Agilent Technologies 8719D, User Manual

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of available. (For information on special option which increases the amount of
available memory to 2 MB, contact your HP sales associate.)
If you have deleted registers since the last time the instrument was preset, the bytes available
for you to use may be less than the actual “bytes free” that is displayed. Deleting registers
to increase the available memory will work in cases where the registers being deleted and
the registers needing to be added are of the same standard size (such as instrument states not
having calibrations associated with them). In certain other cases, however, you may have to
press after deleting registers so that the “bytes free” value equals the available memory
value. During a preset, the analyzer a memory packer that de-fragments the free memory
into one contiguous block.
12-1 shows the memory requirements of calibration arrays and memory trace arrays
to help you approximate memory requirements. For example, add the following memory
requirements:
n
a full calibration with 801 points (58 k)
n
the memory trace array (4.9 k)
l
the instrument state (approximately 6 k)
The total memory requirement is 68.9 kbytes. There is sufficient memory to store 29
calibrations of this type. However, the same calibration performed with 1601 points and 2
channels uncoupled would require 255 k bytes:
l
a full calibration with 1601 points, two channels, uncoupled (230 k)
n
the memory trace array (19 k)
n
the instrument state (approximately 6 k)
Only 2 of these calibrations could reside in memory before the available memory would be
depleted.
12-1.
Memory Requirements of Calibration Memory Trace Arrays
Variable
Calibration Arrays
Response and Isolation
l-Port
X-Port
Interpolated Cal
as above in addition to regular
Power Meter
x 2 x number of
Data
Memory Trace Array*
2.5 4.9 9.7
19
state’
number of points
This variable is allocated once per active channel.
The number of points that was set at the time the was turned on.
If the channels are coupled, this number is always 1. If the channels are uncoupled, this number
refers the number of channels that have power meter on.
This value may change with revisions.
Approximate (Bytes)
401 pts 801 pts 1601
29
10
10 19
19 38
58
115 230
l k 1.8 3.4 6.6
State and Memory Allocation