Teledyne LeCroy WaveRunner XI SERIES Operator’s Manual - Manual (Page 131)

O
PERATOR
’
S
M
ANUAL
WRXi-OM-E Rev C
131
Continuous Averaging Setup
1. In the menu bar, touch Math, then Math Setup... in the drop-down menu.
th traces available depends on the software
the Source1 field and select a source waveform from the pop-up menu.
th Operator menu.
ht of the Fx dialog, touch the Continuous button.
0
g Setup
the pop-up menu.
ge is 1 to 1,000,000
distinguish closely spaced
ving-
owever, it is more efficient concerning bandwidth and pass-band filtering. Use ERES on single-
data record is slowly repetitive (when you cannot use averaging). Use it to reduce
eably noisy, but you do not need to perform noise measurements. Also use it when
rements: zooming with high vertical gain, for example.
proves vertical resolution by a fixed amount for each filter. This
tive. The
he
rovide fast computation, excellent step
r
b
r
ters of the six filters are given in the following table.
2. Select a function tab from F1 through Fx The number of ma
options loaded on your oscilloscope. See Specifications..
3. Touch inside
4. Touch inside the Operator1 field and select Average from the Select Ma
5. Touch the Average tab in the dialog to the rig
6. Touch inside the Sweeps field and enter a value using the pop-up keypad. The valid range is 1 to 1,000,00
sweeps.
Summed Averagin
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 oscilloscope. See Specifications..
ct a source waveform from 3. Touch inside the Source1 field and sele
4. Touch inside the Operator1 field and select Average from the Select Math Operator menu.
button. 5. Touch the Average tab in the dialog to the right of the Fx dialog, then touch the Summed
ng the pop-up keypad. The valid ran 6. Touch inside the Sweeps field and type in a value usi
sweeps.
Enhanced Resolution
ERES (Enhanced Resolution) filtering increases vertical resolution, allowing you to
voltage levels. The functioning of the instrument's ERES is similar to smoothing the signal with a simple, mo
average filter. H
shot waveforms, or where the
noise when your signal is notic
you perform high-precision voltage measu
How the Instrument Enhances Resolution
The instrument's enhanced resolution feature im
real increase in resolution occurs whether or not the signal is noisy, or your signal is single-shot or repeti
signal-to-noise ratio (SNR) improvement you gain is dependent on the form of the noise in the original signal. T
enhanced resolution filtering decreases the bandwidth of the signal, filtering out some of the noise.
The instrument's constant phase FIR (Finite Impulse Response) filters p
esponse in 0.5 bit steps, and minimum bandwidth reduction for resolution improvements of between 0.5 and 3
its. Each step corresponds to a bandwidth reduction factor of two, allowing easy control of the bandwidth
esolution trade-off. The parame
Resolution
increased by
-3 dB Bandwidth
(× Nyquist)
Filter Length
(Samples)
0.5 0.5 2
1.0 0.241 5
1.5 0.121 10
2.0 0.058 24
2.5 0.029 51
3.0 0.016 117