16
Items in
bold italics
type are editable states or decimal values. Decimals are
denoted by
d
.
Move vertically via the
, keys. Move horizontally via
ENTER and ESC.
2.4.2
Data Store
The Model 2835-C allows a user to save up to 1000 measurements for each
channel for a total of 2000 measurements. These measurements are stored in
an internal buffer for subsequent viewing or transmission over a computer
interface. A separate buffer is maintained and configured for each channel.
Data is maintained on power down, but lost when a new configuration is
loaded, Section 2.4.3, or when the buffer is cleared via the CLR DATA BUFFER
command or when data with new units is being stored.
The data store buffer operates in two ways: SLIDE or FIX. In SLIDE configura-
tion, the buffer slides along storing the most recent measurements up to the
size of the buffer. Beyond this, as data enters the buffer, the oldest data is
pushed out and lost. In FIX configuration, data storing continues until the data
buffer is full. After this, data acquisition stops and no additional data can be
stored without first clearing the buffer via the CLR DATA BUFFER command.
DATA BUFFER CLR is displayed when the buffer is empty.
The size of the buffer is set by the D_BUF_SIZE
dddd
menu function. Edit the
value
dddd
to establish the number of data points that the buffer will hold
before dropping old data or stopping data storage.
Data storing is enabled by the user via the DATA STORE menu function. Edit
the
ON, OFF
condition to enable or disable data storing and the associated
STORE annunciator.
When in CONT mode, data acquisition and storage is resumed immediately
upon exiting the menus if acquisition is active as the menu is entered. When
acquisition is not active when the menu is entered, or when in SNGL or INTG
mode, data acquisition and storage requires an initiating R/S key press,
external trigger or a remote RUN command upon exiting the menu.
Buffer data can be viewed via the VIEW DATA menu command. Data are dis-played
in the measurement area while the message area displays the position within the
buffer:
dddd
of
dddd
. Use the
, keys to move through the buffer data. The
value
dddd
= 0001 is the first, i.e. the oldest datum.
NOTE
When DATA STORE is off, CONT acquisition mode behavior defaults to the
condition where data acquisition is begun without the requirement of a
starting trigger. SNGL acquisition modes always require a trigger for each
acquisition.
Table 8 – Data Store Operations
Menu Operation
Keypad Commands
Associated Remote Commands
DATA STORE
ON, OFF
Edit
ON, OFF
status.
DSE_n, DSE_n?
DATA BUFFER CLR or
CLR DATA BUFFER
If CLR DATA BUFFER,
DSCLR_n
press ENTER to clear buffer
SLIDE, FIX
BUFFER
Edit
SLIDE, FIX
BUFFER
DSBUF_n, DSBUF_n?
D_BUF_SIZE dddd
Edit D_BUF_SIZE
dddd
DSSZ_n, DSSZ_n?
VIEW DATA
Press ENTER and use
DS_n?, DSCNT_n?, DSUNITS_n?
, keys.
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