Model 7169 General Purpose Scanner Card
Instruction Manual
Contains Operating and Servicing Information
WARRANTY
LIMITATION OF WARRANTY
STATEMENT OF CALIBRATION
Model 7169
General Purpose Scanner Card
Instruction Manual
01989, Keithley Instruments, Inc.
All rights reserved.
Cteveland, Ohio, U.S.A.
First Printing, July 1989
Document Number: 716Y-901.01 Rev. A
All Keithley product names are trademarks or registered trade,
marks of Keithley Instruments, Inc.
Other brand and product names are trademarks or registered
trademarks of their respective holders.
SAFETY PRECAUTIONS
The following safety precautions should be observed before using the
Model 7169 and the associated instruments.
This card is intended for use by qualified personnel who recognize
shock hazards and are familiar with the safety precautions required to
avoid possible injury. Read over this manual carefully before using the
card.
Exercise extreme caution when a shock hazard is present at the test circuit. User-supplied lethal voltages may be present 011 the PC board. The
American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS or 42.4V peak are
present. A good safety practice is to expect that hazardous voltage is
present in any unknown circuit before measuring.
Do not exceed500V peak between any two pins or between any pin and
earth ground.
Inspect the connecting cables and test leads for possible wear, cracks, or
breaks before each use.
For maximum safety, do not touch the test cables or any instruments
while power is applied to the circuit under test. Turn off the power and
discharge any capacitors before connecting or disconnecting cables
from the card.
Do not touch any object which could provide a current path to the common side of the circuit under test or power line (earth) ground. Always
make measurements with dry hands while standing on a dry, insulated
surface capable of withstanding the voltage being measured.
Do not exceed the maximum signal levels of the card, as defined in the
specifications and operation section of this manual.
Model 7169 20 Form C Switch Card
CHANNELS PER CARD: 2.0 independent Form C. All poles available
at connectors. Replacement of factory installed jumper allows
current limit resistor in series with common of each channel. Oncard bus allows for addition of jumper to change configuration from
switch to multiplex. Bus also allows channel interconnection.
CONNECTOR TYPE: 3 x 20 pin mass termination.
RELAY DRIVE CURRENT: 3OmA per relay typical.
MAXIMUM SIGNAL LEVEL: 500V peak, 0.5A rms switched, 1A rms
carry, 1OW (resistive load only).
CONTACT LIFE: >108 closures cold switching; >107 closures at
maximum signal levels.
CONTACT RESISTANCE: <2Q to rated life.
CONTACT POTENTIAL: <3OkV, C to NO or NC.
ACTUATION TIME: <lmsec., exclusive of mainframe.
CHANNEL ISOLATION: >109Q, <150pF.
INPUT ISOLATION: >lOgQ <150pF.
COMMON MODE VOLTAGE: 500V peak.
OPERATING ENVIRONMENT: 0” to 55”C, up to 35°C at 70% RH.
STORAGE ENVIRONMENT: -25’ to 65°C.
DIMENSIONS, WEIGHT: 32mm high x 114mm wide x 272mm long
(1.25 in. x 4.5 in. x 10.75 in.). Net weight 0.54 kg (19 oz.).
Specifications subject to change without notice.
Table of Contents
SECTION 1
- General Information
1.1
INTRODUCTION
1.2
WARRANTYINFORMATION
1.3
MANUAL ADDENDA
1.4 SAFETY SYMBOLS AND TERMS
1.5
SPECIFICATIONS
1.6
UNPACKING AND INSPECTION
1.6.1
Inspection for Damage
1.6.2
shipping Contents
1.6.3 Instruction Manual
1.7 REPACKING FOR SHIPMENT
1.8
OM’IONALACCESSOIXES
SECTION 2 - Operation
l-l
1-l
1-l
l-2
l-2
l-2
l-2
l-3
l-3
l-3
l-3
2.1 INTRODUCTION
.........................
2-l
2.2 HANDLING PRECAUTIONS
................
2-l
2.3
EQUIVALENT CIRCUIT
....................
2-2
2.4
MLKTI-CARD CONFIGURATIONS ...........
2-2
2.5
CONNECTIONS _.., _, ., _.., ..__ __
2-6
2.5.1
Connections Using Model 7169~KIT
2-6
2.5.2 Connections Using Model 7169-MTC Cable 2-10
25.3
Shielded Cables
2-12
2.6
CARDINSTALLATIONANDREMOVAL
2-12
2.6.1
Scanner Card Installation 2-12
2.6.2
Scanner Card Removal 2-14
2.7
MAINFRAME CONTROL OF SCANNER CARD
2-14
2.7.1
Matrix Mode 2-14
2.7.2 Multi-Channel Svstems
2-18
2.7.3
Scanner Switch&g Control
2-18
2.7.4
ReactiveLoads ,__._.__..,,__,,....._..
