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Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139-1891
1-888-KEITHLEY
www.keithley.com
Model 2450 System SourceMeter®
Version v1.3.0s Firmware Release Notes
Contents
General Information .................................................................................................................................................... 2 Supported models ................................................................................................................................................... 2 Firmware Upgrade/Downgrade Instructions ........................................................................................................... 2 Upgrade considerations for the Model 2450........................................................................................................... 3 Version v1.3.0s Release ............................................................................................................................................. 4 Overview ................................................................................................................................................................. 4 Compatibility concerns............................................................................................................................................ 4 Critical Fixes ........................................................................................................................................................... 4 Enhancements ........................................................................................................................................................ 8 Noncritical Fixes ................................................................................................................................................... 12 Known issues ........................................................................................................................................................ 12 Version v1.2.0f Release ........................................................................................................................................... 13 Overview ............................................................................................................................................................... 15 Compatibility concerns.......................................................................................................................................... 13 Critical Fixes ......................................................................................................................................................... 13 Enhancements ...................................................................................................................................................... 15 Noncritical Fixes ................................................................................................................................................... 16 Known issues ........................................................................................................................................................ 17 Version v1.1.0s Release ........................................................................................................................................... 18 Overview ............................................................................................................................................................... 18 Compatibility concerns.......................................................................................................................................... 18 Critical Fixes ......................................................................................................................................................... 18 Enhancements ...................................................................................................................................................... 21 Noncritical Fixes ................................................................................................................................................... 26 Known issues ........................................................................................................................................................ 29 Version v1.0.0i Release ............................................................................................................................................ 30 Overview ............................................................................................................................................................... 30 Compatibility concerns.......................................................................................................................................... 30 Critical fixes........................................................................................................................................................... 30 Enhancements ...................................................................................................................................................... 30 Noncritical fixes ..................................................................................................................................................... 30 Known issues ........................................................................................................................................................ 30 2450-850-FRP Rev. E / June 2015
1
General Information: Supported models
Model 2450 Firmware Release Notes
General Information
Supported models
This firmware is intended for use on the following Keithley Instruments product models:
2450, 2450-NFP, 2450-RACK, 2450-NFP-RACK
*** ATTENTION CRITICAL
ATTENTION CRITICAL
ATTENTION CRITICAL ***
If you are upgrading firmware from v1.0.0i TO ANY OTHER FIRMWARE REVISION EVER, it is critical that
firmware upgrade be run 2 TIMES in order for all firmware components to be upgraded correctly.
Firmware v1.1.0s fixes an issue with the firmware upgrade code inside the 2450 and this requires that the
upgrade be performed 2 TIMES either from the front panel or any remote upgrade process. If you are at firmware
revision v1.1.0s or later, then you only need to run firmware upgrade one time.
NOTE: When using Test Script Builder (TSB) to Flash from v1.0.0i, the same requirement applies and the
UPGRADE/DOWNGRADE option needs to be run twice.
Firmware Upgrade/Downgrade Instructions
NOTE: Do not turn off power or remove the USB flash drive until the upgrade process is complete.
From the front panel:
1. Copy the firmware upgrade file to a USB flash drive. The file is: ki_2450_v1_3_0s.upg.
2. Verify that the upgrade file is in the root subdirectory of the flash drive and that it is the only firmware upgrade
file in that location. 2450 firmware files end with the file extension .upg. (example: H:\ki_2450_v1_3_0s.upg)
3. Disconnect any input and output terminals that are attached to the instrument.
4. Turn on instrument power.
5. Insert the flash drive into the USB port on the front panel of the instrument.
6. From the instrument front panel, press the MENU key.
7. Under System, select Manage.
8. Select the type of upgrade you want to do:
To upgrade to a newer version of firmware: Select Upgrade to New.
To force downgrading to an older version of firmware: Select Downgrade to Older.
9. If the instrument is controlled remotely, a message is displayed. Select Yes to continue.
10. When the upgrade is complete, reboot the instrument.
11. If you started with firmware revision v1.0.0i, then GO TO STEP 6 and RUN STEPS 6 THROUGH 10 A
SECOND TIME
NOTE: A message is displayed while the upgrade is in progress.
For additional information about upgrading the firmware, refer to the “How do I Upgrade Firmware?” topic in the
“Frequently Asked Questions (FAQs)” section of the Model 2450 Interactive SourceMeter® Instrument Reference
Manual (document number: 2450-901-01). This manual is available online at http://www.keithley.com/support,
Search for “2450 Reference Manual” when you get there.
2
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
General Information
Upgrade considerations for the Model 2450.
ATTENTION: Once the 2450 is upgraded to v1.2.0f, the unit can NEVER be downgraded to an older firmware
version. Subsequent versions of firmware will be able to downgrade back to v1.2.0f but no earlier version.
Upgrade files are available on the Keithley Instruments website (http://www.keithley.com).
To find firmware files on the Keithley Instruments website:
1. Select the Support tab.
2. In the model number box, type 2450.
3. Select Firmware.
4. Click the search button. A list of available firmware updates and any available documentation for the
instrument is displayed.
5. Click the file you want to download.
2450-850-FRP Rev. E / June 2015
3
Version v1.3.0s Release: Overview
Model 2450 Firmware Release Notes
Version v1.3.0s Release
Overview
Version 1.3.0s is the fourth official firmware upgrade release for the Model 2450. Known Issues, Usage Notes,
and Upcoming Enhancements are listed below in this document.
Compatibility concerns
Firmware revision v1.3.0s can be installed on any vintage 2450.
Active
Buffer
Behavior
Starting with v1.3.0s, the behavior of the Active Buffer has changed. Prior to v1.3.0s, the Active Buffer
was always defbuffer1 by default. Now with v1.3.0s, the Active Buffer will be the most recently created
or selected buffer. Additionally, while graphing data, when a user creates or selects a new buffer, that
data will automatically be graphed. This feature can be disabled by manually selecting another trace
and deleting (if desired) the active trace. The user can also just select a different buffer.
Critical Fixes
PR50999 Need better indication when unit is in continuous trigger mode when set to 10PLC and 100 count
AR39793 repeat filter
Models affected:
All 2450 models
Symptom:
During some types of measurements the 2450 will appear to be stuck with no activity. The solution is
to add an animated indicator to show that measurements are still taking place and the 2450 is active.
