Tektronix Telescope 1502C Instrukcja Użytkownika Pobierz pdf (Strona 62)

Operator Tutorial

2–12

1502C MTDR User Manual

ac 40.000 ft

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.

ac 40.000 ft

Figure 2–16: Noise Reduced to Minimum

6. Move the

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.

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Tektronix Telescope 1502C Instrukcja Użytkownika Strona 62