Keithley 7066 User manual

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Model 7066 Relay Switch Card
Instruction Manual
Contains Operating and Servicing Information
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Model 7066 Relay Switch Card
Instruction Manual
01986, Keithley Instruments, Inc.
Test Instrumentation Group
All rights reserved.
Cleveland, Ohio, U.S.A.
Februaty 1990, Second Printing
Document Number: 7066-901-01 Rev. B
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SafetyPrecautions
The following safety precautioos should be obsewed before using this product and any asno-
ciated instrumcntatioo. Although some inrtromeots and accessories woold nonnally bo used
with nowhazardous voltages, there arc situations wberc hazardous conditions may be present.
This product is intended for use by qualified personnel who rccogoiu: shock hazards and are
familiar with tbc safety pnxaotions rcqoircd to avoid possible injuly. Read lbe operating it]-
formation carefully before using the product.
‘The types of product users arc:
Kesponsiblc body is tbe iodividunl or group responsible for the USCsod owinleoaoce of
equipment, for ensuring tlnt the equipment ia operated within its spccilications and operat-
ing limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. Tbey most be trained in electrical safety
procedures and proper use of the iostrument. ‘lhey most be protected from electric shock and
~onmt with hazardous live circuits.
Maintenance personnel perform mutioe procedures oo the product to keep it operadog, for
example, setting the hoc voltage or replacing consumable materials. Maintenance proccdurcs
am dcacribed in the manual. The procedures explicitly state if the operator ~nay perform them.
Othcrwisc, they should be performed only by senice pcnonoel.
Service personnel are trained to work on live circuits, sod perfoonn safe installations sod re-
pairs of products. Ooly properly trained setvice personocl may perform installation and scr-
vice procedures.
Exercise extreme caution whco a shock hazard is present. Lethal voltage may be present on
cable coonector jacks or test fixtures. 111~American National Standards lostitute (ANSI)
stam that a shock hazard exists wheo voltage levels greater than 30V RMS, 42.4V peak, or
60VDC are present. A good safety practice is to expect that hazardous voltage is present
in any unknown circuit before measuring.
Users of this product must be protected fmm electric shock at all timer. The responsible body
must eosum thtatwets aw pwented a.cce~saod/orinsulatcd from every connection point. lo some
cases, conoectiuns most be exposed to potential buman cootact. Product usa io these circuo-
stances must be trained to protect themselves from the risk of electric shock. If the circuit is ca-
pable of operating at or abovc 1wO volts, no conductive part of the circuit may be exposed.
AY described in the Ioteroational Electratechnical Commission (IEC) Standard IEC 664, dig-
ital multimcter measuring circuits (e.g., Keifhley Models 175A, 199, 2OOQ,2COl, 2002, and
2010) are Installation Category II. All other instruments signal tennioals are Installation Cat-
egory I and must oat be conoected to mains.
Do not conoect switching cards directly to unlimited power circuits. They are inlendcd to bc
used with impedance limited sources. NEVER connect switching cards directly to AC mains.
Wheo conoccting sources to switching cards. iostall protective devices to limit fault current
sod voltage to tbc card.
Before operating ao instrument, make sure the line cord is connected to a properly grounded
power receptacle. Inspect the connecting cables, test leads, and jumpers for possible wear,
cracks, or breaks bcforc each oso.
For maximum safety, do not touch the product, test cables, or any other instrumcots while pow-
er is applied to the circuit under test. ALWAYS remove power from the entire test system sod
dischuge soy capxitors before: coooccting or disconnecting cables or jumpers, installing 01
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removing switching cards. or making iotemtil chaogcs, socb as installing or nzmoviog jumpers.
Vu not touch soy object that could provide a con-cot path to tbc common side of the circuit
under test or power line (eatth) ground. Always make measurements witb dry hands while
standing oo a dly, insulated surface capable of withstanding tbc voltage bciog measured.
The instrument and accessories most be used in accordance with its specifications and op-
eratiog iostructioos or tbe safety of the equipment may be impaired.
Do not exceed the maximum signal levels of the instruments and accessories. as defined in
tbe speciticationr sod operatiog information, and es show on the instrument or test fixture
panels, or switcbiog cant.
When fores are used in a product, replace with same type sod rntiog forcootioued pmtectioo
against fire hazard.
Cbassir connections must only be used as shield coooectioos for me~suriog circoits, NOT as
safety eaflh ground connections.
If you are using II test fixture, keep the lid closed while power is applied to the device under
test. Safe operation requires tbe we of a lid interlock.
1ra@ screw is present, connect it to safety earth ground uaiog the wire recommended in
the user documentation.
The ! symbol on an iostroment indicates that the user should refer to the operating ill-
n
stmctions located io tbc manual.