Resolution:
This issue has been corrected. There is now an active indicator for continuous readings, even when
the reading will be coming in very slowly, the indicator displays that the test is still running.
PR51112 USBTMC: Error returned every other time status byte requested via USB
AR39909
Models affected:
All 2450 models
Symptom:
This issue was discovered after writing a Status Byte routine in LabVIEWTM which enables the user to
query the status byte in a loop. Every other time STB was requested, an error was returned.
Resolution:
This issue has been corrected.
PR51359 Resistor Sorting Trigger Model Example Incorrect
AR40280
Models affected:
All 2450 models
4
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.3.0s Release
Symptom:
The examples which are explained on page 3-78 in 2450 Reference Manual (2450-901-01 Rev. B /
September 2013) are wrong.
Resolution:
This issue has been corrected. All diagrams and coding examples have been updated and verified.
PR51544 Y-Axis units on the graph do not update properly when changing functions
AR40577
Models affected:
All 2450 models
Symptom:
When graphing measurements as a function of time, and then you change functions (say from
resistance to current), the units do not update properly on the Y-axis unless you go to one of the tabs
on screen and then go back to the Graph or if the unit auto scales.
Resolution:
This issue has been corrected.
PR51545 Unit intermittently hangs up when pressing the HOME key from the Graph Page
AR40578
Models affected:
All 2450 models
Symptom:
Intermittently when on the Graph page and then pressing the HOME key, the unit will hang up and
must be rebooted.
Resolution:
This issue has been corrected.
PR55123 Autoexec script cannot be aborted
AR42424
Models affected:
All 2450 models
Symptom:
If there is a problem with any script that has been set to run automatically at power up (autoexec), it
cannot be aborted.
Resolution:
This issue has been corrected.
2450-850-FRP Rev. E / June 2015
5
Version v1.3.0s Release: Critical Fixes
Model 2450 Firmware Release Notes
PR55188 :READ? Query always returns the last reading at the end of the continuous butter.
AR42592
Models affected:
All 2450 models
Symptom:
For example, if a basic measurement is set up to defbuffer1 (size 10000) and then takes 11000
readings, the last 1000 readings will all return the same value. This should act as a circular buffer.
Resolution:
This issue has been corrected.
PR55281 Problem with certain trigger block configurations
AR42407
Models affected:
All 2450 models
Symptom:
If setting several Notify Blocks with Line#1 as PASS signal trigger, Line#2 as FAIL signal trigger, and
Line#4 as EOT signal trigger, for example, in the Trigger Flow, you will find any single Notify Block
with Line#X would give out trigger out signals on Line#1,#2,#4 in the same time.
Resolution:
This issue has been corrected.
PR55600 *TRG command trigger source does not work in SCPI mode trigger model.
Models affected:
All 2450 models
Symptom:
Using a trigger model .wait block with the command event in SCPI does not work when *TRG is sent.
Instead, it generates the following error ==> Error 2713 - "No trigger model engine available".
Resolution:
This issue has been resolved. Now, the *TRG command will satisfy the wait block when sent if waiting
for a command event.
PR55867 1uA Current Source error when using Config List
AR43082
Models affected:
All 2450 models
Symptom:
Under a very specific sequence of events, setting the Source Config List source value to 1.0uA will
revert to 0uA after pressing the Trigger button on the front panel.
Resolution:
6
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.3.0s Release
This issue has been corrected.
PR56135 QuickSet Performance Setting does not work on fastest setting
AR50078
Models affected:
All 2450 models
Symptom:
On the QuickSet Menu, when editing the Performance Slide bar, if you choose the fastest speed, the
dial indicates a speed of ~1700/sec. However, the actual speed is only 10/sec no matter how much
the other settings are optimized. The only way to achieve this speed is to create a simple trigger
model configuration that sources, measures, and loops back continuously, then manually set NPLC to
.01, turn auto ranging for source and measure off, and set source delay to 0.
Resolution:
This issue has been corrected and the Performance Slide bar works correctly for all settings.
2450-850-FRP Rev. E / June 2015
7
Version v1.3.0s Release: Enhancements
Model 2450 Firmware Release Notes
Enhancements
GENERAL Models affected:
All 2450 models
Enhancement:
A number of improvements have been made to the overall Graphical User Interface as follows:
1. Screen Colors: All screen colors have been modified for better contrast and easier
readability.
2. Pinch-to-Zoom Performance: Throughout the user interface, the “Pinch-to-zoom” touch
screen motion has been improved and is more responsive.
3. Improve Swiping:
a. The swipe user interface gesturing has been dramatically improved and is more
responsive.
b. Added Vertical Swiping in various screens in the GUI.
c. Horizontal swiping has been made more smooth and is consistent with Vertical Swiping.
d. “Fling” swiping has been implemented where faster swiping actions result in rapid
scrolling followed by decay based on the velocity of the “fling.”
e. Swipe Down on the Home screen will display larger readings.
4. Tabs and Buttons: Throughout the user interface multiple data display options have been
made available through tabs (header bars) with swipe screen indicators to show how many
options are available and which display tab is active.
5. Graphing:
a. New Auto Scale Options (X-Axis)  Track Latest, Track Group
b. New Auto Scale Options (Y-Axis)  y-swim lanes, y-shared, y-per trace
c. Multi-Trace Line Plots
d. Multi-Trace Scatter Plots
e. Various refresh and performance improvements
8
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.3.0s Release
6. Histogram:
a. New Auto-Scale, Auto-Bin, and Fit
b. Smartscale choose best scaling option
c. Various refresh and performance improvements
7. TTI Synchronization: All Touch, Test, Invent® Keithley Models including the 2450, 2460, and
7510 have been carefully updated so that they are all consistent in look, feel, and general
navigation.
8. Updated Reading Table: Added new reading table features and a new Reading Preview
Graph. Please see the Reference Manual for further details.
PR50885 Models affected:
AR39690
All 2450 models
Enhancement:
Add a direct shortcut from the HOME view measurement line to the measurement settings menu.
A shortcut icon has been added to the swipe bar on the HOME source/measurement tab.
