Kistler-Morse KM L-Cell Bolt-On - Manual (Page 80)

Appendix E. Troubleshooting
E-3
Problem Problem Details Solution
Using a Digital Multimeter (DMM) or
ohmmeter, check for shorts to ground as
follows:
1. Set meter resistance scale to accom-
modate maximum measured range.
2. Disconnect junction box wires from
signal processor.
3. With one lead to earth ground and
other lead to white wire, check resis-
tance on disconnected junction box
wires:
• If reading is less than infinite (i.e.,
there is resistance), short is
indicated; proceed to Step 4 to
identify location.
• If no short is indicated, investigate
other explanations for problem.
4. Starting with junction box closest to
signal processor in daisy chain,
disconnect wires connecting junction
box to other junction boxes. With one
lead to earth ground and other lead to
white wire, check resistance on wires
leading from junction box:
• If reading is less than infinite (i.e.,
there is resistance), short is
indicated; proceed to Step 5 to
identify location.
• If no short is indicated, proceed to
next junction box in daisy chain,
disconnecting wires connecting it to
other junction boxes and checking
resistances. Perform for each
junction box down chain until short
is located; proceed to Step 5 to
identify location.
5. Disconnect L-Cell wires for one L-Cell
from above identified junction box. With
one lead to earth ground and other lead
to white wire, check resistance on
disconnected L-Cell wires:
• If reading is less than infinite (i.e.,
there is resistance), short is
indicated. Replace shorted L-Cell.
• If no short is indicated, disconnect
next L-Cell wires from junction box
and check resistances. Repeat for
each L-Cell wired to junction box
until short is located. Replace
shorted L-Cell.
Fluctuations can be caused
by short to ground Small Amplitude
Changes or Erratic
Fluctuations in
display readings