Atek HP 8753D, Руководство пользователя, Страница: 405 / 677

Commands That Require a Clean Sweep
Many front panel commands disrupt the sweep in progress . F or example , changing the channel
or measurement type . When the analyzer does execute a disruptive command in a sequence ,
some instrument functions are inhibited until a complete sweep is taken. This applies to the
following functions:
autoscale
data ! memory
F orward Stepping In Edit Mode
In the sequence modify mode , you can step through the selected sequence list, where the
analyzer executes each step .
Titles
A title may contain non-printable or special ASCII characters if you download it from an
external controller . A non-printable character is represented on the display as .
Sequence Size
A sequence may contain up to 2 kbytes of instructions . Typically , this is around 200 sequence
command lines . T o estimate a sequence's size (in kbytes), use the following guidelines .
Type of Command Size in Bytes
Typical command 2
Title string character 1
A ctive entry command 1 per digit
Embedding the V alue of the Loop Counter In a Title
Y ou can append a sequentially increasing or decreasing numeric value to the title of stored data
by placing a 4 DISPLA Y 5
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNN
TITLE
NNNNNNNNNNNNNN
MORE
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
LOOP COUNTER command after the title string. (Y ou
must limit the title to three characters if you will use it as a disk le name . The three-character
title and ve-digit loop counter number reach the eight-character limit for disk le names .)
This feature is useful in data logging applications .
A utostarting Sequences
Y ou can dene a sequence to run automatically when you apply power to the analyzer . T o
make an autostarting sequence , create a sequence in position six and title it \A UTO". T o stop
an autostarting sequence , press 4 LOCAL 5 . T o stop an autostarting sequence from engaging at
power on, you must clear it from memory or rename it.
The GPIO Mode
The instrument's parallel port can be used in two dierent modes . By pressing 4 LOCAL 5 and
then toggling the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PARALLEL [ ] softkey , you can select either the
NNNNNNNNNNNNNNNNNNNN
[COPY] mode or the
NNNNNNNNNNNNNNNNNNNN
[GPIO] mode .
The GPIO mode switches the parallel port into a \general purpose input/output" port.
In this mode , the port can be connected to test xtures , power supplies , and other peripheral
equipment that the analyzer can interact with through test sequencing.
Application and Operation Concepts 6-139