2450-850-FRP Rev. E / June 2015
9
Version v1.3.0s Release: Add a :TRIGger:LOAD command that takes a template name as a first argumentModel 2450 Firmwa
PR51356 Models affected:
AR40325
All 2450 models
Enhancement:
Add a CLEAR or ENTER parameter to the WAIT block of the trigger model.
The CLEAR of ENTER or NEVER was added the WAIT block on the trigger screen.
PR53815 Models affected:
All 2450 models
Enhancement:
Add a :TRIGger:LOAD command that takes a template name as a first argument
Old Command
New Command
:TRIGger:LOAD:EMPTy
:TRIGger:LOAD:CONFiguration:LIST
:TRIGger:LOAD:TRIGger:EXTernal
:TRIGger:LOAD:LOOP:SIMPle
:TRIGger:LOAD:LOOP:DURation
<not present>
<not present>
<not present>
:TRIGger:LOAD
:TRIGger:LOAD
:TRIGger:LOAD
:TRIGger:LOAD
:TRIGger:LOAD
:TRIGger:LOAD
:TRIGger:LOAD
:TRIGger:LOAD
"Empty"
"ConfigList", <parameter list as before>
"LogicTrigger", <parameter list as before>
"SimpleLoop", <parameter list as before>
"DurationLoop", <parameter list as before>
"LoopUntilEvent", <parameter list as before>
"GradeBinning", <parameter list as before>
"SortBinning", <parameter list as before>
Example:
before:
:TRIGger:LOAD:LOOP:DURation <duration>, <delay>, “<reading buffer>”
after:
:TRIGger:LOAD <duration>. <delay>, “<readingBuffer>”
Usage Notes:
o The template name is not case-sensitive
o The template name needs to be in quotes
o This makes the SCPI command more like the TSP equivalent trigger.model.load() command
o See the Reference Manual for more details
PR55190 Models affected:
AR42567
All 2450 models
Enhancement:
Change the Voltmeter default source range from 10uA to 10mA.
It order to speed things up, and to better measure voltages on more inductive loads, the default source
range for the Voltmeter QuickSet has been changed from 10uA to 10mA.
10
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.3.0s Release
PR56127 Models affected:
All 2450 models
Enhancement:
Add an API command to mark the start of a group for writable buffers.
A status optional parameter has been added to the following TSP and SCPI commands:
SCPI
TRACe:WRITe:READing <standard writable reading buffer>, <reading value>,
[<time sec>, <time nsec>,[<status>]]
TRACe:WRITe:READing <full writable reading buffer>, <reading value>,
<extra value>, [<time sec>, <time nsec>,[<status>]]
TSP
buffer.write.reading(<standard writable reading buffer>, <reading value>,
[<time sec>, <time nsec>], [<status>])
buffer.write.reading(<full writable reading buffer>, <reading value>,
<extra value>, [<time sec>, <time nsec>],[<status>])
The optional status parameter indicates if the reading being added is start of group for plotting on the
graph. The default is 0. Set this to 0 if not start of group or set to 256 if start of group. This
parameter only accepts 0 or 256 - any other value generates an error. For TSP,
buffer.STAT_START_GROUP can be used to set it. You would set status to 256 to help graph a
family of curve traces on the graph.
2450-850-FRP Rev. E / June 2015
11
Version v1.3.0s Release: Noncritical Fixes
Model 2450 Firmware Release Notes
Noncritical Fixes
PR50249 Models affected:
All 2450 models
Symptom:
GPIB: The SRQ annunciator does not get lit for GPIB, works ok for USB and VXI-11.
Resolution:
This issue has been corrected.
PR50426 Models affected:
All 2450 models
Symptom:
Clearing Limit 2 will clear the Limit 1 annunciator on the display instead of the Limit 2 annunciator.
Resolution:
This issue has been corrected.
Known issues
PR56487 Calling tsplink.initialize() under specific conditions can cause slave to lockup.
Models affected:
All 2450 models
Symptom:
Attempting to initialize TSP-Link using tsplink.initialize() may result in the following error
being reported:
TSP-Error 1202: Link initialization failed
One or more of the slave instruments may lockup.
Workaround:
Workaround #1  One workaround is to only initialize the TSP-Link connection once. The link state
can be checked by querying the tsplink.state attribute. If the link state is reported to be "online",
then do not initialize the link again.
Workaround #2  Make sure that the controlling TSP node is NOT a 2450.
12
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.2.0f Release
Version v1.2.0f Release
Compatibility concerns
Firmware revision v1.2.0f can be installed on any vintage 2450.
Critical Fixes
AR40324 Models affected:
PR51382
All 2450 models
Symptom:
The limit values in trigger.BLOCK_BRANCH_LIMIT_CONSTANT are saved incorrectly in the Create
Config operation.
Under certain conditions, limit values are saved as zero.
Resolution:
This issue has been corrected.
AR40457 Models affected:
PR51440
All 2450 models, SCPI2400 mode only
PR51987
Symptom:
Source Memory Sweep does not work properly when Source Auto Clear is enabled.
Resolution:
This issue has been corrected.
AR40488 Models affected:
AR40573
All 2450 models
AR40575
PR51449
Symptom:
Calibration date is set to 03/16/1996 after updating from v1.0.0i to v1.1.0s. This is due to the fact that
a new field was added between v1.0.0i and v1.1.0s and the new field was not initialized properly.
Resolution:
This issue has been corrected and Calibration Date will be set to the old Calibration Adjust Date if not
already initialized.
2450-850-FRP Rev. E / June 2015
13
Version v1.2.0f Release: Critical Fixes
Model 2450 Firmware Release Notes
AR40579 Models affected:
PR51546
All 2450 models
Symptom:
Black bars appear across the bottom of the screen capture image.
Resolution:
This issue has been corrected.
AR40591 Models affected:
PR51537
All 2450 models
Symptom:
When capturing multiple screen shots in succession, the following error would sometimes occur.
2350
Internal: SPLAT! drop packet to input queue
Resolution:
This issue has been corrected.
AR41514 Models affected:
PR52399
All 2450 models
Symptom:
VISA Device Clear over USB sometimes causes timeout and data loss.
