Giga-tronics 8003, Operation Manual

Page: 79 / 258

Operation
Manual 20791, Rev. C, June 2001 2-43
[ SEARCH]
Menu F5: Searches for and places a cursor at a user-defined level on the entry channel. When
cursor
∆
is active, SEARCH will look for and place a cursor at the user-defined level relative to the
reference cursor.
When this softkey is pressed, the cursor capability will be turned on if it is off. The entry area of the
display will show the current search value for the entry channel and allow it to be changed.
The softkey menu will change to F5-1 as shown in Figure 2-12.
[
SEARCH VALUE]
Menu F5-1: The Search Value is the value for the entry channel that the search function will
look for when a search is requested. If a cursor
∆
is active, the search will be for the level rela-
tive to the cursor. If the cursor
∆
is not active, the search will be for the level that is equal to
the search value.
When [ SEARCH VALU ] is pressed, the entry area of the display will indicate the current
search value for the entry channel and present a prompt to enter a new search value as desired.
[ SEARCH LEFT]
and
[SEARCH RIGHT]
Menu F5-1 : Initiates the search function. If the cursor
∆
is active, the 8003 will search in the
indicated direction (left or right) from the current position of the cursor. It will look for the
level that is equal to the search value in relation to the level at the cursor
∆
. If the cursor
∆
is
not active, the 8003 searches in the appropriate direction from the current position of the cur-
sor to look for the level that is equal to the selected search value.
When the search has completed, the trace will be put on hold. The hold can be turned off by
pressing any front panel key. This hold is provided to allow the trace to be examined in the
same state as it was when the search was conducted. While in the hold state, the entry area of
the search was conducted. While in the hold state, the entry area of the display will show the
power level and a message indicating whether the search was successful, the message will be
Value Found: Trace HOLD. If the search was unsuccessful, the message will be “
Error:
Cursor Value not Found
” and the cursor will not have moved.
Once a search has been completed, the search value can be changed and the same search (left
or right) conducted by entering a new search value. If it is desired to exit the trace HOLD state
that follows a search, this can be done by pressing a number key. The entry area of the display
will show the number being entered. A search value can then be entered in a similar manner as
pressing the search value softkey. The significant difference is that once the number entry is
completed, the search value is changed and a new search is initiated.
To enter a new search value, but not initiate the same type of search again, the
[
SEARCH VALUE ] softkey should be pressed.
[ BANDWIDTH (BW)]
Menu F5-1: If the BW search value is a negative dB value, pressing [ BANDWIDTH ] initiates
both a right and a left search simultaneously, starting from the maximum power level of the
entry channel trace. If the BW search value is a positive dB value the searches are performed
similarly, only starting from the minimum power level of the entry channel trace.