Keithley ADC-16 User manual

ADC-16
Analog Input Board
User Guide

User Guide
for the
ADC-16
Analog Input
Board
Rev'sion B - December !992
Copyright Keithley Data Acquisition 1992
Part Number: 24446
KEITHLEY DATA ACQUISITION - KeithleyMetraByte/Asyst
440 Myles Standish Blvd., Taunton, MA 02780
TEL. [phone], FAX [phone]
...
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Warranty Information
All products manufactured by Keithley Data Acquisitionarewarranted
against defectivematerials and workmanship for a period of one year
fromthe date of delivery to the original purchaser. Any product that
is
found to be defectivewithin the warranty period will, at the option of
the manufacturer,
be repaired or replaced. Thiswarranty does not apply
to products damaged by improper use.
Warning
Keithley Data Acquisition assumes
no liability for damages
consequent
to 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.
Disclaimer
Information furnished by Keithley Data Acquisitionisbelieved to be
accurateand reliable. However, Keithley Data Acquisitionassumes no
responsibilityfor the use of suchinformation nor for any infringements
of patents or other rights of third parties that may result from its use.
No
licenseis granted by implication or otherwise under any patent rights of
KeithleyData Acquisition.
Copyright
All rights reserved.
No part of this publication may be reproduced,
stored in a retrieval system,or transmitted in any form by any means,
electronic,mechanical,photo-reproductive, recording, or otherwise
without the expressprior written permission
of the Keithley Data
Acquisition.
Note:
Keithley MetraBytemis a trademark of KeithleyInstruments.
Basic* is a trademark of Dartmouth College.
IBM@
is a registered trademark of International BusinessMachines
Corporation.
PC, XT, AT, PW2, and Micro ChannelArchitecture@aretrademarks of
International Business MachinesCorporation.
Microsoft@is a registered trademark of MicrosoftCorporation.
Turbo
C@ is a registered trademark of Borland International.
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Contents
CHAPTER 1 . INTRODUCTION
1.1 FunctionalOverview .................................. 1.1
1.2 Software Overview
................................... 1.2
1.3 Accessories ...................................... . 1-3
1.4 Specifications ...................................... 1.4
CHAPTER 2 . INSPECTION. CONFIGURATION. & INSTALLATION
2.1 Inspection ........................................ 2.1
2.2 Configuration
...................................... 2.1
2.3 The Main I/O ConnectorJ1 ............................... 2.3
2.4 Software Installation
.................................. 2.3
2.5 The ConfigurationProgram
............................... 2.4
2.6 Hardware Installation .................................. 2.5
CHAPTER 3 . OPERATING & PROGRAMMINGOVERVIEW
3.1 General ......................................... 3.1
3.2 The Pop-up Control Panel
............................... 3.1
. 3.3 The Call Driver ..................................... 3.1
3.4 Low-Level-Register
I/O Programming ......................... 3.1
CHAPTER 4 . THE POP-UP CONTROL PANEL
4.1 Overview ........................................ 4.1
4.2 Driver Descriptions ................................... 4.1
4.3 Driver-FileLoading/UnloadingOptions
........................ 4-1
4.4 Syntax Conventions
.................................. 4.3
4.5 VLEXE: Loading
& Unloading ............................. 4.4
4.6 PADCl6.EXE: Loading
& Unloading ......................... 4.6
4.6 LoadingANSLSYS ................................... 4.8
CHAPTER 5 . POP-UPCONTROL PANEL OPERATION
5.1 Preliminary Requirements ............................... 5.1
5.2 Getting Started ..................................... 5.1
5.3 ImportantHot Key Combinations ............................ 5.1
5.4 The Control Panel
.................................... 5.2
5.5
The Data Logging Panel ................................ 5.3
CHAPTER 6 . THE CALL INTERFACE
6.1 General ......................................... 6.1
6.3 QuickBASIC4.0+, IncludingProfessionalBASIC
7.0+ ................ 6-7
6.5 List Of Calls
...................................... 6-20
6.6 Glossary Of CallTerms
................................ 6-22
6.2 GW BASIC, BASICA.
& BASIC ............................ 6.1
6.4 QBASlC ......................................... 6-13
CHAPTER 7 . INDIVIDUALCALL DESCRIPTIONS
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Contents
CHAPTER 8 . REGISTER-LEVEL I/O MAPS
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
Introductory Information ................................ 8-1
I/O RegisterAddress Map ............................... 8-1
AID Registers(Base Address +O & +1) ........................ 8-1
MUX & Gain Register(Base Address +2)
...................... 8-2
Control Register(BaseAddress +3)
......................... 8-3
Status Register(Base Address +3) .......................... 8-4
Typical Programming Sequence ........................... 8-4
BASIC Example Program ............................... 8-5
CHAPTER 9 . CALIBRATION
9.1 CalibrationInterval ................................... 9-1
9.2
CalibrationProgram .................................. 9-1
9.3
RequiredTest Equipment ............................... 9-1
CHAPTER 10 . FACTORY RETURNS
APPENDIX
Appendix A . Summary Of Error Codes
...