Resolution:
This issue has been corrected.
AR41552 Models affected:
PR52941
All 2450 models
Symptom:
Under certain test setups, *RST (and front panel reset) will cause voltage spike at the output.
Resolution:
Voltage spikes after *RST (and front panel reset) have been greatly reduced.
AR41757 Models affected:
PR53544
All 2450 models
PR54481
Symptom:
14
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.2.0f Release
When sourcing current on the 100mA range or lower, and the instrument ranges up to the 1A range,
the source value may be incorrectly rounded.
Resolution:
This issue has been corrected.
AR42086 Models affected:
PR54659
All 2450 models
Symptom:
When source read-back is turned off, the programmed source values are returned. If the programmed
values are less than 1 volt, the returned values are incorrect due to rounding problems.
Resolution:
This issue has been corrected.
Enhancements
PR48621 Models affected:
All 2450 models
Enhancement:
Implement and document procedure for Clearing Memory and Data Sterilization for the Model 2450.
This document can be requested from the Keithley Instruments Quality team.
PR53367 Models affected:
All 2450 models
Enhancement:
Add SCPI equivalent for trigger.LOG_WARN_ABORT.
Overview
Version 1.2.0f is the third official firmware upgrade release for the Model 2450. Known Issues, Usage Notes, and
Upcoming Enhancements are listed below in this document.
added ABORt as the equivalent
trig:bloc:log:even 1, abort, "abort message"
trig:bloc:list?
1) LOG_EVENT EVENT: # 2733
2450-850-FRP Rev. E / June 2015
MESSAGE: "abort message"
15
Version v1.2.0f Release: Noncritical Fixes
Model 2450 Firmware Release Notes
Noncritical Fixes
PR50249 Models affected:
All 2450 models
Symptom:
GPIB: The SRQ annunciator does not get lit for GPIB, works ok for USB and VXI-11.
Resolution:
This issue has been corrected.
PR50426 Models affected:
All 2450 models
Symptom:
Clearing Limit 2 will clear the Limit 1 annunciator on the display instead of the Limit 2 annunciator.
Resolution:
This issue has been corrected.
PR51390 Models affected:
All 2450 models
Symptom:
The command
value = display.input.prompt(display.BUTTONS_YESNO, “Do you want to
continue?”)
will cause the variable “value” to return nil.
Resolution:
This issue has been corrected.
PR51807 Models affected:
All 2450 models
Symptom:
Some measure attributes are not saved in the Measure Configuration List.
smu.measure.configlist.recall() does not restore the following attributes:
- Display digits
- Limit auto clear
- Math percent
- User delay (1 through 5)
16
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.2.0f Release
If the filter is not enabled, the following attributes are not restored:
- Filter count
- Filter type
If relative offset is not enabled, the following attribute is not restored:
- Relative offset value
Resolution:
This issue has been corrected.
PR54651 Models affected:
All 2450 models
Symptom:
Changing the measure range low setting (used for auto-range) could result in incorrect operation if the
range is higher than the active measure range.
Resolution:
This issue has been corrected.
Known issues
N/A
2450-850-FRP Rev. E / June 2015
17
Version v1.1.0s Release: Overview
Model 2450 Firmware Release Notes
Version v1.1.0s Release
Overview
Version 1.1.0s is the second official firmware upgrade release for the Model 2450. Known Issues, Usage Notes,
and Upcoming Enhancements are listed below in this document.
Compatibility concerns
This version of firmware cannot be installed on newer 2450 systems. Also, once any system is
updated to firmware revision v1.2.0f or later, firmware version v1.0.0s can NEVER be installed again.
Critical Fixes
PR50333 Models affected:
AR39747
All 2450 models
Symptom:
2450 should not measure resistance with output off.
Because resistance measurements are dependent on the current or voltage source, resistance
measurements with the source off are meaningless and will be confusing to the user.
Resolution:
This issue has been corrected. Once the output has been turned on/off once, the 2450 will display
UNAVL (unavailable) in the upper right corner and the measurement fields will display dashes.
PR50703 Models affected:
AR39206
All 2450 models
Symptom:
The graph shows voltage drop as current instead of current when sourcing current and then selecting
source as the Y-axis.
Resolution:
This issue has been corrected.
PR50704 Models affected:
AR39257
All 2450 models
Symptom:
When certain sequences of SCPI commands using the :TRIG:LOAD:LOOP command were sent, the
2450 would throw a Fatal System Error requiring a 2450 power cycle to recover.
Resolution:
This issue has been corrected.
18
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.1.0s Release
PR50750 Models affected:
AR39364
All 2450 models
Symptom:
When setting up a source configuration list, in some cases the source configuration list screen on the
front panel GUI will show a source limit value of “None” if a config list point is selected.
Resolution:
This issue has been corrected.
PR50860 Models affected:
AR39658
All 2450 models
Symptom:
When zooming in on the graph, the magnitude of the data changes incorrectly. Sometimes the actual
graph area of interest will scroll out of sight.
Resolution:
This issue has been corrected. The overall graph zooming capability has been dramatically improved.
PR50998 Models affected:
AR39795
All 2450 models
Symptom:
In certain cases, when setting up a Dual Sweep, the last point of the Source Configuration List is
incorrect.
Resolution:
This issue has been corrected.
PR51005 Models affected:
AR39859
All 2450 models
Symptom:
There was an inconsistency in the *CLS command behavior with SCPI and 2400SCPI modes. In
SCPI and 2400SCPI modes, the Output Queue was not always cleared properly. In TSP mode, the
command sometimes returned Error Code -410 Query Interrupted or Error Code -420 Query
Unterminated.
Resolution:
This issue has been corrected.
2450-850-FRP Rev. E / June 2015
19
Version v1.1.0s Release: Critical Fixes
Model 2450 Firmware Release Notes
PR51046 Models affected:
AR39957
All 2450 models
Symptom:
When a Source Configuration List is generated in the Trigger Flow Model, everything works OK.
When the Source Configuration List is saved and then recalled, the 2450 sometimes returns the Error
Code -221 Conflict Error because the Currrent Range of all of the Source Points is always saved to
the 100uA range.
Resolution:
This issue has been corrected.
