Tektronix Telescope 1502C Manual de usuario descargar pdf (Pagina 59)

Operator Tutorial

1502C MTDR User Manual

2–9

50 W impedance plus 9.5 W series resistance. You can check this by putting a

known reference on the end of the cable and measuring its impedance with

ohms-at-cursor. The difference between the actual reading and the expected

reference reading is the series resistance.

59.5 W

408.000 ft

Ohms-at-Cursor

Readout

Figure 2–10: Ohms-at-Cursor

7. Turn the

POSITION control to set the cursor near the beginning of the

cable. In this example, the ohms-at-cursor reading is 50.9 W at 17.880 feet.

There is less loss at the beginning of the cable because there is less series

resistance.

50.9 W

17.880 ft

Figure 2–11: Ohms-at-Cursor Near Beginning of Cable

8. Turn the

POSITION control clockwise to set the cursor past the reflected

pulse. Note that the ohms-at-cursor reading is ≥1 kW.

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Tektronix Telescope 1502C Manual de usuario Pagina 59