Keithley Instruments
28775 Aurora Road
Cleveland, Ohio 44139
1-800-833-9200
tek.com/keithley
Model 2601B-PULSE
077168000 May 2020
*P077168000*
1
Declassification and Security Instructions
Introduction
If you have data security concerns, this document tells you how to clear or sanitize instrument memory devices
in the Model 2601B-PULSE System SourceMeter® Instrument. It also explains how to declassify an instrument
that is not functioning.
The procedures in this document are written to meet the requirements specified in:
▪ NISPOM, DoD 5220.22-M, chapter 8
▪ ISFO Process Manual for Certification and Accreditation of Classified Systems under NISPOM
Contact information
If you have any questions after you review the information in this documentation, please contact your local
Keithley Instruments office, sales partner, or distributor. You can also call the Tektronix corporate headquarters
(toll-free inside the U.S. and Canada only) at 1-800-833-9200. For worldwide contact numbers, visit
tek.com/contact-us.
Terminology
The following terms may be used in this document:
▪ Clear: Removes data on media or in memory before reusing it in a secured area. Clears all reusable
memory to deny access to previously unsecured information.
▪ Demo setups: Demonstration applications that come loaded on the instrument; you cannot modify them.
▪ Direct method of modification: You can modify data directly.
▪ Erase: Equivalent to clear (see above).
▪ Indirect method of modification: The instrument system resources modify the data; you cannot
modify it.
▪ Instrument declassification: Procedures that must be completed before an instrument can be removed
from a secure environment. Declassification procedures include memory sanitization and
memory removal.
▪ Media storage and data export device: Devices that can be used to store or export data from the
instrument, such as a USB port.
▪ Nonvolatile memory: Data is retained when the instrument power is turned off.
▪ Protected user data area: Contains data that is protected by a password.
▪ Remove: Clears instrument data by physically removing the memory device from the instrument.
Model 2601B-PULSE Declassification and Security Instructions
2 077168000 May 2020
▪ Sanitize: Eradicates instrument data from media and memory so it cannot be recovered by other means
or technology. This is typically used when the device will be moved (temporarily or permanently) from a
secured area to a nonsecured area.
▪ Scrub: Directly retrieve and clear the contents of the memory device.
▪ User accessible: You can directly retrieve the contents of the memory device.
▪ User data: Measurement data that represents signals that you connect to the instrument.
▪ User modifiable: You can write to the memory device during normal instrument operation using the
front-panel interface or remote control.
▪ User settings: Instrument settings that you can change.
▪ Volatile memory: Temporary memory; data is lost when the instrument is turned off.
Description of memory
The 2601B-PULSE contains memory devices to hold firmware code that is executed by internal
microprocessors to operate the product and memory to save setup information and data. The 2601B-PULSE
stores data in volatile and nonvolatile memory in the following devices:
▪ Microprocessors: Contain some RAM for internal use. All information is lost when the instrument is
powered down.
▪ Flash: A 32-megabyte flash device responsible for storing critical nonvolatile information, including:
▪ The firmware image
▪ The digital-side and analog-side FPGA images
▪ Factory scripts
▪ Dedicated reading buffers
▪ An internal file system, which stores system settings, user setups, user strings, and user scripts
SDRAM: A total of 64 megabytes that holds data and instructions for firmware execution.
EEPROM: Two 128-kilobit devices that store calibration constants for the SMU and pulser and manufacturing
strings (for example, the analog board serial number).
Memory devices
The following tables list the volatile and nonvolatile memory devices in the standard instrument and
listed options.
Model 2601B-PULSE Declassification and Security Instructions
077168000 May 2020 3
Type and
minimum size
Function
User
modifiable
Data input
method
Location
To clear
To sanitize
SRAM 32 kB
Temporary memory
used by the
microprocessor
controller for internal
processor
operations
Yes
Indirect
U1 on the
2636-142
digital board
Turn
instrument
power off
Turn
instrument
power off
SRAM 32 kB
Instruction cache for
the microprocessor
controller
No
None
U1 on the
2636-142
digital board
Turn
instrument
power off
Turn
instrument
power off
SRAM 32 kB
Data cache for the
microprocessor
controller
Yes
Indirect
U1 on the
2636-142
digital board
Turn
instrument
power off
Turn
instrument
power off
DDR SDRAM
32 MB
Temporary memory
used by the
microprocessor
controller for internal
processor
operations
Yes
Indirect
U6 on the
2636-142
digital board
Turn
instrument
power off
Turn
instrument
power off
DDR SDRAM
32 MB
Temporary memory
used by the
microprocessor
controller for internal
processor
operations
Yes
Indirect
U7 on the
2636-142
digital board
Turn
instrument
power off
Turn
instrument
power off
SRAM
4 kB
Temporary memory
used by the display
controller for internal
processor
operations
Yes
Indirect
U2 on the
2602-112
display board
Turn
instrument
power off
Turn
instrument
power off
FPGA
SRAM 432 kB
CLB 1920
(120 kB)
Digital control and
communication with
other TSP-Link
enabled instruments
Yes
Indirect
U29 on the
2636-142
digital board
Turn
instrument
power off
Turn
instrument
power off
FPGA
SRAM 288 kB
CLB 896
(56 kB)
Digital control
No
None
U9 on the
2602a-102
analog board
Turn
instrument
power off
Turn
instrument
power off
FPGA
SRAM 288 kB
CLB 896
(56 kB)
Digital control
No
None
U9 on the
389552700
analog board
Turn
instrument
power off
Turn
instrument
power off
SRAM 32 B
Temporary memory
used to transfer data
over the GPIB
interface
Yes
Indirect
U35 on the
2636-142
digital board
Turn
instrument
power off
Turn
instrument
power off
Volatile memory devices
The following table lists the volatile memory devices in the 2601B-PULSE instrument and relevant
memory-related information.
