Agilent Technologies 4288A, Руководство по программированию

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224 Appendix B
Information for Replacing 4278A with 4288A
Functional Comparison and GPIB Command Correspondence
Display
Functional comparison
The following table shows the functional comparison related to the display.
The display (LCD) of the 4288A is smaller than that of the 4278A. This prevents the
4288A from simultaneously displaying all of the items that can be displayed at one time
with the 4278A, as shown in Table B-12. Since the 4278A and the 4288A employ totally
different display methods, there is no compatibility of the usage related to the setup of
items to be displayed.
For items that are described as “not displayed” in Table B-12 and items that are not
described in Table B-12, you can check their setup status by calling the screen to set up the
value for each item (performing key operation for setup). This is possible for both the
4278A and 4288A.
4278A 4288A
Displayed items
*1
Display format:
Measured value display format
(MEAS PAGE),
Classification display format (SORT
PAGE),
Compensation value display format
(STATUS PAGE),
Limit table display format (LIMIT
PAGE)
Monitor line:
Select from 6 values.
Display format:
Only the format in which the
measured value and the instrument
setup indicated with the
▼
symbol are
displayed
Instrument setup display area:
Select from 34 display pages.
ON/OFF state for displaying
measured value
Unavailable Available
Number of display digits for
measured value
4, 5, or 6 digits 4, 5, or 6 digits
Method to display measured
value
(Selecting fixed/floating
point display
*2
)
Only fixed point display (display using
the fixed point location, which depends
on each measurement range)
Fixed point display (display using the
user-designated fixed point location
regardless of the measurement range),
display using the floating point
location (changes depending on the
measured value)
Deviation
display of
measured value
(deviation
measurement
mode)
Primary
parameter
Percentage display of the deviation
relative to the reference value
(measured value - reference value) only
Deviation (measured value - reference
value) display, percentage display of
deviation relative to the reference
value
Secondary
parameter
Unavailable
Deviation (measured value - reference
value) display, percentage display of
the deviation relative to the reference
value
*1.For items displayed in each display format, refer to Table B-12.
*2.In the 4278A’s fixed point display, the decimal point is fixed to an appropriate place for
each range. This enables you to obtain an optimized display for several different mea-
surement ranges. On the other hand, in the 4288A’s fixed point display, the decimal
point is fixed to a certain place regardless of the measurement range. Therefore, you
need to set up a proper decimal point place (the value of the highest digit) each time you
change the measurement range. As Table B-13 shows, the value of the highest digit to
operate the 4288A’s fixed point display is the same as that of the 4278A.