Selecting the Best MegOhmmeter that Suits Your Needs

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Insulators are designed to resist the flow of current from the central conductor towards the sheath of the electrical component. Insulators protect the components from developing shorts or electrocution of personnel. Insulators may develop defects that are not discernable after a while of continuous operation. It is a good idea to constantly check for insulator defects to prevent unexpected down time. This way, technicians can recondition the part and reduce operation delays. Reconditioning a faulty part is much easier and costs less compared to repairing a whole electrical system that has failed because of a defective electrical component.

To test for the reliability of insulators, technicians measure insulator resistance. A good insulator should have a very high resistance in order to isolate very high voltages.  However, after a while of operation, the insulator may crack, chaff, accumulate contaminants like dirt and grease or form water trees. This can be dangerous because unwanted currents could flow which may result in bigger problems.

When measuring for insulation resistance, a special device called a MegOhmmeter is used. You cannot use an ordinary Multimeter for measuring insulation resistance because of the limited range. A MegOhmmeter has a very high output voltage to effectively measure resistance in the MegOhm range. If you are looking for a good meter, you might want to check out MegOhmmeters from AEMC. The AEMC 1026 Digital Megohmmeter and AEMC 5060 5000V Megohmmeter are some of AEMC’s models that offer excellent accuracy and simple operation. Here is a comparison of the features to help you choose the best meter that suits your needs.

AEMC 1026AEMC 1026 Digital Megohmmeter

This digital/analog meter has an output voltage of 5000 volts and can automatically compute the Dielectric Absorption Ratio, Dielectric Discharge and Polarization Index. This allows a fast and simplified insulation diagnostics.

Features

  •        • Combination voltage of 500 V, 1000 V, 2500 V and 5000 V
  •       •  Automatic computation of DD, PI and DAR
  •       •  Adjustable output test voltage from 40 V to 5100 V
  •       •  Can measure resistance from 300 kΩ up to 10 TΩ
  •       •  Measures Leakage Current and Capacitance directly
  •        • Displays run time, voltage and resistance
  •        • Alarm functions
  •        • Programmable PI ratio and test run times
  •        • Automatic inhibition of test if the meter detects a live sample
  •        • Automatic display of discharge voltage
  •        • Dual read-out that displays voltage, time and test results
  •        • Durable double-wall weatherproof casing
  •        • Designed to comply with IEC standards
  •        • E 610010-1, 600 V Cat. III compliant

 

 

AEMC 5060AEMC 5060 5000V Megohmmeter

The 5060 5000V Megohmmeter features RS232 connectivity and internal storage. The RS232 port lets you hook the 5060 to a printer for direct printing of test results. The internal storage lets you store the measured results for future reference. These features make it suitable for field and substation applications.

Features

  •        • Combination voltage of 500 V, 1000 V, 2500 V and 5000 V
  •        • Automatic computation of DD, PI and DAR
  •        • Adjustable output test voltage from 40 V to 5100 V
  •        • Can measure resistance from 300 kΩ up to 10 TΩ
  •        • Measures Leakage Current and Capacitance directly
  •        • Displays run time, voltage and resistance
  •        • Alarm functions
  •        • Programmable PI ratio and test run times
  •        • Automatic inhibition of test if the meter detects a live sample
  •        • Automatic display of discharge voltage
  •        • Dual read-out that displays voltage, time and test results
  •        • Durable double-wall weatherproof casing
  •        • Designed to comply with IEC standards
  •        • E 610010-1, 600 V Cat. III compliant
  •        • RS232 connectivity
  •        • 128kB internal storage

 

If you are undecided on what meter to get, you might want to consider renting these testers to give you first-hand experience on their features and capabilities. That way you can determine if a tester meets your needs in real-world applications.

Protec Equipment Resources offers affordable test equipment rental to cater to your needs.  Please call a Protec specialist today for more details about our electrical test equipment rental services. You can reach us at 1-866-352-5550 for assistance.



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