These are the installation instructions for replacing the firmware
in a 3 Series oscilloscope with the firmware in the zip file.

Contents of this zip package:

    install.txt            - this text file
    releaseNotes.txt       - describes differences between firmware versions
    3SeriesMDO_Vx_x_xx.img - firmware file readable by 3 Series oscilloscopes where x_x_xx is the firmware version, e.g., 1.4.26
    Applicable open source licensing references.

Caution:

    Loading new firmware will cause all previously saved reference
    waveforms to be deleted. You may wish to save the internal reference
    waveforms to external .isf files, before loading the new firmware.

    To save an internal reference (Ref) waveform to a .isf file, follow
    these steps:
	1. Insert a flash drive into one of the USB slots
	2. Tap the 'Math/Ref/Bus' button
	3. Tap the relevant 'Ref <n>' button
	4. Tap File->Save As->Waveform
	5. Select the correct flash drive (Removable Media)
	6. Select the relevant Ref from the 'Source' pull-down menu
	7. Enter a file name for the Ref to be saved to
	8. Tap the 'Save' button

    After the new firmware has loaded, you can recall each .isf file
    to one of the reference waveforms, using the File->Recall->Waveform menu.

    Loading new firmware will not effect existing saved setups.

Installation Instructions:

    1.  Copy the 3SeriesMDO_V*.img file to the root folder of suitable USB
        media such as a USB flash drive.

    2.  Check to make sure there are no other files in that folder that
        have a file suffix of ".img". For example, there must not be any
        files named firmware.img. If you have multiple .img files, the
        oscilloscope may not load the correct one.

    3.  Turn the oscilloscope off.

    4.  Insert the USB media into either of the USB Host ports on the
        front of the oscilloscope. (The host port on the rear of the
        oscilloscope may also be used.)

    5.  Turn on the oscilloscope.

        After a few seconds, the screen should display a message stating
        that the firmware upgrade procedure is in progress.

        Do not turn off the oscilloscope or remove the USB media
        until prompted to do so! It will take around 10-20 seconds
	(depending on type and brand of media) before a second screen prompts
	you to remove the media and cycle power.

    6.  When the screen says that the upgrade is complete, turn off
        the oscilloscope.

    7.  Remove the USB media.

    8.  Turn on the oscilloscope.

	A screen will appear to let you know the firmware is being installed
	and that process takes around 4-5 minutes. While the firmware is being
	installed, various LEDs on the front panel will blink. Once the process
	is complete, the normal display will appear along with a dialog that
	says the firmware upgrade process has completed successfully.

	You can verify the new firmware was installed by opening the
	Help->About menu and confirming the firmware version number is
	correct.

   9.  Perform a Signal Path Compensation (SPC)

       On first power-up, the oscilloscope may prompt you to complete a
       Signal Path Compensation(SPC) operation.  The SPC process takes
       approximately 10 minutes.

       Do the following to start a Signal Path Compensation:
          a. Disconnect all analog, digital and RF probes from the oscilloscope
	     inputs
          b. Open the Utility->Calibration menu
	  c. If the oscilloscope was not previously operating, you should
	     wait 20 minutes for the oscilloscope internal temperature to
	     reach its normal operating temperature
          d. Tap the 'Run SPC' button
          e. Wait for SPC to complete

Troubleshooting:

    - If you try to load an older version of firmware, or the same
      version that is currently installed, the oscilloscope will not load
      the firmware and will display a message indicating the firmware on
      the USB media is not newer than the current firmware.

      You can override this, and force the oscilloscope to load an older
      firmware file, by creating an empty text file called "forceinstall.txt"
      on the USB media in the root or topmost folder.

    - If the firmware does not load, verify that the USB media is
      supported by the oscilloscope. Go to the File->Save As menu
      and attempt to save a setup to the USB media. If you cannot save
      and recall .set files, the USB media may not be supported.
      Try another brand of USB media. If other brands do not work,
      try one of the other USB host ports on the oscilloscope. There
      are two host ports on the front and one on the back of the
      oscilloscope.

    - If the firmware does not load and the USB media otherwise works
      fine, then the firmware file may be corrupted. Try downloading
      the firmware again.

    - If you are still unable to load the new firmware, please contact
      the Tektronix Technical Support Center. Customers calling within
      the U.S. call 1-800-833-9200 press 3. Worldwide, please visit
      www.tektronix.com to find contacts in your area.

    - New versions of firmware are released from time to time. Visit
      www.tektronix.com/software.