Saving and Recalling Data from the Memory CardThe 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.