2.16 Frequency Display Disable/Enable
If there is some reason (such as classified testing) why it might be desired not to have the frequency of
operation displayed while measurements are being taken, this can be done by using the F3 key of MENU
(7) as a toggle for this function.
Pressing [MENU] (7) [F3] the first time will replace the frequency numbers at the bottom of the display
window with asterisks.
When you desire to return to the normal frequency display mode, press [MENU] (7) [F3] again and the
numbers indicating the frequency will return.
2.17 Non-Volatile Memory
The PPM Non-Volatile Memory is intended to Store front panel settings for later Recall. This is
particularly useful when complicated setups are in use. Usage of this feature can save many menu
selections that might otherwise have to be entered every time the instrument is used.
The PPM stores all front panel information pertaining to the present setup in a memory location called
Current Setup. When the PPM is turned off, Stored setups and the Current setup in memory are kept alive
by a Lithium battery (exceptions are detailed in Section 1.3). The battery will ensure that the contents of
the memory will be preserved for about six months.
When the PPM has been turned on and Self-Test either completed or bypassed, the opportunity will be
presented to select Last Setup at Turn-Off. If it is desired to use the PPM in the same manner as when it
was last used, this feature of the Non-Volatile Memory is very convenient. Other features of the
Non-Volatile Memory will be discussed next.
2.17.1 Memory Features
To access the Memory features of the PPM, press [MEM]. There are three levels of menus accessible by
sequentially pressing the MEM key. The menus accessed through the Memory key are detailed in
Appendix B. If you mistakenly access the Memory menu, press [CLEAR] to return to the Data Display
Mode.
Store Setup
The PPM has 10 Non-Volatile Memories for storing front panel setups. These are numbered from 1
through 10. To store the present PPM front panel setup in one of these 10 memories, press [MEM] (1)
[F2] [nn] [UNITS].
Where nn is the number of the memory where the setup is to be stored (between 1 and 10). If no number
were entered, the operation would be aborted when any Units key was pressed and the PPM would return
to data display.
Recall Setup
To Recall a previously stored setup, press [MEM] (1) [F1] [nn] [UNITS].
Where nn is the number of the memory to be recalled (from 1 to 10). If no number is pressed, the
operation is aborted when any Units key is pressed and the PPM will return to data display.
Get Power-On Setup
To retrieve from memory the front panel setup that was operative the last time the instrument was used
before power-off or the rear panel RESET button was used, press [MEM] (1) [F3]
Operation
Manual No. 20790, Rev C, November 1998
2-45
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