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19.2.1 Average
The oscilloscope accumulates multiple waveform frames and calculates the average as
the result. If a stable trigger is available, the resulting average has a random noise
component lower than that of a single-shot record. The more frames that are accumulated,
the lower the noise is.
Note: Average acquisition is only valid for repetitive periodic signals, and it is important to
ensurethat the waveform is triggering in a stable way when using average mode.
19.2.2 ERES
The oscilloscope filters the sample, which rejects noise in the high-frequency domain, so
the signal-to-noise ratio (SNR) is improved. As a result, the effective number of bits
(ENOB) of the oscilloscope is enhanced.
ERES operation does not require the signal to be periodic or repetitive, nor does it require
stable triggering, but due to the digital filtering, the system bandwidth of the oscilloscope
will reduce when acquiring data in ERES mode. The higher the enhanced bits, the lower
the bandwidth. The following table shows the relationship between ERES bits and
bandwidth:
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T3DSO2000A Manual. Page 122
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