Procedures for Testing with the DX Host
106 Baker DX 71-030 User Guide EN V10 www.megger.com
As the voltage decreases, the PD pulses decrease. At the point where less than 50 percent of the
surge pulses have a PD pulse, the software records the current surge voltage level as RPDEV. As
the voltage continues to ramp down, the software continually records the current surge voltage
level at which a PD pulse is detected. The last recorded value is saved as the PDEV (the lowest
voltage at which the detector sees a PD pulse).
Figure 118. Example of acquired extinction voltages (PDEV and RPDEV); single coil mode testing.
Results shown in expanded view.
10. When you acquire the extinction thresholds, discontinue the test and save the results.
11. Repeat the process for additional coils as needed.
Alternatively, you can use the single-coil testing process for testing subsequent coils after setting
a reference coil using the ramp-up process just described. This process is commonly used when
testing for PD using a go/no go approach. If PD is recorded during the process, you can re-test
the suspect coil using the ramp-up approach to get a closer view at PD activity.
1. Using a known good coil, when you obtain a satisfactory waveform, touch the Set
Reference icon and then touch the ZS Override icon.
NOTE: Refer to “Determining a Known-good Coil to Use as a Reference” earlier in this chapter for more
information on identifying a known good coil and using the reference features.
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