2-19
SECTION 3 - Applications
3.1 INTRODUCTION
3-l
3.2
COUPON TESTING
3-l
3.3 CABLING INSULATION TESTING
3-2
SECTION 4 - Service Information
4.1 INTRODUCTION
4-l
4.2
HANDLING AND CLEANING PRECAUTIONS 4-l
4.3 PERFORMANCE ~RIFICATION
4-2
4.3.1 Environmental Conditions
4-2
4.3.2 Recommended Equipment
4-2
4.3.3 Connector Preparation
4-2
4.3.4 Channel Isolation Tests
4-3
4.3.5 Input Isolation Tests
4-8
4.3.6
Path Resistance Tests
4-10
SECTION 5 - Replaceable Parts
5.1 INTRODUCTION
.......................
5.2
PARTSLISTS ..........................
5.3
ORDERING INFORMATION ..............
5.4 FACTORY SERVICE .....................
5.5 COMPONENT LAYOUT AND SCHEMATIC
DIAGRAM
............................
5-l
5-1
5-l
5-l
5-2
List of Illustrations
SECTION 2 - Operation
Figure 2-I
Figure 2-2
Figure 2-3
Figure 2-4
Figure 2-5
Figure 2-6
Figure 2-7
Figure 2-8
Figure 2-9
Figure 2-10
Model 7169 Simplified Schematic
Multi-Card Configuration
Separate Outputs Configuration
Connectors on Scanner Card
(Pin Side Shown)
Female Connector Pin Identification
(Terminal Crimp Side Shown)
Model 7169-MTC-10
Card Installation in Model 705
Card Installation in Model 706
Limiting Capacitive Reaction Current
Limiting Inductive Reaction Voltage
SECTION 3 -Applications
Figure 3-l Coupon Insulation Resistance Testing
3-2
Figure 3-2 Cabling Insulation Testing
3-3
SECTION 4 - Service Information
Figure 4-1
Figure 4-2
Figure 4-3
Channel Isolation ...............
Input Isolation ............
....
Path Resistance .................
2-2
2-4
2-5
2-6
2-7
2-10
2-13
2-14
2-19
2-21
4-5
4-9
4-11
List of Tables
SECTION 2 - Operation
Table 2-l
Table 2-2
Table 2-3
Table 2-4
Connector Pin Identification
2-8
Model 7169-MTC Conductor Identification
2-11
Scanner Control of Model 7169 Matrix
Mode (O-Pole)
2-16
Model 705 Channel Assignments in O-Pole
Mode . . . . . . . . . . . . ..t.............
2-18
SECTION 4 - Service Information
Table 4-l
Verification Equipment
4-3
Table 4-2
Connector Pin Identification
4-6
SECTION 1
General Information
1.1 INTRODUCTION
Thissectioncontainsgenerali~~formationabouttheModel7169 General
Purpose Scanner Card.
1.2
Warranty Information
1.3 Manual Addenda
1.4 Safety Symbols and Terms
1.5
Specifications
1.6 Unpacking and Inspection
1.7
Repacking for Shipment
1.8
Optional Accessories
1.2 WARRANTY INFORMATION
Warranty information is located on the inside front cover of this instruc-
tion manual. Should your Model 7169 require warranty service, contact
the Keithley representative or authorized repair facility in your area for
further information. When returning the scanner card for repair, be sure
to fill out and include the service form at theback of this manual in order
to provide the repair facility with the necessary information.
1.3 MANUAL ADDENDA
Any improvements or changes concerning the scanner card or mar\ual
will be explained in an addendum included with the unit. Be sure to
note these changes and incorporate them into the manual.
l-l
SECTION 1
Genend Infomntion
1.4 SAFETY SYMBOLS AND TERMS
The following symbols and ternx may be found on an instrument or
used in this manual.
The symbol
A on an instrument indicates that the user should refer
to the operating instructions located in the instruction manual.
The symbol
on an instrument shows that high voltage may be
present on the terminal(s). Use standard safety precautions to avoid
personal contact with these voltages.
The WARNING heading used in this ~nanual explains dangers that
nxight result in personal injury or death. Always read the associated information very carefully before performing the indicated procedure.
The CAUTION heading used in this manual explains hazards that
could damage the scanner card. Such damage may invalidate the warranty.
1.5 SPECIFICATIONS
Model 7169 specifications may be found at the front of this manual.
These specifications are exclusive of the scanner mainframe specifica-
tions.
1.6 UNPACKING AND INSPECTION
1.6.1 Inspection for Damage
The Model 7169 is packaged in a resealable bag to protect it frown contamination that could degrade performance. Before removing the card
from the bag, observe the following precautions on handling.
1-2
1 2 Always grasp the card by the side edges. Do not touch the edge con-
nector, board surfaces or components.
