OMICRON 31
Step and touch voltage measurements
7. Start the current injection loop by pressing the I/O button on the front panel of the CPC 100.
8. a) If you measure according to EN 50522, place the metal plate on the ground and step on it.
b) If you measure according to IEEE 81, drive the ground rod approximately 150 mm into the ground,
one meter away from the object under test.
9. Connect the probe to the object under test.
Note: It is important to establish a good contact to the object. This could sometimes be cumbersome
if the object is painted with an insulating layer. One option is to remove the layer with a file. The
HGT1’s filter adapts to the connected impedance. The adaption results in a temporary increase of
the voltage over the entire frequency spectrum. Hence, by starting the measurement BEFORE the
probe is connected to the object, faulty values could be measured, since the values during adaption
of the filter could be higher than the values actually caused by the injected current.
10.Start the measurement on the HGT1.
Note: Make sure that the filter is only being adapted once in the duration of the measurement. A
deteriorated probe could cause connection problems, resulting in several adaptions of the filter during
the measurement. By using a proper, pointed probe, this problem can be avoided.
11.Either trigger the CPC 100’s next current injection with the walkie-talkie as described before or wait
for the next current injection loop to begin.
Current is injected for 2 seconds at 30 Hz and 70 Hz respectively. The highest measured value is
kept by the HGT1 for every frequency.
Note: If the mains frequency is 60 Hz, the current is injected at 40 Hz and 80 Hz respectively.
12.Stop the measurement on the HGT1 as soon as the highest value has been detected at 70 Hz.
13.Remove the probe from the object under test.
14.Save the measurement point on the HGT1.
15.Move to the next location and repeat steps 8 to 14.
16.After all tests have been performed, open the CPC 100 file (xml-file) and the txt-file from the HGT1
with the corresponding Excel template (Step&Touch using HGT1.xlt) from the CPC 100 Start Page
in the section Test Templates. Check the test results carefully. The cell comments in the test report
sheet help you to assess the test results.
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