16 Chapter 1
Getting Started
Installing Option 215
Getting Started
How to Predict Your Memory Requirements
If you plan to install many optional personalities, you should review
your memory requirements, so you can determine whether you have
enough memory. There is an Agilent “Memory Calculator” available
online that can help you do this, or you can make a calculated
approximation using the information that follows. You will need to
know your instrument’s installed memory size as determined in the
previous section and then select your desired applications.
For PSA series see: http://www.agilent.com/find/psa_firmware
Select the “Memory Calculator” link. You can try any combination of
available personalities to see if your desired configuration is compatible
with your installed memory.
NOTE For PSA: After loading all your optional measurement personalities,
you should have a reserve of ~2 MBytes memory to facilitate mode
switching. Less available memory will increase mode switching time.
For example, if you employ excessive free memory by saving files of
states and/or data, your mode switching time can increase to more than
a minute.
You can manually estimate your total memory requirements by adding
up the memory allocations described in the following steps. The
compare the desired total with the available memory that you identified
in the previous section.
1. Program memory - Select option requirements from the table
“Personality Options” on page 17.
2. For PSA only: shared libraries require 5.68 MBytes
3. For PSA only: recommended mode swap space is 2 MBytes
4. Screens - .gif files need 20-25 kB each
5. State memory - State file sizes range from 21 kB for SA mode to 40
kB for W-CDMA. The state of every mode accessed since power-on
will be saved in the state file. File sizes can exceed 150 kB each when
several modes are accessed, for each state file saved.
TIP State memory retains settings for all states accessed before the Save
State
command. To reduce this usage to a minimum, reduce the modes
accessed before the
Save State is executed. You can set the PSA to boot
into a selected mode by assessing the desired mode, then pressing the
System, Power On/Preset, Power On keys and toggle the setting to Last.
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