Specifications

Note that the first ten elements of the CVT are unavailable. These are used by the
driver for internal data retrieval. However, all algorithms have access to the
remaining 502 elements. Data is retrieved from the CVT with:
DATA:CVT? (@10,12,14:67)
The format of data coming from the CVT is determined by the FORMat command.
The FIFO can store up to 65,024 real numbers. Each writefifo() or writeboth()
cause that expression to be placed into the FIFO. With a FIFO this large, many
seconds worth of data can be stored, dependent upon the volume of writes and the
trigger cycle time. The FIFO’s most valuable service is to keep the computer from
having to spend too much time acquiring data from the VT1419A. This is ideal for
Agilent VEE which has many other operator interactions and analysis to perform.
Agilent VEE can quickly read the buffered data when required. Data is retrieved
from the FIFO with:
DATA:FIFO:PART? <count>
The <count> parameter can be a number larger than the FIFO (up to 2.1 billion) if
reading data continuously with Agilent VEE READ transactions is desired. The
amount of data that is in the FIFO can also be queried using the
DATA:FIFO:COUNT? command.
Programming the VT1419A Multifunction
Plus
Retrieving Algorithm Data
82 Chapter 3
Note:
C
VT 0 - 9 unavailable
CVT 10
writecvt( <expr>, 10 );
writecvt( <expr>, 13 );
writeboth( <expr>, 14 );
writefifo( <expr> );
Current Value Table (CVT)
(502 Elements)
CVT 11
CVT 12
CVT 13
CVT 14
CVT 511
(65,024 elements)
First-in-First-Out Data Buffer
(
FIFO
)
Figure 3-9: Writing Algorithm Data to FIFO and CVT
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