Operator Performance Checks
2–10
1502C MTDR Service Manual
O
F
F
O
F
F
O
F
F
O
N
ac –1.624 ft
Jitter
Figure 2–15: Jitter Apparent on Leading Edge of Incident Pulse
Using the Max Hold function (accessed in the Setup Menu, Acquisition Control) can
simplify your observation of jitter. Max Hold allows you to observe the accumulated
jitter without having to stare continuously at the display.
O
F
F
O
F
F
O
F
F
O
N
ac –1.624 ft
Jitter
Accumulated
Figure 2–16: Jitter Captured Using Max Hold
If the instrument failed Jitter or Risetime checks, it is probably still adequate for all
but extremely precise distance measurements. If it failed the Horizontal Scale check,
you should not use the instrument until the cause of the failure has been identified
and corrected.
All of the previous checks only test the major functional blocks of the instrument
that could prevent you from being able to make measurements. It is possible for the
front-panel controls or the LCD to have problems that would interfere with
controlling or displaying measurements. Most problems of this type would become
evident as you perform the checks. If you suspect a problem of this nature, you
should have the instrument checked by a qualified service technician, using the
diagnostics in the 1502C Service Manual.
If the instrument passed all of the previous checks, it is ready for use.
Conclusions
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