Oscilloscope R eference Mask Hit Count
Mask Hit Count
Each mask can have a m aximum of 16 segments. Segments can overlap. The number of mask hits is the
sum of all hits in all segments, regardless of whether or not segments overlap. If a waveform crosses over
an area where
two segments overlap, both segments will count the waveform hit.
When you set Hit Count to on, the counts w ill appear in the Pass/Fai l Test Summary
(see page 229).
Mask menu
Use the Mask menu commands to setup or edit or a user mask.
Math arbitrary filters
This section describes the library of FIR filters that are available for use under the ArbFilt <x>( <
fsource waveform>) function in the Tektronix oscilloscope waveform math section. The user may
find this under the path:
C:\Users\[Username]\Tektron ix\TekScope\Mat h Arbitrary
Filter
s\<filename>
.Thefilename of each filter identifies its type as low pass, high pass, etc
andalsoidentifies its normalized cutoff frequency or other identifying factors. The precise magnitude
characteristics of these filters are shown in the following graphs. These are all linear phase filters.
You can use the Math Equation Editor
(see page 265) to set up a waveform filter.
Low pass filters
The following graphs show the available set of low pass filters. Their normalized frequency response is
shown from 0 to ½ the sample rate. These filters will operate at any sample rate with cutoff frequency
scaled as shown below on the graphs. The filters have normalized cutoff frequencies of 0.05, 0.1, 0.15,
0.20, 0.25, 0.3, 0.35, 0.40, and 0.45. Stop band rejection is typically between –50 and –60 dB.
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 857
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