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Extech Instruments MG500 User Manual Download Page 13

MG500-en-GB_v1.3   3/17

 

13 

Insulator Measurement Considerations 

Insulators may get contaminated over time from a mixture of dust and moisture. Dust and 

moisture problems lower the resistance of the insulator as this resistance is in parallel with the 

insulator resistance. It is recommended that the insulator be measured first without the optional 

guard lead, to verify that the total resistance is high.  Should the total resistance not be high 

enough, the contaminants should be removed or the insulator replaced. Test the dirty insulator 

for proper resistance by testing with the optional guard lead. Note: If cleaning the insulator is 

possible, follow the procedure of the manufacturer. 

 

 

DIRTY INSULATOR

 

ELECTRICAL EQUIVALENT  

CIRCUIT DIRTY INSULATOR 

 

TYPICAL TEST 

 

 

 

 
 
 

Notes: 

Resistance as a result of contamination can lower the total resistance. 

Cleaning periodically can reduce system power consumption. 

 

 

 

 
 
 

Shop for Extech products at:

1.800.561.8187

ShopExtech

.ca

Summary of Contents for MG500

Page 1: ...USER MANUAL 10KV Digital High Voltage Insulation Tester Model MG500 Shop for Extech products at 1 800 561 8187 ShopExtech ca ...

Page 2: ... either power system grounding during periods of lightning activity or any non insulated system or non insulated circuit In the event that lightning occurs stop all testing and isolate and remove any temporarily installed test spikes or test leads Preparations for testing power system grounding or close to it can leave personnel vulnerable to exposure caused by faults at or fed from the system und...

Page 3: ...High Voltage Digital Insulation Meter This instrument must only be used and operated by competent trained personnel and in strict accordance with the instructions and safety practices Liability is not accepted for any damage or injury caused by misuse or non compliance with instructions and safety procedures This instrument must not be used on live circuits Ensure all circuits are de energized bef...

Page 4: ...by the tester upon completion of a test The discharge can be observed on the instrument s bargraph display Automatic Battery Test When the instrument is first powered ON a test circuit applies a heavy current draw on the batteries for a few seconds and measures the voltage in order to determine the capacity of the batteries The result is shown on the display Normal Operation Mode Considerations Th...

Page 5: ...oltage preset button 6 Power OFF button 7 Voltage adjustment button 8 5KV test voltage preset button 9 TEST START STOP button 10 2 5KV test voltage preset button 11 500V test voltage adjust button 12 Power ON button 13 1KV test voltage preset button Note Battery compartment located on bottom of instrument and test lead compartment located behind the upper faceplate Shop for Extech products at 1 80...

Page 6: ...en test jack on the meter Optional Leakage guard Connect the optional Blue Leakage guard test lead to the Blue test jack NOTE The Blue Leakage guard lead is attached directly to the top of the Blue guard lead of the Red test lead Connecting the Test Leads to the device under test Warning make sure that the circuit under test is de energized o Connect the Green Earth lead to the Earth or ground sid...

Page 7: ...uard cable to the blue socket on the meter Connect the service end of the Red cable to other side of the insulator under test If a Leakage Guard lead is required to collect surface leakage connect the separate Blue test lead into the Blue guard lead from the Red test lead which is plugged into the Blue test socket on the meter and then clip the service end of the cable to the surface of the insula...

Page 8: ...eter and then to the Ground side of the insulator under test Connect the Red lead to the Red test socket on the meter and the Blue guard cable to the blue socket on the meter Connect the service end of the Red cable to other side of the insulator under test If a Leakage Guard lead is required to collect surface leakage connect the separate Blue test lead into the Blue guard lead from the Red test ...

Page 9: ...ther an insulating material under test will break down in a given amount of time Manual Test STOP To stop a test in progress press the TEST button The test will immediately end and the system will automatically discharge Automatic Test STOP When in the default EnersaveTM mode the test automatically stops in 5 seconds When not in the EnersaveTM mode the test automatically stops after approx 10 minu...

Page 10: ...ain switch If the main switch is opened and the motor has a motor starter then the starter must be held in the ON position With the main switch opened the measured resistance will include the resistance of the motor wire and all of the other components between the motor and the main switch If a weakness is indicated the motor and other components should be checked individually If the motor is disc...

Page 11: ...d to the grounded motor housing This also applies to DC Generators Testing Single Conductor Cables 1 Completely disconnect the cable under test from its source and destination 2 Connect the test leads to the cable as shown at right Testing Multi Conductor Cables 1 Completely disconnect the cable under test from its source and destination 2 Refer to the diagrams below for three possible tests Core ...

Page 12: ...igh voltage winding to ground 5 Low voltage winding to ground Notes on Measuring the Resistance of a Contactor or Circuit breaker A Contactor or Circuit breaker must provide a low resistance path to electricity when closed but should provide a high resistance when open As they age their characteristics may deteriorate because of heavy use operation in a dirty environment or other factors Unusual I...

Page 13: ...he total resistance is high Should the total resistance not be high enough the contaminants should be removed or the insulator replaced Test the dirty insulator for proper resistance by testing with the optional guard lead Note If cleaning the insulator is possible follow the procedure of the manufacturer DIRTY INSULATOR ELECTRICAL EQUIVALENT CIRCUIT DIRTY INSULATOR TYPICAL TEST Notes Resistance a...

Page 14: ...tore where the batteries were purchased or wherever batteries are sold Disposal Do not dispose of this instrument in household waste The user is obligated to take end of life devices to a designated collection point for the disposal of electrical and electronic equipment Other Battery Safety Reminders o Never dispose of batteries in a fire Batteries may explode or leak o Never mix battery types Al...

Page 15: ... stop or upon completion of test External Voltage Alert Warning of external voltage presence 500VAC or VDC Low battery indicator Replace battery displayed when battery voltage is low Power source Eight 1 5V C Alkaline cells Battery life 40 hours no load at 10kV Auto Power off After 10 minutes of inactivity EnersaveTM mode Shorter test time 10 seconds to conserves battery energy Test Leads silicone...

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