Keithley 2000-Scan User manual

User’s Manual
2000-SCAN-900-01 Rev. A / April 2018
*P2000-SCAN-900-01A*
2000-SCAN-900-01A
tek.com/keithley
Model 2000-SCAN
Scanner Card for use with the DMM6500

Scanner Card
User's Manual
© 2018, Keithley Instruments, LLC
Cleveland, Ohio, U.S.A.
All rights reserved.
Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part,
without the prior written approval of Keithley Instruments, LLC, is strictly prohibited.
These are the original instructions in English.
TSP®, TSP-Link®, and TSP-Net®are trademarks of Keithley Instruments, LLC. All Keithley
Instruments product names are trademarks or registered trademarks of Keithley Instruments, LLC.
Other brand names are trademarks or registered trademarks of their respective holders.
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Microsoft Corporation in the United States and/or other countries.
Document number: 2000-SCAN-900-01 Rev. A / April 2018
Model 2000-SCAN

General Information....................................................................................................1-1
Introduction .......................................................................................................................... 1-1
Features............................................................................................................................... 1-1
Unpacking and inspection.................................................................................................... 1-1
Inspecting for damage...............................................................................................................1-1
Handling precautions ................................................................................................................1-2
Factory service..................................................................................................................... 1-2
Card connections and installation............................................................................2-1
Introduction .......................................................................................................................... 2-1
Installation handling precautions.......................................................................................... 2-1
Board cleaning..................................................................................................................... 2-1
Connections ......................................................................................................................... 2-2
Connection precautions ............................................................................................................2-2
Card configurations...................................................................................................................2-2
Card connectors........................................................................................................................2-4
Output connections ...................................................................................................................2-5
Wiring procedures.....................................................................................................................2-5
Dressing leads ..........................................................................................................................2-6
Typical connecting schemes................................................................................................ 2-7
Voltage connections..................................................................................................................2-7
Resistance connections ............................................................................................................2-8
Card installation and removal ............................................................................................ 2-10
Scanner card installation.........................................................................................................2-11
Output connections to the multimeter......................................................................................2-13
Scanner card removal.............................................................................................................2-14
Operation.....................................................................................................................3-1
Introduction .......................................................................................................................... 3-1
Signal limitation.................................................................................................................... 3-1
Relay input signal limitations.....................................................................................................3-1
Scanner card detection........................................................................................................ 3-2
Power-up detection ...................................................................................................................3-2
Scanner option remote command .............................................................................................3-2
Basic front-panel measurements......................................................................................... 3-2
Opening and closing channels from the CHANNEL swipe screen............................................3-2
Building a scan..........................................................................................................................3-4
RTD temperature measurements ........................................................................................ 3-6
Connecting RTD probes............................................................................................................3-6
Setting up an RTD measurement on the front panel.................................................................3-7
Typical applications.............................................................................................................. 3-7
Resistor testing .........................................................................................................................3-7
Current measurements ...........................................................................................................3-14
Measurement considerations............................................................................................. 3-17
Table of contents

Table of contents
Model 2000-SCAN Scanner Card
User's Manual
Path isolation...........................................................................................................................3-17
Magnetic fields ........................................................................................................................3-18
Electromagnetic interference (EMI).........................................................................................3-18
Ground loops...........................................................................................................................3-19
Keeping connectors clean.......................................................................................................3-20

Safety precautions
The following safety precautions should be observed before using this product and any associated instrumentation. Although
some instruments and accessories would normally be used with nonhazardous voltages, there are situations where hazardous
conditions may be present.
This product is intended for use by personnel who recognize shock hazards and are familiar with the safety precautions required
to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using the
product. Refer to the user documentation for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the
equipment is operated within its specifications and operating limits, and for ensuring that operators 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 properly, for example, setting the line
voltage or replacing consumable materials. Maintenance procedures are described in the user documentation. 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, perform safe installations, and repair products. Only properly trained
service personnel may perform installation and service procedures.
Keithley products are designed for use with electrical signals that are measurement, control, and data I/O connections, with low
transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high transient
overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient
overvoltages often associated with local AC mains connections. Certain Keithley measuring instruments may be connected to
mains. These instruments will be marked as category II or higher.
Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains.
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
30 V RMS, 42.4 V peak, or 60 VDC are present. A good safety practice is to expect that hazardous voltage is present in any
unknown circuit before measuring.
Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators
are prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential
human contact. Product operators 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 V, no conductive part of the circuit may be exposed.
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.
Before operating an instrument, ensure that 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 before each use.
When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input
power disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.
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.

