Teledyne LeCroy WaveExpert 100H Operators Manual - Manual (Page 190)

Operator’s Manual
188
WE-OM-E Rev A
1 st sweep (no old average yet): new average = (new data +0 * old average)/(0 + 1) = new
data only.
2 nd sweep: new average = (new data + 1*old average)/(1 + 1) = 1/2 new data +1/2 old
average.
3 rd sweep: new average = (new data + 2 * old average)/(2 + 1) = 1/3 new data + 2/3 old
average.
4 th sweep: new average = (new data + 3 * old average)/(3 + 1) = 1/4 new data + 3/4 old
average.
5 th sweep: new average = (new data + 4 * old average)/(4 + 1) = 1/5 new data + 4/5 old
average.
6 th sweep: new average = (new data + 4 * old average)/(4 + 1) = 1/5 new data + 4/5 old
average.
7 th sweep: new average = (new data + 4 * old average)/(4 + 1) = 1/5 new data + 4/5 old
average.
In this way, for sweeps > 4 the importance of the old average begins to decrease exponentially.
Note: The number of sweeps used to compute the average will be displayed in the bottom line of the trace descriptor label:
To Set Up Continuous Averaging
1. In the menu bar, touch Math, then Math Setup... in the drop-down menu.
2. Select a function tab from F1 through Fx. [The number of math traces available depends
on the software options loaded on your scope. See Specifications.]
3. Touch inside the Source1 field and select a source waveform from the pop-up menu.
4. Touch inside the Operator1 field and select Average from the Select Math Operator
menu.
5. Touch the Average tab in the dialog to the right of the "Fx" dialog, touch the Continuous
button.
6. Touch inside the Sweeps data entry field and enter a value using the pop-up keypad. The
valid range is 1 to 1,000,000 sweeps.
To Set Up Summed Averaging
1. In the menu bar, touch Math, then Math Setup... in the drop-down menu.
2. Select a function tab from F1 through Fx. [The number of math traces available depends
on the software options loaded on your scope. See Specifications.]
3. Touch inside the Source1 field and select a source waveform from the pop-up menu.
4. Touch inside the Operator1 field and select Average from the Select Math Operator
menu.
5. Touch the Average tab in the dialog to the right of the "Fx" dialog, then touch the Summed