When not installed in the mainframe, keep the card in the bag and
store in the original packing carton. After removing the card from
the bag, inspect if for any obvious signs of physical damage. Report
any such damage to theshippingagent immediately. Save the origi-
nal packing carton for possible fuhue reshipment.
1.6.2
Shipping Contents
The following items are included with every Model 7169 order:
l Model 7169 Scanner Card
l Model 7169 Instruction Manual
* Additional accessories as ordered
1.6.3 Instruction Manual
If an additional instruction manual is required, order the manual pack-
age,Keithleypart~~utnber7169-901-00.Themanualpackageincludesan
instruction manual and any pertinent addenda.
1.7 REPACKING FOR SHIPMENT
Should it become necessary to return the Model 7169 for repair, carefully pack the unit in its original packing carton or the equivalent, and
include the following information:
. Advise as to the warranty status of the scanner card.
l Write ATTENTION REPAIR DEPARTMENT on the shipping label.
a Fill out and include the service form located at the back of this man-
ual.
1.6 OPTIONAL ACCESSORIES
The following accessories are available from Keithley for use with the
Model 7169:
1-3
Model 7169-MTC-10-Tl~eModel7169-MTC-10is a lo-foot, cable that
allows connection between the 7169 and the supplied mating connectors (7169-KIT)
Model 7169-KIT-The Model 7169XIT mates to the scanner card connectors.
Model 7169-MTR -The Model 7169-MTR is a bulkhead mount connector that mates to the Model 7169-MTC-10.
1-4
SECTION 2
Operation
2.1 INTRODUCTION
This section contains information on aspects of scanner card operation
and is arranged as follows:
2.2 Handling Precautions: Details precautions that should be observed
when handling the scanner card to ensure that its performance is not de-
graded due to contamination.
2.3 Equivalent Circuit: Provides the simplified scanner card circuit for
the Model 7169.
2.4 Multi-Card Configurations: Explains two basic methods for using
multiple cards; common OUTPUT and separate OUTPUTS.
2.5 Connections: Explains the various methods and techniques that
can be used to make connections to the xanner card.
2.6 Card Installation and Removal: Covers the basic procedure for installing and removing the card from the scanner mainframe.
2.7 Mainframe Control of Scanner Card: Covers operating aspects
specific to the Model 7169.
2.2 HANDLING PRECAUTIONS
To maintain high impedance isolation, care should be taken when handling the scanner card to avoid contamination from foreign materials
such as body oils. Such contamination can substantially increase leakage currents, degrading performance.
2-1
SECTION2
Operation
To avoid possible contamination, always grasp the card by the side
edges, Do not touch the edge connectors of the card and do not touch
board surfaces or components. When not installed in a mainframe, keep
the card in the bag and store in the original packing carton.
Dirt build-up over a period of time is another possible source of con-
tamination. To avoid this problem, operate the mainframe and scanner
card only in a clean environment.
If the card should become contaminated, it should be thoroughly
cleaned as explained in paragraph 4.2.
2.3 EQUIVALENT CIRCUIT
Figure 2-l shows the equivalent circuit of the Model 7169.
Each channel is a single-pole, double throw (l-Form C) isolated switch.
The factory installed jumper in series with the COMMON terminal can
be removed if a limiting resistor is required. Two undedicated on card
buses are available for intracard connections
Figure 2-l. Model 7169 Simplified Schematic
2.4 MULTI-CARD CONFIGURATIONS
Typically, multi-card systems are configured by connecting one or more
of the terminal blocks of all the scanner cards together. An example of
2-2
SECTION 2
Operatimi
this type of configuration is shown in Figure 2-2, which connects the
common and normally closed pins of a three-card system together. This
common output system allows a single piece of equipment to operate all
60 channels.
Another possible way to configure a multi-channel system is with separate outputs. Figure 2-3 shows a two-card system with separate out
puts. With this type of configuration, more than one test system can be
controlled by the master mainframe.
2-3
SECTION 2
Opemtion
Ch 40
Ch 41
Ch 60
CXd
2
c
0
NC
0
Cd
3
C
NC
=I I
Figure 2-2. Multi-Card Configuration
2-4
SECTION 2
Opemiotr
Ch 21
Card
CL
2
c
NC
o”tp”t 2
NO
Ch 40
Figure 2-3. Sepnrate Outputs Configurntion
2-5
SECTION 2
Operation
2.5 CONNECTIONS
CAUTION
Contamination will degrade the performance of the scan-
ner card. To avoid contamination, always grasp the card by
the side edges. Do not touch the board surfaces or compo-
nents.
Figure 2-4 shows the connectors on the scanner card. Table 2-l references scanner card terminals to connector pins and channel numbers.
For example, Channel 1 common is connected to pin A of J102 and Channel 1 normally-open is connected to pin B of J103.
?
