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1-15

IM 701610-01E

Functions

Acquisition Modes <Section 7.2, 7.4>

When storing sampled data in the acquisition memory, it is possible to perform

processing on specified data and display the resultant waveform. The following data

processing methods are available.

Normal Mode

In this mode, sampled data are stored in the acquisition memory without processing.

Averaging Mode

Averaging is a process in which waveforms are acquired repeatedly to obtain the

average of waveform data of the same timing (the same time in relation to the trigger

point).

If this mode is active, the instrument takes the linear or exponential average of incoming

data and writes the results into acquisition memory. You can set an average count of

Infinite for exponential averaging, or in the range from 2 to 65536 (in 2n steps where n is

a natural number) for simple averaging. Set the attenuation constant for exponential

averaging in the range from 2 to 256 (2n steps where n is a natural number).

An = {(N - 1) An - 1 + Xn}

Exponential Averaging (Count = Infinite)

AN =

Linear Averaging (Count = 2 to 65536)

n = 1

Σ Xn

: Value Obtained After nth Averaging

: nth Measured Value

: Attenuation Constant

(2 to 256, in steps of 2

)

: nth Measured Value

: Number of Averaging Times

(Acquisition Count,

in steps of 2

)

This averaging process is useful when you want to eliminate random noise.

Envelope Mode

In normal mode and averaging mode, the sample rate (the number of times data is

acquired per second in the acquisition memory) drops if T/div is increased (see Appendix

1 “Relationship between the time axis setting, sample rate and record length”).

However, in the envelope mode, the maximum and minimum values are determined at

every time interval from the data sampled at 200 MS/s (high-resolution mode: 100 MS/s).

The time interval used to determine the values is the twice sampling interval of the

normal mode. The maximum and minimum values are paired and acquired in the

acquisition memory.

Envelope mode is useful when you want to avoid aliasing (section 1.2), since the sample

rate is kept high irrespective of the time axis setting (T/div). Furthermore, envelope

mode is also useful when you want to detect glitches (pulsing signals which rise very

fast) or display an envelope of a modulating signal.

Envelope

1.4 Setting the Acquisition and Display Conditions

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