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705
Service manual
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Keithley 705 Service manual

Instruction Manual
Model 705 Scanner
Contains Operating and Servicing Information
705-001-01 Rev. F/ 4-00
WARRANTY
Keithley Instruments, Inc. warrants this product to be free frqm defects in material and workmanship for a period of I year from date of shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation.
During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.
To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for the balance of the original warranty period, or at least 90 days.
LIMITATION OF WARRANTY
This warranty does not apply to defects resulting from product modification without Keithley’s express written consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIE
S, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PRO­VIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY LNSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC.. HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIM­ITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSO.N, OR DAMAGE TO PROPERTY.
Keithley Instruments, Inc. l 28775 Aurora Road l Cleveland, OH 44139 l m-248-0400 l Fax: 440-248-6168 l http://www.keithley.com
BELGIUM: CHINA FRANCE: GERMANY: GREAT BRITAIN: [NIXA: ITALY: NETHEHLANDS: SWITZERLAND: TAIWAN:
Keittdey lnshuments B.V. Keitbley Instruments China Yuan Chen Xin Building. Room 705 * 12Yumin Road. Dew& Madian * Beijing loo029 * 8610-62022886 *Fax: 8610.62022892 Keithley Instruments Sari Keithley Instruments GmbH Keitbley Instruments Ltd Keithley Instruments GmbH Keitbley Instruments s.r.1. Keithley Instruments B.V. Keithley instruments SA Keithley Instruments Taiwan
Bargensesteenweg 709 l B-1600 Sint-Pieters-Leeuw l OZ363 00 JO l Fax 02/363 00 64
B.P. 60 l 3. all&e des Ganys * 91122 Palaisuu CSdex l 01 64 53 20 20 * Fax: 01 60 1 I 77 26 Landsberg.% Stnsse 65. D-821 IO ‘&rowing l 089/g-193 07-40 * Fax: 089/8J 93 07-34 The Minster l 58 Portman Road * Reading. Berkshire RG30 I EA * 0118-9 57 56 66. Fax: 01 IS-9 59 6-l 69 Rat 2B. WILGCRISSA l 14, Rest House Crescent l Bangalore 560 001 l 91sSC-509-1320~21 l Fax: 91-80-509-1322 Viale S. Gimignano, 38 l 2OlJ6 Milano l CY2/48 30 30 08 . Fax: 02/48 30 22 74 Postbus 559 l 4200 AN Gorinchrm l 0183-635333 s Far;: 0183-630821 Kriesbachstrasse~. 8M)o Diibendorf. 01-821 94 J4 l Fax: 01-820 30 91
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10/99
Model 705 Scanner
Instruction Manual
01982, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Sixth Printing, April 2000
Document Number: 705-901-01 Rev. F
SPECIFICATIONS
CAPACITY: Two plug-in cards per mainframe. EXPANSION CAPACITY: Daisy chain allows up to 4 SLAVE units with 1
MASTER unit.
SWITCHING RATE: 100 channels/second IlOms), programmable to 1
channel/l6 minutes 1999.999s).
RELAY DRIVE: 350mA minimum.
INTERNAL CLOCK: Displays hours/minutes/seconds or date/month; less
than 1 minute/month error (typical).
BATTERY BACKUP: Rechargeable 3.6V nickel-cadmium. 1 month reten-
tion of data (typical) with unit turned off.
IEEE-488 BUS IMPLEMENTATION
Multiline Commands: DCL, LLO, SDC, GET, GTL, UNT, UNL, SPE, SPD. Uniline Commands: IFC, REN, EOI, SRQ, ATN. Interface Functions: SHl, AHl, T6, TEO, L4, LEO, SRI, RLI, PPO, DCl,
DTI, CO, El.
Programmable Parameters: Display Mode, Output Format, EOI, SRQ,
First, Last, Open, Close, Display Channel, Alternate Output, Pole Mode, Date Format, Save/Restore, Reset, l/O Port, Time, Date, Settling Time, Interval Time, Alarm Time, Program Mode, Trigger Mode, Terminator, Self Test.
Digital I/O Port: A separate I/O port consisting of eight input and eight out-
put lines as well as common (IEEE-488) and +SVDC. Outputs will drive one TTL load. Inputs represent one TTL load. Mating connector supplied.
FRONT PANEL PROGRAMS
0 - Digital I/O
I* - Date Format
2’ -Settle Time
3” - IEEE Address 4* -Save Setup
5* - Restore Setup 6* - Poles 7 -Alarm Time
8 - Self Test %I* - Stand Alone 91’ - Master 92’ - Slave 99 -Reset
*Battery backed up.
Read or change state on digital I/O port. Changes date display between MM.DD and
DD.MM. Time to output CHANNEL READY pulse after
closing relay. Set bus address; cannot be programmed from bus. Stores present relay setup in numbered (I - 5)
buffer. Recalls relay setup in buffer 1 - 5. 1, 2 or 4-pole configuration for switching. Set time for Alarm output pulse; repeats daily. Check RAM, ROM, LEDs. Single 705 configuration. Daisy chain configuration. Daisy chain configuration. Reset battery backup parameters to factory values.
GENERAL
DISPLAY: Six 0.5” LED digits with decimal point, function and IEEE status
annunciators.
OPERATING ENVIRONMENT: O” to 50°C, 0% to 80% relative humidity
up to 35oc.
STORAGE ENVIRONMENT: -25O to 65°C.
CONNECTORS: Four BNC; External Trigger, Alarm Out/Serial-In, Channel
Ready, Serial Out (TTL compatible).
POWER: 105-125V or 210-250V (internal switch selected), 5OHz to4OOHz.25
V*A maximum. 90-IIOV and 180.220V version available.
DIMENSIONS, WEIGHT: 127mm high x 216mm wide x 359mm deep (5”
x 8%” x 14%“). Net weight 3kg (6% lbs.).
ACCESSORIES AVAILABLE:
Model 1019A: 5%” Universal Fixed Rack Mounting Kit Model 1019s: 5%” Universal Slide Rack Mounting Kit Model 4801: Model 7008-3: Model 7008-6: IEEE-488 Cable, 1.8m (6 ft.) Model 7010: Model 7024-3: Triaxial Cable, 0.9m (3 ft.) Model 7024-10:Triaxial Cable, 3.0m (IO ft.) Model 7055: Model 7056: Model 7057: Model 7058: Model 7059:
BNC-to-BNC Cable IEEE-488 Cable, 0.9m I3 ft.)
IEEE-488 Adapter for Model 85 Computer
Quick Disconnect Card General Purpose Scanner Card Thermocouple Scanner Card Low Current Scanner Card Low Voltage Scanner Card
Specifications subject to change without notice.
SPECIFICATION ADDENDUM
1. Batten/ back-up time is for unit at 23OC. Operation or storage at higher temperatures could reduce this time below 1 month. Even under extremes a fully charged system should last a week.
2. Note that some plug-in card specifications may limit mainframe perfor­mance when installed (e.g. Humidity).
3. Relay drive capability at 400Hz is limited to 200mA typical and a max­imum ambient temperature of 35OC.
Table of Contents
1
2
General Information
Introduction. Features Warranty Information Manual Addenda Safety Symbols and Tenns.. Unpacking and Inspection Specifications.. Accessories.. Repacking for Shipment
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................................................................................................................................ l-1
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Operation
Introduction
Preparation for Use
Correct Line Voltage.
Plug-In Card (Scanner) Power-up Environmental Conditions Operating Instructions
Front Panel Controls
Rear Panel Description
Basic Front Panel Operation
Front Panel
Program 0 Digital I/O Program 1 Date Format Program 2 Program 3 Primary Address.. Program 4 Program 5 Program 6 Pole Modes..
......................................................................................................................................................... 2-1
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Installation ............................................................................................................ 2- 1
...................................................................................................................................................... 2-l
.......
Programs..
Settle
Save Recall
Program 7 Program 8 Self Test Program 90 Stand Alone..
Program 9 1 Master.. ..................................................................................................................................
Program 92 Slave Program 99 Reset..
Set
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Time
Present
Stored
Alarm Time
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........................................................................................................................ 2-13
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,
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Relay
Set Up..
Relay
Set
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Up.. ................................................................................................... 2- 15
l-l 1-l 1-l l-1
l-l l-1 1-I l-2
2-1 2-1
2-3 2-3 2-3 2-5 2-7
2-13 2-13
2- 1-l 2-14
2- 15
2-16 2-17
2-18
2-18
2- 18 2-19
2- 19
3
IEEE Bus Operation
Introduction .........................................................................................................................................................