I
l- PC
Board
%wre 2-4. Connectors on Scanner Card (Pin Side Shown)
The connector on the scanner card will mate to either a connector
(Model 7169~KIT) or to an optional mass terminated cable (Model
7169-MTC-10).
The following procedure explains how to mate the connector to the
Model 7169.
1. Mate the female connector to the male connector on the PC board.
2. Tighten the jackscrew finger tight. This is the locked position and
secures the connectors together.
2.51
Connections Using Model 7169.KIT
The Model 7169-KIT is a connector that mates to the connector on the
back panel of the Model 7169. Cabling from instrumentation and DUTs
2-b
SECTION 2
Operrrtion
can be crimped directly to the pins that fit into the 7169-KlT connector.
The terminals of this connector will accommodate up to #l8 AWG wire.
Figure 2-5 shows the pinout of the male connector for all three terminals
blocks. Table 2-1 can be used to identify scanner card terminals.
Figure 2-5. Female Connector Pin Identificntion
(Terminal Crimp Side Shown)
2-7
SECTION 2
Opemtion
Table 2-l. Connector Pin Identification
Matrix
%mnel Location Contact Connector Pin
1
Ll
C J102 A
J103 A
J103 B
2
12
J102
NC J103
:
NO J103 D
3
1,3
C J102 C
NC J103 E
NO J103
4
I,4
C 1102 :
J103 H
J103 J
5
2J
C J102
NC 1103 :
NO
J103 L
6
22
C J102
NC J103 i
NO J103 N
7
2,3
C JlO2 H
J103 I’
2-8
SECTION 2
Opernrion
-
Zhannel
13
14
15
16
17
18
19
20
Connector Pin Identification
Matrix
Location Contact Connector Pin
411
C JlOZ P
NC JlOl
NO JlOl :
42
C J102
NC JlOl ;
NO
JlOl J
4,3
C J102
NC
JlOl i?
NO JlOl L
4,4
C
JlO2
NC
JlOl &
NO JlOl N
5,l
J102 LJ
JlOl I’
NO JlOl
52
C JlO2
NC
JlOl S
NO JlOl
5,3
C J102 ib
NC JlOl U
NO JlOl V
5,4
C
J102
NC
JlOl $
NO JlOl X
2-9
2.5.2 Connections Using Model 7169-MTC Cable
The Keithlev Model 7169-MTC-10 (see Figure 2-6) is a 20.conductor,
(Side View)
1 i%ure 2-G. Model 71G9-MTC-10
If the cable is going to be used, a 7169-MTR becomes part of the user’s
test fixture with instrumentation and DUTs crimped directly to its terminal pins. The Model 7169-MTR is the same connector that is used on
the panel of the Model 7169. Its pins will accommodate up to #18 AWG
wire.
Another way to use the cable is to remove one of the connectors (by cutting the cable). In this &ration, the opposite end of the cable is mated to
the scanher card, while the unterminated end is hard-wired to instrumentation and DUT. Table 2-2 provides terminal identification for the
cable.
When used as is, each conductor of the IO-foot Model 7169-MTC-10 ca-
ble adds approximately 700mQ to the “contact resistance” specification
of the scanner card.
2-10
SECTION 2
Operdotl
Table 2-2. Model 7169-MTC Conductor Identification
Pin 1 Conductor
A
B :
C 3
D
4
E
5
F 6
H 7
J
8
K
9
L 10
M
11
N
12
P
13
R
14
S
15
;
17 16
V
18
W
19
X
20
Color
Black
White
Red
GW31
Ora*ge
Blue
White/Black
Red/Black
Green/Black
Orange/Black
Blue/Black
Black/White
Red/White
Green/White
Blue/White
Black/Red
White/Red
Orange/Red
Blue/Red
Red/Green
2-11
SECTION2
Operation
2.5.3 Shielded Cables
RF1 can be generated when high voltages are switched. Shielded cables
are one way to reduce the amplitude of the emissions. If a shielded cable
is used along with a Model 7169-KIT to connect to the Model 7169, the
shield should be connected to earth at one end of the cable. There are no
unused pins on JlOl, J102, and J103, so theshieldmustbe connected external to the connectors.
Any cabling used with the Model 7169 should have a working voltage
specification of at least 500V
2.6
CARD INSTALLATION AND REMOVAL
The following procedures explain how to install and remove the Model
7169 scanner card with the Models 705 and 706 scanner mainframes.
WARNING
To prevent electrical shock which could result in injury or
death, turn off the scanner power and disconnect the line
cord before installing or removing scanner cards. Also ensure no voltage is applied from user circuits.
CAUTION
Contamination will degrade the performance of the scannercard. To avoid contamination, always grasp the card by
the side edges. Do not touch the board surfaces or components.
2.6.1 Scanner Card Installation
Perform the following procedure to install the Model 7169 scanner card
in either the Model 705 or 706 mainframe. Refer to Figure 2-7 to install
the card in the Model 705 and refer to Figure 2-8 to install the card in the
Model 706.