PR51263 Models affected:
AR40267
All 2450 models
Symptom:
Sometimes, the Abort on Source Limit setting does not work when the 2450 performs Voltage
Sweeping and reaches the Source Limit.
Resolution:
This issue has been corrected.
PR51051 Models affected:
AR40159
All 2450 models
Symptom:
Extra Current Steps occur between Current Source Range transitions when using the Source
Configuration List.
Resolution:
This issue has been corrected.
PR51186 Models affected:
AR39968
All 2450 models
Symptom:
2450 crashes after long period of time running through LabVIEWTM.
Resolution:
This issue has been corrected.
20
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.1.0s Release
Enhancements
PR50774 Models affected:
All 2450 models
Enhancement:
Implement new Virtual Front Panel capability.
To access the new Virtual Front Panel, access the 2450 through Ethernet using your favorite Internet
browser.
When asked for a Username and Password: enter the Username and Password for that particular
2450. The default Username is admin and the default Password is admin.
2450-850-FRP Rev. E / June 2015
21
Version v1.1.0s Release:
Model 2450 Firmware Release Notes
An example of the 2450 Virtual Front Panel is shown below. Users can use their mouse from a
standard PC to control the instrument. Users can also use touch screens from most touch screen
devices that can access the 2450 IP address.
22
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.1.0s Release
PR50906 Models affected:
All 2450 models
Enhancement:
2450 Quick Start Guide, User Manual, and Reference Manuals have all been updated.
The 2450 Release Notes for Firmware Revision v1.1.0s have also been updated and are available at
the Keithley Instruments, Inc. website.
Click Here  http://www.keithley.com/products/dcac/currentvoltage/2450smu/?path=2450/Documents
PR50231 Models affected:
All 2450 models
Enhancement:
Implement and document procedure for Customer onsite Calibration of Model 2450.
This capability is scheduled to be available late Q1’2014. Please check back at www.keithley.com for
updates in early April 2014.
PR48744 Models affected:
All 2450 models
Enhancement:
Provide capability for customers to save screen capture files from the front panel to the USB Flash
Drive.
This capability is documented in Rev-C of the 2450 Reference Manual in Section 2 Page 44 (2-44).
In short, with a valid USB Flash Drive inserted into the front USB port of the 2450, press the <HOME>
and <ENTER> keys simultaneously and the current screen image will be saved to the USB Flash
Drive.
PR50657 Models affected:
All 2450 models
Enhancement:
The maximum number of characters allowed for naming a Reading Buffer on the front panel GUI was
18 characters. The bus commands allow up to 32 characters. The GUI maximum number of
characters has been updated to 32 to match the bus command limit.
PR50662 Models affected:
All 2450 models
Enhancement:
2450-850-FRP Rev. E / June 2015
23
Version v1.1.0s Release:
Model 2450 Firmware Release Notes
Add a password verification method to the 2450 GUI.
When changing the 2450 system password, the user will be prompted to enter the password a second
time. The second entry will be used to verify that the first and second passwords match and that the
intended password has indeed been entered. If the two passwords do not match, an error dialog is
displayed and the users is instructed to try again.
PR50758 Models affected:
All 2450 models
Enhancement:
Scripts can be written in TSB and downloaded to the model 2450. However, scripts do not enable the
user to input values from the front panel. The 26xx family of SMUs allows users to input values into
their scripts real time.
Starting with firmware revision v1.1.0s, functionality has been added to the 2450 that allows users to
input values into the scripts real-time from the front panel.
The new commands are as follows:
display.input.number()
display.input.option()
display.input.prompt()
display.input.string()
These commands are documented in Rev-C of the 2450 Reference Manual in Section 8 Page 51 (851).
PR50866 Models affected:
All 2450 models
Enhancement:
The 2450 System Information window has been updated to show calibration adjustments vs.
calibration without adjustment dates. The System Information window now presents these dates as
follows.
Adjust Date
Adjust Count
Calibration Date
11/19/2013
1
4/17/2014
PR50876 Models affected:
All 2450 models
Enhancement:
The behavior of the *LANG? command on the 2450 has been changed as follows.
Sending the query *LANG? over a non-controlling interface will no longer change the interface control
of the unit. For example, if the unit is under local control, then sending the *LANG? over Telnet, USB,
or GPIB will leave the unit under local control. This was done in order for KickStart (or any other
remote control software) to query connected/accessible instruments without resetting them or
changing or disturbing the current trigger model.
24
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.1.0s Release
PR51248 Models affected:
All 2450 models
Enhancement:
The 2450 built-in webpage has been enhanced to show a historical list of commands recently sent to
the instrument. This new COMMAND OUTPUT window has been added to the Send Commands
section of the webpage.
PR51249 Models affected:
All 2450 models
Enhancement:
The 2450 built-in webpage has been enhanced. A new button “Return Error” has been added to allow
users to easily query the last unread error number and error message. This new functionality works in
both TSP and SCPI modes.
2450-850-FRP Rev. E / June 2015
25
Version v1.1.0s Release: Noncritical Fixes
Model 2450 Firmware Release Notes
Noncritical Fixes
PR50285 Models affected:
All 2450 models
Symptom:
On the Manage Scripts window, the Left Arrow and Delete buttons remain enabled and active even
after a USB Flash Drive has been removed from the instrument.
Resolution:
This issue has been corrected.
PR50404 Models affected:
All 2450 models
Symptom:
TSP-Link reset or initialization may consistently fail on some 2450 units. The unit being reset may
ignore the reset, stop responding to bus commands, and/or display “Slave” in the Communication
Status Indicator.
Resolution:
This issue has been corrected.
PR50670 Models affected:
All 2450 models
Symptom:
The LAN Reset button on the back of the 2450 failed to reset the system password.
Resolution:
This issue has been corrected and the system password is reset to the default, admin.
PR50772 Models affected:
All 2450 models
Symptom:
Offset Compensation for SVMI (ohms) and Offset Compensation for SIVM (ohms) did not perform the
offset measurement correctly.
Resolution:
This issue has been corrected.
26
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.1.0s Release
PR50785 Models affected:
All 2450 models
Symptom:
On the Trigger Flow Screen, the default Bit Pattern and Bit Mask show 255. Since there are only 6
trigger lines on the 2450, the maximum Bit Pattern should be no more than 63.
