Keithley 7001 User manual

Model 7001 Switch System
Quick Reference Guide
A GREATER MEASURE OF CONFIDENCE

Model 7001 Switch System
Quick Reference Guide
 1992, Keithley Instruments, Inc.
All rights reserved.
Cleveland, Ohio, U.S.A.
Document Number: 7001-903-01 Rev. A

Table of Contents
Safety Precautions.......................................................1
Introduction ................................................................ 5
Operation Summary....................................................6
Menu Structures.........................................................11
Default Conditions....................................................16
Error and Status Messages .........................................19
IEEE-488.2 Common Commands and Queries...........25
SCPI Command Subsystems ...................................... 27

1
Safety Precautions
The following safety precautions should be observed before
using this product and any associated instrumentation. Al-
though 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 pre-
cautions required to avoid possible injury. Read the operat-
ing information carefully before using the product.
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, for example, setting the line
voltage or replacing consumable materials. Maintenance
procedures are described in the manual. The procedures ex-
plicitly 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.
Keithley products are designed for use with electrical signals
that are rated Installation Category I and Installation Catego-
ry II, as described in the International Electrotechnical Com-
mission (IEC) Standard IEC 60664. Most measurement,
control, and data I/O signals are Installation Category I and
must not be directly connected to mains voltage or to voltage
sources with high transient over-voltages. Installation Cate-
gory II connections require protection for high transient

2
over-voltages often associated with local AC mains connec-
tions. The user should assume all measurement, control, and
data I/O connections are for connection to Category I sources
unless otherwise marked or described in the Manual.
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.
Users 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 poten-
tial 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.
Do not connect switching cards directly to unlimited power
circuits. They are intended to be used with impedance limit-
ed 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, 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 before each use.
When installing equipment where access to the main power
cord is restricted, such as rack mounting, a separate main in-
put power disconnect device must be provided, in close prox-
imity 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 sys-
tem and discharge any capacitors before: connecting or dis-
connecting cables or jumpers, installing or removing

3
switching cards, or making internal changes, such as install-
ing 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 with-
standing the voltage being measured.
The instrument and accessories must be used in accordance
with its specifications and operating instructions or the safety
of the equipment may be impaired.
Do not exceed the maximum signal levels of the instruments
and accessories, as defined in the specifications and operat-
ing information, and as shown on the instrument or test fix-
ture panels, or switching card.
When fuses are used in a product, replace with same type and
rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections
for measuring circuits, NOT as safety earth ground connec-
tions.
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 safety earth ground
using the wire recommended in the user documentation.
The symbol on an instrument indicates that the user
should refer to the operating instructions located in the man-
ual.
The symbol on an instrument shows that it can source
or measure 1000 volts or more, including the combined ef-
fect of normal and common mode voltages. Use standard
safety precautions to avoid personal contact with these volt-
ages.
The
WARNING heading in a manual explains dangers that
might result in personal injury or death. Always read the as-
!

4
sociated 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.
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, replace-
ment components in mains circuits, including the power
transformer, test leads, and input jacks, must be purchased
from Keithley Instruments. Standard fuses, with applicable
national safety approvals, may be used if the rating and type
are the same. 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 Instruments
to maintain accuracy and functionality of the product.) If you
are unsure about the applicability of a replacement compo-
nent, call a Keithley 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 ap-
ply 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., data acquisition board for
installation into a computer) should never require cleaning if
handled according to instructions. If the board becomes con-
taminated and operation is affected, the board should be re-
turned to the factory for proper cleaning/servicing.
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.

5
Introduction
This quick reference guide includes summary informa-
tion on front panel and IEEE-488 operation for the
Model 7001 Switch System. For detailed information,
consult the Model 7001 Instruction Manual.