Soltwarc Considcrstions ..............................................................................................................................
HP-85 BASIC Statements
Interface Function Codes .............................................................................................................................
Model 705 Interface Commands..
IEEE-388 Bus Lines ............................................................................................................................................
Bus Management Lines.. .............................................................................................................................
Handshake
Data Lines.. ..................................................................................................................................................
System Set up Procedure.. ...................................................................................................................................
Bus Commands ....................................................................................................................................................
Uniline Commands.. ....................................................................................................................................
Universal Commands ..................................................................................................................................
Addressed Commands.. Device-Dependent Commands
Display Mode
Program (Scan) hlode.. ..............................................................................................................................
Prefix
EOI
Bus Response hlodc (SRQ I
Trigger Modes
Programmable Terminator I Y).
Inputs Status Byte Format Status Word (UO). Front Panel Programs Front Panel Error Messages
IDDC Error
No Remote Error.. Scanning Program
Lines
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3-I 3- !
3-2
i-.3
.3-? 3-3
3-J .3-J
3-4 j-5
.3-5 3-6
3-7
­3-8
­1-8
-
3- 12 3-12
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3-12
­.?- 13
3-35
. 3-15
i-15
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3-23
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3.24
_
3-24
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1-25
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3-25
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3-25
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5
Theory of Operation
Introduction
Power Supply.. Microcomputer Display Circuit.. IEEE-488 Interface Circuitry
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Maintenance
Introduction Fuse Replacement Lint Voltage Selection
Disassembly ............................................................................................................
Troubleshooting.. .................................................................................................................................................
Digital Self Test..
Battery Charge .....................................................................................................................................................
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4- I 4 I
4- I 4-3 4-3
5-l
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4-I
S-l
5-1
5-3
5-3
_
5-3
Replaceable Parts
Introduction.. .......................................................................................................................................................
Parts List .............................................................................................................................................................
Ordering In~orniation .......................................................................................................................................... h- I
Factory Service.. .................................................................................................................................................. 6- I
Schematic Diagrams and Component Location Drawings ................................................................................. 6- I
h-l 6-I
III
List of Illustrations
2
Figure 2- 1 Figure 2-2 Figure 2-3
3
Figure 3- 1 Figure 3-2 Figure 3-3 Figure 3-4 Figure 3-5 Figure 3-6 Figure 3-7 Figure 3-8 Figure 3-9
Operation
Scanner Card Installation Model 705 Front and Rear Daisy Chaining Three Model
............................................................................................................................
Panels.. .............................................................................................................
705’s.. ..........................................................................................................
IEEE Bus Operation
Bus Structure.... .
Handshake Sequence... Contact Assignment . Model 705 IEEE Bus Digital I/O Port Pin Assignments..
LJ and G Modes Sequence . . . . . . . . .
Status B) te Format . . . . . . . . . . . . . . . . . . .
U4 Status Word (Reset conditions shown) . . .
IEEE Display Error Messages . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .......
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..~..................
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Theory of Operation
Figure 4-l Figure 4-2
Model 705 Block Diagram Memory Map
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. . . . . . . . 3-3
. . . ..I. 3-4
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-7
i ­2-6 2-9
3-5
_
3-5
1-19
­3-23 7-23
­1-24
­3-25
4-2 4-l
5
Figure 5- 1
6
Figure 6- 1
Figure 6-2
Figure 6-3
Figure 6-4 Figure 6-5 Figure 6-6 Figure 6-7 Figure 6-8
Maintenance
Model 705 Exploded View
,,.................,.,......,............................................................................................
Replaceable Parts
Interconnect Board, Component Location Drawing, Dwg. No. 705- 160.. Display Board, Component Location Drawin,. I/O Board, Component Location Drawing, Dwg. No. 705-173 Mother Board. Component Location Drawing, Dwg. No. 705-100
Mother Board, Display Board, Schematic Diagram, Dwg. No. 705-I 16 I/O Board, Schematic Diagram, Dwg. No. 705-176 Interconnect Board, Schematic Diagram, Dwg. No. 705- 166
Schetnatic Diagram, Dwg.
u Dwg. No. 705-I 10
No, 7OS- 106..
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5-2
6-7
6-9 6-11 6-13 6- 17 6-23 6-25 6-27
List of Tables
2
Table 2-l Table 2-2 Table 2-3 Table 2-4 Table 2-S
3
Table I- 1 Table i-2 Table 3-3 Table i-4 Table 3-5 Table 3-6 Table 3-7 Table 3-8 Table 3-9 Table 3-10
5
Table 5-l Table 5-2 Table 5-3
Operation
Line Voltage Setting Power Up Default Conditions (Front Summary of Front Panel Programs Switchins Card Pole Modes Program 99 Reset Conditions
...................................................................................................................................
Panel Operation). .............................................................................
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IEEE Bus Operation
HP-85 IEEE-488 BASIC Statements.. Model 705 Interface Function
IEEE Command Groups.. ............................................................................................................................
IEEE Bus Connector Contact Power-Up Default Values SDC Set Conditions Device-Dependent Comtnands Hierarchy of Command Execution SRQ Commands and Conditions Digital I/O Port Contact Pin Assignments.
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Codes.. ........................................................................................................
Designations.. ..............................................................................................
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Maintenance
Fuse Replacement. 3AG size.. Fuse Replacement. 5mm size.. Line Voltage Selection..
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2- I
2-3 2- I.3 2- 16 2-20
3-2
3-3
3-3
3-5
1-6
1-7
-
3-9
_
Z-10 3-13
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3-20
5- I
5-I
5-I
6
Table 6- 1 Table 6-2 Table 6-3 Table 6-4 Table 6-5
Replaceable Parts
Index of ~Modcl 705 Schematics and Component Layouts.. Display Board 705-I IO. Parts List.. Mother Board 705- 103. Parts Digital I/O Board 705 173. Parts List.. k/lode1 705 Mechanical Parts List
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List.. .............................................................................................................
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6- 1
6-2
6-3
6-5
6-6
vii
SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
The Model 705 is a low cost IEEE compatible scanner. The basic mainframe can accomodate two plug-in scanner cards. Each card can have different pole configurations. In the l-pole
configuration the card has 20 channels, The 4-pole configura­tion allows 10 channels with two cards (for four-wire ohms). Using the “daisy chain” method the Model 705, along with four additional Model 705’s, can provide up to 100 2-pole channels. The time and the date are kept internally with a bat­tery backed up clock allowing time dependent procedures to be performed,
The controls on the front panel allow opening a selected chan­nel, closing the channel, scanning between a selectable first and last channel, selectable scan rate and mode. There are 13 internal programs that are accessible from the front panel. The programs can select primary address, dwell time, store a relay
set up, recall the stored relay set up, control the digital l/O port, switch from International to American date format, con­trol interval stop/start and select I-, 2- or 4 pole measurement modes.
The Model 705 Scanner adheres to standard IEEE-488 inter­face bus protocol. This enables the Model 705 to be incor­porated into any measurement system that uses programmed control through the IEEE-488 bus.
1.2 FEATURES
The Model 705 Scanner includes the following features:
*IEEE-488 bus operation. *Selectable scan rate from IOms to 999.999sec. *Selectable scan modes that allow the operator to scan the
first channel to the last channel once, continuously or manually.
*Thirteen internal programs that are available through the front
panel.
*Model 705 mainframe can accomodate two scanner plug-in
cards.
aSeveral different scanner relay cards are available as options.
They include: a general purpose relay card; a thermocouple relay card; a low voltage relay card; and a low current relay card.
*Time and date are kept with a battery backed up clock.
*Digital I/O port with eight lines as inputs and eight lines as
outputs.
1.3 WARRANTY INFORMATION
Warranty information is provided on the inside front cover of this manual. If there is a need to exercise the warranty, contact the Keithley representative in your area to determine the proper
action to be taken. Keithley maintains complete repair and calibration facilities in the United States, West Germany, Great
Britain, France, the Netherlands, Switzerland and Austria. In­formation concerning the application, operation or service of your instrument may be directed to the applications engineer at any of the above locations. Check the inside front cover of this
manual for addresses.
l’.4 MANUAL ADDENDA
Improvements or changes to this manual will be explained on an addendum included with this manual,
1.5 SAFETY SYMBOLS AND TERMS
Safety symbols used in this manual are as follows:
A
The symbol should refer to the operating instructions.
The symbol
more may be present on the terminal(s).
The WARNING used in this manual explains dangers that
could result in personal injury or death.
The CAUTION used in this manual explains hazards that could damage the instrument.
