82 Chapter 3
Basic Operation
Using Security Functions
The Enter Secure Mode softkey changes to Secure Mode Activated.
If Your Instrument is Not Functioning
If the instrument is not functioning and you are unable to use the security functions, you must physically
remove the processor board and optional hard disk, if installed, from the instrument. Once these assemblies
are removed, proceed as follows:
For the processor board, choose one of the following options:
• Discard the processor board and send the instrument to a repair facility. A new processor board will be
installed and the instrument will be repaired and calibrated. If the instrument is still under warranty, you
will not be charged for the new processor board.
• If you have another working instrument, install the processor board into that instrument and erase the
memory. Then reinstall the processor board back into the non-working instrument and send it to a repair
facility for repair and calibration. If you discover that the processor board does not function in the
working instrument, discard the processor board and note that it caused the instrument failure on the
repair order. If the instrument is still under warranty, you will not be charged for the new processor
board.
For the optional hard disk, choose one of the following options:
• Discard the hard disk and send the instrument to a repair facility. Indicate on the repair order that the
hard disk was removed and must be replaced. A new hard disk will be installed and the instrument will
be repaired and calibrated. If the instrument is still under warranty, you will not be charged for the new
hard disk.
• Keep the hard disk and send the instrument to a repair facility. When the instrument is returned, reinstall
the hard disk.
For procedures on removing and replacing the processor board and hard disk, refer to the E4428C/38C ESG
Signal Generators Service Guide.
Using the Secure Display
This function prevents unauthorized personnel from reading the instrument display and tampering with the
current configuration through the front panel. The display is blanked , except for the message *** SECURE
DISPLAY ACTIVATED *** (see Figure 3-6 on page 83), and the front panel keys are disabled. Once this
function is activated, the power must be cycled to re-enable the display and front panel keys.
To apply this function, press
Utility > Display > More (1 of 2) > Activate Secure Display > Confirm Secure Display
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