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Series 2600B
Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
1-888-KEITHLEY
http://www.keithley.com
Safety Supplement
Introduction
The purpose of this supplement is to provide you with basic installation, front panel, and rear panel information
to help you start using your Keithley Instruments Series 2600B instrument safely.
For detailed information about these topics, refer to the Reference Manual on the Product Information CD-ROM
that came with your instrument.
General ratings
The Series 2600B instrument's general ratings and connections are listed in the following table.
Category Specification
Supply voltage range
Models: 2601B/2602B/2604B
Supply voltage range
Models: 2611B/2612B/2614B
2634B/2635B/2636B
100 V AC to 240 V AC, 50 Hz or 60 Hz (autosensing); 240 VA
maximum.
100 V AC to 240 V AC, 50 Hz or 60 Hz (autosensing); 250 VA
maximum.
Input and output connections See Front panel (on page 3) and Rear panel (on page 7).
Environmental conditions
For indoor use only:
Altitude: Maximum 2000 meters (6562 feet) above sea level.
Operating: 0 °C to 50 °C (32 °F to 122 °F), 70 % relative humidity up to
35 °C. Derate 3 % relative humidity/°C, 35 °C to 50 °C (95 °F to
122 °F). Power output is derated by one watt per channel for each
degree Celsius above 30 °C (86 °F) up to 50 °C (122 °F) and at up to
70 % relative humidity.
Storage: −25 °C to 65 °C (−13 °F to 149 °F).
Maximum mains transient overvoltage category II.
Terminals shall not be used for measurements within the measurement
categories CAT II, CAT III, and CAT IV. Input measurement terminals
shall also be protected from drawing more than maximum rated current
when connecting to an external source.
Pollution degree: 1 or 2.
Electrical rating
Source input
Models: 2601B, 2602B, and 2604B Models: 2611B, 2612B, 2614B, 2634B,
2635B, and 2636B
Voltage
Current
40 V DC maximum 200 V DC maximum
3 A maximum at 6 V DC, 1 A maximum at
40 V DC
1.5 A maximum at 20 V DC, 0.1 A
maximum at 200 V DC
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Series 2600B
Measuring input
Models: 2601B, 2602B, and 2604B Models: 2611B, 2612B, 2614B, 2634B,
2635B, and 2636B
Voltage
Current
Impedance
40 V DC maximum HI to LO, 250 V DC LO to
ground
3 A maximum at 6 V DC, 1 A maximum at
40 V DC
Variable Variable
200 V DC maximum HI to LO, 250 V DC LO
to ground
1.5 A maximum at 20 V DC, 0.1 A
maximum at 200 V DC
Requirements
Supply connection and grounding requirements
Before operating an instrument, ensure that the line cord is connected to a properly grounded, appropriately
rated 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.
Assembly, location, and mounting requirements
The Series 2600B System SourceMeter instruments® can be mounted in a standard 19-inch rack (horizontal
mountings only; mounting vertically may impede the cooling mechanisms).
When rack mounting the Series 2600B, make sure there is adequate airflow around at least one side to ensure
proper cooling. Adequate airflow enables air temperatures within approximately one inch of the Series 2600B
surfaces to remain within specified limits under all operating conditions. The cooling specifications state:
• Forced air
• Side intake, rear exhaust
• One side must be unobstructed when rack-mounted
Ventilation requirements
To prevent damaging heat build-up and ensure specified performance, observe to the following
precautions:
The rear exhaust vent and at least one side vent must be kept free of any obstructions. Even partial blockage
could impair proper cooling.
• DO NOT position any devices adjacent to the Series 2600B that force air (heated or unheated) into or onto
its cooling vents or surfaces. This additional airflow could compromise accuracy performance.
• When rack mounting the Series 2600B, make sure there is adequate airflow around at least one side to
ensure proper cooling. Adequate airflow enables air temperatures within approximately one inch of the
Series 2600B surfaces to remain within specified limits under all operating conditions.
