Version Number
The system firmware, which is the resident program that is
stored in non-volatile memory, has been updated on sev-
eral occasions over the life of the Model 4400 Testing Sys-
tem. In order for some of the option functions and features
described in Chapter 6 to work properly, the firmware
must have a certain version date. This requirement is noted
in the description of the options in Chapter 6.
To determine the version date of your firmware, use the
following key sequence at the front panel of the console:
S1, 9, ENTER
When the S1 and 9 are pressed, the setup display on the
Main Panel shows “SL 9". Then, when the 1 is pressed,
the display shows the month and year of the installed
firmware:
“12–93"
If the firmware has been customized just for your sys-
tem, a leading minus sign is added to the displayed date:
“–12–93"
Function of
Controls
Version Number
4-31
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