Tektronix 1502C Telescope User Manual


 
Operator Tutorial
212
1502C MTDR User Manual
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ac 40.000 ft
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Figure 215: 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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Figure 216: 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.