2-12
SECTION 2
Operation
“igure 2-7. Card Insfollofion in Model 705
1 Slide the card into the desired slot as shown in the appropriate illus-
tration. Make sure the card edges of the board are properly aligned
with the grooves in the receptacle.
2. Once the card is almost all the way in the slot, and you encounter
resistance, push firmly on the edge of the card to seat it in the edge
connector.
3. Once the card is fully seated, lock the card in place by placing the
latches in the locked position.
2-13
SECTION 2
Operrrrion
Locking Tabs
Figure 2-8. Card Insbllnfion in Model 706
2.6.2
Scanner Card Removal
To remove the scanner card, first unlock it by pulling the latches outward, then grasp the end of the card at the edges, and pull the card out of
the scanner mainframe.
2.7 MAINFRAME CONTROL OF SCANNER CARD
Detailed information to program the Model 705 or 706 scanners is con-
tained in their respective instruction manuals. The following paragraphs provide the information specific to the Model 7169.
The Model 7169 is designed to operate in the matrix mode of the scanner
mainframe.
2.7.1 Matrix Mode
The mainframe scanner must be placed in matrix (O-Pole) mode to oper-
ate theModel7169. Keepinmind thatscannercardchannelnumbers are
2-14
SECTION 2
Operation
determined by the slot in which the card is installed. For example, with a
Model 7169 installed in the bottom slot (Card 2) of a Model 705, the 20
scanner card channels are assigned channel numbers 21 through 40.
Table 2-3 lists the matrix mode crosspoints that must be closed in order
to close the channels of a scanner card installed in a Model 705 or 706.
Since the Model 705 has only Iwo slots, only the first two card slots are
relevant.
2-15
SECTION 2
Operririorl
Table 2-3.
Scanner Control of Model 7169 Matrix Mode
(O-Pole)
:ARD :
Scannc !r
Relay
Ch. Na
,.
Controlled
01,l
01,2
01,3
01,4
1
2
3
4
02,l
02,2
02,3
02,4
5
6
s'
03,l 9
33,2 10
33,3 11
D3,4 12
34,l 13
14,2
14
J4,3 15
J4,4 16
J5,l 17
J5,2 18
J5,3 19
)5,
20
2-16
SECTION 2
Opemiotr
Scanner Control of Model 7169 Matrix Mode (O-Pole) (Cont.)
:ARD2 01,l
21
01,2 22
01,3 23
01,4 24
02,l
02,2
02,3
02,4
03,l
03,2
03,3
03,4
04,l
04,2
04,3
04,4
25
26
;i
29
30
31
32
33
34
35
36
05,l
37
etc. etc.
2-17
SECTION 2
Opemtion
2.7.2 Multi-Channel Systems
Additional channels are available using additional scanner cards. The
Model 705 has two card slots. Thus, using one Model 705,40 channels
could be configured. With the maximum of five Model 705s daisy
chained, 200 channels could be configured.
NOTE
Refer to the mainframe’s instruction manual for information
concerning daisy chain operation.
Scanner card channel assignments for up to five mainframes are shown
in Table 2-4.
Table 2-4. Model 705 Channel Assignments in O-Pole Mode
Card # Master
Slave #l Slave #2
Slave #3 Slave #4
1 01 - 20 41-60 81- 100 121- 140 161- 180
2 21-40 61-80 101 - 120 141- 160 181- 200
The Model 706 has 10 card slots. Thus, using one Model 706,200 channels could be configured. With the maximum of five Model 706s daisy
chained, 1000 channels could be configured.
2.7.3 Scanner Switching Control
The Models 705 and 706 operate on a “break-before-make” basis when
scanning. A delay of lmsec occurs between the time the current channel
opens until the next channel closes to ensure that no two channels are
connected together.
When switching channels manually, however, it is possible to have two
or more channels on simultaneously. In this situation, it is important
that the potential between channels does not exceed the maximum sig-
nal level of the Model 7169.
2-18
2.7.4 Reactive Loads
Since reactive loads can cause excessive currents and voltages, current
surge limiting (for capacitive loads) and voltage clamping (for inductive
loads) are required to prevent damage to relays and external circuitry.
Capacitive Loads
The surge current from a capacitive load must be <0.5A for the Model
7169 to protect the relays and circuit board. Figure 2-9 shows typical circuits to limit current surges. Also, consider the maximum load of 1OW
for the Model 7169 when determining the current limit. For example,
when switching 1OOV with the Model 7169, the current must be limited
to:
I = VA/V = lOVA/lOOV = lOOmA
The current limiting resistor as used in Figure 2-9A would be:
R = V/I = lOOV/lOOmA = lkn 0 1OW
A. Resistor Limited
, High reSiSla”Ce VAlsn Cold.
