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Operator Tutorial
2–12
1502C MTDR User Manual
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ac 40.000 ft
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Figure 2–15: Noise Reduced
5. Increase the NOISE FILTER setting to 128.
NOTE. The higher the setting, the more time the instrument takes to average the
waveform.
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ac 40.000 ft
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Figure 2–16: Noise Reduced to Minimum
6. Move the
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POSITION control and notice how averaging restarts at a low
value to allow easy positioning.
The 50 W terminator was used here because it gives a good impedance match.
Because there are no large discontinuities, it appears to the instrument as an
endless cable. The noise seen in this demonstration is noise picked up on the
cable and a tiny amount of internal noise in the 1502C. When testing cables, the
noise filter is extremely effective in reducing noise.