6
Operation Summary
Channel List and Scan List
A Channel List specifies the channels to be closed or
opened, and a Scan List specifies the channels to be
scanned. Each channel in the list is made up of either a
two integer CHANNEL number (for non-matrix type
cards) or a three integer CHANNEL number (for matrix
type cards). Examples:
1!2 = Slot 1, Channel 2
2!4 = Slot 2, Channel 4
1!2!3 = Slot 1, Row 2, Column 3
2!3!6 = Slot 2, Row 3, Column 6
Front panel operation
A Channel List is created with the SELECT CHANNELS
prompt displayed, and a Scan List is created with the
SCAN CHANNELS prompt displayed. The SCAN LIST
key toggles the display between the Channel List and
the Scan List.
Channels are entered into a Channel List and Scan List
using the keypad. The following examples demonstrate
proper format.
SELECT CHANNELS 1!1, 1!5-1!10, 2!1!1, M1,
SCAN CHANNELS 1!10-1!1, 2!1!3, M1,
Each entry is separated by a comma (,) which is inserted
by pressing the right cursor key ( ) or the ENTER key.
Notice that a comma is also used to terminate the list. A
channel range is specified by separating the range limits

7
with a hyphen (-). The M1 entry represents a channel
pattern that is stored in memory (see STORE and
RECALL).
Edit keys  Alist can also be modified by using the edit
keys; DELETE and INSERT. A channel entry can be
deleted by placing the cursor on the desired entry and
pressing DELETE. To insert an entry, press INSERT
(INSERTING ENTRY displayed), place the cursor at the
appropriate location, and key in the new entry. Make
sure to insert a comma after keying in the channel entry.
When finished, press INSERT again to cancel the insert
function.
IEEE-488 bus operation
Over the bus, the Channel List is included with the
commands that are used to close or open channels. See
Closing and Opening Channels. The Scan List is created
using the :SCAN command. The following example
demonstrates proper format:
:SCAN (@ 1!10:1!1, 2!1!3, M1)
Note that range limits are separated by a colon (:), and
the last channel entry in the list is not terminated with a
comma.
Closing and Opening Channels
Front panel operation
Channels specified in the Channel List are closed by
pressing the CLOSE key. Channels specified in the
Channel List are opened by pressing the OPEN key.

8
Note that the OPEN ALL key will open all channels,
including those not specified in the Channel List.
IEEE-488 bus operation
Over the bus, the :CLOSe and :OPEN commands are
used to control channels. Note that the Channel List is
included with the following examples:
:CLOSe (@ 1!1, 1!5:1!10, 2!1!1, M1)
:OPEN (@ 1!1, 1!5:1!10, 2!1!1, M1)
Note that a colon (:) is used to separate range limits, and
a comma is not used to terminate the list. The following
command is analogous to the front panel OPEN ALL key
and will simply open all channels:
:OPEN ALL
Scanning Channels
Channels are scanned in the order that they are pre-
sented in the Scan List.
Front panel operation
To perform a scan, first program the controlling aspects
of the scan (see Table 2), and then press STEP to take the
Model 7001 out of the idle state (ARM indicator on).
Regardless of how the scan is configured, the STEP key
is always active allowing you to manually step through
the scan.

9
The scan can be terminated at any time by pressing the
OPEN ALL key. All closed channels will open and the
Model 7001 will return to the idle state (ARM indicator
off).
IEEE-488 operation
Over the bus, a scan is configured using the :TRIGger
subsystem commands.
Send the following command to take the Model 7001
out of the idle state and begin a scan:
:INITiate
The scan can be terminated by sending the following
command:
:ABORt
All closed channels will open and the Model 7001 will
return to the idle state.
Store and Recall
Up to 100 channel patterns can be stored in memory. A
channel pattern is simply a displayed pattern of open
and closed channels.
Front panel operation
1. Close the desired channels.
2. Press STORE and enter the desired memory loca-
tion (1 to 100).
3. Press ENTER.

10
To recall a channel pattern from memory:
1. Press RECALL and enter the memory location of the
stored channel pattern.
2. Press ENTER. The channel status display will imme-
diately update to reflect the recalled channel pat-
tern.
Another way to recall a channel pattern is to include a
memory location (e.g. M36) in a Channel List and/or
Scan List. In a Channel List, when CLOSE is pressed, the
closed channels in the specified channel pattern will
close, and when OPEN is pressed, the channels will
open. In a Scan List, when the memory location is
scanned, the channel status display will update to
reflect the specified channel pattern. The closed chan-
nels in the channel pattern will remain closed unless a
different channel pattern is scanned.
IEEE-488 bus operation
Over the IEEE-488 bus, the :SAVe and :RECall com-
mands are used to save (store) and recall channel pat-
terns. The following examples demonstrate proper
format:
:MEMory:SAVe M36
:MEMory:RECall M36
As in front panel operation, a memory location can be
included in the Channel List and/or Scan List.

