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MG500-en-GB_v1.3   3/17

 

10 

Application-Specific Information 

Measuring Power Tools and Small Appliances 

For small appliances, connect the GREEN (EARTH) lead to conductors and the RED (LINE) lead to 

insulating material. 

 

For single or double insulated power tools, one lead should be connected to the device’s chuck, 

blade, etc. and the other lead to one of the AC power cord conductors (test both conductors in 

turn). Refer to the power tool application diagram below. 

 
 
 
 
 
 
 

 
 
AC Motor Test  

Disconnect the motor from the line by: 

a.

 

Disconnecting the wires from the motor 

terminals or, 

b.

 

Opening the main 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 disconnected at the motor terminals, connect the RED lead to the 

grounded motor housing and the GREEN lead to one of the motor leads. 

AC 
Plug 

For 2 or 3 prong plugs, connect the 
RED lead to one conductor at a time 

Connect the GREEN 
lead to the chuck 

Connect RED lead 
to grounded housing 

Connect GREEN lead 
to the motor leads 

Shop for Extech products at:

1.800.561.8187

ShopExtech

.ca

Содержание MG500

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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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