2.4 Real-time averaging (AVG option)
20
U5303A User's Manual
2.4 Real-time averaging (AVG option)
Introduction
Averaging signals reduces random noise effects, improving the signal-to-noise ratio, as well as
increasing resolution and dynamic range.
The averaging is performed by accumulating successive recorded waveforms.
The number of waveforms to be accumulated and the record length are defined by user. The
waveforms are successively acquired and stored in a record. The accumulation of all the waveform
records results in an "accumulated record" which is provided in output.
The main features are:
Synchronous, single-channel and dual-channel, real-time sampling and averaging up to
3.2 GS/s
Averaging from 1 up to 520'000 triggers, in steps of 8 triggers (excepted when using less than 8
triggers). Some possible values are 1, 2, 3, 4, 5, 6, 7, 8, 16, 24, 32, … triggers
Effective acquisition length from 1 up to 480 KSamples in interleaving mode or up to
240 KSamples per channel in dual-channel
Noise suppressed accumulation (NSA)
Self-Trigger mode for minimal synchronous (pattern) noise
Baseline stabilization algorithm and digital offset
Timing sequence
The minimum time between summed events depends on the trigger
Rearm Time
as specified in the
U5303A
.
Figure 2.3 -
Timing sequence in real-time averaging mode.
The current solution supports a single accumulated record.
The number of potential trigger lost between two acquisitions depends on several factors:
The time needed to perform the last accumulation
AVG Dead Time
, which depends on the
number of samples acquired. The
AVG Dead Time
can be estimated at
#Samples
x 2.1 [ns]
for SR2, or at
#Samples
x 1.77 [ns] for SR3.