1.6 UNPACKING AND INSPECTION
The Model 705 is inspected both mechanically and electrically before shipment. Upon receiving the Model 705 unpack all items from the shipping container and check for any obvious damage that may have occurred during transit. Report any damage to the shipping agent. Retain and use the original packaging materials if reshipment is necessary. The following items are shipped with all Model 705 orders:
*Model 705 Scanner *Model 705 Instruction Manual *Optional accessories per request.
1.7 SPECIFICATIONS
For Model 705 detailed specifications, refer to the specifica­tions that precede this section.
1.8 ACCESSORIES
Model 1019A Rack Mounting Kit-The Model 1019A rack’
mounting kit can accomodate one or two Model 705’s. The’ dimensions are 133mm x 483mm (5% x 19in).
Model 1019s Slide Rack Mounting Kit-Enables one or two half rack size instruments to be rack mounted with the added feature of sliding the instrument(s) for easy access. The dimensions are 133mm x 483mm (5% x Igin.).
on the instrument denotes that the user
on the instrument denotes that IOOOV or
/v
l-l
Model 7055 Quick Disconnect Card-The Model 7055 is
an integral part of the Model 7056 General Purpose Scanner
Card. The Model 7055 is the section of the Model 7056 that
provides the input and output connections. Several Model
7055s can be prewired for particular applications, When that
particular application is required the present Model 7055 can be replaced with another Model 7055.
Model 7056 General Purpose Scanner Plug-In Card-The
Model 7056 is field installable in the Model 705 Scanner main­frame. The general purpose card will switch up to 10 2-pole channels. The card can be used as a voltage scanner, indepen­dent relay card or a matrix card. The 2-pole switching is ac­complished in less than 10ms and the expected relay life is 106 closures at the maximum contact ratings. Barrier strips are used to facilitate input and output connections to the relay scanner plug-in card. The plug-in card can be easily removed through the rear panel of the Model 705.
Model 7057 Thermocouple Scanner Plug-In Card-The
Model 7057 is a low voltage scanner card which is field install­able in the Model 705 scanner mainframe. Since it combines the functions of a thermocouple scanner and uniform tempera­ture reference it is especially useful for scanning thermo­couples. The input terminals are #I10 alloy-copper set in an isothermal block to minimize temperature differences. A ther­mistor sensor within the isothermal block is used with a bridge network on a Model 7057 to give an indication of the
temperature reference or cold junction. The temperature of the
heat sink is used to calculate the corrected thermocouple out­put. The output voltages of each thermocouple must be con-
verted to temperature (OC or OF) using appropriate thermo-
couple tables or polynomial equations. In addition any channel may be used to monitor low level signals. The Model 7057 uses two form A contacts for scanning of signals up to 35V peak or 100mA peak. Input and output connections are made
through the rear panel of the scanner mainframe using #4 screw terminals on the Model 7057.
Model 7058 Low Current Scanner Plug-In Card-The
Model 7058 is field installable in the Model 705 Scanner Main-
frame. The low current card will switch up to 10 l-pole chan-
nels. For optimum low level current switching, the Model 7058 is designed to minimize offset current error (less than I pAI,
while guarding ensures that high isolation is maintained be­tween input signals. The break-before-make, single pole switching of the Model 7058 is designed to maintain current
paths for signals not connected to the output, or when internal
jumpers are removed to provide high input resistance for mak-
ing voltage measurements. AC or DC signals up to 28V or 100mA may be scanned. Triaxial input and output connections
to the scanner plug-in card are easily made through the rear
panel of the Model 705 Scanner mainframe.
Model 7059 Low Voltage Plug-In Card-The Model 7059 is a low voltage scanner plug-in card which is field installable in the Model 705 Scanner mainframe. The Model 7059 will switch up to 10 channels. For low level transducer and thermo­couple output switching the Model 7059 is designed to minimize thermal error voltage (less than 1p.V with respect to copper) and ensure that high isolation (10X2) is maintained between input signals. The break-before-make, 2-pole switch-
ing is accomplished in less than 5ms. Expected relay life (108 closures) is obtained when signals less than IOV or less than 10mA are scanned. However, peak signals up to 200V or IOOmA may be scanned. Barrier strips are used to facilitate in­put and output connections to the scanner plug-in card. The Model 7059 is easily removed through the rear panel of the Model 705 Scanner mainframe.
Model 7008-3 IEEE-488 Cable-The Model 7008-3 is a three foot (I meter) IEEE-488 cable. The cable has 24 stranded wire conductors and is terminated with IEEE-488 standard connec­tors.
Model 7008-6 IEEE-488 Cable-The Model 7008-6 is a six foot (2 meter) IEEE-488 cable. The cable has 24 stranded wire conductors and is terminated with IEEE-488 standard connec­tors.
Model 4801 Low Noise BNC to BNC Cable-The Model 4801 is a low noise BNC-to-BNC cable which is especially useful for “daisy chain” wiring configurations of multiple Model 705’s.
Model 7010 Cable Adapter-The Model 7010 is an IEEE-488 cable adapter. The adapter extends the IEEE-488 connector by one connecter width.
1.9 REPACKING FOR SHIPMENT
The Model 705 should be packed in its original carton. Before packaging, wrap the instrument in plastic. After it is placed in the box, surround the instrument with Styrofoam packaging material.
If the Model 705 is to be returned to Keithley Instruments for calibration or repair, include the following:
*ATTENTION REPAIR DEPARTMENT on the address label. *Warranty status of the instrument. *Completed service form.
1-2
SECTION 2
OPERATION
2.1 INTRODUCTION
This section contains information necessary to operate the
Model 705 Scanner. Information is arranged as follows:
*Preparation For Use
*Power-Up
*Environmental Conditions
*Front and Rear Panels Description *Front Panel Operation *Front Panel Programs
2.2 PREPARATION FOR USE
2.2.1 Correct Line Voltage
Plug the Model 705 into the proper power receptacle, (See
Table 2-l 1. For fuse replacement or line voltage switch setting,
refer to the maintenance section.
WARNING Ground the instrument through a properly earth grounded receptacle before operation. Failure to ground the instrument can result in severe injury or death in the event of short circuit or malfunction.
Table 2-1. Line Voltage Setting
on the shown
2. To remove a plug-in card, unfasten the locking tabs by pull­ing both tabs outward. Grasp the end of the card and pull it out of the mainframe,
2.3 POWER-UP
Immediately after turning on the Model 705 via the power switch, the display indicates the following for several seconds:
1. This is a display test. The operator can note inoperative display segments by comparing the Model 705’s display with the figure above.
2. In addition, the push button and the TALK, LISTEN and REMOTE indicators turn on. All indicators turn on
simultaneously if operating correctly.
After the test is complete, the Model 705 displays the software revision level for approximately one second.
card should be snapped into the locked position as in Figure 2-1. .
NOTE
Handle the plug in cards by the edges to avoid contaminating them with dirt, body oil etc.
NOTE
Batten/ BIOI is charging while the unit is on. Refer to paragraph 5.7.
*Requires special factory installed transformer.
2.2.2 Plug-In Card (Scanner) Installation
Before operating the Model 705, the necessary plug-in cards must be installed into the mainframe. The scanner plug-in card is installed via the opening on the Model 705 rear panel. Refer to Figure 2-l for an overall picture of plug-in card installation.
WARNING To prevent a possible shock hazard, turn the instrument off and remove the line cord before removing or installing any scanner plug-in card.
1. To install a plug-in card, slide the plug-in card into the rear panel opening with the component side facing up. Make certain the card edges are aligned with the grooves in the receptacle. When the card is fully inserted, the locking tabs
After the software revision level is displayed, the Model 705 displays the primary address of the instrument for approx­imately one second. The primary address of the Model 705 is
factory set at 17.
During the display test the Model 705 performs a digital self
test of the RAM circuitry and a cyclic redundancy check of the
ROM circuitry. If the self test or CRC reveals a problem with
the ROM or RAM circuitry the Model 705 displays a diagnostic
number. This number, and its meaning, is explained in detail in Section 5.
After all the displays and tests of the power up cycle, the
Model 705 comes up to the default conditions. Refer to Table
2-2 for default conditions.
NOTE
If upon power-up the Model 705 displays the
slave or broken loop message (refer to paragraphs
2.6.10, 2.6.11 and 2.6.12) activate program 90 to return the Model 705 to normal operating condi-
tions. To activate program 90, press PRGM, 9, 0.