11
Menu Structures
The desired menu is displayed by pressing the appropri-
ate key; MENU, SCAN CONFIGURATION or CARD
CONFIGURATION. Once in a menu structure, place
the cursor ( and keys) on the desired selection and
press ENTER. Use the keypad to enter parameters. Use
the EXIT key to back out of the menu structure and dis-
able the menu.
Table 1: MAIN MENU structure
Menu item Description
SAVESETUP
SAVE
RESTORE
PWRON
FACTORY DEFAULT
USER SETUP
RESET
Setup Menu:
Save setup at a memory location
(up to 10).
Return 7001 to setup stored at a
memory location.
Power-on Menu:
Power-on to factory default
setup conditions.
Power-on to setup stored at a
memory location.
Return 7001 to original power
on setup.
GPIB
ADDRESS
STATUS
GPIB Setup Menu:
Check/change IEEE-488 address.
Display IEEE-488 status byte.
DIGITAL-I/O
OUTPUT-STATUS
OUTPUT-POLARITY
INPUT-STATUS
Digital I/O Menu:
Check/change states of digital
output channels.
Check/change polarity of digital
output port.
Read digital input channel.

12
TEST
BUILT-IN TESTS
AUTO
MANUAL
DISPLAY TESTS
KEYS
PATTERNS
Self-Test Menu:
Test Digital Board:
Run all tests automatically
Select tests to run
Test Display Board:
Verify operation of front panel
keys
Verify operation of display
LANGUAGE
ENGLISH
GERMAN
FRENCH
Choose Language:
Display messages in English.
Display messages in German.
Display messages in French.
GENERAL
SERIAL #
STATUS-MESSAGES
General Menu:
Displays serial number, SCPI ver-
sion, and software revision.
Enables/disables status message
mode.
Table 2: CONFIGURE SCAN menu structure
Menu item Description
CHAN-CONTROL
CHANNEL-SPACING
TIMER
EXTERNAL
GPIB
MANUAL
TRIGLINK
Configure Channel Layer:
Select channel spacing:
Use a timer to select each chan-
nel in the scan.
Use an external trigger to select
each channel.
Use a bus trigger to select each
channel.
Use STEP key to select each
channel.
Use a Trigger Link trigger to
select each channel.
Table 1: MAIN MENU structure (Cont.)
Menu item Description

13
ASYNCHRONOUS
SEMI-SYNCHRONOUS
IMMEDIATE
HOLD
NUMBER-OF-CHANS
USE-SCANLIST-LENGTH
CHAN-COUNT
INFINITE
ENTER-CHAN-COUNT
CONTROL
SOURCE
ACCEPTOR
Use separate lines for In/Out
triggers.
Use same line for In/Out trig-
gers.
Use to scan channels immedi-
ately.
Use to hold up the scan in the
channel layer.
Define number of channels to
scan:
Count = number of channel
entries in scan list.
User defined count:
Repeat channel scanning
indefinitely.
Count = user defined value (1
to 9999)
Select trigger control mode:
Enable the Source Bypass.
Disable the Source Bypass.
SCAN-CONTROL
SCAN-SPACING
TIMER
EXTERNAL
GPIB
MANUAL
TRIGLINK
IMMEDIATE
HOLD
NUMBER-OF-SCANS
INFINITE
ENTER-SCAN-COUNT
Configure Scan Layer:
Select scan spacing:
Use the timer to control scan
spacing.
Use external triggers to control
scan spacing.
Use bus triggers to control scan
spacing.
Use STEP key to control scan
spacing.
Use Trigger Link triggers to con-
trol scan spacing.
Use to pass operation immedi-
ately into the channel layer.
Use to hold up the scan in the
scan layer.
Define number of scans to be per-
formed:
Repeat scan indefinitely.
Count = user defined value (1 to
9999).
Table 2: CONFIGURE SCAN menu structure (Cont.)
Menu item Description

