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Saving
and
Recalling
Data
from
the
Memory
Card
The memory card provides additional memory for saving instrument states,
traces, display images, limit-line tables, amplitude correction factors, and
programs. Each HP 822158 battery-backed RAM card provides 128 kilobytes
of memory. Several different memory cards are available with up to
512 kilobytes of memory. See “Accessories” in Chapter 9. Instrument states,
traces, display images, limit-line tables, amplitude-correction factors, and
programs are easily retrievable without the need for an external controller to
transfer data.
The process of saving and recalling data from the memory card is similar
to saving and recalling data from the cable TV analyzer memory. Due to
the expanded capabilities of the memory card, there are some important
differences. For example, data is stored in cable TV analyzer memory as an
item; on the memory card data is stored as a logical interchange
file
(LIF).
Memory card data can be stored and recalled using a prefix. A prefix is
an optional user-defined label for states, traces, and programs. The prefix
becomes part of the
llle
name. If you do not specify a prefix, the file name
will be created without it. Table 3-2 compares the save and recall operations
of cable TV analyzer memory and the memory card.
Refer to
Table
3-3 at the end of this section for a summary of saving and
recalling data to and from cable TV analyzer memory.
3-15