Model STA-3108A3
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
(440) 248-0400
Fax: (440) 248-6168
www.keithley.com
Figure 1
Model STA-3108A3
Packing List
Introduction
This document contains information necessary to successfully install your hardware.
WARNING
The STA-3108A3 is not intended for use in circuits carrying voltages in excess of 30V
RMS, 42.4V peak, or 60VDC.
PA-668 Rev. B / 7-02
Descriptions
The STA-3108A3 has four 26-pin connectors that map the required signals to enable the attachment of up to four MB-02 backplanes providing a total of 64 channels. See Figure 2. Channel selection jumpers are provided for each of the four connectors.
The screw terminals on the STA-3108A3 screw terminal connector let you connect field wiring to another board such as a
KPCI-3108 board using an IEEE-1284 C-C cable. The screw terminals are labeled from 1 to 36 and correspond directly to the
functions of the pins on the main I/O connector on the KPCI-3108 board. For example, if pin 24 is assigned to the analog
function OP0, use screw terminal 24 to attach a hardware output 0. Refer to the User’s Guide for the board to which you are
connecting the STA-3108A3 for detailed wiring information.
The STA-3108A3 panel has rubber feet and mounting holes and includes a plastic case that protects the underside of the board.
The case can be mounted in a standard DIN rail using the DIN rail mounting kit (not included).
Figure 2
STA-3108A3 cable connections
MB-02 MB-02 MB-02 MB-02
KPCI
BOARD
WARNING
STA-3108A3
36
3132333435 30 29 28 272625 24 23 22 21 20 19
18
J2
J3
J2AJ2B
J2D
J2C
J1B J1A
18
J3AJ3B
J3D
J3C
36
C-2600
3132 30 29 28 272625 24 23
98765
J2
J3
1314 12 11 10
18
36
36
J5
J4
J1A
1
19
CAB-1284CC
ANALOG
CAB-1284CC
DIGITAL
When using the STA-3108A3, the maximum voltage allowed is 30V RMS, 42.4V peak,
or 60VDC. Exceeding this limit could cause an insulation failure and shock hazard.
STA-3108A3
987654321
1314151617 12 11 10
18
36
J5
J4
J5AJ5B
J5D
J5C
J4AJ4B
J4D
1
J4C
19
CAUTION
Although the STA-3108A3 is rated for 60 volts peak-to-peak, the board to which it is
connected may be rated for a much lower voltage. For example, the KPCI-3108 analog
inputs can only tolerate 35 volts peak without damage, and digital I/O will be damaged by voltages above +5V.
2
Specifications
Voltage: 30V RMS, 42.4V peak, or 60VDC
Current: 1 amp maximum
Environment: –30˚C to +85˚C
Safety precautions
Observe the following safety precautions before using this product and any associated instrumentation. Although some instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions
may be present.
This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions
required to avoid possible injury. Read the operating information carefully before using the product.
General definitions
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, and for ensuring that oper-
ators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the
instrument. They must be protected from electric shock and contact with hazardous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating; for example, setting the line voltage
or replacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if the
operator may perform them. Otherwise, they should be performed only by service personnel.
Service personnel are trained to work on live circuits, and perform safe installations and repairs of products. Only properly
trained service personnel may perform installation and service procedures.
!
The symbol on an instrument indicates that the user should refer to the operating instructions located in the manual.
The symbol on an instrument shows that it can source or measure 1000 volts or more, including the combined effect of
normal and common mode voltages. Use standard safety precautions to avoid personal contact with these voltages.
The WARNING heading in a manual explains dangers that might result in personal injury or death. Always read the associated
information very carefully before performing the indicated procedure.
The CAUTION heading in a manual explains hazards that could damage the instrument. Such damage may invalidate the
warranty.
3
Installation
As described in the International Electrotechnical Commission (IEC) Standard IEC 664, the signal terminals are Installation
Category I and must not be connected to mains.
Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limited
sources. NEVER connect switching cards directly to AC mains. When connecting sources to switching cards, install protective
devices to limit fault current and voltage to the card.
Operators and maintainers of this product must be protected from electric shock at all times. The responsible body must ensure
that users are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to
potential human contact. Product users in these circumstances must be trained to protect themselves from the risk of electric
shock. If the circuit is capable of operating at or above 1000 volts, no conductive part of the circuit may be exposed.
Operation
Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fixtures.
The American National Standards Institute (ANSI) states that a shock hazard exists when 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.
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under
test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.
Do not touch any object that 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 instruments and accessories, as defined in the specifications and operating information, and as shown on the instrument or test fixture panels, or switching card.
Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use
of a lid interlock.
Instrumentation and accessories shall not be connected to humans.
Maintenance and service
Inspect the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.
Before performing any maintenance, disconnect the line cord and all test cables.
Cleaning
Keep the connections free of contaminants (such as dirt, oil, etc.) in order to maintain maximum insulation resistance. If the
connections become contaminated, clean them thoroughly with methanol and allow them to dry completely before use.