Resolution:
This issue has been corrected. The maximum value for Bit Pattern is now 63. The maximum value for
Bit Mask remains 255.
PR50786 Models affected:
All 2450 models
Symptom:
Digital I/O Trigger blocks behavior functionality was not correct.
Resolution:
For Digital I/O Trigger blocks, as the mask setting changes, any bits that are set to 1 will have the
corresponding Digital I/O line set to Digital I/O Output Mode. For bits set to 0, those corresponding
Digital I/O line modes remain unchanged.
PR50899 Models affected:
All 2450 models
Symptom:
The default value for Source Current Range displayed on the front panel does not match the actual
Source Current Range value.
Resolution:
The default Current Source Range is now 10nA in (2450) SCPI mode.
PR50903 Models affected:
All 2450 models
Symptom:
Source Current and Source Voltage Levels have incorrect Min and Max Values.
:SOURce[1]:CURRent[:LEVel][:IMMediate][:AMPLitude]reports that the minimum
acceptable value is -1.00 and maximum is 1.00 when they should be -1.05 and 1.05, respectively.
Resolution:
This issue has been corrected.
2450-850-FRP Rev. E / June 2015
27
Version v1.1.0s Release: Noncritical Fixes
Model 2450 Firmware Release Notes
PR50979 Models affected:
All 2450 models
Symptom:
If a Sweep Function encounters a Source Limit Value Event, the Source will not turn off.
Resolution:
This issue has been corrected. The 2450 will now automatically turn off the Source Output if a Source
Limit Event occurs.
PR51033 Models affected:
All 2450 models
Symptom:
Sending *IDN? over USB TMC causes the unit to switch into USBTMC control instead of staying
with the current active interface. It also puts the trigger model back into IDLE mode.
Resolution:
This issue has been corrected.
PR51205 Models affected:
All 2450 models
Symptom:
ICL command “display.changescreen()” can lock up after the command “reset()” is called over and
over again.
Resolution:
This issue has been corrected.
28
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.1.0s Release
Known issues
PR48636 Model 2450 does not respect a USB Flash drive file that is read only.
Models affected:
2450
Symptom:
The 2450 will write over read-only files on flash drives. For example, if the 2450 attempts to write to file
aaa.txt and aaa.txt is marked read-only, the 2450 will rewrite file aaa.txt without warning. This problem
does NOT suggest the 2450 randomly overwrites arbitrary files on a flash drive.
Workaround:
There is no known workaround for this issue at this time.
PR49308 trigger.BLOCK_BRANCH_COUNTER loop without a measure or delay block appears to hang.
SCPI: :TRIGger:BLOCk:BRANch:COUNter
TSP: trigger.model.setblock() with trigger.BLOCK_BRANCH_COUNTER
Models affected:
2450
Symptom:
When running a tight trigger loop without a measurement or delay in the sequence, the 2450 will be
unresponsive until the loop ends.
Workaround:
Add any measurement or short delay in the trigger loop and the 2450 will perform normally. A future
firmware release will work around this problem automatically.
2450-850-FRP Rev. E / June 2015
29
Version v1.0.0i Release: Overview
Model 2450 Firmware Release Notes
Version v1.0.0i Release
Overview
Version 1.0.0i is the initial firmware release for the Model 2450. No fixes are listed since this is the very first
firmware release. Known Issues, Usage Notes, and Upcoming Enhancements are listed below in this document.
Compatibility concerns
This version of firmware cannot be installed on newer 2450 systems. Also, once any system is
updated to firmware revision v1.2.0f or later, firmware version v1.0.0i can NEVER be installed again.
Critical fixes
N/A
Enhancements
N/A
Noncritical fixes
N/A
Known issues
PR48636 Model 2450 does not respect a USB Flash drive that is read only.
Models affected:
2450
Symptom:
The 2450 will write over read-only files on flash drives. Specifically, if the 2450 attempts to write to file
aaa.txt and aaa.txt is marked read-only, the 2450 will rewrite file aaa.txt without warning. This problem
does NOT suggest the 2450 randomly overwrites arbitrary files on a flash drive.
Workaround:
There is no known workaround for this issue at this time.
PR49308 Trigger.BLOCK_BRANCH_COUNTER loop without a measure or delay block causes hang.
SCPI: :TRIGger:BLOCk:BRANch:COUNter
TSP: trigger.model.setblock() with trigger.BLOCK_BRANCH_COUNTER
Models affected:
2450
Symptom:
When running a tight trigger loop without a measurement or delay in the sequence, the 2450 will be
unresponsive until the loop ends.
Workaround:
30
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.0.0i Release
Simply add any measurement or short delay in the trigger loop and the 2450 will perform normally. A
future firmware release will work around this problem automatically.
PR49812 MANUAL: Better explanation of sweep delay needed.
Models affected:
All 2450
Symptom:
Recent changes to the sweep commands did not get added to the 2450 Reference Manual in time for
first release.
Workaround:
The sweep commands accept a delay setting of 0 for no delay, -1 for auto delay (excluding the list
command), or constant value between 50 us and 10000 s.
The TSP sweep commands are:
smu.source.sweeplinear()
smu.source.sweeplinearstep()
smu.source.sweeplist()
smu.source.sweeplog().
The SCPI sweep commands are :
:SOURce[1]:SWEep:<function>:LINear
:SOURce[1]:SWEep:<function>:LINear:STEP
:SOURce[1]:SWEep:<function>:LIST
:SOURce[1]:SWEep:<function>:LOG
For smu.source.sweeplist() and :SOURce[1]:SWEep:<function>:LIST, the delay setting
configures a constant delay trigger block in the trigger model.
A delay of zero omits the trigger block.
The configuration list delay settings act independently of the delay specified in the command.
Therefore, a double delay may result by utilizing both.
The next version of the 2450 Reference Manual will be updated.
PR49835 Recalling measure configuration list causes error 823.
Models affected:
All 2450
Symptom:
When recalling the measure configuration list before the source configuration list, the error code 823
may be displayed.
Workaround:
When recalling both source and measure configuration lists, always recall the source configuration list
before the measure. This order ensures that dependencies between source and measure settings will
be properly handled.
