User manual

Front Panel Operation
2001-900-01 Rev. K/ August 2010 3-83
BURST-MODE
The burst mode is discussed in paragraph 3.8.1.
DATA-GROUP
This menu selection chooses the data items that are stored in
the buffer. To select it, highlight it with the cursor and press
ENTER. The following menu is displayed after a message
about changing the data group clearing the buffer:
BUFFER DATA GROUPING
FULL COMPACT
FULL: With this selection, for each reading, the following
information is stored: units, channel number (if applicable),
reading number, time-stamp, and status (overflow). The first
reading stored has a time-stamp of zero seconds; subsequent
readings are referenced to it.
****The “full” data group should be used for 6.5 digits or
greater resolution. It also allows you to change function,
range, or channel while storing.
COMPACT: With this selection, readings, units, reading
numbers, and status (overflow) are stored. This allows more
readings to be stored in the buffer.
“Compact” is only accurate and displayed to 5.5 digits. It
does not allow changes of function, range, or channel while
storing.
CONTROL
This menu item controls the type of data storage. It is
selected by highlighting it with the cursor and pressing
ENTER. The following menu is shown:
BUFFER CONTROL
FILL-AND-STOP PRETRIGGER
CONTINUOUS NEVER
FILL-AND-STOP: This control selection fills the buffer
with the requested number of readings and stops. You can
then recall the readings.
PRETRIGGER: This selection continuously stores
readings until a user-programmed trigger event occurs. It
then stores post-trigger readings. For example, with a buffer
size of 100 readings, there will be 50 readings stored before
the trigger event and 50 readings stored after the trigger.
The first reading after the trigger is reading zero. Pretrigger
readings have reading numbers and time-stamps with a
minus sign; post-trigger readings have reading numbers and
time-stamps with a plus sign.
Pretrigger control must be further configured. Selecting it
displays the following menu:
CONFIGURE PRETRIGGER
PERCENTAGE READING-COUNT EVENT
Percentage and reading-count specify the number of
readings to store before the trigger event, either as a
percentage of the total number of readings, or as a number of
pretrigger readings.
Event selects the source of the pretrigger, or “mark point”
event. This can be a Manual, GPIB, Trigger Link, or external
trigger.
CONTINUOUS: With this control selection, readings are
always stored in the buffer. The process continues, with the
oldest readings being overwritten in a circular manner, until
storage is interrupted with the EXIT key.
NEVER: Gets set to this if data storage has been interrupted.
Pressing the STORE key changes NEVER to FILL-AND-
STOP.
CLEAR-ALL
This action can be used at any time to clear the data buffer of
all stored readings and buffer statistics. Since the MEM1 and
MEM2 memory options are non-volatile, clear-all is the only
way for the operator to clear the reading buffer.
COUNT
With this menu selection, you specify the number of readings
to store. Highlighting it and pressing ENTER yields the
following display:
SET BUFFER SIZE
ENTER-COUNT USE-TRIGGER-MODEL
ENTER-COUNT: This item allows you to specify the
buffer size in number of readings.
USE-TRIGGER-MODEL: This selection lets you default
to the measure count in the present trigger configuration, as
long as the measure count is a finite value.
FEED
This selection allows you to select the source of readings to
be placed in the buffer. It has the following submenu:
CHOOSE BUFFER FEED
AFTER-CALC BEFORE-CALC NONE