4
Before you install your STA-3108A3
CAUTION
Figure 3
Pin connections
Before you make any connections from an STA-3108A3 to a board in your computer,
ensure that power to your computer and any accessories is OFF.
J2A J2B
J3A J3B
36
35 30 29 28 272625 24 23 22 21 20 19
34
18
17 12 11 10
J2
J3
J2D
J2C
J1B J1A
18
J3D
J3C
36
16
313233
9
131415
18
36
7654321
8
J5
J4
J5A J5B
J5D
J5C
J4A J4B
1
19
J4D
J4C
5
Table 2
Signal mapping
6
Table 1
Pin to terminal connections
Pin Terminal Pin Terminal Pin Terminal
1 1 13 13 25 25
2 2 14 14 26 26
3 3 15 15 27 27
4 4 16 16 28 28
5 5 17 17 29 29
6 6 18 18 30 30
7 7 19 19 31 31
8 8 20 20 32 32
9 9 21 21 33 33
10 10 22 22 34 34
11 11 23 23 35 35
12 12 24 24 36 36
STA-3108A3 four 26-pin connectors (3M3433)
J2 J3 J4 J5
Pin Signal Pin Signal Pin Signal Pin Signal
1 J2 Ch select 1 J3 Ch select 1 J4 Ch select 1 J5 Ch select
2 LLGND* 2 LLGND* 2 LLGND* 2 LLGND*
3ODAC03ODAC13 NC 3 NC
4 LLGND* 4 LLGND* 4 LLGND* 4 LLGND*
5 LLGND* 5 LLGND* 5 LLGND* 5 LLGND*
6 LLGND* 6 LLGND* 6 LLGND* 6 LLGND*
7 XOP0/MUX4 7 XOP0/MUX4 7 XOP0/MUX4 7 XOP0/MUX4
8 XOP1/MUX5 8 XOP1/MUX5 8 XOP1/MUX5 8 XOP1/MUX5
9 XOP2/MUX6 9 XOP2/MUX6 9 XOP2/MUX6 9 XOP2/MUX6
10 XOP3/MUX7 10 XOP3/MUX7 10 XOP3/MUX7 10 XOP3/MUX7
11 DGND 11 DGND 11 DGND 11 DGND
12 DGND 12 DGND 12 DGND 12 DGND
13 XOP0/MUX4 13 MUX4 13 XOP0/MUX4 13 XOP0/MUX4
14 XOP1/MUX5 14 MUX5 14 XOP1/MUX5 14 XOP1/MUX5
15 XOP2/MUX6 15 MUX6 15 XOP2/MUX6 15 XOP2/MUX6
16 XOP3/MUX7 16 MUX7 16 XOP3/MUX7 16 XOP3/MUX7
17 DGND 17 DGND 17 DGND 17 DGND
18 DGND 18 DGND 18 DGND 18 DGND
19 DGND 19 DGND 19 DGND 19 DGND
20 DGND 20 DGND 20 DGND 20 DGND
21 NC 21 NC 21 NC 21 NC
22 NC 22 NC 22 NC 22 NC
23 NC 23 NC 23 NC 23 NC
24 NC 24 NC 24 NC 24 NC
25 DGND 25 DGND 25 DGND 25 DGND
26 DGND 26 DGND 26 DGND 26 DGND
*LLGND is AGND.
Note: Signal names on the STA-3108A3 36-pin connectors are based on signal names from the 50-pin connector on the EXP-1800.
Mounting the STA-3108A3
Your STA-3108A3 screw terminal panel is shipped with the hardware necessary for mounting.
To mount the STA-3108A3:
¥ Place the STA-3108A3 at its operating location with the rubber feet on the mounting surface. Use the four (4) screws to
secure the panel.
Wiring the STA-3108A3
1. Before installing I/O cables and connecting I/O circuits to the STA-3108A3, refer to the user’s guide for the board(s) to
which you are connecting the STA-3108A3.
2. Attach the 1284CC cable to either of the 36-pin D connectors. J1A and J1B are connected in parallel and either one can be
connected to the KPCI-31XX analog connector.
3. Attach the ribbon cable to the 36-pin connectors.
Table 3
Jumper settings
J2_Jumper Ch selected J3_Jumper Ch selected J4_Jumper Ch selected J5_Jumper Ch selected
J2A CH0H J3A CH1H J4A CH2H J5A CH3H
J2B CH4H J3B CH5H J4B CH6H J5B CH7H
J2C CH0L/CH8H J3C CH1L/CH9H J4C CH2L/CH10H J5C CH3L/CH11H
J2D CH4L/CH12H J3D CH5L/CH13H J4D CH6L/CH14H J5D CH7L/CH15H
Board dimensions
STA-3108 A3
(Not To Scale)
2.840
72.1mm
1.250
31.8mm
0.147 Ø (4 Places)
3.7mm
0.780
19.8mm
0.200
5.1mm
6.275
159.4mm
6.550
166.4mm
7
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