For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or
accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be
impaired.
Do not exceed the maximum signal levels of the instruments and accessories. Maximum signal levels are defined in the
specifications and operating information and shown on the instrument panels, test fixture panels, and switching cards.
When fuses are used in a product, replace with the same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as protective earth (safety 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.
If a screw is present, connect it to protective earth (safety ground) using the wire recommended in the user documentation.
The symbol on an instrument means caution, risk of hazard. The user must refer to the operating instructions located in the
user documentation in all cases where the symbol is marked on the instrument.
The symbol on an instrument means warning, risk of electric shock. Use standard safety precautions to avoid personal
contact with these voltages.
The symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.
The symbol indicates a connection terminal to the equipment frame.
If this symbol is on a product, it indicates that mercury is present in the display lamp. Please note that the lamp must be
properly disposed of according to federal, state, and local laws.
The WARNING heading in the user documentation explains hazards that might result in personal injury or death. Always read
the associated information very carefully before performing the indicated procedure.
The CAUTION heading in the user documentation explains hazards that could damage the instrument. Such damage may
invalidate the warranty.
The CAUTION heading with the symbol in the user documentation explains hazards that could result in moderate or minor
injury or damage the instrument. Always read the associated information very carefully before performing the indicated
procedure. Damage to the instrument may invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains circuits — including the power
transformer, test leads, and input jacks — must be purchased from Keithley. Standard fuses with applicable national safety
approvals may be used if the rating and type are the same. The detachable mains power cord provided with the instrument may
only be replaced with a similarly rated power cord. Other components that are not safety-related may be purchased from other
suppliers as long as they are equivalent to the original component (note that selected parts should be purchased only through
Keithley to maintain accuracy and functionality of the product). If you are unsure about the applicability of a replacement
component, call a Keithley office for information.
Unless otherwise noted in product-specific literature, Keithley instruments are designed to operate indoors only, in the following
environment: Altitude at or below 2,000 m (6,562 ft); temperature 0 °C to 50 °C (32 °F to 122 °F); and pollution degree 1 or 2.
To clean an instrument, use a cloth dampened with deionized water or mild, water-based cleaner. Clean the exterior of the
instrument only. Do not apply cleaner directly to the instrument or allow liquids to enter or spill on the instrument. Products that
consist of a circuit board with no case or chassis (e.g., a data acquisition board for installation into a computer) should never
require cleaning if handled according to instructions. If the board becomes contaminated and operation is affected, the board
should be returned to the factory for proper cleaning/servicing.
Safety precaution revision as of June 2017.

In this section:
Introduction .............................................................................. 1-1
Features................................................................................... 1-1
Unpacking and inspection........................................................ 1-1
Factory service......................................................................... 1-2
Introduction
This section contains general information about the 2000-SCAN Scanner Card. The 2000-SCAN is a
scanner card used in the DMM6500 6½ Digit Graphical Sampling Multimeter. The 2000-SCAN
provides 10 channels of 2-pole relay switching. The channels can also be configured for 4-pole
operation.
If you are using this scanner card with the 2700, 2701, or 2750, please see the 2000-SCAN Scanner
Card Instruction Manual.
Features
Features of the scanner card include:
•Ten channels of 2-pole relay input.
•Configurable channels for 4-pole operation.
•Ability to multiplex one of ten 2-pole or one of five 4-pole channels into a DMM6500.
Unpacking and inspection
Inspecting for damage
The 2000-SCAN is packaged in a resealable, anti-static bag to protect from damage due to static
discharge and contamination that could degrade its performance. Before removing the card from the
bag, observe the following handling precautions.
Section 1
General Information

Section
1: General Information Model 2000-SCAN Scanner Card
User's Manual
1-2 2000-SCAN-900-01 Rev. A / April 2018
Handling precautions
•Always grasp the card by the side edges and covers. Do not touch the board surfaces or
components.
•When the card is not installed in a multimeter, keep the card in the anti-static bag and store it in
the original packing carton.
•After removing the card from its anti-static bag, inspect it for any obvious signs of physical
damage. Report any such damage to the shipping agent immediately.
Factory service
To return the scanner card to Keithley Instruments for repair:
•Call the Repair Department at 1-800-833-9200 or send an email to
[email protected] for a Return Material Authorization (RMA) number.
•Carefully pack the instrument in the original packing carton.
•Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label.

