PicoScope 3425 PC Oscilloscope
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3.2.4.3
Streaming modes
The streaming modes are alternatives to
that can capture data
without gaps between blocks.
In a streaming mode, the computer prompts the PicoScope 3425 PC Oscilloscope to
start collecting data. The data is then transferred back to the PC without being stored
in oscilloscope memory. Data can be sampled with a period between 1 µs and 60 s,
and the maximum number of samples is limited only by the amount of free space on
the PC's hard disk.
There are two streaming modes:
3.2.4.4
Compatible streaming mode
Compatible streaming mode is a basic
that works with all
scope units, at speeds from one sample per minute to a thousand samples per
second.
The oscilloscope's driver transfers data to a computer program using either normal or
windowed mode. In normal mode, any data collected since the last data transfer
operation is returned in its entirety. Normal mode is useful if the computer program
requires fresh data on every transfer. In windowed mode, a fixed number of samples
is returned, where the oldest samples may have already been returned before.
Windowed mode is useful when the program requires a constant time period of data.
Once the oscilloscope is collecting data in streaming mode, any setup changes (for
example, changing a channel range or
setting) will cause a restart of the
data stream. The driver can buffer up to 32 K samples of data per channel, but the
user must ensure that the
function is called frequently
enough to avoid buffer overrun.
See
Using compatible streaming mode
for programming details.
Applicability
Does not support
.
The
function will always
return FALSE (0) in streaming mode.
3.2.4.5
Using compatible streaming mode
This is the general procedure for reading and displaying data in
:
1.
Open the oscilloscope using
2.
Select channel ranges and AC/DC switches using
3.
Start the oscilloscope running using
4.
Transfer the block of data from the oscilloscope using
5.
Display the data
6.
Repeat steps 4 and 5 as necessary
7.
Stop the oscilloscope using
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Содержание PicoScope 3425
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