Sensor SMT-200 Operation And Technical Manual page 77

SENSOR
Io
--Test results--
No. 10
Temp 24.2
Imp 2104 ohm
<2069>
<2153>
+/- New Ref
Now Testing
Cont Imp....
--Test results--
No. 10
Temp 24.2
1724 ohm
Imp
<2069> <2153>
+/- New Ref
Now Testing
Cont Imp....
This is very effective with series strings. Series parallel strings are a little more difficult as the good
branches tend to mask the bad one. In this case isolate the branch by laying down all the phones
within a branch to locate the bad branch. From there, once the suspect branch has been isolated,
proceed as above.
TIP: When running the continuous impedance for fault finding use the +/- key instead of the
. Using the
ENTER/START
memory. This technique can also be applied to regular tests as well.
SMT-200 Operations and Technical Manual 2.00/R1
•
Next, invert each geophone one at a time and compare the
measured impedance value. The aim is to look at relative changes,
o
C
•
If there is one particular element that differs significantly from the
rest then consider this one as suspect. If all subsequent elements
o
C
read high or low then consider the first one as suspect. You may
have used the bad geophone to establish a reference.
ENTER/START
key will cause the result of the test to be logged to the internal
Section 5 Geophone Testing
67