Tektronix 1502C - Page 57

Operator Performance Checks
2–8
1502C MTDR Service Manual
O
N
ac 0.000 ft
O
F
F
O
F
F
O
F
F
Figure 2–11: Waveform Centered, Cursor at 0.000 ft
If the risetime is out of specification, it might be difficult to make accurate
short-distance measurements near the front panel.
1. Set the 1502C front-panel controls:
NOISE FILTER 1 avg
VERT SCALE 500 m r /div
DIST/DIV 0.2 ft/div (0.05 m)
Vp .99
2. Using the
n o
POSITION control, move the incident pulse to the center of the
display as shown below.
O
F
F
O
F
F
O
F
F
O
N
ac –1.432 ft
Figure 2–12: Pulse Centered on Display
3. Turn the VERT SCALE control clockwise until the leading edge of the incident
pulse is five major divisions high (about 205 m r ).
4. Position the waveform so that it is centered about the middle graticule line.
7. Risetime Check
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