• DO NOT rack-mount high power-dissipation equipment adjacent to the Series 2600B that could cause
excessive heating to occur. The specified ambient temperature must be maintained around the surfaces of
the Series 2600B to maintain specified accuracies.
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Series 2600B
Power switch. The in position turns the Series 2600B on (I); the out position turns it off (O).
Toggles between the various source-measure displays and the user message mode.
Configures a function or operation.
Front panel
The front panel of the Series 2600B is shown below. The descriptions of the front-panel controls, USB port, and
indicators follow the figure.
Figure 1: Front panel (Series 2600B models)
1. Power switch, display and configuration keys
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Series 2600B
Places the cursor in the compliance limit field for editing. Also selects the limit value to edit (V, A,
Selects a meter mode (I-METER, V-METER, OHM-METER, or WATT-METER).
Sets the display resolution (4½, 5½, or 6½ digits).
Sets the measurement speed (FAST, MEDium, NORMAL, HI-ACCURACY, or OTHER). Speed
and accuracy are set by controlling the measurement aperture.
Enables or disables the digital filter. You can use this filter to reduce reading noise.
Runs the last selected factory or user-defined test.
Accesses reading buffers and takes readings. TAKE_READINGS: Use to take readings and store
values, and timestamp values, if configured.
Recalls information (DATA or STATISTICS) stored in a reading buffer: DATA includes stored
STD DEV, SAMPLE SIZE, MINIMUM, MAXIMUM, PK-PK.
Accesses the main menu. The main menu can be used to configure many functions and features.
Cancels the selection and returns to the previous menu or display. Also used as a LOCAL key to
take the instrument out of remote operation.
2. SMU setup, performance control, special operation, and numbers
SMU (source-measure unit) setup
SRC
MEAS
LIMIT
MODE
Selects the source function (V or A) and places the cursor in the source field for editing.
Cycles through measure functions (V, A, Ω, or W).
or W).
Performance control
DIGITS
SPEED
REL
FILTER
Special operation
LOAD
RUN
STORE
Controls relative measurements, which allows a baseline value to be subtracted from a reading.
Loads test for execution (FACTORY, USER, or SCRIPTS).
them in a reading buffer. SAVE: Use to save a reading buffer to nonvolatile memory or to a
user-installed flash drive (USB1) in CSV or XML format. Readings include measurements, source
RECALL
TRIG
MENU
EXIT
ENTER
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readings, and if configured, source values and timestamp values; STATISTICS includes MEAN,
Triggers readings.
Accepts the selection and moves to the next choice or exits the menu.
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Series 2600B
When enabled and in EDIT mode, the number keys (0-9, +/-, 0000) allow
Selects the next lower source or measure range.
In addition to selecting range functions, the up and down range keys change the format for
Use the CURSOR keys to move the cursor left or right. When the cursor is on the desired source
value or sub-menu item.
• Select a menu option or a value
Turns the source output on or off.
Number keys
direct numeric entry. Press the navigation wheel to enter EDIT mode.
3. Range keys
Selects the next higher source or measure range.
Enables or disables source or measure autorange.
non-range numbers (as an example, when editing the limit value).
4. Cursor keys
or compliance value digit, push the navigation wheel to enter edit mode, and turn the
navigation wheel to edit the value. Push the navigation wheel again when finished editing.
Use the CURSOR keys or the navigation wheel to move through menu items. To view a menu
value, use the CURSOR keys for cursor control, and then press the navigation wheel to view the
5. Navigation wheel
Turn the navigation wheel to:
• Move the cursor to the left and the right (the cursor indicates the selected value or item)
• While in edit mode, increase or decrease a selected source or compliance value
Push the navigation wheel
• Enable or disable edit mode for the selected source or compliance value
• Open menus and submenu items
6. Output control
to:
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Series 2600B
Use the USB port to connect a USB flash drive to the instrument. You can use the USB flash drive
EDIT
Instrument is in editing mode
ERR
Questionable reading or invalid calibration step
REM
TALK
Instrument is addressed to talk
LSTN
Instrument is addressed to listen
SRQ
Service request is asserted
REL
Relative mode is enabled
FILT
AUTO
Source or measure autorange is selected
* (asterisk)
Readings are being stored in the buffer
7. USB port
to store reading buffer data, scripts, and user setups. You can also use it to upgrade the firmware.
