Name: PICO PicoScope 3000 A Series
Brand: PICO
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Prog ramming the 3000A Series oscilloscopes8

2.7.1

Block mode

In block mode, the computer prompts a PicoScope 3000A Series oscilloscope to

collect a block of data into its internal memory. When the oscilloscope has collected

the whole block, it signals that it is ready and then transfers the whole block to the

computer's memory through the USB port.

Block size. The maximum number of values depends upon the size of the

oscilloscope's memory. The memory buffer is shared between the enabled channels,

so if two channels are enabled, each receives half the memory. If three or four

channels are enabled, each receives a quarter of the memory. These calculations

are handled transparently by the driver. The block size also depends on the number

of memory segments in use (see ps3000aMemorySegments).

For the PicoScope 3000 MSOs, the memory is shared between the digital ports and

analog channels. If one or more analog channels is enabled at the same time as one

or more digital ports, the memory per channel is one quarter of the buffer size.

Sampling rate. A PicoScope 3000A Series oscilloscope can sample at a number of

different rates according to the selected timebase and the combination of channels

that are enabled. See the PicoScope 3000 Series User's Guide for the specifications

that apply to your scope model.

Setup time. The driver normally performs a number of setup operations, which can

take up to 50milliseconds, before collecting each block of data. If you need to

collect data with the minimum time interval between blocks, use rapid block mode

and avoid calling setup functions between calls to ps3000aRunBlock, ps3000aStop

and ps3000aGetValues.

Downsampling. When the data has been collected, you can set an optional

downsampling factor and examine the data. Downsampling is a process that reduces

the amount of data by combining adjacent samples. It is useful for zooming in and

out of the data without having to repeatedly transfer the entire contents of the

scope's buffer to the PC.

Memory segmentation. The scope's internal memory can be divided into segments

so that you can capture several waveforms in succession. Configure this using

ps3000aMemorySegments.

Data retention. The data is lost when a new run is started in the same segment,

the settings are changed, or the scope is powered down or the power source is

changed (for flexible power devices).

See Using block mode for programming details.

PICO PicoScope 3000 A Series Programmer's Guide

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