LOW mSiSta”Ce wile” hot.
FaStthslmsl recovery.
-!7
B. Thermistor Limited
Figure 2-9.
Limiting Capacitive Renction Current
2-19
SECTION 2
Operation
Inductive Loads
Inductive reaction voltage, L (di/dt), must be less than 500V. Typical
clamping circuits are shown in Figure 2-10. Also, consider the maximum load of 1OW for the Model 7169 when determining the voltage
limit. For example, when switching 200mA with the Model 7169, the
voltage must be limited to:
V = VA/I = lOW/ZOOmA = 50V
The value of the voltage clamping resistor used in Figure 2-10A would
be:
R = V/I = 5OV/2OOmA = 250.Q 0 1OW
Z-20
SECTION 2
Operntim
Figure 2.10. Limiting Inductive Renction Voltage
2-21
SECTION 3
Applications
3.1 INTRODUCTION
This section provides some possible applications for the Model 7169
Scanner Card and is arranged as follows:
3.2 Coupon Testing: This application uses the Form C relays and oncard bus to simplify wiring for high voltage PC board insulation resistance testing.
3.3 Cable Insulation Testing: This application uses bank switching
and the on-card bus to simplify insulation resistance testing of multiconductor cables.
3.2 COUPON TESTING
Standard test procedures for printed circuit board insulation resistance
testing often call for “soaking” and testing at a different high voltage
levels. Figure 3-l shows pairs of two relays configured for different soak
and test voltage sources as well as provision for shorting the DUT to ref-
erence after testing for safety.
With both channels open, a soak voltage is applied through current limit
resistor Rl. Note that the factory installed jumper can be removed and
replaced with Rl. To apply the test voltage, channel 1 is closed. After
taking the test reading, channel 2 can be closed to discharge the capaci-
tance of the DUT and cabling.
Each Model 7169 allows 10 DUT to be tested using this set-up. The two
on-card buses can also be used to bus the soak and test voltages so that
3-1
SECTION3
Applications
only two external connections are needed for each source instead of two
for each channel.
Figure 3-Z. Coupon lnsulntion Resistance Testing
3.3 CABLING INSULATION TESTING
The insulation resistance of multiple conductor cables can efficiently be
measured using the Model 7169. Up to 180 conductors dr pins may be
tested using the Model 7169 in a Model 706 mainframe scanner.
Closing a given chnnnel will measure the insulation resistance from all
other channels to that channel. Soak voltage and time is implicit in this
set-up. It is controlled by the V-source output voltage and delay time
from one channel closure to the next. A programmable V-source would
allow for automated changes insoakand test voltage. This would not be
necessary if the soak and test voltage are the same.
3-2
SECTION3
A/?pliCl7tiOllS
Figure 3-2. Cabling Insdntion Testing
3-3
SECTION 4
Service Information
4.1 INTRODUCTION
This section contains information necessary to service the Model 7169
and is arranged as follows:
4.2 Handling and Cleaning Precautions: Discusses handling procedures and cleaning methods for the scanner card.
4.3 Performance Verification: Covers the procedures necessary to determine if the card is operating properly.
4.2 HANDLING AND CLEANING PRECAUTIONS
Because of the high impedance circuits on the Model 7169, care should
be taken when handling or servicing the card to prevent possible contamination, which could degrade performance. The following precautions should be taken when handling and cleaning the scanner card.
1. Do not store or operate the card in an environment where dust
could settle on the circuit board. Use dry nitrogen gas to clean dust
off the card if necessary.
2. Handle the card only by the side edges. Do not touch any board surfaces or components associated with the repair. When servicing the
card, wear clean, cotton gloves.
3. If making solder repairs on the circuit board, use a flux that is rosin
RMA based. Remove the flux from these areas when the repair is
complete. Use Freon@ TMS or TE, or the equivalent along with
plenty of clean cotton swabs to remove the flux. Take care not to
spread the flux to other areas of the circuit board. Once the flux has
been removed, swab only the repaired area with methanol, then
blow dry the board with dry nitrogen gas.
4-1
SECTION 4
Semite Inj%rmotion
4. After cleaning, the card should be placed in a 50°C low humidity
environment for several hours.
4.3 PERFORMANCE VERIFICATION
The following paragraphs discuss performance verification procedures
for the Model 7169, including isolation and path resistance. The performance verification procedures should be performed with the scanner
card installed in the Model 705 or706 mainframe to protect it from contamination and allow it to operate in its normal environment.
CAUTION
Contamination will degrade the performance of the scannercard. To avoid contamination, always grasp the card by
the &de edges. Do not touch the board surfaces or components.
NOTE
Failure of any performance verification test may indicate
that the scanner card is contaminated. See paragraph 4.2 to
clean the card.
4.3.1
Environmental Conditions
All verification measurements should be made at an ambient tempera-
ture between 18 and 28”C, and at a relative humidity of less than 70%.