8. Display indicators (not shown)
The items listed below represent the possible display indicators and their meanings.
Indicator Meaning
Instrument is in remote mode
Digital filter is enabled
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Series 2600B
Rear panel
The rear panel of the Series 2600B is shown below. The descriptions of the rear-panel components follow the
figure.
Figure 2: Rear panel (Models 2601B, 2602B, 2611B, and 2612B)
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Series 2600B
Figure 3: Rear panel (Models 2604B and 2614B)
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Series 2600B
Figure 4: Rear panel (Models 2634B and 2635B)
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Series 2600B
Figure 5: Rear panel (Model 2636B)
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Series 2600B
This connector provides input/output connections for HI and
Exhaust vent for the internal cooling fan. Keep the vent free of obstructions to
1. SMU connector
Channel A
2601B/2602B/2604B/2611B/2612B/2614B
Channel B
2602B/2604B/2612B/2614B
Channel A
2634B/2635B/2636B
Channel B
2634B/2636B
LO, sense (S HI/S LO), and guard (G). Connections are as
follows:
LO = LO
S LO = Sense LO
G = Guard
S HI = Sense HI
HI = HI
These triaxial connectors provide input/output connections for
HI and LO, sense HI and sense LO, guard, and ground. See
connections at left. Each connector's conductors are as
follows:
* Center conductor
** Inner shield
*** Outer shield
2. Cooling exhaust vents
prevent overheating. Also see Cooling vents (on page 13).
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Series 2600B
Female DB-25 connector. Use a cable equipped with a male
DB-25 connector (Keithley Instruments part number CA-126-1).
Pins provided: Fourteen digital input or output pins, seven GND
Pins provided: One output enable pin, seven GND pins, and
Pins provided: One interlock pin, seven GND pins, and three
the Models 2614B and 2634B.
Connector for IEEE-488 (GPIB) operation. Use a shielded cable, such as the
This USB-2.0 receptacle (Type B) located on the rear panel is used to connect
3. Digital I/O
2601B/2602B/2611B/2612B/2635B/2636B
2604B
2614B/2634B
4. IEEE-488
5. LAN
pins, and three +5 V pins.
The Models 2601B and 2602B have an output enable pin. The
Models 2611B, 2612B, 2635B, and 2636B have an interlock pin.
three +5 V pins. The digital input and output pins are not
available on the Model 2604B.
+5 V pins. The digital input and output pins are not available on
Keithley Instruments Model 7007-1 or Model 7007-2.
RJ-45 connector for a local area network (LAN). The LAN interface supports
Auto-MDIX, so either a CAT-5 cross-over cable (provided), or a normal CAT-5
straight-through cable (not provided) can be used.
6. USB port
the instrument to a computer. You can use this connection to send commands to
the instrument.
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Series 2600B
Expansion interface that allows a Series 2600B and other TSP-enabled
Contains the AC line receptacle and power line fuse. The instrument can operate
Female DB-9 connector. For RS-232 operation, use a straight-through (not null
connection to the computer.
7. Ground
2601B/2602B/2604B/2611B/2612B/2614B
2635B
2634B/2636B
8. TSP-Link
instruments to trigger and communicate with each other. Use a category 5e or
higher LAN crossover cable (Keithley Instruments part number CA-180-3A).
The TSP-Link is not available on the Models 2604B, 2614B, and 2634B.
Ground jack for connecting output HI or LO to chassis ground.
Ground screw for connections to chassis ground.
Triaxial connector on ground module.
Phoenix connector on ground module.
9. Power module
on line voltages of 100 V to 240 V AC at line frequencies of 50 Hz or 60 Hz.