-SCANNER CARD
INSTALLED
CARD-
SLOTS
r4x-SCANNER CARD
2-2
Figure 2-l. Scanner Card Installation
Table 2-2. Power Up Default Conditions (Front Panel
Operation)
Function or Program Default Conditions
CHANNEL
TIME DATE RESET INTERVAL SINGLE CONTINUOUS Continuous scan mode is set to inactive. START/STOP Start/Stop function is set to Stop. Program 0
Program 1 Program 2 Program 3
Program 4 Program 5 Program 6
Program 7 Program 8 Program 90 Program 91 Program 92 Program 99 FIRST
LAST
*If Channel 1 was previously programmed as the first chan­nel, last channel or both it is displayed as such. This is because the FIRST and LAST functions are battery backed up and therefore not affected by power up.
To identify the previous state of the functions that are not affected by power up simply activate the desired function. When the function is acti­vated the previous state for that function is dis-
played. Refer to paragraph 2.5.1 Front Panel Controls for information concerning the actuation of the desired function.
Channel mode is selected, Channel 1 is
displayed and all channels are open.*
Time is not affected by power up.
Date is not affected by power up. Reset is not affected by power up. Interval time is not affected by power up. Single scan mode is set to inactive.
Digital I/O outputs are set to 000, inputs
are not affected by power up. Date format is not affected by power up. Settle time is not affected by power up. Primary address is not affected by power
up. Save relay set up is cleared.
Recall relay set up is cleared. Number of poles is not affected by power
Ayirrn time is set to 00.00.00.
Self test is not activated. Program 90 is not affected by power up. Program 91 is not affected by power up. Program 92 is not affected by power up. Program 99 is not activated. The First function is not affected by powe
up.
The Last function is not affected by powe
up*
NOTE
2.5.1 Front Panel Controls
1, The power ON/OFF switch operates on the push-push prin-
ciple. Depressing this button turns the instrument on. Once the instrument is on, pressing (releasing) this button turns the instrument off. When the Model 705 is turned on it goes through a power-up sequence as outlined in paragraph 2.3. When the power-up sequence is complete the Model 705 displays the following:
r D I F .a
I
01 = Channel Number One
F = First Channel* 0 = Channel Open The CHANNEL LED lights, indicating that the Model 705 is in the channel mode.
*If Channel 1 was previously progammed as the first channel,
last channel or both, it is displayed as such. This is because -li the FIRST and LAST functions are battery backed up and not affected by power up.
2. The CHANNEL button selects the channel mode for display. The channel number is displayed on the front panel as a two digit number. Upon power-up, the Model 705 reverts to the
channel mode. Pressing the CHANNEL button while the Model 705 is in the channel mode increments the channel number by one. Pressing the CLOCK, DATE, PRGM, SINGLE, CONTINUOUS or INTERVAL buttons takes the Model 705 out of the channel mode. Pressing the RESET button during any of the front panel programs except Pro­grams 90, 91, 92 and 99 (see paragraph 2.6 for front panel program information) reverts the Model 705 to the channel mode.
3. The OPERATION group consists of four buttons: FIRST, LAST, CLOSE and OPEN. The buttons are described as
follows:
A. The CLOSE button when activated, closes the presently
displayed channel. If the presently displayed channel is already closed, pressing the CLOSE button has no effect on the channel. When the presently displayed channel is open and the CLOSE button is pressed, the open and closed digit (furthest digit on the right of the display) changes as follows.
/
2.4 ENVIRONMENTAL CONDITIONS
All operation of the Model 705 should take place at an ambient temperature within the range of O°C to 50°C, up to 35OC at 80% noncondensing relative humidity. Environmental condi­tions for storage are -25OC to + 65OC.
2.5 OPERATING INSTRUCTIONS
0 Indicates a channel is open, and that C indicates a channel is closed.
B. The OPEN button when activated, opens the presently
displayed channel. If the presently displayed channel is already open, pressing the OPEN button has no effect on the channel. When the presently displayed channel is closed, and the OPEN button is pressed, the open and close digit (furthest digit on the right of the display) changes as follows.
2-3
L
I
C Indicates a closed channel, and that 0 indicates an open channel.
NOTE Close and open for each channel remain valid even when not viewing the channel or the display.
C. The FIRST button, when pressed, specifies the presently
displayed channel as the first channel of a multichannel configuration. If the presently displayed channel has already been specified as the first channel, pressing the FIRST button has no effect on the channel or the display. If the presently displayed channel has not been specified as the first channel, the display format is shown as follows:
11
01 = Present Channel
0 = Channel Open
Pressing the FIRST button specifies the channel as the
first channel and the display format is shown as follows:
1 UI f 3/
01 = Present Channel
F = First channel of a multichannel configuration
0 = Channel open
NOTE There are two ways to change the specified first channel, one is to select the desired new channel and then press the FIRST button; the other way
is to activiate front panel Program 99 (refer to paragraph 2.6). Powering the unit down will not change the specified first channel.
The LAST button when pressed specifies the presently
D.
displayed channel as the last channel of a multichannel configuration. If the presently displayed channel has already been specified as the last channel, pressing the
LAST button has no effect on the channel or the display. If the presently displayed channel has not been specified as the last channel of a multichannel configuration, the display format is as follows:
I 113 ul
t
10 = Present Channel 0 = Channel Open
Pressing the LAST button specifies the channel as the
last channel of a multichannel configuration and the
display format is as follows:
I
10 = Present Channel L= Last Channel of a Multichannel Configuration
0 = Channel Open
NOTE There are two ways to change the specified last channel, one is to select the desired new channel and then press the LAST button, the other way is to activate front panel Program 99 (refer to paragraph 2.6). Powering the unit down will not change the specified last channel.
4. The CONTROL group of buttons consist of the RESET but­ton and the INTERVAL button. The buttons are described as follows:
The RESET button opens all channels of the Model 705
A.
and reverts the display to the specified first channel. The
RESET button is inactive in the time, interval and date
modes. Pressing the RESET button during a Single or
Continuous scan mode sequence stops the scan mode, opens all the channels, and reverts the display to the specified first channel.
The INTERVAL button selects the programmed interval
B
time for display. The inten/al time is the programmed
time each channel is closed when using the single, con-
tinuous, or step scanning modes. The interval time
ranges from 5msec to 999.999sec in 1 msec increments.
Upon the actuation of front panel Program 99 the interval
time is reverted to the default condition of 10msec
(displayed as 000.010). Powering the unit down will not
change the programmed interval time. Two ways the in-
terval time can be changed is either, activate front panel
Program 99; (see paragraph 2.6) or press the INTERVAL
button, and then press the appropriate numbers from
000.010 to 999.999 and the ENTER button.
5. The DATA group of buttons consist of the O-9, CANCEL and ENTER buttons. They are described as follows:
The O-9 data keys allow entry of numerical data onto the
A.
display. The O-9 keys can be used to enter numerical constants on the display for certain functions such as in­terval time, channel number, front panel programs, time and date.
The ENTER button loads the displayed data for the inter-
B.
val time, date and program modes into the Model 705. In the PRGM mode, the ENTER button initiates the select­ed program (0, 1,2, 3, 6 or 7) after the necessary data is
entered onto the display. Refer to paragraph 2.6 for infor­mation concerning the front panel programs.
During the entry of data (c segment cursor is flashing)
C.
the CANCEL button cancels the present display and
reverts the instrument to the previous display. The CANCEL button is functional only when entering data onto the display in the interval, time, date and program modes.
2-4
6.
The SCAN group of buttons consists of the SINGLE, CON­TINUOUS and START/STOP buttons. These three buttons select the different scan modes. The SCAN group of but­tons are described as follows:
A. The CONTINUOUS button selects the continuous scan
mode. The continuous scan mode allows the user to
scan through the programmed channels at the program-
med interval rate continuously. The continuous scan
mode is initiated upon the actuation of the START/STOP button or upon receiving the appropriate external trigger pulse. Pressing the START/STOP but-
ton while the continuous scan mode is running stops the scan at the presently displayed channel. Pressing the START/STOP button again starts the continuous scan at the channel in which it was stopped.
B.
The SINGLE button selects the single scan mode. The single scan mode allows the user to scan through the programmed channels at the programmed interval rate one time. The single scan mode is initiated upon the ac­tuation of the START/STOP button or upon receiving the appropriate external trigger pulse. Pressing the START/STOP button while the single scan mode is run­ning stops the scan at the presently displayed channel. Unless interrupted, the single scan mode will scan through the programmed channels at the programmed interval rate and then stop at the programmed first chan­nel.
C.