4.3.2
Recommended Equipment
Table 4-l summarizes the equipment necessary for performance verifi-
cation, along with an application for each unit.
4.3.3 Connector Preparation
For the test procedures, a connector (7169.KIT) is used to make circuit
connections to the scanner card. These connectors are available as an accessory.
4-2
Table 4-1. Verification Equipment
Electrometer
I
Specifications
lOOnA; 0.25%
IOOV source;
0.2%
3olm; 0.01%
-
Path resistance
Connections to
Prepare three 7169-KIT connectors as follows:
1. Using clean #18-24 AWG copper wire, crimp wires to all of the terminals. Each wire should be approximately six inches long.
2. Insert each terminal into a connector, LABELING the wire with the
pin location letter.
3. Assemble the connector body.
4. Mate the three connectors to JlOl, J102 and J103 on theModel7169.
4.3.4
Channel Isolation Tests
These tests check the resistance (isolation) between two channels. In
general, the test is performed by applying a voltage (+lOOV) across two
channels, and then measuring the leakage current. The isolation resistance is then calculated as R = V/I. In the following procedure, the
Model 617 functions as both a voltage source and a picoammeter. In the
V/I function, the Model 617 internally calculates the resistance from the
known voltage and measured current levels and displays the resistance
V&l?.
Referring to Figure 4-1, perform the following procedure to check chan-
nel isolation:
WARNING
The following steps use high voltage (100X!). Be sure to remove power from the circuit before making connection
changes.
4-3
SECTION4
Service Information
1. Using Table 4-2 to identify scanner card tenninals, connect the
Model 617 to the scanner card as shown in Figure 4-1.
2. On the Model 617, select the 2pA range, and enable zero check and
zero correct in that order. Leave zero correct enabled for the entire
procedure.
3. On the Model 617, set the voltage source for +lOOV, and select the
200nA current range. Make sure the voltage source is still in
standby.
4. Place the Model 617 in the V/I measurement function by pressing
SHIFT OHMS.
5. OntheMode1617,disablezerocheckandpressOPERATE tosource
1oov.
6. After allowing the reading on the Model 617 to settle, verify that it is
>lGCL
7. Place the Model 617 in standby and enable zero check.
8. Connect the electrometer input HI lead to channel 3 of the scanner
card.
9. Repeat steps 5 through 8.
10. Repeat the basic procedure in steps 8 and 9 for channels 4 through
20.
4-4
CHI
A
CH2
Equivalent Circuit
NOTE : Setup shown is configured lo test isolalion between
channels 1 and 2.
Table 4-2. Connector Pin Identification
Channel
1
2
3
4
5
6
7
8
9
10
11
12
contact
C
::
I&
NO
C
NC
NO,
C
i%
C
NC
NO
C
NC
NO
C
i%
C
NC
NO
C
it:
C
::
C
NC
NO
C
NC
NO
connectoi
J102
J103
1103
JlO2
J103
J103
JlOZ
J103
J103
J102
J103
J103
J102
1103
J103
JlOZ
J103
J103
JlOZ
J103
1103
JlO2
J103
J103
J102
J103
J103
J102
J103
J103
J102
JlOl
JlOl
J102
JlOl
JlOl
r 1
-
Pir
-
A
A
B
:
D
C
E
F
D
H
J
E
K
L
ll
N
H
P
R
J
S
T
K
::
L
u
X
M
A
B
?.I
C
D
-
4-G
SECTION 4
Service Itfornmior~
Connector Pin Identification (Cont.)
:hannel
13
14
15
16
17
18
19
20
contact
C
NC
NO
C
NC
NO
C
ii:
C
NC
NO
C
NC
NO
I&
NO
C
NC
NO
C
NC
NO
C
J102
JlOl
JlOl
J102
JlOl
JlOl
J102
JlOl
JlOl
JlO2
JlOl
JlOl
J102
JlOl
JlOl
JlO2
JlOl
JlOl
J102
JlOl
JlOl
J102
JlOl
JlOl
-
‘in
P
E
F
R
13
i
K
L
li
N
U
P
:
s
;
u
V
X
w
X
-
4-7
SECTION 4
Service Ir~fo,matior~
4.3.5 Input Isolation Tests
These tests check the resistance (isolation) between the NC. and N.O.
terminals of every scanner card channel. In general, the test is performed by applying a voltage (1OOV) across the terminals and then
measuring the leakage current. The isolation resistance is then calcu-
lated as R = V/I. In the following procedure, the Model 617 functions as
a voltage source and an ammeter. In the V/I function, the Model 617 internally calculates the resistance from the known voltage and measured
current levels and displays the resistance value.
Referring to Figure 4-2, perform the following procedure to check differential input isolation:
WARNING
The following steps use high voltage (1OOV). Be sure to remove power from the circuit before making connection
changes.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Using Table 4-2 to identify scanner card terminals, connect the
Model 617 to the scanner card as shown in Figure 4-2.