10. RS-232
modem) DB-9 shielded cable (Keithley Instruments Model 7009-5) for
Cooling vents
The Series 2600B has side and top intake and rear exhaust vents. One side must be unobstructed to dissipate
heat.
Excessive heat could damage the Series 2600B and degrade its performance. Only operate the Series 2600B
in an environment where the ambient temperature does not exceed 50 °C (122 °F).
Do not place a container of liquid (water or coffee, for instance) on the top cover. If it spills, the liquid may enter
the case through the vents and cause severe damage.
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Series 2600B
To prevent damaging heat build-up and ensure specified performance, use the following guidelines.
The rear exhaust vent and either the top or both side intake vents must be unobstructed to properly
dissipate heat. Even partial blockage could impair proper cooling.
DO NOT position any devices adjacent to the Series 2600B that force air (heated or unheated)
toward its cooling vents or surfaces. This additional airflow could compromise accuracy.
When rack mounting the Series 2600B, make sure there is adequate airflow around both sides to
ensure proper cooling. Adequate airflow enables air temperatures within approximately one inch of
the Series 2600B surfaces to remain within specified limits under all operating conditions.
Rack mounting high power dissipation equipment adjacent to the Series 2600B could cause
excessive heating to occur. To produce specified Series 2600B accuracies, maintain the specified
ambient temperature around the surfaces of the Series 2600B. Proper cooling practice, in rack
configurations with convection cooling only, places the hottest non-precision equipment (for example,
the power supply) at the top of the rack away from and above precision equipment (such as the
Series 2600B).
Mount precision equipment as low as possible in the rack, where temperatures are coolest. Adding
space panels above and below the Series 2600B will help provide adequate airflow.
Turning your instrument on and off
The following topics describe how to power your instrument on and off, place an instrument in standby, and
configure the line frequency.
Procedure
The Series 2600B operates from a line voltage of 100 V to 240 V at a frequency of 50 Hz or 60 Hz. Line voltage
is automatically sensed (there are no switches to set). Make sure the operating voltage in your area is
compatible.
Follow the procedure below to connect the Series 2600B to line power and turn on the instrument.
Operating the instrument on an incorrect line voltage may cause damage to the instrument, possibly
voiding the warranty.
To turn a Series 2600B on and off:
1. Before plugging in the power cord, make sure that the front panel POWER switch is in the off (O) position.
2. Connect the female end of the supplied power cord to the AC receptacle on the rear panel.
3. Connect the other end of the power cord to a grounded AC outlet.
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Series 2600B
The power cord supplied with the Series 2600B contains a separate protective earth (safety
ground) wire for use with grounded outlets. When proper connections are made, the
instrument chassis is connected to power-line ground through the ground wire in the power
cord. In addition, a protective earth (safety ground) connection is provided through a screw
on the rear panel. In the event of a failure, not using a properly grounded protective earth
(safety ground) or grounded outlet may result in personal injury or death due to electric
shock.
4. To turn your instrument on, press the front panel POWER switch to place it in the on (I) position.
5. To turn your instrument off, press the front panel POWER switch to place it in the off (O) position.
Placing a Series 2600B in standby
Placing the Series 2600B in standby does not place the instrument in a safe state (an
Interlock is provided for this function).
When the instrument is on, the output may be placed in an active output state (output on) or a standby mode
(output off). From the front panel, pressing the OUTPUT ON/OFF control toggles the output using the present
instrument configuration. You can also place the output in standby over the remote interface by sending the
following command:
.source.output = 0
smu
X
Even though the instrument is placed in standby, the output may not be actually off.
Warmup period
The Series 2600B must be turned on and allowed to warm up for at least two hours to achieve rated
accuracies.
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Series 2600B
Line frequency configuration
The factory configures the Series 2600B to automatically detect the power line frequency (either 50 Hz or
60 Hz) at each power-up. This detected line frequency is used for aperture (NPLC) calculations.
In noisy environments, you can manually configure the instrument to match the actual line frequency.
