Philips PM3350A - Page 74

4 APPLICATIONS 4 - 41
PROCESS AVERAGE menu
With this function you can suppress noise without loosing bandwidth. Every dot
is calculated after every sweep in the following way:
measured - previous
new = previous + .
C
In this formula "previous' is a sample on the same position of the previous
sweep- "C is the average-factor; the bigger C is, the slower the dot positions
change. The following values for C can be selected: 2, 4, 8, 16, 32, 64, 128 or
256.
Once activated, AVERAGE is a continuous process until it is switched off. The
process is started again when the INIT softkey is pressed or when the triggering
or amplitude control is changed. In this case the display memory is cleared.
In SINGLE SHOT trigger mode the number of acquisitions is equal to the average
factor C.
In ROLL mode, AVERAGE is temporarely switched-off. This is indicated by the
message:
AVERAGE suspended because of ROLL mode
During AUTOZOOM, AVERAGE is also temporarely switched-off. This is then
indicated by the message.
AVERAGE suspended because of AUTOZOOM
In this case, the AVERAGE process can be re-activated again by pressing the
RETURN key. This is indicated by the message;
AVERAGE re-actIvated
Activating or de-activating of the AVERAGE process can be done by using the
ON/OFF softkey.
4.3 MENUS AND MEASUREMENTS