Operator Performance Checks
1502C MTDR Service Manual
2–9
O
F
F
O
F
F
O
F
F
O
N
ac –0.848 ft
Crosses
Lowest
Point
Figure 2–13: Cursor on Lowest Major Graticule that Rising Edge Crosses
5. Using the
n
o
POSITION control, and noting the distances displayed, verify that
the distance between the points where the leading edge crosses the highest and
lowest major graticule lines is less than or equal to 0.096 feet (0.029 m).
O
F
F
O
F
F
O
F
F
O
N
ac –0.768 ft
Crosses
Highest
Point
Figure 2–14: Cursor on Highest Major Graticule that Rising Edge Crosses
In the above example, the distances are –0.848 feet and –0.768 feet. The difference
between these two measurements is 0.080 feet, which is well within specification.
Jitter is the uncertainty in the timebase. Its main effect is that the waveform appears
to move back and forth a very small amount. If the jitter is too great, it will affect
the repeatability of very precise distance measurements.
1. Set the VERT SCALE less than or equal to 1.0 m
r
/div.
2. Watch the leading edge of the pulse move and verify that this movement is less
than five pixels, or < 0.02 ft (0.006 m).
8. Jitter Check
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