To configure the line frequency from the front panel:
1. Press the MENU key, then turn the navigation wheel
key.
2. Turn the navigation wheel
to select the appropriate frequency and then press the ENTER key. To
configure the instrument to automatically detect line frequency at each power-up, select AUTO.
3. Press the EXIT (LOCAL) key to back out of the menu structure.
To configure the line frequency from a remote interface:
Set the localnode.linefreq or the localnode.autolinefreq attribute. The following programming
example illustrates how to set the line frequency to 60 Hz:
localnode.linefreq = 60
The following programming example illustrates how to remotely configure the instrument to automatically detect
line frequency at each power-up:
localnode.autolinefreq = true
to select LINE-FREQ, and then press the ENTER
Line fuse replacement
A fuse located on the Series 2600B rear panel protects the power line input of the instrument.
Disconnect the line cord at the rear panel and remove all test leads connected to the
instrument before replacing the line fuse. Failure to do so could expose the operator to
hazardous voltages that could result in personal injury or death.
Figure 6: Fuse replacement
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Series 2600B
100 - 240 V
250 V, 3.15 A, Slow Blow 5 x 20 mm
FU-106-3.15
To prevent injury, death, or instrument damage, use only the correct fuse type (see table).
Perform the following steps to replace the line fuse:
1. Power off the instrument and remove the line cord.
2. The fuse drawer (item 1 in the figure) is located below the AC receptacle. A small tab is located on the top
of the fuse drawer (item 2). Using a thin-bladed knife or a screwdriver, pry this tab away from the AC
receptacle.
3. Slide the fuse drawer out to gain access to the fuse (the fuse drawer does not pull completely out of the
power module).
4. Snap the fuse out of the drawer and replace it with the same type (the fuse is specified in the table below).
5. Push the fuse drawer back into the module.
If the power line fuse continues to blow, a circuit malfunction exists and must be corrected. Return the
instrument to Keithley Instruments for repair.
Line fuse
Line voltage Rating Keithley part number
System information
You can display serial number, firmware revision, and calibration dates by selecting SYSTEM-INFO from the
main menu.
To view the system information from the front panel:
1. Press the MENU key.
2. Select SYSTEM-INFO.
3. Select one of the following:
• FIRMWARE
• SERIAL#
• CAL
For remote programming, use the *IDN? query to read system information.
Beeper
The Series 2600B includes a beeper. When it is enabled, a beep indicates one of the following actions have
occurred:
• A front-panel key was pressed: A short beep, similar to a key click, is issued.
• The navigation wheel
• The output source was changed: A longer beep is issued when you press the OUTPUT ON/OFF control
(turn the output on or off).
was turned or pressed: A short beep is issued.
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Series 2600B
To turn the beeper on or off from the front panel:
1. Press the MENU key, and then select BEEPER.
2. Select one of the following:
• ENABLE
• DISABLE
To turn the beeper on or off from the TSP command interface:
Set the beeper.enable attribute. For example, to enable the beeper, send:
beeper.enable = 1
Display mode
Use the DISPLAY key to scroll through the various display modes shown in the figure below. Refer to Display
operations for more information about the display.
For the Models 2602B, 2604B, 2612B, 2614B, 2634B, and 2636B only, press the DISPLAY key more than
once to cycle through the dual channel and single channel display modes. This applies to CHANNEL A (SMU
A) and CHANNEL B (SMU B).
The Models 2601B, 2611B, and 2635B have a single channel (SMU A).
Figure 7: Display modes
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Series 2600B
Basic operation
For the Models 2611B, 2612B, 2614B, 2634B, 2635B, and 2636B, hazardous voltages may be
present on all output and guard terminals. To prevent electrical shock that could cause injury
or death, never make or break connections to the Series 2600B while the instrument is
powered on. Turn off the equipment from the front panel or disconnect the main power cord
from the rear of the Series 2600B before handling cables. Putting the equipment into standby
does not guarantee that the outputs are powered off if a hardware or software fault occurs.
