Why do I get inconsistent readings using a non-trip loop tester?

All modern loop testers use a low current to prevent tripping the RCD. This achieved in various ways but usually at 15mA. Mains noise can have an effect on readings with such a small current. You may experience variable results or a longer time in obtaining a reading. The only way to guarantee an accurate result each time is to use a higher test current.
To see the 9083P high current method click here.

 

What is the difference between a certificate of conformity and a Calibration Certificate?

A Certificate of Conformity is usually issued at the time of manufacture. This is a statement to confirm that the unit has been calibrated in production, and leaves the factory working within the limits of its specification.

 

Do I need my meter calibrated with certificates from new?

Not necessarily. This depends on your company’s quality procedure or your governing body’s policy. We recommend that units are calibrated at regular intervals to emulate the recommendations of the manufacturer. This is usually on an annual basis but this time may need to be altered depending on use and environment.

 

Why does my meter display 50v when performing an RCD test?

This is known as touch voltage. It is requirement of the regulations that a measuring instrument cannot create a situation whereby 50v or greater could be passed into the earth system. The tester will check the mains supply in all configurations, it the result shows that the 50v rule could be breached further tests are inhibited. If this occurs check appliances are not connected to the supply under test as leakage currents from these could be causing the problem.

 

Why does my tester not trip an RCD on RCD test?

Check the settings on the unit are correct. Test current should match that of the RCD, also check that the unit is testing at the correct voltage type ie AC or DC.

The symbols on the display will tell you this AC DC



Why does my clamp meter display a reading when its not connected to a load?

This will usually be caused by noise. If the unit has a zero button, pressing this should take the display down to zero. You may still get a very small amount varying on the display.

 

Why does my 9083P tester show open circuit when connected to a circuit?

It is likely that you are using the wrong leads. With the 9083P Insulation & Continuity uses the red and black leads. The fact that you may be testing live to earth is irrelevant. You simply connect the red and black leads from the tester to your live and earth on the supply under test. Please be advised this is a dead test and mains voltage must not be present.

 

Why does my tester show voltage on a dead circuit after an Insulation test has been performed?

This can be due to the circuit under test having a level of capacitance. Some testers look for voltage across the terminals when the test button is not being pressed. There maybe a level of voltage in the supply after an insulation test has been performed. You should see this fall to zero after a few seconds. Always be sure that the circuit is dead and proved dead before carrying out this test. If you are ever unsure obtain a second opinion and test the supply for dead again having proved your own test instrument first.

 

How do I perform a high current Earth loop impedance measurement with the Di-Log 9083P?

See PDF for instructions. Download here.