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CHAPTER 1
INTRODUCTION
1.1 FUNCTIONAL OVERVIEW
General
TheAX-16is a low-cost, high-resolution(16bit),analog input board for ISA and EISA bus
computers(IBMPC/XT/AT orcompatible). An integrating
A/D converter performs up to 16
conversions/sec whileensuring repeatabilityin noisyenvironments. Eight differentialinput channels
offer 16-bitresolution
(15 bit + sign). Figure 1-1 isa block diagram of the ADC-16.
1 mA
SOURCE
O--
-
Vref r,
(+5 V)
MUX
CHO HI
CHO
LO
CHI HI
CH1
LO
CH2 HI
CH2
LO
CH3 HI
CH3 LO
CH4 HI
CH4 LO
CH5 HI
CH5
LO
CH6 HI
CH6
LO
CH7 HI
CH7
LO
L.L. GND
L.L. GND
L.L. GND
GAINS
1, 10. 100 I
SCALING
fi - i 3.2767
I
.,
17 0
CONTROL/SiATUS
MUX & GAIN
& INTERRUPT
SELECT REGISTER CONTROL REGISTER
I I
INTERNAL DATA aus
COMMON
N.3.
N.C.
COMMOlv
N.O.
N.C
OPD
C=:
EX1
EX2
EX4
IPO
IP 1
+5 V OUT
POWER COU
POWER COM
IUI
IBM PC BUS
Figure 1-1. Block diagram of the ADC-16.
Gainsof 1,10, and 100 are software-programmable. A singlegain adjustment sets the full scaleof
every range.
No additionaladjustments are required sincethe zero of every range is automatically
corrected.
Additional featuresinclude two
TTL compatible,general-purpose digital outputs and two general-
purpose TTL/CMOScompatible digital inputs. Thedigital outputs
also drive two internal Form C
relays on the ADC-16. These relays
are availableforswitchingand expansion applications.
1-1

ADC-16 USER GUIDE
Three more digital outputs become availablewhen the optional STA-EX8expansion multiplexer(s) is
not used. A 1 mA, high-precision current source with a complianceof -10 V to +4 V allows excitation
of resistance-based transducers such as RTDs.
All connectionsto the ADC-16 pass through a standard
37-pin D connectorusing the manufacturer's C-1800cable.
Optional equipment for the ADC-16 includes two screw-termination boxes: the STA-U and the STA-
EX8. TheSTA-U provides access to all ADC-16 interfacesignals via miniature screw-terminal
connectors. TheSTA-EX8 provides access to all ADC-16 interface signals via miniature screw-
terminal connectors,and it provides eight additionalinput channels. Up to eight STA-EX8smay be
added
to an ADC-16, resulting in 64 fully differentialchannels.
Operating Modes
A/D Transfers
TheADC-16 conducts A/D conversionson a self-timingbasis; the conversions progress as quickly as
the A/D circuitrycan operate. When a previous conversionends, the Driver starts another.
This
process continues until the scan is complete.
When a STart/Stop arrayis in use, the number of conversionsis equal to the number of channels
specified in the array. Thisnumber can be upto
64 if eight STA-EX8sare in the system.
When a Channel/Gain array is in use, the number of conversions is equal to the number of entries in
the array.
This number can be upto 256.
There are three modes of A/D operations:
SYNCHRONOUSMODE - where the transfers are occur in the foreground, forcingthe user to
wait for the board to finish. This mode is invoked by the K-Syncstart call
( seeChapters 6 and 7).
INTERRUPTMODE- where the transfers occur in the background, allowing the user to execute
codeuntil the board finishes. This mode is invoked by the K-IntStart call and tested for
completionby the K-IntStatus call (seeChapters6and
7).
These two modes require that channel and gain information be set into Frames using the K-SetBuf
and K-SetChanGary or K-SetStartStopG calls. For more information on Frames, refer to Section
6.6.
IMMEDIATEMODE - where when a singleA/D operation takes place, all information is passed
via the Callparameters rather than by Frames, asin the two previous modes.
Digital Operations
Digital Input and Output operate only in the Immediate Mode, asdescribed above for Immediate
Mode
1.2 SOFTWARE OVERVIEW
Thismanual refers to the ADC-16 softwareas the Distribution Software. The Distribution Software
containsa softwareinstallation program, driver files,utility files, calibration files,and programming
examplefiles. For a list
of these files, with descriptions, refer to the ASCII file FILES.DOC.
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CHAPTER 1 : INTRODUCTION
Becausethe Distribution Softwarearrives in compressed form, it is important that you follow the
installation instructions in Section
2.4. You must use the installation program to uncompress these
filesbeforeyou can accessFILES.DOC.
