User`s manual

Chapter 6 119
Advanced Operations
Increasing Measurement Throughput
Screen Display Time
Each time the screen being displayed on the Test Set (active screen) is
changed, it takes approximately 250 ms to access and draw the new
screen. Additionally, each time a field on the active screen is changed it
takes a finite amount of time to update the field. This update time is
depends on the length and type of field.
When the Test Set is operated in the External Automatic Control mode
it is possible to program it to only display a special “remote screen.”
When the Test Set is in this mode, only the remote screen is displayed,
regardless of the screen changes requested by the control program
running on the external controller. The remote screen mode has no
affect on the operation of the Test Set; all measurement modes,
commands, and so forth, still operate normally. The only effect is that
the active screen is never changed. This saves approximately 250 ms for
every :DISPlay command in the control program and some finite
amount of time for every field update.
When the remote screen is being displayed, the Test Set’s display is in
the “locked” state. When the control program on the external controller
unlocks the display, the screen is returned to the last remote screen
requested. The *RST Common Command will place the Test Set’s
display screen in the “unlocked” state. Pressing the LOCAL key causes
a locked Test Set display session to end and causes the Test Set’s
display screen to return to the unlocked state.
To Lock the Test Set’s Display Screen Use the :SPECial:DISPlay
'LOCKED'|'UNLOCKED' commands to lock and unlock the Test Set’s
display screen. 'LOCKED' causes the display to go to the remote screen
and ignore screen changes and other display updates thus saving time.
'UNLOCKED' causes the display to return to the last screen requested
by the remoter user. Further screen changes and display updates take
place as normal.
Example 6-11 Syntax
:SPECiaL:DISPlay ’LOCKED’
:SPECiaL:DISPlay ’UNLOCKED’
Example 6-12 Example
OUTPUT 714;"SPEC:DISP ’LOCKED’
This locks the Test Set’s display screen.
To Query the Lock/Unlock State of the Test Set’s Display
Screen Use the :SPECial:DISPlay? commands to query the
lock/unlock state of the Test Set display screen.