The START/STOP button is an alternate action control that has three functions. The three functions are the START function, the STOP function and the STEP scan mode. They are described as follows:
a. The start function of the START/STOP button in-
itiates the selected scan mode. When all the para­meters (interval, time, first and last channels, scan mode, etc.) of a multichannel configuration have been programmed and the user is ready to scan the channels, press the START/STOP button to initiate the scan. During the scan mode the START/STOP LED is activated.
b. The stop function of the START/STOP button stops
the previously initiated scan mode. That is, pressing the START/STOP button during a scan stops the sequence at the presently displayed channel and turns off the START/STOP LED. The stop function of the START/STOP button is active only when a scanning sequence is scanning.
c. The step scan mode allows the user to manually step
through the programmed channels. The step scan mode is selected by pressing the channel button, pro­gramming the interval time and pressing the START/STOP button. When the interval time has been programmed and the user is ready to manually scan the channels, press the START/STOP button to scan (closed and open channel at the programmed in­terval time) one channel. Upon initiating the step scan mode the START/STOP LED turns on, the presently displayed channel is closed for the programmed inter­val rate, the channel is opened, the START/STOP
LED turns off and the Model 705 advances to the next channel. To scan the next channel press the START/STOP button and the Model 705 will go through the same sequence.
7. The CLOCK group consists of two buttons that control the display of the time function and the date function. The clock continues to run after the instrument is powered down because the clock’s power circuitn/ is backed up by battery
BTlOl. The two clock buttons are described as follows:
A. The TIME button selects for display the 24 hour time
clock. The format showing 2:45 p.m. is as follows:
I IYYS.UU /
i I
The time can be set by pressing the TIME button, enter­ing the appropriate time onto the display and then press­ing the ENTER button.
B. The DATE button selects the date mode for display. The
date display has two formats., The formats showing Auaust 18th are as follows:
American date format
International date format
The formats are selected by front panel Program 1. Refer to paragraph 2.5 6 for information concerning the front panel programs. The date can be set by pressing the
DATE button, entering the appropriate date onto the
display and then pressing ENTER.
8. The PRGM button when pressed shows a display that pro­mpts the user to select one of the 13 front panel programs. Refer to paragraph 2.6 for complete details and examples of
the front panel programs.
9. The IEEE bus indicators (TALK, LISTEN and REMOTE) identify the present status of the IEEE-488 bus. The in-
dicators are described as follows: A. The TALK LED when lit indicates that the Model 705 is
in the talk mode. The Model 705 does not have to be in
the remote mode for it to be in the talk mode.
B. The LISTEN LED when lit indicates that the Model 705 is
in the listen mode. The Model 705 must also be in the remote mode for it to be in the listen mode.
C. The REMOTE LED when lit indicates that the Model 705
is in the remote mode.
2.5.2 Rear Panel Description
1. The two plug-in slots in the Model 705 mainframe can ac­comodate two relay scanner cards. The Model 705 with two relay scanner cards has up to 20 2-pole individual channels. Refer to paragraph 2.2.2 for instructions on how to remove or install the various plug-in cards.
cl0 I8
I I
Ifm3 I
2-5
fi?ciEq
705 SCANNER
\ 4
OPERATION
DATA
7 8
9
q ncl
POWER
a ON
1 OFF
i
n
v
0
RESET
sl fl
L&l
INTERVAL CONTINUOUS
/\
SCAN
.
PRGM
4
q
IC
SERIAL
hxl
0 CANCEL ENTER
non
DIGITAL I/O
OUT SERIAL IN
ALARM /
I
@-/-@I
30V ‘MAX.
h
2-6
f~.:,~~;:G;O
m<~t~~cncoaouL
L
IEEE 488 INTERFACE
I
Figure 2-2. Model 705 Front and Rear Panels
LINE RATING
50-400 Hz AC ONLY
25 VA MAX
LINE
FUSE
SLOWSLOW
3ll6A 90- 125V
l/lOA 195-250V
LINE VOLTAGE
SELECTED (INTERNAL)
go-1lOV 0 195-235v a
105-125V 0 210-250V 0
2. The EXTERNAL TRIGGER is a BNC connector that initiates the selected scan mode (single, step or continuous) in the same manner as the START/STOP button, The input trig­ger pulse must be a negative going pulse at a TTL level with a minimum duration of 2+ec. The selected program mode is initiated upon the negative transition of the pulse. This feature can be used to trigger the Model 705 into the selected scan mode using another instrument.
3. CHANNEL READY is a BNC output connector that provides a negative going TTL level pulse of greater than lO@ec at the completion of the programmed channel settling time. This feature can be used to inform another instrument (e.g.
DMM, Source, etc,) that the present channel settling time is
completed.
4. The ALARM/SERIAL IN connector has two functions. The Alarm out function and the SERIAL IN function. As the Alarm out function the Model 705 outputs a negative going TTL level greater than 10pec pulse to the ALARM/SERIAL
IN connector. When the Alarm time is set to 00.00.00 the
pulse does not appear. The SERIAL IN function is used in a daisy chain configuration where the SERIAL IN connector is connected to the SERIAL OUT connector of another Model
705. Refer to paragraph 2.5.3 example 4 for more informa­tion.
5. SERIAL OUT is a BNC output connector that provides con­nection to another Model 705 for a daisy chain configura-
tion. Refer to Figure 2-3 for a typical daisy chain configura­tion. The SERIAL OUT connector is applied to the ALARM/SERIAL IN connector of another Model 705.
6. The Digital I/O port consists of 16 digital input/output lines
along with four lines that are + 5V and IEEE common. Eight of the I/O lines can be used for inputs and eight can be used for outputs. This allows the user a limited number of control
lines to the IEEE bus. The outputs will drive one TTL load
and the inputs are TTL compatible. For more information concerning the digital I/O port refer to paragraph 3.5.8/16.
7. The IEEE bus connector provides bus connection to the Model 705. The connector mates with the Keithley Model
7008-3 and Model 7008-6 cables. For more detailed infor-
mation concerning the IEEE connector refer to paragraph
3.3.
8. The line power fuse is rated as specified in Table 5-l.
9. The line power receptacle mates with three wire line cord which provides connections to line voltage. For correct line voltage selection refer to paragraph 5.3.
2.5.3 Basic Front Panel Operation
This section provides the information necessary for basic front
panel operation of the Model 705. There are a number of steps
to follow in order to get the Model 705 ready for scanning
operation. These steps are as follows:
1. Install the desired scanner card(s). Refer to paragraph 2.2.2 for information concerning the installation of the scanner
cards into the Model 705.
2. Select appropriate line voltage. Refer to paragraph 2.2.1 for information concerning the selection of the appropriate line
voltage. Turn the Model 705 on. The instrument goes
through the power-up sequence described in paragraph 2.3 and displays the following:
I III f o!
NOTE
Channel 1 is set as the programmed first channel, unless the unit was previously programmed for
another channel then that channel is displayed.
3. Program the desired channel. A. Select the first channel.
a. Press the desired channel number from the DATA
group buttons O-9.
b. Press the FIRST button to program the present chan-
nel as the first channel.
NOTE
Selecting a channel that does not exist in the pre­sent set up causes the Model 705 to display the following message.
/-Ia
9. Select the last channel: a. Press the desired number from the DATA group but-
tons O-9.
b. Press the LAST button to program the present chan-
nel as the last channel.
4. Program the desired number of poles (I-, 2- or 4-pole). A. Press PRGM.
9. Press 6 (refer to paragraph 2.6.7).
C. Select number of poles l-, 2- or 4-pole.
D. Press ENTER.
5. Program the interval time A. Press the INTERVAL button to select the interval mode
for display.
9. Enter the interval time on the display by pressing from the DATA group, desired time 000.010 to 999.999 seconds.
C. Press the ENTER button.
6. Program the desired scan mode. Press the SINGLE or CON­TINUOUS button to select one of these two scanning
modes. To select the step scan mode press the channel but-
ton and the START/STOP button.