The h symbol on al iostmment shows that it CNI source or IIICRIIUII: loo0 volts or more, ill-
eluding the combined etTect of normal ad common mode voltages. Use stiuldarrl safety precau-
lions to avoid pcrsooal cootect with these voltages.
TIE WARNING beading in Amanual enplaios dangers that might result in personal injury or
death. Always read the associated information wy carefully hcfore ptxformiog the indicated
pC"CCdU~C.
The CAUTION beading in a manual explains hazards that could damage the instrument.
Such damage may invalidate the warrmty.
lostrumcntatioo and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain pmtcctioo from electric shock and ftre, replacement components in mains cir-
coils, including the power transfouner, test leads, and ioput jacks, must he purchased from
Keithley Instruments. Standard fuses, with applicable national safety appmvals, may be used
if the ratiog sod type are the same. Other components that are not safety r&ted may hc por-
chased from other suppliers as long as they are equivalent to tbe original component. (Note
that selected parts should be purchased only through Keithley Iostmmcnts to maiotain acco-
racy sod fonctiooality of the product.) If you we unsure about the applicability of a replacc-
ment component, call a Keithlcy Instruments office for information.
To clean an instrument. use a damp cloth or mild, water based cleaner. Clean the exterior
of the instrument only. Do not apply cleaner directly tb the instrument or allow liquids to
enter or spill on the instrument. Products that consist of a circuit hoard with no case or cbas-
sis (e.g., data acquisition board for installation into a computer) should neverrequire clean-
ing if handled according to instructiuns. If the board becomes contaminated sod operation
is affected. the hoard should he returned to the factory for proper cleaninglserviciog.
tie”. 2rB
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SPECIFICATIONS
MODEL 7066RELAY SWITCH CARD
CHANNELS PER CARD: 10
CONTACT CONFIGURATION: 2-p&, Form A or Pam B (jumper selectable).
CONNECTOR TYPE: Quick disconnect screw terminals, No. 14AWG maximum wire size.
RELAY DRIVE CURRENT: SOmA per relay typical.
MAXIMUM SIGNAL LEVEL: 250, DC or RMS, 350V peak. 2A DC or RMS. 6UWDC,
125VA AC (resistive load).
CONTAff LIFE: IO’ closures (cold switching); 10”closures (at maximum signal level).
CONTACT RESISTANCE: <O.lll initial, ~20 to rated life.
CONTACT PmENTIAL: <3OpV per contad pair, input to output with copper leads
(< 1OpVtypical).
ACTUATld~ TIME: <3ms, exclusive of mainframe.
CHANNEL ISOLATION: >lO%
INPUT ISOLATION: >lOY,
COMMON MODE VOLTAGE: 350V peak.
ENVIRONMENT,
Operating: O” to WC, up to 35T at 70% R.H.
storage: -25” to 65°C.
DIMENSIONS, WEIGHT: 32mm high x 114mmwide x 272mm long (1%” x 4l/z” x
10%“). Net weight 0.2Bkg (IO oz.).
EACHCHANNEL:
Provides 10channels of 2-p& switching, with a quick disconnect terminal block for each
channel.
Configuration is DPST-N.O. (IYxm A). Normally c&cd connection is available by
ln”“i”g jumpers.
Specifications subject to change without notice.
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TABLE OF CONTENTS
SECTION l-GENERAL INFORMATION
I.‘1 INTRODUCTION ............................ l-1
1.1.1 Product Description. ........................ I-I
1.1.2 Manual Overview .......................... l-1
I.3 MANUAL A
I .4 SAFETY SYMBOLS AN
1.5 UNPACKING AND IN:
I.2 WARRANTY INFORMATION ................. I-2
DDENDA ........................ I-2
D TERMS ............. l-2
PECTION ............. l-3
SECTION 2-OPERATION
2.1 INTRODUCTION ............................ 2-I
2.2 SAFETY PRECAUTIONS ...................... 2-l
2.3 WIRING .................................... 2-I
2.3.1 NO and NC Jumpers ....................... 2-3
2.3.2 DI’ST Configuration ....................... 2-3
2.3.3 Terminal Block Configuration. ............... 2-5
2.3.4 Other Configurations .............. :. ....... 2-K
2.4 INSTALLATION AND REMOVAL ............. 2.12
2.4.1 Relay Card Installation ...................... 2-13
2.4.2 Relay Card Removal ....................... 2-13
2.5 OPERATION ................................ 2-13
2.6 TYPICAL AI’PLICATIONS ................... 2-23
2.6.1 Switching Sources and Supplies. ........... 2-23
2.6.2 Switching Loads .......................... 2-24
2.6.3 Other Applications ........................ 2-25
SECTION 3--SERVICING INFORMATION
3.1 INTRODUCTION ............................ 3-I
3.2 REQUIRED TEST EQUIPMENT ............... 3-l
3.3 ENVIRONMENTAL CONDITIONS ............ 3-I
3.4 VERIFICATION PROCEDURE ................. 3-2
SECTION 4-REPLACEABLE PARTS
4.1 INTRODUCTION ............................ 4-I
4.2 REPLACEABLE PARTS ....................... 4-l
4.3
4.4
4.5
ORDERING INFORMATION. 4-l
FACTORY SERVICE 4-l
COMPONENT LAYOUT and SCHEMATIC
DIAGRAM 4-2