2450-850-FRP Rev. E / June 2015
31
Version v1.0.0i Release: Known issues
Model 2450 Firmware Release Notes
PR49885 MANUAL: Source delay is incorrect for default settings and resistance measure function.
SCPI: :SOURce[1]:<function>:DELay
TSP: smu.source.delay
Models affected:
All 2450
Symptom:
In the 2450 Reference Manual, the documentation for the command smu.source.delay claims the
default setting is .001. This is NOT TRUE. There is no default value for the command
smu.source.delay and if queried without being set, will return the last auto delay setting.
The manual also states “If you turn auto delay back on, the programmed source delay value is added
to the auto delay time.” This is also incorrect.
Workaround:
Make sure to set an initial value for smu.source.delay.
The next version of the 2450 Reference Manual will be corrected.
PR49892 Changes to the Reference Manual.
Models affected:
All 2450
Symptom:
A number of miscellaneous late changes were not added in time to Rev-A revision of the 2450
Reference Manual. Some of the key issues have been documented here.
A) The following commands have been removed from the product:
SCPI: SYSTem:BEEPer:STATe
TSP: beeper.enable
These commands have been used in various places in the manual and in documented examples.
These references will be removed in the next revision of the manual. No substitute commands
have been provided.
B) Digital I/O behavior:
a. For digital I/O lines, changing the line mode to input will set the line state high.
b. For digital I/O lines, changing the line mode to output will set the line state low.
c.
32
When configuring digital I/O, the output side of the line should be configured before the
input side to avoid a false input trigger detection
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.0.0i Release
C) Using the reset() command:
a. On page 3-125 in the Reference Manual, the following NOTE is INCORRECT. The
command tsplink.initialize() DOES change the states of the individual nodes in
the system.
D) Resistance Mode Changes: Auto Ohms vs. Manual Ohms:
a. Significant changes were made to the way resistance mode was documented in Revision
A of the 2450 Reference Manual. Below is a summary of differences in the Reference
Manual vs. the actual implementation. The Reference Manual will be updated to reflect
these changes in Revision B of the 2450 Reference Manual.
Sections affected are 2-91, 6-46, 8-116, and 9-14.
b. The term “Auto Ohms” has been removed from the user interface. The user interface now
presents “Ohmmeter” as a One-Touch Quick Setup (see diagram below).
c.
The term “Manual Ohms” has been removed from the user interface. The user interface
now presents “Resistance” as a Measure function vs. Voltage or Current Source (see
diagram below).
d. The following commands have been eliminated
i. [SENSe[1]]:RESistance:MODe AUTO | MANual (SCPI, section 6-46)
ii. smu.measure.resistancemode = smu.RESISTANCE_AUTO or
smu.RESISTANCE_MANUAL (TSP, section 8-116)
e. The following existing commands have a new argument as follows
i. [SENSe[1]]:<function>:UNIT
(section 6)
ii. smu.measure.unit = <WATT>
f.
WATT | OHM | VOLT | AMP
<OHM>
<VOLT>
<AMP>
New TSP Command Usage:
i. “Manual Ohms”  Measures resistance by sourcing voltage, measuring current,
and calculating the resistance reading.
 smu.source.func = smu.FUNC_DC_VOLTAGE
 smu.measure.func = smu.FUNC_DC_CURRENT
 smu.measure.unit = smu.UNIT_OHM



OR
smu.source.func = smu.FUNC_DC_CURRENT
smu.voltage.func = smu.FUNC_DC_VOLTAGE
smu.measure.unit = smu.UNIT_OHM
ii. “Auto Ohms”  Measures resistance by sourcing current, measuring voltage, and
calculating the resistance reading. In this case, the source current and source
limit are automatically calculated and set.
2450-850-FRP Rev. E / June 2015
33
Version v1.0.0i Release: Known issues
Model 2450 Firmware Release Notes

smu.measure.func = smu.FUNC_RESISTANCE
g. New SCPI Command Usage:
i. “Manual Ohms” (see definition above)
 SOURce:FUNC VOLTage
 [SENSe[1]]:FUNC “CURRent”
 [SENSe[1]]:CURRent:UNIT OHM



OR
SOURce:FUNC CURRent
[SENSe[1]]:FUNC “VOLTage”
[SENSe[1]]:VOLTage:UNIT OHM
ii. “Auto Ohms” (see definition above)

[SENSe[1]]:FUNC “RESistance”
h. Front panel user interface setting of Manual vs. Auto Ohms measurements
<see the following figure for details>
34
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.0.0i Release
PR49955 Cannot repeatedly reconnect with LAN triggers.
Models affected:
All 2450
Symptom:
Certain scripts (where LAN connections are quickly and repeatedly disconnected and reconnected in
rapid succession) may cause a failed connection.
Workaround:
Due to limited socket resources, the safest rate of making LAN connections is 1 connection per
second. If there is need for more than one LAN connection per second, the total number of socket
resources available is approximately 180, and after a socket is closed, it will take 2 minutes to become
available again.
PR50042 MANUAL: TSP-Link mode command only supports open drain.
Models affected:
All 2450
Symptom:
In the 2450 Reference Manual, the documentation erroneously states that the TSP command
tsplink.line[N].mode accepts the following parameters:
tsplink.MODE_DIGITAL_IN
tsplink.MODE_DIGITAL_OUT
tsplink.MODE_TRIGGER_IN
tsplink.MODE_TRIGGER_OUT
Workaround:
Do not use the parameters listed above in the command tsplink.line[N].
The next version of the 2450 Reference Manual will be corrected.
PR50188 MANUAL: The source sweep list function does not support smu.DELAY_AUTO.
Models affected:
All 2450
Symptom:
In the 2450 Reference Manual, the documentation incorrectly states that the source sweep list function
supports the setting smu.DELAY_AUTO.
Workaround:
Do not use the setting -1 for delay in the following command:
2450-850-FRP Rev. E / June 2015
35
Version v1.0.0i Release: Known issues
Model 2450 Firmware Release Notes
:SOURce[1]:SWEep:<function>:LIST
Do not use the setting smu.DELAY_AUTO in the following command:
smu.source.sweeplist()
The next version of the 2450 Reference Manual will be corrected.