7. Press the START/STOP button to start the scanning
sequence. For the step scan mode press the START/STOP button each time a single channel is to be scanned.
l-h
2-7
Steps 1 through 7 show how to get the Model 705 into a scanning sequence. The next examples show how to use the different scan modes, how to daisy chain several Model 705’s for an extended number of channels, and scanning
using different scanner cards,
Example 1 Manual Scan-The Model 705 can be program­med for the step scan mode, if it is desired to scan through the programmed channels manually. In the step scan mode the programmed channels can be scanned (closed for the pro­grammed interval rate and then opened) one channel at a time. Upon the actuation of the START/STOP button a single chan­nel will be scanned. For this example, choose the following parameters:
1. First channel is 1.
2. Last channel is 10.
3. Interval time is two seconds.
4. Number of poles is two.
5. Use the step scan mode.
Use the following procedure to program the Model 705 for the preceding parameters:
1. Install the desired scanner card into the Model 705. Refer to paragraph 2.2.2.
2. Select the appropriate line voltage and turn the Model 705 on. Refer to paragraphs 2.2.1 and 2.3 respectively.
3. Press PRGM, 6, 2, ENTER. For more complete information refer to paragraph 2.6.7.
4. Press 0, 1, FIRST. (Programs channel 1 as the first channel.)
5. Press 1, 0, LAST. (Programs channel 10 as the last channel.)
6. Press INTERVAL, 0, 0, 2, 0, 0, 0, ENTER. (Programs the in­terval time for two seconds.)
7. Press CHANNEL, RESET. (Selects the channel mode for display and resets to the first channel.)
8. Press the START/STOP button to initiate the step scan mode.
Upon the actuation of the START/STOP button in step 8, channel 1 is closed and the START/STOP LED is turned on. Channel 1 remains closed for two seconds (programmed inter­val rate) and then opens, The START/STOP LED turns off and the Model 705 advances to the next channel. To scan the remaining channels press START/STOP button each time a channel is to be scanned. When the last programmed channel is scanned, in this example, it goes through the same pro­cedure as previously stated. The difference is that after the channel opens up and turns off the START/STOP LED, the
Model 705 resets to the first programmed channel.
grammed last channel, at this point the Model 705 reverts to the programmed first channel and stops. Upon the actuation of the START/STOP button all the programmed channels are scanned at the programmed interval rate. For this example let us choose the following parameters:
1. First channel is 3.
2. Last channel is 15.
3. Interval time is 0.5 seconds.
4. Number of poles is 2.
5. Use the single scan mode.
Use the following procedure to program the Model 705 for the preceding parameters:
1. Install the desired scanner card into the Model 705. Refer to paragraph 2.2.2
2. Select appropriate line voltage and turn the Model 705 on. Refer to paragraphs 2.2.1 and 2.3 respectively.
3. Press PRGM, 6, 2, ENTER. For more complete details refer to paragraph 2.6.7.
4. Press 0, 3, FIRST. (Programs channel 3 as the first channel.)
5. Press 1, 5, LAST. (Programs channel 15 as the last channel.)
6. Press INTERVAL, 0, 0, 0, 5, 0, 0, ENTER (Programs the in­terval time for 0.5 seconds.)
7. Press CHANNEL, RESET. (Turns on the CHANNEL LED,
selects the channel mode for display and resets to the pro-
grammed first channel.)
8. Press SINGLE. (Selects the single scan mode and turns on
the SINGLE LED.)
9. Press the START/STOP button to inititate the single scan mode.
Upon the actuation of the START/STOP button in step 9, channel 3 is closed for 0.5 seconds (programmed interval rate and the START/STOP LED turns on). Channel 3 is opened and the Model 705 advances to the next channel. Channel 4 is closed for 0.5 seconds and then opens. The Model 705 then advances to channel 5 and the cycle repeats itself until the last channel is scanned (closed for the programmed interval rate and then opened). At the end of the scan of the last channel, the Model 705 resets to the programmed first channel and turns off the START/STOP LED. At this point the single mode has been completed.
Pressing the START/STOP button during a single scan stops the scan at the presently displayed channel. The channel re­mains closed and turns off the START/STOP LED. To start the scanning sequence from the presently displayed channel press the START/STOP button.
To stop the scanning sequence and reset the Model 705 to the programmed first channel simply press the RESET button.
Example 2 Single Scan-In the Single Scan mode all the channels are scanned one time. The Scan runs as follows: the first channel is closed for the programmed interval rate and then opened. The Model 705 advances to the next channel,
closes it for the programmed interval rate and then opens the
channel. The sequence is repeated up to and including the pro-
2-8
To stop the scanning sequence and reset the Model 705 to the programmed first channel simply press the RESET button.
Example 3 Continuous Scan-In the Continuous scan mode all the programmed channels are scanned continuously. The scan runs as follows: the first channel is closed for the pro­grammed interval rate and then opened. The Model 705 then advances to the next channel, closes it for the programmed in­terval rate and then opens the channel. The sequence is
repeated until the START/STOP button is pressed. Upon ac­tuation of the START/STOP button all the programmed chan­nels are scanned continuously at the programmed interval rate.
For this example choose the following parameters:
1. First channel is 5.
2. Last channel is 20.
3. Interval time is one second.
4. Number of poles is 2.
5. Use continuous scan mode.
Use the following procedure to program the Model 705 for the
preceding parameters:
I, Install the desired scanner card into the Model 705. Refer to
paragraph 2.2.2.
2. Select appropriate line voltage and turn the Model 705 on. Refer to paragraphs 2.2.1 and 2.3 respectively.
3. Press PRGM, 6, 2, ENTER. For more complete details refer
to paragraph 2.6.7.
4. Press 0, 5, FIRST. (Programs channel 5 as the first channel.)
5. Press 2, 0, LAST. (Programs channel 20 as the last
channel.)
6. Press INTERVAL, 0, 0, 1, 0, 0, 0, ENTER. (Programs the in-
terval time for one second.)
7. Press CHANNEL, RESET. (Turns on the channel LED, selects the channel mode for display and resets to the pro-
grammed first channel.)
8. Press CONTINUOUS. (Selects the continuous scan mode and turns on the continuous LED.)
9. Press the START/STOP button to initiate the continuous scan mode.
Upon the actuation of the START/STOP button in step 9, channel 5 is closed for one second (programmed interval rate) and the START/STOP LED turns on. Channel 5 is then open­ed and the Model 705 advances to the next channel. Channel 6 closes for one second and then opens. The Model 705 ad­vances to the next channel and the cycle repeats itself until the last channel is scanned (closed for the programmed interval
rate and then opened). At the end of the scan of the last chan-
nel, the Model 705 resets to the programmed first channel and then repeats the scanning sequence.
The scanning sequence can be stopped at any programmed channel by simply pressing the START/STOP button. Press-
ing the START/STOP button during a continuous scan stops the scan at the presently displayed channel, the channel re-
mains closed, and turns off the START/STOP LED. To start the scanning sequence from the presently displayed channel
press the START/STOP button, After the scanning sequence
has stopped, pressing the START/STOP button starts the
sequence from the presently displayed channel and turns on
the START/STOP LED.
channels. A total of five Model 705’s can be daisy chained together to increase the number of channels up to a maximum of 100. Each Model 705 has the capability to support the plug­in scanner cards. By daisy chaining the Model 705’s together, there is one instrument designated as the master while the rest of the Model 705’s are designated as slaves. The Model 705’s are designated either master or slaves by front panel Programs 91 and 92 respectively. For complete details concerning front panel programs refer to paragraph 2.6.
In this example the Model 705 will be programmed to scan 60 separate channels, Two additional Model 705 scanner main­frames are needed to implement this example. The three
Model 705’s must be daisy chained together in order to have the capability of the 60 2-pole channels. To daisy chain the
Model 705’s, refer to the circuit shown in Figure 2-3.
Each Model 705 will require two scanner cards in order to get the channels needed for this example. To simplify, use six
Model 7056 general purpose scanner cards and select the following parameters:
1. First channel is 1.
2. Last channel is 60.
3. Interval time is two seconds.
4. Number of poles is 2.
5. Use continuous scan mode.
Use the following procedure to program the Model 705 for the
preceding parameters:
1. Set up the circuit in Figure 2-3.
2. Install the plug-in scanner cards, two to each Model 705. Refer to paragraph 2.2.2 for installation instructions.
MODEL 705
CONTROL
MAINFRAME
SERIAL
IN
MODEL 705
r-r
To stop the scanning sequence and reset the Model 705 to the programmed first channel simply press the RESET button.
Example 4 Daisy Chaining-The Model 705 can be connect-
ed to other Model 705’s to increase the number of available
Figure 2-3. Daisy Chaining Three Model 705’s
2-9
3. Select appropriate line voltage and turn the Model 705’s on. Refer to paragraphs 2.2.1 and 2.3 respectively.
4. Press PRGM, 6, 2, ENTER. For complete details refer to paragraph 2.6.7.
5. Program one Model 705 as the master by initiating front
panel Program 91. For complete details concerning the
front panel programs refer to paragraph 2.6.
6. Program remaining Model 705’s as slaves by initiating front panel Program, 92 for each of the remaining Model 705’s.
To do this press PRGM button and then press 9, 2.
All remaining Model 705’s will have to be programmed in the same way. For complete details concerning the front panel programs refer to paragraph 2.6.
NOTE
Initiating front panel Program 92 locks up the
Model 705 front panel except for program 90 and 91 which allow you to go to stand alone or master. The following message is displayed while the front panel is locked up.
