Tektronix Telescope 1502C Manual de usuario descargar pdf (Pagina 61)

Operator Tutorial

1502C MTDR User Manual

2–11

Noise

On a longer cable, “grass” might appear on the displayed waveform. This is

primarily caused by the cable acting as an antenna, picking up nearby electrical

noise.

1. Set the 1502C front-panel controls:

CABLE 3-ft cable

NOISE FILTER 1 avg

VERT SCALE 500 mr

DIST/DIV 1 ft (0.25 m)

Vp .66

POSITION 40.000 ft

2. Attach the 50 W terminator to the end of the test cable using the female-to-

female BNC adaptor (both of these items are supplied with the instrument).

3. Increase VERT SCALE to 1.00 mr. Use the

POSITION control to keep

the waveform on the display. As the VERT SCALE setting increases, there

will be noise in the form of a moving, fuzz-like waveform with a few

random spikes.

ac 40.000 ft

Figure 2–14: Noise on the Waveform

4. Turn the NOISE FILTER control clockwise to 8. This will average out much

of the noise.

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Tektronix Telescope 1502C Manual de usuario Pagina 61