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where Fn
latest average amplitude value in display units
n
current sample number
new amplitude entry from analyzer (Trace C)
The new amplitude value, yn, is weighted more heavily by the last average amplitudeij, _ 1 than the new
amplitude entry, yn.
When n equals the limit set (e.g. 100, the preset limit), the last average amplitude is gradually replaced with new
data. Thus, the average will follow a slowly changing signal response, particularly if the sample limit is small.
Trace C
Video averaging requires the use of trace memory C. When video averaging is activated, the input signal response
is written into trace C, the averaging algorithm is applied to these amplitudes and the results written into TRACE A.
Thus, two traces are displayed: the input signal in C and the averaged signal in A.
Trace C may be blanked without affecting the operation of video averaging.
Trace C may be written into as traces A and B if a video average sample limit of one is selected.
If either trace A or B is in a write trace mode, the analyzer response will also be written into trace C.
EXTERNAL AND VIDEO TRIGGER
The front panel (.,l and m trigger
sweeptimes less than 20 msec. To eliminate the automatic refresh feature:
For external triggering: Press B 1111
For video triggering: Press (,,,, b
LOCKING SAVE REGISTERS
After saving instrument states in one or more of the six registers, 1 through 6, the registers can be secured from
being written over and destroyed. The recall function is not affected.
Unlocked: m &j
When locked, an attempt to [,,, will write "SAVE LOCK" on the CRT and no DATA entry can be made.
Press (,,rl) k
automatically keep the display refreshed in zero frequency spans for
modes
L o c k : m (m
Manual Operation 103
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