I i;Lf?UE I
I
7. Press 0, 1, FIRST. (Programs channel 1 as the first chan­nel.)
8. Press 6, 0, LAST. (Programs channel 60 as the last chan­nel.)
NOTE
If the Model 705’s are not daisy chained together, pressing 6, 0 in step 8 causes the Model 705 to
display the following message for approximately
0.5 seconds.
-1
The display message indicates that there is no channel 60.
9. Press INTERVAL, 0, 0, 2, 0, 0, 0, ENTER. (Programs the interval time for two seconds.)
10. Press CHANNEL, RESET. (Turns on the channel LED, selects the channel mode for display and resets the Model 705 to the programmed first channel.)
11. Press CONTINUOUS. (Selects the continuous scan mode and turns on the continuous LED.)
12. Press the START/STOP button to initiate the continuous scan mode.
Upon the actuation of the START/STOP button in step 12, the continuous scan sequence starts from the programmed first channel. The continuous scan mode operates in the same way as in Example 3. That is, the first channel is closed for the
programmed interval time and the START/STOP LED is turn­ed on; then the channel is opened, and the Model 705 ad­vances to the next channel. This sequence is repeated up to the last channel and then instead of advancing to the next channel the Model 705 resets to the programmed first channel and the entire sequence is repeated.
I
The scanning sequence can be stopped at any programmed channel by simply pressing the START/STOP button. Press­ing the START/STOP button during a continuous scan stops the scan at the presently displayed channel, the channel re­mains closed, and turns off the START/STOP LED. To start
the scanning sequence from the presently displayed channel,
press the START/STOP button. The START/STOP LED
turns on when resuming the scan,
To stop the scanning sequence, and reset the Model 705 to the programmed first channel,simply press the RESET button.
Example 5 Temperature Scan-With the Model 7057 ther­mocouple plug in card, the Model 705 can scan separate temp­erature points. The Model 7057 thermocouple scanner card is field installable in the Model 705 Scanner mainframe. Since the Model 7057 combines the functions of a thermocouple scan­ner and uniform temperature reference it is especially useful for scanning thermocouples. The input terminals are #lO alloy­copper set in an isothermal block to minimize temperature dif-
ferences. A thermistor sensor within the isothermal block is
used with a bridge network located on the Model 7057 to give an indication of the temperature reference or cold junction.
The temperature of the heat sink is used to calculate the cor-
rected thermocouple output. The output voltages of each ther­mocouple must be converted to temperature (OC or OF) using
appropriate thermocouple tables or polynomial equations. In-
put and output connections are made through the rear panel of
the Model 705 Scanner mainframe using #4 screw terminals on the Model 7057. For complete details concerning the Model 7057 thermocouple scanner card refer to the Model 7057 In­struction Manual.
In this example, the Model 705 will be programmed to scan
five separate temperatures. Also, the following parameters will
be programmed into the Model 705. I. First channel is 1.
2. Last channel is 6.
3. Number of poles is 2.
4. Interval time is three seconds,
5. Use the continuous scan mode.
Use the following procedure to program the Model 705 for this
example:
1. If Example 4 is still set up, disconnect it. Connect the five temperature sources to the Model 7057 via the #4 screw terminals at the rear of the card.
2. Install the Model 7057 into the Model 705 Scanner main­frame. Refer to paragraph 2.2.2 for scanner card installa­tion instructions.
3. Select appropriate line voltage and turn on the Model 705. Refer to paragraphs 2.2.1 and 2.3 respectively.
4. Press PRGM, 6, 2, ENTER. For complete details concern­ing front panel programs refer to paragraph 2.6.
5. Press 0, 1, FIRST. (Programs channel 1 as the first chan­nel.) Channel 1 is used to monitor the temperature of the input terminals with the thermistor bridge.
6. Press 0, 6, LAST, (Programs channel 6 as the last channel.)
2-10
7. Press INTERVAL, 0, 0, 3, 0, 0, 0, ENTER. (Programs the interval time for three seconds.)
8. Press CHANNEL, RESET. (Turns on the CHANNEL LED, selects the channel mode for display and resets the Model 705 to the programmed first channel.)
9. Press CONTINUOUS. (Selects the continuous scan mode and turns on the CONTINUOUS LED.)
10. Press START/STOP. (Initiates the continuous scan mode and turns on the START/STOP LED.)
As in the previous examples, the scanning sequence can be stopped at any programmed channel by pressing the START/STOP button. Pressing the START/STOP button during a continuous scan stops the scan at the presently displayed channel, the channel remains closed, and turns off the START/STOP LED. To resume the scanning sequence
from the presently displayed channel, press the START/STOP
button. The START/STOP LED turns on when resuming the
scan.
To stop the scanning sequence and reset the Model 705 to the
programmed first channel, simply press the RESET button.
NOTE
The output voltages of each thermocouple on the
Model 7057 must be converted to temperature (OC or OF) using the appropriate thermocouple
tables or polynomial equations, Consult the
Model 7057 Instruction Manual for more informa-
tion concerning the thermocouple tables and/or
polynomial equations,
Example 6 Low Current Scan-With the Model 7058 install­ed, the Model 705 is capable of scanning currents in the range of picoamps. The Model 7058 is a low current scanner plug-in card which is field installable in the Model 705 Scanner main­frame. The card is capable of switching up to 10 channels. The Model 7058 is designed to introduce a minimum of offset cur­rent (< IpA), while guarding ensures that high isolation (101%) is maintained between input signals. Triaxial input and output connections to the scanner are located at the rear of the card.
grammed to scan five separate low current sources. Also, the
following parameters will be programmed into the Model 705.
1. First channel is 1.
2. Last channel is 5.
3. Interval time is 2 seconds.
4. Use the single scan mode.
Use the following procedure to program the Model 705 for this
example:
1.
Assume that there are the five low current sources to be scanned. Connect the five low current sources to the Model 7058 via the triax connectors.
2. Install the Model 7058 into the Model 705 Scanner main­frame. Refer to paragraph 2.2.2 for scanner card installation instructions.
3.
Select appropriate line voltage and turn on the Model 705.
Refer to paragraphs 2.2.1 and 2.3 respectively.
4.
Press 0, 1, FIRST. (Programs channel 1 as the first channel. 1
5.
Press 0, 5, LAST. (Programs channel 5 as the last channel.)
6.
Press INTERVAL, 0, 0, 2, 0, 0, 0, ENTER. (Programs the in­terval time for two seconds.)
7.
Press CHANNEL, RESET. (Turns on the channel LED,
selects the channel mode for display and resets the Model 705 to the programmed first channel.)
8.
Press SINGLE. (Selects the single scan mode and turns on
the SINGLE LED.)
9.
Press START/STOP. (Initiates the single scan mode and
turns on the START/STOP LED.)
Upon actuation of step 9 the Model 705 scans through the pro­grammed channels at the programmed interval rate one time. As in the previous examples the scanning sequence can be stopped at any programmed channel by simply pressing the START/STOP button. Pressing the START/STOP button during a scan stops the sequence at the presently displayed channel, the channel remains closed, and turns off the CHAN­NEL LED. To resume the scanning sequence from the present­ly displayed channel, press the START/STOP button. The START/STOP LED turns on when resuming the scan.
The actual measurement of the low current should be done with a high quality electrometer such as the Keithley Model 614 or Model 619. A good quality picoammeter could also be used such as the Keithley Model 480. All three of these instruments are capable of measuring in the range of picoamps with high accuracy. To measure such low currents a number of measurement parameters must be taken into consideration (in­put impedance, measurement configuration etc,). While this example does not attempt to give instructions on measuring low current, the instruction manual provided with each of previously mentioned electrometer and picoammeter gives step by step instructions on how to measure low currents ac­curately.
For detailed information concerning the Model 7058, refer to the Model 7058 Instruction Manual, document number 7058-901-OIA. In this example, the Model 705 will be pro-
To stop the scanning sequence reset the Model 705 to the pro-
grammed first channel, simply press the RESET button.
The interval time programmed into the Model 705 for this ex­ample was chosen at random. The interval time can easily be
programmed for a much longer or much shorter time. General­ly, the interval time should be sufficient to allow the measure­ment to settle. The parameters that dictate how long the measurement needs to settle include source resistance, input impedance, measurement configuration etc. Consult the low current measuring devices’s instruction manual for details con­cerning these measurement parameters.