The driver software supportsthe
Pop-up Control Panel and the Cull Driver, which aretwo of the three
interface options availablefor controlling the ADC-16. The third control interfaceis
Register-Level I/O
programming. Chapter3describes of each of these interfaces.
Additional programming optionsareavailable in the
Advanced Software Option (ASO) , which includes
the File I/O Command Driver,the Call Driver for C and Pascal, and the Dynamic Link Library for
Windows 3.X languages. Contactthe manufacturer for information on this option.
NOTE: The
README.DOC file (inthe Distribution Software),contains last-minuteinformation
not included inthis manual. READMEDOC
is a readable ASCII file.
1.3 ACCESSORIES
STA-EX8
STA-U
C-1800
8-channelexpansion multiplexer.
Standard ScrewTerminalBoard.
Cableto connect ADC-16to STA-EX8 or STA-U.
ASO-ADC-16 Advanced Software Option for the ADC-16. This option includes Call
Driver for Cand Pascal,the DynamicLink Library for Windows
3.X, and
the File
I/O Driver. A user manual is also included.
1.4 SPECIFICATIONS
ADC-16 Board
A/D
Channels: 8 differential,expandable to 64 with STA-EX8Boards.
Input Resolution: 16bits (15 plus a sign bit).
Coding: Sign plus Magnitude(binary).
Input Ranges: k5 V or k3.2768 V Full Scale(jumperselectable).
Input Gains: 1, 10,or 100 (software- or jumper-selectable).
Sample Rate: 16samples/second.
Input Settling Time: 50 p.
Input Offset: Auto-zeroed; k10 pV for Gain = 100, fl LSB for Gain = 1 or 10.
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ADC-16 USER GUIDE
AbsoluteAccuracy
Gain = 1: M.O1% of range typical
Gain = 10: f0.05% of range typical
Gain = 100:
M.05% of range typical
RelativeAccuracy
Gain = l,lO, and 100
maximum.
+_0.03% maximum.
kO.lO% maximum.
k0.15% maximum.
Noise (Typical)
Gain = 1: < k1 bit rms.
Gain = 10: c +_1 bit rms.
Gain = 100: < +3 bits rms.
Input Impedance: Greater than 100 MegOhms.
Input Bias Current: 50 nA max.
Common Mode Rejection: Gain = 1 - 100 dB typ, 80 dB min.
Gain
= 10 - 110 dB typ, 86 dB min.
Gain = 100 - 120 dB typ, 92 dE3 min.
Common Mode Range: +_6 V.
Max Input Volts w/o Power On: k35 VDC.
Damage:
Power Off k20 VDC.
DIGITAL I/O
Digital Inputs
Number of Inputs: 2, TTL/CMOS compatible.
Logic Type: High inputreturns a 1.
Logic Levels: Vil = .8 V, Vih = 2.0 V.
Iil = -.2 mA, Iih = 20 uA.
Digital Outputs
Number of Outputs: 5 TTL compatible.
Logic Type: Vol = .5 V rnax at 8.5 mA.
Voh
= 2.7 V min at -0.4 mA.
Relay Outputs
Number of Channels: 2 Form C.
Max Current: 2.0 A at 28 Vrms (resistive).
POWER REQUIREMENTS
+_0.005% of range typical kO.012%
+5 V: 800 mA typ, 1 A max.
+12 V: 25 mA max.
-12 V: 15mA max.
1-4

CHAPTER 1 : INTRODUCTION
ENViRONMENTAL
Operating Temperature: 0 to 70 OC.
Storage Temperature: -25 to 85 OC.
Humidity: 0 to 95% noncondensing.
PHYSiCAL
Dimensions: 9.0 x 4.2 in. (22.9 x 10.7 cm)
Weight: 10 oz (284 g).
STA-EX8 Board
Number of Inputs: 8 differential. Each STA-EX8 board uses one ADC-16 channel; up to 8 STA-EX
boards will work with a single ADC-16.
Input Offset: Auto-zeroed; k10 pV for Gain = 100, f1 LSB for Gain = 1 or 10.
ACCURACY
Gain = 1: k.01% of Full Scale.
Gain = 10: +. 1 % typ.
Gain
= 100: 2.1% typ.
N 01s E (TYPICAL)
Gain = 1: <fl bit rms.
Gain = 10: <i2 bits rms.
Gain = 100: <+15 bits rms.
Input Impedance: Greater than 100 Megohms.
Input Bias Current: 50 nA max.
Common Mode Rejection: Gain = 1 - 100 dB typ, 80 dB min.
Gain
= 10 - 110 dB typ, 86 dT3 min.
Gain
= 100 - 120 dB typ, 92 dB min.
Common Mode Range: i6 V
Max Input Volts w/o Power On: i35VDC.
Damage:
Power Off i20VDC.
1-5