Fluke 1623-2 Manual - Page 35

How to Troubleshoot, Table 6. Troubleshooting

Get Fluke 1623-2 PDF manuals and user guides View all Fluke 1623-2 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 35 highlights

Earth/Ground Tester How to Troubleshoot 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. 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. 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. 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 " " symbol is displayed - measurement results are valid. If not, a reset occurs. Hint: Replace batteries. Use 6 alkaline AA-type (LR6) batteries. 5. Is your RA 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. 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. 27 MyFlukeStore Shop for Fluke products online at: www. .com 1.877.766.5412

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
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.
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.
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.
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 “
” symbol is displayed – measurement results
are valid. If not, a reset occurs.
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.
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.
Shop for Fluke products online at:
1.877.766.5412
www.
MyFlukeStore
.com