Agilent Technologies 71501D, Руководство пользователя

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3-35
Eye-Diagram Analyzer Reference
Saving to Mass Storage
as long as the card’s battery has sufficient power. You should change the bat-
tery every two years using the procedure in this section. Refer to
“To Change a
Memory Card Battery” on page 3-39 .
RAM memory cards have a write-protect switch, on the end which is not
inserted into the display’s card slot. If this switch is slid toward the edge of the
card (marked "SAFE"), no changes may be made to the card’s content. If you
wish to write a new file to a card, or remove a file, slide its write-protect switch
toward the center of the card.
N o t e If no card is inserted in the front-panel card slot, and you attempt to catalog a
memory card, the display shows the message catalog open failed. Place a card
in the card slot, and retry the operation.
RAM Disks
RAM disks offer a convenient method of duplicating memory cards. Refer to
“To Duplicate a Memory Card” on page 3-41 . Up to 16 internal RAM disks can
be created. (These are numbered 0 through 15.) The default size of each RAM
disk is 32 kilobytes.
Use Instrument BASIC’s INITIALIZE statement to create each disk. The fol-
lowing example creates RAM disk zero:
INITIALIZE ":MEMORY,0,0",128
The second integer, 0, determines the RAM disk number. The value 128 repre-
sents the size of the RAM disk in sectors. Each sector consists of 256 bytes.
So, a value of 128 sectors creates a RAM disk of 32 kilobytes. A value of 512
sectors creates a RAM disk of 128 kilobytes.
Use the following command to create RAM disk 1 with a size of 128 kilobytes:
INITIALIZE ":MEMORY,0,1",512
C A U T I O N Because internal RAM is volatile, all RAM disks are deleted when the power is
turned off. When this happens, all files are lost and each RAM disk must be
recreated.