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Acquiring Waveforms

TDS5000 Series User Manual

3-21

Setting Acquisition Controls

This section reviews the features that start and stop data acquisitions and the

features that control how the oscilloscope processes the data as it is acquired.

The following acquisition modes are available:

H Sample: The oscilloscope does no postprocessing of acquired samples. The

first sample from each acquisition interval is saved. An acquisition interval

is the time covered by the waveform record divided by the record length.

Sample mode is the default mode.

H Peak Detect: The oscilloscope alternates between saving the lowest sample

in one acquisition interval and the highest sample in the next acquisition

interval. This mode only works with real-time, noninterpolated sampling.

H Hi Res: The oscilloscope creates a record point by averaging all samples

taken during an acquisition interval. Hi Res results in a higher-resolution,

lower-bandwidth waveform. This mode only works with real-time, noninter-

polated sampling.

A key advantage of Hi Res mode is its potential for increasing resolution

regardless of the input signal. Table 3--1 indicates that you can obtain up to

15 significant bits with Hi Res mode. Note that the resolution improvements

are limited to speeds slower than 40 ns/div.

Table 3- 1: Additional r esolution bits

Time base speed Bits of resolution Bandwidth

40 ns and faster 8bits >550 MHz

80 ns to 200 ns 9bits >110 MHz

400 ns to 1 s 10 bits >22 MHz

2 sto4s 11 bits >5.5 MHz

10 sto20s 12 bits >1.1 MHz

40 s 13 bits >550 kHz

100 s to 200 s 14 bits >110 kHz

1 s and slower 15 bits <55 kHz

H Envelope. As waveforms are acquired, the oscilloscope continually retains

the running minimum (Min) and maximum (Max) values in adjacent sample

intervals, creating an envelope of the number of waveforms you specify.

Once the specified number of waveforms is reached, the data is cleared and

the process starts over. This is similar to Peak Detect mode, except that

Envelope mode gathers peaks over many trigger events.

Acquisition Modes

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