3-6. DISPLAY
The following paragraphs define the display fields and describe the display formats and data
displayed on the LCD.
3-6-1. DISPLAY FIELD DEFINITIONS
The 4278A has a 40 character by 16 line LCD display.
The last six character spaces of each line are reserved for the softkey labels. This entire
area is referred to as the SOFTKEY field.
The lowest line of the softkey field displays the MORE field. This field indicates the number
of softkey pages available, and which softkey label page is presently displayed. For exam-
ple, if four levels of softkey label pages are available, and the first softkey label page is dis-
played, 1/4 will be displayed, indicating page one of four pages. Pressing the PREV or
NEXT keys will display the previous or next set of softkey labels.
The row to the left of the softkey area is the MARKER field. A marker ( 0- ) will be displayed
beside• the selected softkey label.
The 4278A's settings and measurement results are displayed on the rest of the display--33
characters wide, from the left-hand side of the LCD. The first five lines from the top is the
STATUS field. The fields for measurement frequency (FREO : 1 kHz or 1MHz), test signal
voltage (OSC LVL :), setting of the 1MHz high accuracy mode (HI ACC: on or off), measure-
ment range (RANGE :), A -D conversion time settings (INTEG TIME : SHORT, MEDIUM or
LONG), number of measurements to be averaged (AVG :), delay time (DELAY :), and com-
parator setting (COMPTR : on or off) are displayed in the status area.
The next seven lines comprise the MEASUREMENT DATA field. Measurement results are
displayed in this field. The top and bottom of lines of the measurement data field are not
used.
The line immediately below the measurement data field is also part of the STATUS field. The
trigger mode (TRIG : INT, MAN, or EXT) and cable length settings (CABLE : Om, lm, or 2m)
are displayed on this line.
The next line is the INPUT LINE (third line from the bottom of the LCD), and numeric data
input using the front panel keys will be displayed on this line.
The second line from the bottom of the LCD is the MONITOR LINE, and compensation data
will be displayed on this line.
The bottom LCD line is the MESSAGE LINE, and comments and error messages will be
displayed here.
Figure 3-3 shows the display fields.
3-7
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