Operation overview
Before you begin any of the following front panel procedures, make sure that you exit out of the
menu structure. Press the EXIT (LOCAL) key as many times as needed to return to the main
display.
Source-measure capabilities
From the front panel, the instrument can be configured to perform the following source-measure operations:
• Source voltage: Measure and display current, voltage, resistance, or power
• Source current: Measure and display voltage, current, resistance, or power
• Measure resistance: Display resistance calculated from voltage and current components of measurement
(can optionally specify source voltage or source current value)
• Measure power: Display power calculated from voltage and current components of measurement (can
optionally specify source voltage or source current value)
• Measure only (V or I): Display voltage or current measurement
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Series 2600B
Voltage and current
The following table lists the source and measure limits for the voltage and current functions.
Source-measure capabilities
Model 2601B/2602B/2604B Model 2611B/2612B/2614B Model 2634B/2635B/2636B
Range Source Measure Range Source Measure Range Source Measure
100 mV
1 V
6 V
40 V
100 nA
1 µA
10 µA
100 µA
1 mA
10 mA
100 mA
1 A
3 A
±101 mV
±1.01 V
±6.06 V
±40.4 V
±101 nA
±1.01 µA
±10.1 µA
±101 µA
±1.01 mA
±10.1 mA
±101 mA
±1.01 A
±3.03 A
±102 mV
±1.02 V
±6.12 V
±40.8 V
±102 nA
±1.02 µA
±10.2 µA
±102 µA
±1.02 mA
±10.2 mA
±102 mA
±1.02 A
±3.06 A
200 mV
2 V
20 V
1
200 V
100 nA
1 µA
10 µA
100 µA
1 mA
10 mA
100 mA
1 A
1.5 A
2
10 A
±202 mV
±2.02 V
±20.2 V
±202 V
±101 nA
±1.01 µA
±10.1 µA
±101 µA
±1.01 mA
±10.1 mA
±101 mA
±1.01 A
±1.515 A
±10.1 A
±204 mV
±2.04 V
±20.4 V
±204 V
±102 nA
±1.02 µA
±10.2 µA
±102 µA
±1.02 mA
±10.2 mA
±102 mA
±1.02 A
±1.53 A
±10.2 A
200 mV
2 V
20 V
3
200 V
100 pA
1 nA
10 nA
100 nA
1 µA
10 µA
100 µA
1 mA
10 mA
100 mA
1 A
1.5 A
4
±202 mV
±2.02 V
±20.2 V
±202 V
N/A
±1.01 nA
±10.1 nA
±101 nA
±1.01 µA
±10.1 µA
±101 µA
±1.01 mA
±10.1 mA
±101 mA
±1.01 A
±1.515 A
±204 mV
±2.04 V
±20.4 V
±204 V
±102 pA
±1.02 nA
±10.2 nA
±102 nA
±1.02 µA
±10.2 µA
±102 µA
±1.02 mA
±10.2 mA
±102 mA
±1.02 A
±1.53 A
Max Power = 40.4 W per channel Max Power = 30.603 W per channel Max Power = 30.603 W per channel
1
200 V source range available only
when interlock is enabled. See
Digital I/O.
2
10 A range available only in pulse
3
200 V source range available only when
interlock is enabled. See Digital I/O.
4
100 pA range is not available on the Model
2634B.
mode.
Basic source-measure procedure
Front-panel source-measure procedure
Use the following procedure to perform the basic source-measure operations of the Series 2600B. The
following procedure assumes that the Series 2600B is already connected to the device under test (DUT), as
explained in DUT test connections.
Hazardous voltages may be present on all output and guard terminals. To prevent electrical
shock that could cause injury or death, never make or break connections to the Series 2600B
while the instrument is powered on. Turn off the equipment from the front panel or
disconnect the main power cord from the rear of the Series 2600B before handling cables.