Model 2601B-PULSE Declassification and Security Instructions
4 077168000 May 2020
Type and
minimum size
Function
User
modifiable
Data input
method
Location
To clear
To sanitize
FLASH
32 MB
Instrument firmware,
user script storage,
user string storage,
user settings
storage, reading
buffer storage
Yes
Direct and
indirect
U14 on the
2636-142
digital board
Follow the
Clearing
Data
procedures
Remove
chip
FLASH
64 kB
Display control
firmware
No
None
U2 on the
2602-112
display board
N/A
N/A
EEPROM
1 kB
Not used
No
None
U2 on the
2602-112
display board
N/A
N/A
EEPROM
16 kB
Calibration
constants and
manufacturing
information
Yes
Indirect
U12 on the
2602a-102
analog board
N/A
Remove
chip
EEPROM
16 kB
Calibration
constants and
manufacturing
information
Yes
Indirect
U12 on the
389552700
analog board
N/A
Remove
chip
Type and
minimum size
Function
Method of
modification
Data input
method
Location
To disable
USB host port
User storage of
results and
instrument setup
Direct
User writeable
USB host port
on the front of
the instrument
The USB host
port cannot be
disabled
USB device port
Supports remote
control and data
transfer to a
computer
Direct
Remote control
via USBTMC
Rear panel of
the instrument
The USB device
port cannot be
disabled
LAN ethernet
port
Supports remote
control and data
transfer to a
computer
Direct
Remote control
Rear panel of
the instrument
The LAN
ethernet
controller
cannot be
disabled
GPIB port
Supports remote
control and data
transfer to a
computer
Direct
Remote control
Rear panel of
the instrument
The GPIB port
cannot be
disabled
Nonvolatile memory devices
The following table lists nonvolatile memory devices and relevant memory-related information. If the table
indicates that a device can be cleared by the user, see the detailed instructions in Clearing data (on page 5).
Data export devices
The following table lists 2601B-PULSE data export devices. Procedures to disable these devices, if any,
are included.
Model 2601B-PULSE Declassification and Security Instructions
077168000 May 2020 5
Clearing data
The clearing procedures do not remove all traces of data from the instrument. The clearing procedures do
make it impossible to retrieve the information using published commands. However, a person with intimate
knowledge of the internal operation of the 2601B-PULSE and knowledge of unpublished commands could
retrieve fragments of previously stored information using the standard command interface.
All volatile memories
After clearing nonvolatile memories, power down the instrument for ten minutes.
Flash memory
To clear USER setups from the instrument using the virtual front panel:
1. Press MENU.
2. Select SAVE-SETUP. Press ENTER.
3. Select RECALL, press ENTER.
4. Select FACTORY, press ENTER.
5. Press EXIT.
6. Press MENU.
7. Select SAVE-SETUP. Press ENTER.
8. Select SAVE. Press ENTER.
9. Select USER-1. Press ENTER.
Repeat steps 6 to 9 for the each of the five USER setups.
To clear USER setups using a remote interface, send the following command:
script.delete("scriptName")
Where scriptName is the name of the script to be deleted. You need to do this for each saved setup.
To clear the buffers:
1. Make sure all inputs are open.
2. On the front panel, select CONFIG, then STORE.
3. Select CHANA-BUFF.
4. Select BUFFER1.
5. Select CLEAR.
6. Select YES.
7. Select BUFFER2.
8. Select CLEAR.
9. Select YES.
Model 2601B-PULSE Declassification and Security Instructions
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To clear buffers using a remote interface:
smua.nvbuffer1.clear()
smua.nvbuffer2.clear()
To clear userstrings:
1. Remove userstrings by sending:
for name in userstring.catalog() do userstring.delete(name) end
2. Delete each userstring by sending userstring.delete(name).
EEPROM
Two EEPROMs store calibration and manufacturing data. This data is only indirectly changed by calibrating the
instrument. The EEPROMs do not need to be cleared unless the instrument was calibrated in an unusual way.
To delete all calibration constants:
1. Send the following commands:
smua.cal.unlock("KI0026XX")
smua.cal.nominals()
smua.cal.save(0)
smua.cal.save(1)
smua.cal.save(2)
smua.cal.save(3)
smua.cal.lock()
2. Recalibrate the instrument.
Reset the LAN
Resetting the local area network (LAN) resets th e LAN settings and the instrument password to the system
default values.
To reset the LAN, send the command:
lan.reset()
Sanitize instrument data
The only way to sanitize data from an instrument is to physically remove the nonvolatile memory devices listed
in the tables above.
Sanitize a nonfunctional instrument
To sanitize a nonfunctional instrument, remove the digital boards and return the instrument to Keithley
Instruments for installation of replacement boards.
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