Fluke Fluke 4325170 Manual De Usuario
Los códigos de productos
4325170
Earth/Ground Tester
How to Troubleshoot
27
How to Troubleshoot
Follow the steps in Table 6. See Figure 11 for steps 1-5.
Table 6. Troubleshooting
Step Description
1. External voltage (Uext) too high
If the external voltage applied to the instrument is too high, usually from leakage currents in the
system under test, no measurement can be started (see Specifications for Uext limit).
Hint: Reposition probe (S/P2) and restart measurement.
system under test, no measurement can be started (see Specifications for Uext limit).
Hint: Reposition probe (S/P2) and restart measurement.
2. Auxiliary earth electrode resistance (RH) too high
If the auxiliary earth electrode resistance is too high it is not possible to drive the current
necessary for reliable measurements. The measurement is blocked (see Specifications for Rh
limit).
Hint: Check connection of test lead with terminal H/C2, check auxiliary earth stake.
necessary for reliable measurements. The measurement is blocked (see Specifications for Rh
limit).
Hint: Check connection of test lead with terminal H/C2, check auxiliary earth stake.
3. Probe resistance (Rs) too high
If the probe resistance is too high measurements are not reliable. The measurement is blocked
(see Specifications for Rs limit).
Hint: Check connection of test lead with terminal S/P2, check probe stake.
(see Specifications for Rs limit).
Hint: Check connection of test lead with terminal S/P2, check probe stake.
4. Weak batteries
If the batteries are weak, the supply voltage may break down during measurement. If there is
enough energy to complete the measurement “
enough energy to complete the measurement “
” symbol is displayed – measurement results
are valid. If not, a reset occurs.
Hint: Replace batteries. Use 6 alkaline AA-type (LR6) batteries.
Hint: Replace batteries. Use 6 alkaline AA-type (LR6) batteries.
5. Is your R
A
measurement result reliable?
Probe S/P2 must be outside the potential gradient areas of E/C1 and H/C2 for accurate
measurements. Normally a probe distance of more than 20 m is sufficient. However, in some
environmental conditions where the soil resistivity is variable, this may not be sufficient. To be
sure, reposition the probes and take several measurements. If the readings are approximately
the same, your measurement results are reliable. If not, increase the probe distance.
measurements. Normally a probe distance of more than 20 m is sufficient. However, in some
environmental conditions where the soil resistivity is variable, this may not be sufficient. To be
sure, reposition the probes and take several measurements. If the readings are approximately
the same, your measurement results are reliable. If not, increase the probe distance.
6. Is the result of a “Stakeless ground loop measurement” reliable?
Ensure that you have the correct inducing clamp (see Accessories).
The clamp parameters are suited for this test method. An undefined clamp will give incorrect
results.
Ensure that the recommended minimum distance between the current clamp is kept. If the
clamps are positioned too close together, the magnetic field of the inducing clamp will influence
the sensing current clamp. To avoid mutual influencing, the distance between the clamps can be
varied and a new test performed. If the measurement values vary only a little or not at all, the
value can be regarded as reliable.
The clamp parameters are suited for this test method. An undefined clamp will give incorrect
results.
Ensure that the recommended minimum distance between the current clamp is kept. If the
clamps are positioned too close together, the magnetic field of the inducing clamp will influence
the sensing current clamp. To avoid mutual influencing, the distance between the clamps can be
varied and a new test performed. If the measurement values vary only a little or not at all, the
value can be regarded as reliable.