Putting the equipment into standby does not guarantee that the outputs are powered off if a
hardware or software fault occurs.
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Series 2600B
Step 1: Select and set the source level
Perform the following steps to select the source and edit the source value:
1. Press the SRC key as needed to select the voltage source or current source, as indicated by the units in
the source field on the display. The flashing digit (cursor) indicates which value is presently selected for
editing.
2. Move the cursor to the digit to change, then press the navigation wheel to enter the EDIT mode, as
indicated by the EDIT indicator.
3. Use the RANGE keys to select a range that will accommodate the value you want to set. See Range for
more information. For best accuracy, use the lowest possible source range.
4. Enter the source value.
5. Press the ENTER key or the navigation wheel
to complete editing.
Step 2: Set the compliance limit
Perform the following steps to edit the compliance limit value:
1. If the instrument has two channels (Models 2602B, 2604B, 2612B, 2614B, 2634B, and 2636B) and is in
dual-channel display mode, perform the following (steps a, b, and c). Otherwise, go to the next step.
a. Press the CONFIG key.
b. Press the LIMIT key and then select CURRENT or VOLTAGE.
c. Press the ENTER key or the navigation wheel
2. If the instrument has only one channel (Models 2601B, 2611B, and 2635B), or if it is a two-channel
instrument that is in single-channel display mode, press the LIMIT key.
3. Move the cursor to the digit to change, then press the navigation wheel
indicated by the EDIT indicator.
4. Enter the limit value, then press the ENTER key or the navigation wheel
.
to enter the EDIT mode, as
to complete editing.
Step 3: Select the measurement function and range
Select measurement function and range as follows:
1. If the instrument has two channels (Models 2602B, 2604B, 2612B, 2614B, 2634B, and 2636B), press the
DISPLAY key to place it in single-channel-display mode (if not already). Otherwise, go to the next step.
2. Select the measurement function by pressing the MEAS key.
3. Set the measurement range with the RANGE keys, or enable AUTO range. When setting the range,
consider the following points:
• When measuring the source (such as when sourcing V and measuring V), you cannot select the
measurement range using the RANGE keys. The selected source range determines the measurement
range.
• When not measuring the source (such as when sourcing V but measuring I), measurement range
selection can be done manually or automatically. When using manual ranging, use the lowest possible
range for best accuracy. When autorange is enabled, the Series 2600B automatically goes to the most
sensitive range to make the measurement.
Step 4: Turn the output on
Turn the output on by pressing the OUTPUT ON/OFF control. The OUTPUT indicator light switches on.
Step 5: Observe readings on the display.
Press the TRIG key if necessary to trigger the instrument to begin taking readings. The readings are on the top
line, and source and limit values are on the bottom line.
PA-1084 Rev. B / March 2013 21
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Series 2600B
Step 6: Turn the output off
When finished, turn the output off by pressing the OUTPUT ON/OFF control. The OUTPUT indicator light
switches off.
Safety concerns
This instrument can produce high current, high power outputs that can cause heating of
connectors and wires. Always use wires and connectors that are rated for the maximum
current ratings of the instrument. Failure to provide correctly rating wires and connectors can
result in a fire.
To protect sensitive devices under test, consider using external fuses or other current limiting
devices. Failure to provide current limit devices may result in damage to sensitive devices under test.
When using 4-wire (sense), if a sense lead becomes disconnected, current in excess of the
instrument ratings can flow. Consider using external resistors to connect HI to sense HI and LO to
sense LO at the instrument terminals to mitigate this risk. 100 KΩ resistors are recommended.
Contact information
If you have any questions after you review the information in this documentation, please contact your local
Keithley Instruments representative or call Keithley Instruments corporate headquarters (toll-free inside the
U.S. and Canada only) at 1-888-KEITHLEY (1-888-534-8453), or from outside the U.S. at +1-440-248-0400.
For worldwide contact numbers, visit the Keithley Instruments website (http://w ww.keithley.com
).
22 PA-1084 Rev. B / March 2013
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