Specifications

Chapter 3 29
Specifying Measurement Conditions
Setting How the Instrument Displays Measurement Results
(Enabling/Disabling Deviation Measurement Mode)
3. Specifiying Measurement
Conditions
Setting How the Instrument Displays Measurement Results
(Enabling/Disabling Deviation Measurement Mode)
You can have the instrument display measurement results as absolute values or as
deviations relative to the reference value (deviation measurement mode). You can change
this setting for each of the measurement parameters 1 through 4 (:PAR1 through :PAR4).
To make this selection, use the following command:
• :CALC:PAR{1-4}:EXPR:STAT on page 229
In deviation mode, you can set the instrument to display deviations as they are or as
percentages relative to the reference value. To make this selection, use the following
command:
• :CALC:PAR{1-4}:EXPR:NAME on page 229
To set the reference value for deviation mode, use the following command:
• :CALC:PAR{1-4}:EXPR:CENT on page 228
How the instrument displays measurement results differs according to the settings made
with the above two commands, as summarized in the table below.
where and mean the following:
: Measured value
: Reference value (set with the :CALC:PAR{1-4}:EXPR:CENT command)
NOTE When you use a GIPB command, such as the :FETC? command on page 280, to retrieve
measurement values, the above settings are applied to the values displayed on screen.
When you are testing DUTs while using the bin sorting function, the instrument always
displays measurement results as they are, regardless of the above settings. See Figure 6-5,
“4287A's data processing flow,” on page 77.
Setting with the
:CALC:PAR{1-4}:EXPR:STAT command
OFF or 0 ON or 1
Setting with the
:CALC:PAR{1-4}:EXPR:NAME
command
——— DEV PCNT
How measurement results are displayed
Meas Meas Ref–
Meas Ref–
Ref
----------------------------
100´
Meas Ref
Meas
Ref