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LIST OF TABLES
SECTION 2-OPERATION
2-l Four-Pole Jumper Configuration 2-11
2-2 Scanner Control of Model 7066 4-Pole Mode 2-16
2-3 Scanner Control of Model 7066 2.Pole Mode 2-16
2-4 Scanner Control of Model 7066 l-Pole Mode 2-17
2-5 Scanner Control of Model 7066 Matrix Mode
(O-Pole) 2.19
SECTION 3-SERVICING INFORMATION
3-l Recommended Test Equipment 3-l
SECTION 4--REPLACEABLE PARTS
4-l Model 7066, Parts List . 4-2
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SECTION 2-OPERATION
2-l Jumper Positions for NO and NC Operation ... 2-4
2-2 DUST Configuration .......................... 2-5
2-3 Quick Disconnect Terminal Block .............. 2-6
2-4 Typical Wire Routing ............... : ......... 2-7
2-5 SPIYK Configuration, ......................... 2-8
2-6 DPDT Configuration ......................... 2-10
2-7 4PST Configuration. ......................... 2-12
2-8 Limiting Inductive Reaction Voltage ........... 2-21
2-9 Limiting Capacitive Reaction Current ......... 2-22
2-10 Clamping AC Mains Transients, .............. 2-23
2-11 Switching Sources and Supplies ............. 2-24
2-12 Switching Loads ............................ 2-25
$ECTlON 3-SERVICING INFORMATION
3-l Performance Verification Setup ................ 3-3
SECTION 4-REPLACEABLE PARTS
4-l Model 7066, Component Location Drawing ..... 4-3
4-2 Model 7066, Schematic Diagram ............... 4-5
ill
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SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
1.1.1 Product Description
The Model 7066 Relay Switch Card provides 10 separate channels
using 10 two-pole relays. As shipped, the switches are configured
for double-pole single-throw (DPST), normally open (NO) opera-
tion. Features of the relay switch card include:
l Quick disconnect terminal blocks for each channel.
l Moveable relay jumpers to configure any switch to be normally
closed (NC).
l Separate, isolated IN/OUT circuits for each channel.
1.1.2 Manual Overview
The instruction manual is organized in the following manner:
l Section 1 General Information-Includes a product description
and an overview of the manual, information on warranty,
manual addenda, safety symbols and terms, unpacking and in-
spection, and specifications.
l Section 2 Operation-Includes safety information, wiring and
installation, operating instructions, and some typical
applications.
l Section 3 Performance Verification-Provides the procedure to
check proper operation of the card.
l Section 4 Replaceable Parts-Includes a parts list, schematic
diagram and a component layout.
l-1
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1.2 WARRANTY INFORMATION
Warranty information is stated on the inside front cover of this
manual. If there is a need for service, contact the Keithley
representative or authorized repair facility in your area. Check the
back cover for addresses. The service form supplied at the end
of the manual should be used to provide the service facility with
information concerning any difficulty.
1.3 MANUAL ADDENDA
Product improvements or changes to this manual will be explained
on an addendum included with the manual. It is recommended
that this information be incorporated immediately into the ap-
propriate places in the manual.
If an additional instruction manual is required, order the manual
package (Keithley Part Number 7066-901-00). The manual package
includes an instruction manual and all pertinent addenda.
1.4 SAFETY SYMBOLS AND TERMS
The symbol A denotes that the user should refer to the
operating instructions.
The symbol A#
the terminal(s). denotes that a high voltage may be present on
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.
1-2
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1.5 UNPACKING AND INSPECTION
The Model 7066 was inspected both electrically and mechanically
before shipment. Upon receiving the Model 7066, unpack all items
from the shipping carton and check for any obvious damage that
may have occurred during transit. Report any damage to the ship-
ping agent. Retain and use the original packaging materials in case
reshipment is necessary. The following items are shipped with
every Model 7066:
Model 7066 Relay Switch Card
Model 7066 Instruction Manual
1.6 SPECIFICATIONS
Detailed specifications of the Model 7066 precede the table of con-
tents of this manual.
l-31-4
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SECTION 2
OPERATION
2.1 INTRODUCTION
This section contains safety information, wiring instructions for
the various relay configurations, an installation procedure of the
card in a scanner, operating instructions, and some typical ap-
plications for the card.
2.2 SAFETY PRECAUTIONS
1. Make sure the scanner mainframe is grounded through a pro-
perly earth grounded receptacle before operation.
