HP 8753D, User Manual, Page: 636 / 678

Storing Data to Disk
Y ou can use the internal disk drive or connect an external disk drive for storage of instrument
states , calibration data, measurement data, and plot les . (Refer to Chapter 4, \Printing,
Plotting, and Saving Measurement Results", for more information on saving measurement data
and plot les .)
The analyzer displays one le name per stored instrument state when you list the disk
directory . In reality , several les are actually stored to the disk when you store the instrument
state . Thus , when the disk directory is accessed from a remote system controller , the directory
will show several les associated with a particular saved state . The maximum number of les
that you can store on a disk depends on the directory size . Y ou can dene the directory size
when you format a disk. See T able 12-3 for the default directory size for oppy disks and hard
disks .
The maximum number of instrument states and calibrations that can reside on a disk is
limited by the available disk space . T o see the available disk space displayed on the analyzer ,
press 4 SA VE/RECALL 5 . (Be sure you have selected either
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
INTERNAL DISK or
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
EXTERNAL DISK
depending on your disk type .) In the upper righthand portion of the display , the value
displayed as Bytes free: is the available disk space . If your disk is formatted in LIF , this
value is the largest contiguous block of disk space . Since the analyzer is reporting the largest
contiguous block of disk space , you may or may not see the bytes free number change when
you delete les . If your disk is formatted in DOS, the number reported as bytes free is the total
available disk space . That number is updated whenever you save to or delete les from the
disk.
A disk le created by the analyzer appends a sux to the le name . (This is on the analyzer's
directory and is not visible .) The sux consists of one or two characters: the rst character is
the le type and the second is a data index. (Refer to T able 12-2 for the denitions of each
sux character .)
T able 12-2. Sux Character Denitions
Char 1 Denition Char 2 Denition
I Instrument state
G Graphics 1 Display graphics
0 Graphics index
D Error corrected data 1 Channel 1
2 Channel 2
R Raw data 1 to 4 Channel 1, raw arrays 1 to 4
5 to 8 Channel 2, raw arrays 5 to 8
F F ormatted data 1 Channel 1
2 Channel 2
C Cal K Cal kit
1 Cal data, channel 1 0 Stimulus state
1 to 9 Coecients 1 to 9
A Coecient 10
B Coecient 11
C Coecient 12
2 Cal data, channel 2 0 to C same as channel 1
M Memory trace data 1 Channel 1
2 Channel 2
If correction is on at the time of an external store , the calibration set is stored to disk. (Note
that inactive calibrations are not stored to disk.) When an instrument state is loaded into the
12-4 Preset State and Memory Allocation