Testing Frequencies

• Interference may require a trial attempt at different frequencies to find the right one that will allow the test to be completed without interference. Press the "Up Arrow" to increase the frequency of the test current. If decreasing the test current is a better option, press the "Down arrow" to do so. The type of test being performed should be considered when adjusting frequencies. If a new frequency doesn't eliminate the interference, it will be obvious at the beginning of the testing procedure.
  
  

Current Option

• Higher levels of current may cause more interference during some tests. If a there is a spike in current, it may alter the test results. These factors are controlled by setting the testing device to use only high or low currents. To adjust the current settings, use the center "Up Arrow" key to access the "Options Menu" on the left side of the display. Press the same arrow key again to move between the "Hi Current" and "Lo Current" options. Leave the selection on the "Hi Current" option to select it. This setting will prevent the test results from being altered by a high current spike.
  
  

Electrical Noise

• Electrical noise occurs during random fluctuations of electrical signals. This noise can interfere with the ability of a measuring device to register electrical currents. Megger testing tools are designed to reduce electrical noise that can affect the reading by allowing the operator to press the center "Arrow" key and then select the "Filter" menu. Press the same key again to turn the filter on and reduce the noise interference. It is important to note that the time required to complete the testing will be increased greatly with the filter on.
  
  

Equipment Care

• While Megger testing equipment is designed with several features that can be adjusted to ensure accurate readings, it is also important to take proper care of the testing equipment. Leads should not be twisted or stored in a manner that leaves them kinked. Probes should be cleaned and dried before storage to prevent build-up of corrosion. Proper care of the equipment will ensure the testing adjustments will be applied correctly to the tests.