 E equipment requirements 7 1 examples programming 6 3 F FILES TXT 3 2 I I O address map 6 1 I O commands 6 1 installing a D...

Страница 45: ...cifications DAC A 1 environmental A 2 power A 2 static electricity 3 1 STA U accessory 1 2 switch base address 3 3 switch and jumper locations 3 2 T Technical Support 8 5 troubleshooting 8 1 U unpacki...

Страница 46: ...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 47: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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