On the Model 617, select the 2pA range, and enable zero check and
zero correct in that order. Leave zero correct enabled for the entire
procedure.
On the Model 617, set the voltage source for i-lOOV, and select the
200nA current range. Make sure the voltage source is still in
standby.
Place the Model 617 in the V/I measurement function by pressing
.
SHIET OHMS.
On the Model 617, disable zero check and press OPERATE to,
source 1oov.
After allowing the reading on the Model 617 to settle, verify that it is
>lGQ.
Place the Model 617 in standby and enable zero check.
Connect the electrometer Input HI lead to channel 1 N.O. of the
scanner card, and connect V-Source HI channel 1 COMMON.
Repeat the basic procedure in steps 5 through 8 for channels 2
through 20.
4-8
7169
cb;
+ A
V-SOUIW
Equivalent Circuit
4-9
SECTION4
Service h~ormalion
4.3.6 Path Resistance Tests
Referring to Figure 4-3, perform the following steps to verify that the
contacts of each relay are closing properly and the resistance is within
specification.
1.
2.
3.
4.
5.
6.
7.
Connect the Kelvin clip leads to the input of the Model 196 as
shown in Figure 4-3 and select the 3000 range.
Short the Kelvin clip leads together and zero the Model 196. Leave
zero enabled for the entire test.
Using Table 4-2 to identify scanner card terminals, connect the
Model 196 to the scanner card.
With the scanner in the step mode, close channel 1 (0,l). The reading
on the Model 196 should be <2n (0.3Q typical).
Open channel 1 and verify that the Model 196 indicates an open cir-
cuit (> 300MQ).
Move one lead from N.0 to NC. The reading on the 196 should be
c2.Q (0.3Q typical).
Repeat the basic procedure of steps 3 through 6 to test path resis-
tance of N.O. and N.C. of channels 2 through 10.
4-10
SECTION 4
Service Irlfornrafion
7169
7169
:;--1
Equivalent Circuit
4-11
SECTION 5
Replaceable Parts
5.1 INTRODUCTION
This section contains a list of replaceable electrical and mechanical parts
for the Model 7169, as well as a component layout drawing and schematic diagram of the card.
5.2 PARTS LISTS
Electrical parts are listed in order of circuit designation in Table 5-l. Table 5-2 summarizes miscellaneous parts.
5.3 ORDERING INFORMATION
To place a parts order, or to obtain information concerning replacement
parts, contact your Keithley representative or the factory (see the inside
front cover for addresses). When ordering parts, be sure to include the
following information:
1. Scanner card model number (7169)
2. Card serial number
3. Part description
4. Circuit description, if applicable
5. Keithley part number
5.4 FACTORY SERVICE
If the scanner card is to be returned to Keithley Instruments for repair,
perform the following:
5-1
SECTION 5
Replaceable Parts
1. Complete the service form at the back of this manual and include it
with the card.
2. Carefully pack the card in the original packing carton.
3. Write ATTENTIONREPAIRDEPARTMENTon theshippinglabel.
NOTE
Do not return the scanner mainframe with the card,
5.5 COMPONENT LAYOUT AND SCHEMATIC
DIAGRAM
Figure 5-1 shows a component layout of the Model 7169, while Figure
5-2 shows a schematic diagram.
5-2
TABLE 5-l. MODEL 7169, PARTS LIST
CIRCUIT
DESIG.
Cl-C5
C6
Cl
El
KI..KZO
Rl
R2
UI
U2,U5
u3
u4
Wl...W20
DESCRIPTION
KEITHLEY
PART NO.
CAP,.IuF,20%,50V,CERAMIC
CAF,22uF,-20+100%,25V
ALUM ELEC
CAP,lOuF,-20+100%,25V,
ALUM ELEC
BEAD,FERRITE
RELAY (SPDT)
RES,40.2K.l%,1/8W,METAL FILM
RES NET,4.lK,2%,1.5W
IC,BUF/LINE DRIVER & RECEIVER,
MC74HC241N
IC,OCTAL TRI-STATE BUFFER,
MM74HC240
IC,DUAL D-TYPE FLIP FLOP,
74HC74
IC, 8 STAGE SHIFT/STORE
REGISTER,4094
JUMPERS
C-365-.1
C-314-22
c-314-10
CT-9
RL-133
R-88-40.2
TF-19.4.7K
IC-520
IC-617
IC-337
IC-251
J-15
TABLE 5-2. MODEL 7169, MISCELLANEOUS PARTS LIST
KEITHLEY
QTY. DESCRIPTION
PART NO.
1 BACK PANEL 7169-301
2 HANDLE FA-I 19
1
HANDLING LABEL
MC-348
2 RIVET FA-121
1
I
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