2. Inspect all test lead connections for wear and defects such as
cracks, exposed wires, (etc). Correct any defect found before
operating the relay card with the mainframe.
3. Do not exceed the Model 7066’s maximum allowable voltages
as defined in the specifications.
4. Turn off all power supplies and discharge any residual power
before installing or removing the Model 7066 from the scanner
mainframe.
5. Turn off all power supplies and discharge any residual power
before connecting or disconnecting wires and jumpers from the
Model 7066.
6. The Model 7066 is not intended to directly switch high power
mains circuitry. Stiitching low power mains circuitry is ex-
plained in paragraph 2-5.
2.3 WIRING
Each channel on the Model 7066 consists of a two-pole relay that
has a quick disconnect terminal block. As shipped, each relay is
configured for double-pole single-throw (DPST), normally open
(NO) operation. The relay card can be wired for different switch
configurations as explained in this section.
2-1
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WARNING
To avoid electrlcal shock that could result In severe ln-
jury or death, always remove all power from external
sources before making or breaking connections to the
relay card.
CAUTION
When switching a circuit that approaches the current
limit (2A) or a circuit with high fault current capablllty
(such as AC mains), it is required that a 2A fuse be
wired In series with the input to protect the card.
Peak transients must be clamped to <4OOV. See
paragraph 2.5 for clamping information.
Notes:
1. To maintain >lO’O input isolation, keep the card and terminal
blocks clean. Body oil and dirt from touching can degrade the
isolation resistance.
2. To prevent overheating, do not place loads on the card. All loads
should be outside of fhe scanner.
3. Shielding-Shielded cables should be used when switching
above 50V or high current. The shield should be connected
preferably to a guard circuit or to earth ground. This helps pre-
vent excessive radiation from the cables from interfering with
any equipment. The cable rating must exceed the maximum
allowable signal levels as defined in the specifications.
4. RF1 Filtering-RF1 on inputs or outputs may cause problems
with other cards installed in the scanner and with low level
measurements. RF1 filtering on these lines may be required in
order to operate the cards to their full specifications.
5. Reactive loads require voltage clamping (for inductive loads) and
current limiting (for capacitive loads). See paragraph 2.5 for
more information.
2-2
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2.3.1 NO and NC Jumpers
At the factory, both poles of each relay are configured for normal-
ly open (NO) operation. That is, the circuit is not closed until the
relay is energized. The positions of the jumpers for NO opera-
tion are shown in Figure 2-1(A).
A pole of any relay channel can be configured to be normally
closed (NC) by moving the jumper to the alternate position. In
the NC configuration, the circuit is broken when the relay is
energized. Figure 2-1(B) shows the position of the jumpers for con-
figuring both poles of a relay for NC operation.
2.3.2 DPST Configuratlon
To use a channel in the double-pole single-throw (DPST) con-
figuration, simply connect the source to the IN terminals of the
terminal block and the load across the OUT terminals as shown
in Figure 2-2. The procedure to make connections to the terminal
block is provided in the next paragraph.
NOTE
The DPST configuration can be changed to a SPST con-
figuration by connecting one of the loads to common.
Thus, one pole of the relay is not used in that circuit.
2-3
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HLHL
OUT IN
A. BOTH POLES
NORHALLY OPEN (NO)
JUT LOd ,
HI @
HLHL
OUT IN
, BOTH POLES
NORMALLYCLOSED (NC :
Figure 2-1. Jumper Positions for NO and NC Operation
2-4
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A. NORMALLYOPEN ( NO)
1
L
8. NORMALLYCLOSED (NC )
Figure 2-2. DPST Configuration
.OAD
2.3.3 Terminal Block Connections
Perform the following procedure to wire circuitry to the terminal
blocks of the Model 7066:
WARNING
Make sure all power is off end stored energy in exter-
nal circuitry Is discharged.
2-5
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1. Remove the terminal block, for the appropriate channel, from
the relay card by simply pulling it off the PC board.
2. Using an insulated screwdriver, connect the circuitry to the ter-
minal block as shown in Figure 2-3. The screw terminals accept
#14 to ,426 AWG wire.
3. Reinstall the terminal block on the relay card. Make sure the
pins on the card are properly mated to the terminal block.
4. Repeat steps 1 through 3 if it is desired to wire additional ter-
minal blocks.
5. Referring to Figure 2-4, remove one screw from the cable clamp
of the relay card and route the terminal block wires as shown.
6. Reassemble and tighten the cable clamp. The clamp serves as
a strain relief for the terminal block wires.
NOTE
To order extra terminal blocks, order Keithley part number
CS-521-3. See paragraph 4.3 for ordering information.
Figure 2-3. Quick Disconnect Terminal Block
2-6
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Figure 2-4. -pical Wire Routing
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