In this section:
Introduction .............................................................................. 2-1
Installation handling precautions.............................................. 2-1
Board cleaning......................................................................... 2-1
Connections............................................................................. 2-2
Typical connecting schemes.................................................... 2-6
Card installation and removal................................................. 2-10
Introduction
This section includes information on making connections to the 2000-SCAN Scanner Card and
installing the scanner card in a DMM6500.
The information in this topic is intended only for qualified service personnel. Some of the
procedures may expose you to hazardous voltages that could result in personal injury or
death. Do not attempt to perform these procedures unless you are qualified to do so.
Installation handling precautions
To maintain high-impedance isolation between channels, avoid contamination from foreign materials
as body oils when handling the scanner card. Contamination can substantially lower leakage
resistances, degrading card performance. To avoid possible contamination, always hold the scanner
card by the side edges or covers. Do not touch board surfaces, components, or areas adjacent to
electrical contacts.
Dirt build-up over a period of time is another possible source of contamination. To avoid this problem,
operate the multimeter and scanner card in a clean environment.
Board cleaning
The circuit board should be thoroughly cleaned with pure water after soldering to remove all
contaminants. After cleaning with water, swab the area with pure methanol and allow the board to dry
for several hours in a 50 °C environment before use.
Section 2
Card connections and installation

Section
2: Card connections and installation Model 2000-SCAN Scanner Card
User's Manual
2-2 2000-SCAN-900-01 Rev. A / April 2018
Connections
This section provides information on connecting your external test circuitry to the scanner card.
Failure to observe the following precautions may result in degraded card performance.
Connection precautions
Connection and wiring procedures in this document are intended for use by qualified
personnel only. Do not perform these procedures unless qualified to do so. Failure to
recognize and observe normal safety precautions could result in personal injury or death.
Do not attempt to perform this procedure unless qualified to do so. Failure to recognize and
observe normal safety precautions could result in personal injury or death.
Do not exceed the maximum specifications for the 2000-SCAN Scanner Card. Refer to the
specifications provided in the data sheet. Failure to recognize and observe normal safety
precautions could result in personal injury or death.
As described in the International Electrotechnical Commission (IEC) Standard IEC 664,
scanner cards are Installation Category I and must not be connected to mains.
To prevent electric shock that could result in serious injury or death, make sure the DMM
power is turned off and power is removed from all external circuitry before making or
breaking connections to the scanner card.
Card configurations
The following figure shows a simplified diagram of the 2000-SCAN. The scanner card has 10 input
channels and two outputs. Channels 1 to 10 are all switched by the relays.
4-pole paired channels are as follows:
•Channels 1 and 6
•Channels 2 and 7
•Channels 3 and 8
•Channels 4 and 9
•Channels 5 and 10

Model 2000
-SCAN Scanner Card User's Manual Section 2:
Card connections and installation
2000-SCAN-900-01 Rev. A / April 2018 2-3
Figure 1: Simplified schematic

Section
2: Card connections and installation Model 2000-SCAN Scanner Card
User's Manual
2-4 2000-SCAN-900-01 Rev. A / April 2018
Card connectors
The following figure shows the input and output connectors for the card. Card connectors include:
•CH 1 to 10 (channels 1 to 10): HI and LO input terminals provided for each of the 10 channels on
the card.
•OUT A: HI and LO output connections for all 10 channels in 2-pole mode or channels 1 to 5 in
4-pole mode.
•OUT B: HI and LO output connections for channels 6 to 10 in 4-pole mode.
To access the connectors, open the plastic shield by pressing in the locking tab, and swing the shield
away from the circuit board.
Figure 2: Card connectors

Model 2000
-SCAN Scanner Card User's Manual Section 2:
Card connections and installation
2000-SCAN-900-01 Rev. A / April 2018 2-5
Output connections
When making output connections from your 2000-SCAN to a DMM6500, use the supplied test leads
for scanner output connections.
To make output connections to your DMM6500:
1. Connect the red leads to the output (OUT A and OUT B) HI terminals.
2. Connect the black leads to the output LO terminals. See the following figure for details.
3. Dress the output test leads through the cable clamp.
4. After all wires are connected and secure, close the plastic shield, and secure it with the locking
tab.
Figure 3: Output connections
Wiring procedures
Before connecting or disconnecting wires, all power must be off and stored energy in
external circuitry discharged.

Section
2: Card connections and installation Model 2000-SCAN Scanner Card
User's Manual
2-6 2000-SCAN-900-01 Rev. A / April 2018
Mechanical shock may open or close latching relays on the scanner card. Before enabling
any external sources, open all relays by inserting the 2000-SCAN into the multimeter and
turning on the power.
To wire the circuitry to the screw terminals on the scanner card:
1. To access the connectors, open the plastic shield.
2. Strip approximately 7.93 mm (5/16 in.) of insulation from the end of each wire.
3. Twist the strands of the wire together.
#22 AWG stranded wire is recommended for scanner card connections.
4. Loosen the screw terminal.
5. Insert the wire into the access hole.
6. While holding the wire in place, tighten the connector screw securely.
7. Repeat the above steps until all wires are connected.
8. Dress input wires through the cable clamp.
Dressing leads
After the wires are connected to the terminal blocks, they should be dressed through the cable clamp
as shown in the figure below. Unlatch the clip that holds the cable clamp together, then route all wires
flat against the lower half of the clamp. Clamp the wires down, then secure the clamp with the
unlatched metal clip.
Figure 4: Routing wires through the cable clamp