Example 7 Low Voltage Scan-With the Model 7059 install­ed, the Model 705 is capable of scanning voltage in the sub­millivolt region. The Model 7059 is low voltage plug-in scanner
2-l 1
card which is field installable in the Model 705 Scanner main­frame. The card is capable of switching up to 10 channels. For low level tranducer and thermocouple output switching, the Model 7059 is designed to introduce a minimum of thermal voltage error ( ( IpV input to output with copper leads) and en­sure that high isolation (lOl*D) is maintained between input
signals. Quick disconnect screw terminals are used to facilitate
input and output connections to the scanner plug-in card.
The actual measurement of the low voltage should be done with a high quality microvoltmeter such as the Keithley Model
177 or the Model 181 digital nanovoltmeter. These instruments are capable of measuring in the range of microvolts with high accuracy. To measure such low voltage a number of measur-
ment parameters must be taken into consideration. The meas-
urement parameters include source resistance, thermal emf’s
ground loops etc. While this example does not attempt to educate the user in low voltage measurements, the instruction
manual provided with each of the previously mentioned in­struments gives step by step instructions on how to measure
low voltage accurately.
For detailed information concerning the Model 7059, refer to the Model 7059 Instruction Manual, document number 7059-901-Ol A. In this example, it will be assumed that the user needs to scan five separate voltage sources, Also, the follow­ing parameters will be programmed into the Model 705.
1. First channel is 1.
2. Last channel is 5.
3. Interval time is one second.
4. Use the single scan mode. Use the following procedure to program the Model 705 for this
example:
1. Assume that there are five low voltage sources to be scann-
ed. Connect the five low voltage sources to the Model 7059 via the quick disconnect screw terminals located on the card.
2. Install the Model 7059 into the Model 705 Scanner main­frame. Refer to paragraph 2.2.2 for scanner card installation
instructions.
3. Select the appropriate line voltage and turn on the Model
705. Refer to paragraphs 2.2.1 and 2.3 respectively.
4. Press 0, 1, FIRST. (Programs channel 1 as the first
channel.)
5. Press 0, 5, LAST. (Programs channel 5 as the last channel).)
6. Press INTERVAL, O,O, 1, 0, 0, 0, ENTER. (Programs the in-
terval time for one second.)
7. Press CHANNEL, RESET. (Turns on the CHANNEL LED,
selects the channel mode for display and resets the Model 705 to the programmed first channel.)
8. Press SINGLE. (Selects the singl’e scan mode and turns on
the SINGLE LED.)
9. Press START/STOP. (Initiates the single scan mode and
turns on the START/STOP LED.)
Upon actuation of step 9 the Model 705 scans through the pro-
grammed channel at the programmed interval rate one time. As in the previous examples, the scanning sequence can be stopped at any programmed channel by simply pressing the
START/STOP button. Pressing the START/STOP button during a scan stops the sequence at the presently displayed channel, the channel remains closed, and turns off the CHAN­NEL LED. To resume the scanning sequence from the present­ly displayed channel, press the START/STOP button. The START/STOP LED turns on when resuming the scan.
To stop the scanning sequence and reset the Model 705 to the programmed first channel, simply press the RESET button.
The parameters that were programmed into the Model 705 for this example were chosen at random. The parameters can be easily changed to suit the particular measurement and/or scanning configuration at hand by reprogramming the Model
705.
OPERATING THE CLOCK
The CLOCK group on the Front Panel contains the TIME and DATE buttons. The clock continues to run after the Model 705 is powered down. This is because the clock’s power circuitry is backed up by battery BTlOl . The time is displayed in a 24 hour display, refer to paragraph 2.5.2 step 6 for time display format. The date is displayed in one of two formats (See paragraph
2.5.2 step 6). To display the time mode simply press the TIME button. To set the time, use the following procedure:
1. Press TIME (selects the time mode for display and turns on the time LED).
2. Press the DATA buttons (O-9) that correspond to the desired time: For example, to set the time of 7:30 A.M. press 0, 7, 3, 0, 0, 0, ENTER.
Upon the actuation of the ENTER button, the time is set to
7:30 AM. As another example, set the time to 7:30 PM by
pressing 1, 9, 3, 0, 0, 0, ENTER.
To display the DATE mode, simply press the DATE button. The date, as mentioned before, is displayed in one of two for­mats. The formats are the American date format and the Inter­national date format. These formats are depicted in paragraph
2.5.2 step 6. The formats are selected exclusively by front
panel program 1. Refer to paragraph 2.6 for complete details on the front panel programs.
1. Press DATE. (Selects the date mode for display and turns on the DATE LED.)
2. Press the DATA buttons (O-9) that correspond to the desired date. For example, set the date to August 18th for the American date format by pressing: A. PRGM, 1. (Selects front panel Program 1 for display.)
9. 0, ENTER. (Selects the American date format.) C. 0, 8, 1,8, ENTER. (Enters 08.18 for the date August 18.)
Another example, set the date to August 18th for the Interna­tional date format by pressing:
1. PRGM, 1. (Selects front panel Program 1 for display.)
2. 1, ENTER. (Selects the International date format.)
3. 1, 8, 0, 8, ENTER. (Enters 18.08 for the date August 18.)
2-12
2.6 FRONT PANEL PROGRAMS
This section contains instructions necessary for operating the
13 internal programs of the Model 705. The programs are ac-
tivated by pressing the PRGM button along with the button
representing the appropriate program number. The programs
do a number of various tasks which are summarized in Table
2-3.
8. If too many digits are entered, the display begins again at
the first digit on the left, All the digits in the constant must then be entered again. This applies only to Programs 0,2,3, 6 and 7.
9. Once all the digits of the desired constants are shown on the
display, the constant is entered into the program by pressing the ENTER button. This applies only to Programs 0, 1, 2, 3, 4, 5, 6 and 7.
Program Notes
1. Each program is entered by pressing the PRGM button followed by the desired program number.
2. Pressing the PRGM button selects the program mode and displays the following:
j
As you have noticed, the question mark is flashing. This is
prompting the operator to enter the desired program number (refer to Table 2-3). After entering the program number the Model 705 goes into the program and then pro­mpts the operator to enter numerical data. Numerical data
varies with each program.
3. New programs may be entered without clearing a program that is presently running. To do so, press the PRGM button followed by the desired program number.
4. Data is entered into the digit whose “c” segment is flashing by pressing the desired number button. The “c” segment of a display digit is shown below:
I3
w’c” segment
As each digit is entered, the blinking segment moves one place to the right until all the necessary digits have been entered.
5. Only as many significant digits as necessary need to be entered. The Model 705 will complete the constants with trailing zeroes where necessary.
6. Invalid keys will be ignored. If an invalid key is pressed the blinking “c” segment remains at the current digit.
7. If an incorrect digit is entered, the complete constant must be re-entered. The new value may be entered by cycling the display around to the beginning by repeatedly pressing one of the number buttons.
Table 2-3. Summary of Front Panel Programs
Vogram Operation
0 Digital I/O (Input/Output)
1 2 Settling Time 3 Set Primary Address 4
5 Recall Stored Relay Set Up 6 Pole Configuration (I, 2 or 4) 7 Set Alarm 8 Self Test
90 Stand Alone Instrument 91 Master 92 Slave 99 Reset
American/International Date Forma.
Save Present Relay Set Up
1 1
t
2.6.1 Program 0 Digital l/O
Program 0 allows the user to control the outputs on the digital I/O port. The I/O port is located on the rear panel of the Model
705. The output code is displayed in base eight (octal) on the front panel. The actual I/O port output data is in 8 bit form. The range of octal data that can be entered on the front panel is 0 to 377. The maximum octal data is 377 which corresponds to 11111111 in BCD. If the front panel data is entered as 377 then the digital I/O output data is 11111111. To initiate Pro­gram 0 use the following procedure:
1. Press PRGM and the following is displayed:
1 Pro ? j
2. Press 0 and the following is displayed for approximately 0.5 seconds:
I uut II-I
After the out in message is displayed, the Model 705 displays the following:
uuuobol
Where the first three digits represent the digital output (in octal) and the last three digits represent the digital inputs (in octal).
NOTE
The digital I/O inputs are defined by the connec­tions on the input pins. With no connections on the input pins the inputs are undefined. The digital I/O outputs are programmed by using Pro­gram 0.
3. Press 0, 7, 7, ENTER. (Programs the output bits on the digital I/O port for 00111111.)
2.6.2 Program 1 Date Format
Program 1 is used to select one of two date formats. The two formats are the American date format and the International date format. They are displayed as follows: American - mm.dd where mm = month dd = day
Internation-dd.mm
To enable Program 1 and select the international date format
use the following procedure:
1. Press PRGM. (Selects program mode and displays Pro ?I.
2-13
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