14
CONTROL
SOURCE
ACCEPTOR
Select trigger control mode:
Enable Source Bypass.
Disable Source Bypass.
ARM-CONTROL
ARM SPACING
MANUAL
IMMEDIATE
GPIB
EXTERNAL
TRIGLINK
HOLD
ARM-COUNT
INFINITE
ENTER-ARM-COUNT
TRIGGER-CONTROL
SOURCE
ACCEPTOR
Configure Arm Layer:
Select arm spacing control:
Use STEP key to arm scanner.
Use to arm scanner immediately.
Use a bus trigger to arm scanner.
Use an external trigger to arm
scanner.
Use a Trigger Link trigger to arm
scanner.
Use to hold up the scan in the
arm layer.
Define number of times to arm
scanner:
Continuously re-arm scanner.
User defined count value (1 to
9999).
Select trigger control mode:
Enable Source Bypass.
Disable Source Bypass.
CHAN-RESTRICTIONS
SINGLE-CHAN
RESTRICTED-CHANNELS
Define channel restrictions:
Enable/disable Single Channel
Mode.
Specify channels that cannot be
closed.
Table 2: CONFIGURE SCAN menu structure (Cont.)
Menu item Description

15
Table 3: CARD CONFIG MENU structure
Menu item Description
TYPE
SLOT-1
SLOT-2
Set Card Type:
Assign model number to card in slot 1.
Assign model number to card in slot 2.
#-OF-POLES
SLOT-1
SLOT-2
Select # Of Poles:
Select pole mode for card in slot 1.
Select pole mode for card in slot 2.
CARD-PAIR Enable or disable Card Pair.
DELAY
SLOT-1
SLOT-2
Set Delay For:
Set delay for card in slot 1.
Set delay for card in slot 2.
READ-I/O-CARD Identify I/O Cards.

16
Default Conditions
Table 4: Factory default and RESET
Item Factory default RESET
Channel status All open All open
Channel list Cleared No change
Scan list Cleared No change
GPIB address 7 No change
Digital I/O output
level High High
Language English No change
Status messages Off Off
# of poles 2-pole (both slots) No change
Card pair Off Off
Delay 0 sec 0 sec
Channel spacing Manual (STEP key) Manual (STEP key)
Number of channels Scan list length Scan list length
Channel trigger con-
trol Source Source
Scan spacing Immediate Immediate
Number of scans Infinite Infinite
Scan trigger control Acceptor Acceptor
Arm spacing Immediate Immediate
Arm count 1 1
Arm trigger control Acceptor Acceptor
Single channel Off Off
Restricted channels None No change
Note: “No change” indicates that RESET does not affect the currently set condi-
tion.

17
Table 5: *RST and :SYSTem:PRESet
Command name *RST value :SYSTem:PRESet value
:INITiate
:CONTinuous
:ARM
:SEQuence[1]
:LAYer[1]
:COUNt
:SOURce
:TCONfigure
:DIRection
:ASYNchronous
:ILINe
:OLINe
:LAYer2
:COUNt
:DELay
:SOURce
:TIMer
:TCONfigure
:DIRection
:ASYNchronous
:ILINe
:OLINe
:TRIGger
:SEQuence1
:COUNt
:AUTO
:DELay
:SOURce
:TIMer
:TCONfigure
:PROTocol
:DIRection
:ASYNchronous
:ILINe
:OLINe
:SSYNchronous
:LINE
OFF
1
IMMediate
ACCeptor
1
2
1
0
IMMediate
0.001
ACCeptor
1
2
1
OFF
0
IMMediate
0.001
ASYNchronous
ACCeptor
1
2
1
OFF
1
IMMediate
ACCeptor
1
2
INFinite
0
IMMediate
0.001
ACCeptor
1
2
Scan list length
ON
0
MANual
0.001
ASYNchronous
SOURce
1
2
1