From The Front Panel - Tektronix Keithley 2281 Series Reference Manual

Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
To locate the upgrade files:
1. Go to the
2. Next to Enter model, type 2281S, and select GO.
3. Select the Software tab.
4. Select the firmware link that you want to download (note that you will need to log in or register to
continue).
5. Once you are logged in, select the Download File button and choose where to download your file.
You can rename the file if you want.
6. Unzip the download file.
Disconnect the input and output terminals before you upgrade or downgrade.
Do not remove power from the Model 2281S-20-6 or remove the USB flash drive while an
upgrade or downgrade is in progress. Wait until the instrument completes the procedure and
shows the opening display.

From the front panel

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 flash drive must be less than or equal to
2 GB and formatted in the FAT file format).
2. Verify that the upgrade file is in the root subdirectory of the flash drive and that it is the only
firmware file in that location.
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 Enter.
7. Press the MENU key.
8. Under System, select Information.
9. Select Upgrade, and press the ENTER key.
077114601 / March 2019
Product Support web page (tek.com/product-support).
Appendix A: Maintenance
A-3