3-6-8. NON-NUMERIC DISPLAY
The 4278A may display "UNBAL" or "" in the place of the numeric measurement data.
When the impedance (or the admittance) of the capacitor exceeds the range of the analog
measurement circuit's capability, "UNBAL" will be displayed. When the analog measurement
circuit can measure the capacitor, but the data format (the number of display digits) is not
enough for the calculated result, "" will be displayed and is called overflow.
3-7. TREE STRUCTURE OF THE SOFTKEY LABELS
The 4278A's softkeys are nested to a maximum of four levels.
When you press a softkey which has lower levels of softkeys, the softkey labels automatical-
ly change to the next lower level. When you press the 'return' softkey, the softkey labels
change to the next higher level. When you press a softkey which doesn't have lower levels
of softkeys, the function of the softkey will be selected or a function will be executed.
When two or more softkey pages are available, the order of the softkey page and the num-
ber of the same level softkey pages, divided by a slash (/) are displayed. By pressing the
PREV or NEXT key, the softkey page and the softkey order number will be changed. When
you press the MENU key, the softkey page is returned to the first softkey page.
NOTE
When editting the comparator function limit table or when performing the self test,
the MENU key cannot be used. Press the 'exit LIMIT' or the 'exit TEST' softkey
first.
The 4278A's softkey tree is shown in Appendix B.
3-12
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