KEITHLEY 2401 Source Meter
Specifications
- Model: 2401
- Firmware Release: B04
- Release Date: June 2025
Product Usage Instructions
Installation Instructions:
Perform the following steps to install the firmware revision onto the Model 2401 instrument:
- Run the Flash Wizard program.
- Select the appropriate interface at the Communications Select screen and follow any subsequent instructions.
- Ultimately, the program should auto-detect the 2401.
- You will then be asked to specify the firmware file.
- The upgrade proceeds from there. It typically only takes a few minutes.
Contact Keithley if you encounter any problems during the upgrade process.
Upgrade Considerations:
Consider the following table when deciding to upgrade to version B04:
| Consideration | Recalibration Required | Re-qualification Suggested | Should you upgrade? |
|---|---|---|---|
| From A01 | No | N/A | No |
| From B01 | No | No | Review |
| From B02 | No | No | Review |
Keithley Instruments 28775 Aurora Road Cleveland, Ohio 44139 1-800-833-9200 tek.com/keithley
General Information
Supported Models
This firmware is used on the following Keithley Instruments product model:
- Model 2401 SourceMeter®
Installation Instructions
Download the following from the Keithley Support Website
- The Keithley Flash Wizard32, version C12 or higher (if you do not already have this)
- Unzip the files in a folder of your choice and then run the “setup.exe” program.
- Follow the instructions to install the program.
- The firmware revision image file you want to install on your Model 2401 instrument.
Perform the following steps to install the firmware revision onto the Model 2401 instrument:
- Run the Flash Wizard program.
- Select the appropriate interface at the Communications Select screen and follow any subsequent instructions.
- Ultimately the program should auto-detect the 2401.
- You will then be asked to specify the firmware file.
- The upgrade proceeds from there.
It typically only takes a few minutes. Contact Keithley if you have any problems
Upgrade Considerations for 2401
The following table outlines the considerations that should be made when deciding to upgrade to this version or not from any previous version.
| Consideration | From A01 | From B01 | From B02 |
| Recalibration Required | — | No | No |
| Re-qualification Suggested | — | No | No |
| Should you upgrade? | No | Review | Review |
A Model 2401 instrument with Version A01 firmware is incompatible with Version ‘B’ firmware, such as B03. You should not upgrade A01 to any ‘B’ versions. Contact Keithley Instruments if you require upgrades.
Version B04 Release
Overview
Version D04 is a maintenance-only release to support the new 10-digit serial number format.
Critical fixes
- There are no critical fixes included in this release.
Enhancements
- There are no enhancements included in this release.
Version B03 Release
Overview
Version B03 release fixes issues with RS-232 flash upgrades, RS-232 break-byte functionality, and range change problems.
Critical fixes
AR 66391
Models affected: 2401
Symptom:
Flash upgrades utilizing RS-232 would fail at all baud rates.
Resolution:
The issue has been corrected.
Non-critical fixes
AR 67009
Models affected: 2401
Symptom:
When sourcing 100 mA at 2 V compliance and measuring voltage, switching the source range to the 1 A range would cause a problem that would cause the measured value to be incorrect.
Resolution:
The issue has been corrected.
AR 66390
Models affected: 2401
Symptom:
When attempting to send a break-byte character to the unit, the pending operation would not be stopped.
Resolution:
The issue has been corrected.
Version B02 Release
Overview
Version B02 release is to address issues with RS-232 on the new hardware in the Model 2401 SourceMeter®.
Critical fixes
PR 61943
Models affected: 2401
Symptom:
RS-232 serial communication experiences issues when the baud rate is greater than 9600. Additionally, a baud rate of 300 is not supported on new hardware.
Resolution:
The communication issues when the baud rate is greater than 9600 have been corrected. Removed option of 300 baud rate from unit.
Enhancements
- There are no enhancements included in this release.
Version B01 Release
Overview
The Version B01 release supports new hardware in the Model 2401 SourceMeter®.
Critical Fixes
No fixes are included.
Enhancements
- No Enhancements are included.
Version A01 Release
Overview
- The Version A01 release is the initial release of the Model 2401 SourceMeter®.
Known Issues
- There are no known issues with version A01.
FAQs
Q: Can I upgrade from Version A01 to Version B03?
A: No, a Model 2401 instrument with Version A01 firmware is incompatible with Version 'B' firmware. Contact Keithley Instruments for further assistance.
Documents / Resources
 | KEITHLEY 2401 Source Meter [pdf] User Guide 2401 Source Meter, 2401, Source Meter, Meter |