Technical data

8-2
Preset State and Memory Allocation
Introduction
Introduction
This chapter contains information about instrument settings that occur when
•the Preset key is pressed
• a preset command is sent over GPIB
• an instrument power-cycle occurs
You can also find information in this chapter on saving instrument states to internal memory locations, or to
internal or external disks.
Preset State
When the Preset key is pressed, the analyzer reverts to a known state called the factory preset state. This
state is defined in Table 8-1 on page 8-3. There are subtle differences between the preset state and the
power-up state. These differences are documented in Table 8-3 on page 8-10. If power to non-volatile
memory is lost, the analyzer will have certain parameters set to default settings. The affected parameters
are shown in Table 8-4 on page 8-10.
When line power is cycled, the analyzer performs a self-test routine. Upon successful completion of that
routine, the instrument state is set to the conditions shown in Table 8-1. The same conditions are true
following a “PRES;” or “RST;” command over GPIB, although the self-test routines are not executed.
You also can create an instrument state and define it as your user preset state:
1. Set the instrument state to your desired preset conditions.
2. Save the state (save/recall menu).
3. Rename that register to “UPRESET”.
4. Press Preset, PRESET:USER.
The Preset, key is now toggled to the USER, selection and your defined instrument state will be recalled
each time you press Preset, and when you turn power on. You can toggle back to the factory preset
instrument state by pressing Preset, and selecting FACTORY.
NOTE When you send a preset over GPIB, you will always get the factory preset. You can,
however, activate the user-defined preset over GPIB by recalling the register in which it is
stored.