RIGOL DS1000B - Manual (Page 83)

Command Systems RIGOL
Programming Guide for DS1000B Series 2-71
only NORMal and MAXimum mode is available and the system is in STOP state.
 600 points are returned in common operation（+, －, ×）while 500 points are returned
in FFT operation in all modes (NORMal, RAW, MAXimum).
 The waveform data read in NORMal mode is fixed as 600 points while the system is in
STOP state, if increase the time base until all the waveforms are displayed on the screen,
some invalid data may be contained in data returned under the circumstances. So, you
are recommended to read the data in RAW mode while in STOP state.
Example:
:WAV:DATA? CHAN1
Read the data from CH1.
3. :WAVeform:POINts
Command Format:
:WAVeform:POINts
:WAVeform:POINts?
Function:
This command sets the waveform points need to be returned, the default is 0.
has different Value ranges in different modes.
NORMal: 0~600
RAW: 0~8192 or 0~16384 (in half channel state)
NOTE: Half channel indicates selecting one of the channels in CH1 and CH2, or in CH3 and
CH4.
Returned Format:
The query returns an integer, for example: 10.
NOTE:

If you set the waveform points to be 0, the query will return the maximum points in
current mode (NORMal: return 600 points, RAW: return current memory depth);
 In MATH operation, 600 points are returned no matter what mode it is;
 In FFT, the maximum points will always be 500.
Example:
:WAV:POIN 20 Set the waveform points as 20.
:WAV:POIN? Return 20.