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HOW TO USE THE INSTRUMENT 4 - 55
MATHEMATICS FILTER
- Press the ANALOG key to select the digital mode.
- Press the MATH menu key.
The MATH menu is displayed on the screen. Observe that MATH 1 is the default.
- Press the softkey next to MATH 1 to enter the MATH 1 submenu.
This menu is used to select one of the four mathematic functions: ’add, sub, mul,
filter’.
Observe that the default process for MATH 1 is the ’filter’ function. Typical use of
the digital low-pass filter is to suppress noise even after a (single shot) acquisition
has to be captured.
You can select between the acquired signal or a stored signal to be the source.
The trace information in the source trace is mathematically filtered by a low-pass
filter.
The resulting trace is automatically stored in memory location ’m1 and displayed
on the screen.
- Turn the TRACK control to select ’acq’.
- Press the ’ENTER’ softkey.
- Press the key next to ’on off’ to turn MATH 1 on.
- Turn the TRACK control to change the cut-off frequency.
- Switch off MATH 1 again before continuing to the next section.
ST6745
CH1
200mV
MTB
200µs
ch1
CH1
200mV
MTB
200µs
ch1
1-
1-
TRACK
3dB=4.25kHz
3dB=11.2kHz