Sampling modes
15
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ps2000pg.en-12
PicoScope 2000 Series Programmer's Guide
3.3
ETS (Equivalent Time Sampling) mode
ETS
is a way of increasing the effective sampling rate when working with repetitive signals. It
is controlled by the
functions.
ETS works by capturing many instances of a repetitive waveform, then combining them to
produce a composite waveform that has a higher effective sampling rate than the individual
instances. The maximum effective sampling rates that can be achieved with this method are
listed in the data sheet specifications for your oscilloscope.
Because of the high sensitivity of ETS mode to small time differences, you must set up the
trigger to provide a stable waveform that varies as little as possible from one capture to the
next.
Applicability
PicoScope 2104, 2105, 2203, 2204, 2204A, 2205 and 2205A
oscilloscopes.
As ETS returns random time intervals, the
function must be used. The
function will return FALSE (0).
Stable, repetitive signals only.
3.3.1
Using ETS mode
This is the general procedure for reading and displaying data in
1.
Open the oscilloscope using
.
2.
Select channel ranges and AC/DC coupling using ps2000_set_channel.
3.
, set the trigger if required.
4.
Set ETS mode using
5.
Start the oscilloscope running using
6.
Poll the driver to find out when the oscilloscope has finished collecting data, using
.
7.
Transfer the block of data from the oscilloscope using
.
8.
Display the data.
9.
Repeat steps 6 to 8 as necessary.
10.
Stop the oscilloscope using
11.
before the oscilloscope is ready, no capture will be available and the driver will
not return any samples.
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