Model 2000
-SCAN Scanner Card User's Manual Section 2:
Card connections and installation
2000-SCAN-900-01 Rev. A / April 2018 2-7
Typical connecting schemes
This section discusses typical connections for the scanner card.
Voltage connections
The figure below shows typical connections for voltage measurements. Note that all channels are
used in the 2-pole mode and that up to 10 voltage sources can be switched with this configuration.
This basic configuration can be used for the following types of measurements:
•DCV
•ACV
•Frequency (voltage only)
•Digitize voltage
Figure 5: Connections for voltage scanning

Section
2: Card connections and installation Model 2000-SCAN Scanner Card
User's Manual
2-8 2000-SCAN-900-01 Rev. A / April 2018
Resistance connections
Making 2-pole connections
The following figure shows typical 2-pole resistor connections. The 2-pole resistance configuration
can be used to test up to ten devices under test (DUTs).
Figure 6: Typical connections for 2-wire resistance scanning

Model 2000
-SCAN Scanner Card User's Manual Section 2:
Card connections and installation
2000-SCAN-900-01 Rev. A / April 2018 2-9
Making 4-pole connections
Typical 4-pole resistance connections are shown in the following figure. This general configuration
can be used with all channels to scan:
•4-wire resistance measurements
•4-wire RTD temperature measurements
Figure 7: Typical connections for 4-wire resistance scanning

Section
2: Card connections and installation Model 2000-SCAN Scanner Card
User's Manual
2-10 2000-SCAN-900-01 Rev. A / April 2018
Card installation and removal
This section explains how to install and remove the 2000-SCAN scanner card from the DMM6500. All
wiring connections must be complete before installing the 2000-SCAN.
The information in this topic is intended only for qualified service personnel. Some of the
procedures may expose you to hazardous voltages that could result in personal injury or
death. Do not attempt to perform these procedures unless you are qualified to do so.
To prevent electric shock that could result in injury or death, never handle a scanner card
that has power applied to it. Before installing or removing a scanner card, make sure the
2000-SCAN is turned off and disconnected from line power. If the scanner card is connected
to a DUT, make sure power is removed from all external circuitry.
If a card slot is unused, you must install slot covers to prevent personal contact with high
voltage circuits. Failure to install slot covers could result in personal exposure to hazardous
voltages, which could cause personal injury or death if contacted.
If you have a 2000-SCAN or 2001-TCSCAN that was used in another Keithley Instruments product,
such as the Model 2000, you can use your existing scan cards in the DMM6500. Follow the
instructions in your original equipment documentation to remove the card from the instrument, then
use the following instructions to install it in the DMM6500. You do not need to remove the wiring to
the card.
For inexperienced users, it is recommended that you do not connect a device under test (DUT) and
external circuitry to the scanner card. This allows you to exercise close and open operations without
the dangers associated with live test circuits. You can also set up pseudocards to experiment with
switching.
Select the rear inputs with the multimeter front-panel TERMINALS switch when using the scanner
card.

Model 2000
-SCAN Scanner Card User's Manual Section 2:
Card connections and installation
2000-SCAN-900-01 Rev. A / April 2018 2-11
Scanner card installation
Turn off power to all instruments (including the multimeter), and disconnect all power cords.
Make sure all power is removed and any stored energy in external circuitry is discharged.
To prevent contamination of the 2000-SCAN that could degrade performance, handle the scanner
card by the edges and covers only.
The figure below demonstrates the 2000-SCAN installation.
Figure 8: Unlock card

Section
2: Card connections and installation Model 2000-SCAN Scanner Card
User's Manual
2-12 2000-SCAN-900-01 Rev. A / April 2018
Figure 9: Lock card
To install your 2000-SCAN:
1. Remove power from the DMM6500.
2. Disconnect the power cord and any other cables that are connected to the rear panel.
3. Remove the cover plate from the Accessory Card Slot on the rear panel of the multimeter. To do
so, move the tab on the cover plate up and out.
4. Slide the card edges into the guide rails inside the multimeter.
5. With the ejector arms in the unlocked position, carefully push the card all the way forward until the
arms engage the ejector clips. Push both arms inward to lock the scanner card into the
multimeter.
6. After installing your scanner card, make your output connections.