PR50228 The display.screen command has been changed.
Models affected:
All 2450
Symptom:
The TSP attribute command, display.screen, has been replaced with a TSP function,
display.changescreen(). The parameters to the new function are the same that
display.screen previously took as a set attribute.
The SCPI query command DISPlay:SCReen? does not exist.
The DISPlay:SCReen command is only intended to change the screen view NOT to query which
view is active
Workaround:
N/A
PR50231 Need to Add Customer Calibration.
Models affected:
All 2450
Symptom:
Because the 2450 added two lower current ranges and one lower voltage range, existing 2400
customer calibration hardware will not work on the 2450. Keithley is working on a recommended
customer calibration equipment list, but for now, customer calibration of the 2450 is not supported.
Workaround:
Keithley plans to support customer calibration within six months after shipping the initial Model 2450.
Please see www.keithley.com for updates.
PR50350 Trying to print beyond buffer dimensions causes timeout for new buffer.
Models affected:
All 2450
Symptom:
Attempting to print buffer elements that are outside the range of [1, bufferVar.n] may cause a
script to hang or a bus command to timeout.
36
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
Version v1.0.0i Release
Workaround:
Prior to using print() command with a buffer or printbuffer(), the elements or bounds provided
should be checked to ensure that they are between 1 and bufferVar.n, inclusively.
PR50378 Config lists generated by the sweep API don’t get saved to the config script.
Models affected:
All 2450
Symptom:
Changes made to source config lists generated using the sweep API are not retained when saving the
configuration.
Workaround:
Move all points in the config list generated using the sweep API to a new config list. This can be
accomplished by first, creating a new config list. Next, iteratively recall each point from the sweep
config list and store it to the new config list. Then delete the config list generated by the sweep API.
Finally, build a custom trigger model that uses the new config list.
PR50379 Customer trigger model is overwritten when restoring pre-boxed sweep.
Models affected:
All 2450
Symptom:
Changes made to trigger models generated using the sweep API are not retained when saving the
configuration.
Workaround:
Move all points in the config list generated using the sweep API to a new config list. This can be
accomplished by first, creating a new config list. Next, iteratively recall each point from the sweep
config list and store it to the new config list. Then delete the config list generated by the sweep API.
Finally, build a custom trigger model that uses the new config list.
PR50404 TSP-Link does not reset properly on some units.
Models affected:
All 2450
Symptom:
TSP-Link reset or initialization may consistently fail on certain units. The unit being reset or initialized
may ignore the reset or initialization command, stop responding to bus commands, and/or display
"Slave" in the communications status indicator.
Workaround:
If the reset or initialization command is ignored, try calling it again. It may necessary to repeat this
action up to ten times. If the command causes a time-out for bus communications and/or "Slave" is
2450-850-FRP Rev. E / June 2015
37
Version v1.0.0i Release: Known issues
Model 2450 Firmware Release Notes
displayed in the communications status indicator for the unit being reset or initialized, then it is
necessary to choose a different unit to be the TSP-Link master.
PR50497 SCPI command syntax checking: Error is not generated if parameter is not valid long or short form of
the specified command.
Models affected:
All 2450
Symptom:
The 2450 fails to generate an error when the parameter to a SCPI command does not match either the
short or long form of the parameter being specified. Instead, the unit will accept any number of
characters between the short and long form as being valid. For example, in the following list, only the
first two examples should be allowed, however, the additional four examples are being accepted as
valid. In a future firmware release, the additional four examples will generate an error message.
COMMAND
v1.0.0 Firmware
Future Firmware
:SYSTem:EVENtlog:COUNt? INF
OK
OK
:SYSTem:EVENtlog:COUNt? INFORMATIONAL
OK
OK
:SYSTem:EVENtlog:COUNt? INFO
OK
SYNTAX ERROR
:SYSTem:EVENtlog:COUNt? INFORM
OK
SYNTAX ERROR
:SYSTem:EVENtlog:COUNt? INFORMAT
OK
SYNTAX ERROR
:SYSTem:EVENtlog:COUNt? INFORMATION
OK
SYNTAX ERROR
Workaround:
Only send a valid short or long form of the SCPI command parameter. Based on the example listed,
send either INF or INFORMATIONAL for the related command. This will avoid new syntax errors when
upgrading to new 2450 firmware in the future.
PR51449 Calibration Date is set to 03/16/1996 after updating 1.0.0i to 1.1.0s.
Models affected:
All 2450
Symptom:
After upgrading the 2450 firmware from version v1.0.0i to v1.1.0s, the Calibration Date is 03/16/1996.
Do NOT be alarmed. This issue has NO IMPACT on calibration and calibration values. The issue is
that from v1.0.0i to v1.1.0s, a new date field was added and it has not been initialized properly. Also,
the date headings have also changed to differentiate between Adjust Date and Calibration Date (e.g.
Verification Date). See the diagrams below.
38
2450-850-FRP Rev. E / June 2015
Model 2450 Firmware Release Notes
v1.0.0i firmware
Version v1.0.0i Release
v1.1.0s firmware
Before, there was only one date field named “Calibration Adjust Date.” This was the date that the
2450 was last calibrated WITH adjustment. Starting with the v1.1.0s firmware, a new date named
“Calibration Date” was added to display and differentiate between the Adjust Date and Calibration
(without adjust) Date. The new “Adjust Date” is the same field as the old “Calibration Adjust Date.”
The new “Calibration Date” is brand new field and this will be the date the 2450 was last calibrated
WITHOUT adjustment. Since the new “Calibration Date” field did not exist with v1.0.0i firmware, this
new date is un-initialized and has defaulted to 03/16/1996. Again, this has zero impact on the original
factory calibration and does not impact the factory stored calibration constants in any way.
Workaround:
This date will be properly set the next time the 2450 is returned to Keithley or a designated field
service office for recalibration. If you insist on updating the “Calibration Date” to equal the “Adjust
Date”, please refer to the “Model 2450 Interactive SourceMeter Calibration Manual.” This manual can
be found at www.keithley.com. The document is 2450-905-01.
2450-850-FRP Rev. E / June 2015
39
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