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3 - 42 USING THE COMBISCOPE INSTRUMENTS
3.8 Time Base Control
In the digital mode, the SENSe:SWEep:TIME:AUTO command allows you to
enable autoranging of the main timebase (MTB).
3.8.1 Number of samples
The TRACe:POINts command allows you to set the number of sample points,
which is the total acquisition length for all traces. The number of samples is limited
to discrete values; refer to the TRACe:POINts command reference for a detailed
specification of these values. After a
*
RST command, the number of samples
is 512.
Note: If the number of samples is changed, the contents of all trace memories
is cleared. So, all previously stored traces are lost!
PROGRAM EXAMPLE:
CALL Send(0, 8, "
*
RST", 1) ’
Acquisition length = 512 samples.
CALL Send(0, 8, "TRACe:POINts CH1,8192", 1) ’
Acquisition lengthd = 8192 samples.
3.8.2 Time base speed
The SENSe:SWEep:TIME command specifies the time base of a sweep, which is
the time duration of one complete trace acquisition. Because the
SENSe:SWEep:TIME values are limited in the digital mode by permitted MTB
values, only particular values can be specified with this command. Refer to the
SENSe:SWEep:TIME command reference for a detailed specification of these
values.
Together with the number of trace points (TRACe:POINTs), the
SENSe:SWEep:TIME command determines the Main Time Base (MTB). The
MTB is expressed in seconds per division. Since there are 50 points in each
division, the MTB can be calculated from the following equation:
MTB = 50
*
SENSe:SWEep:TIME / (TRACe:POINts -1 )