Beha Amprobe GT-800 PRO KITVDE-tester 4472081 Manuel D’Utilisation

GT-600/GT-800 Instruction Manual 

21 

 

 

 

Insulation Resistance Test 250 V / 500 V (R

ISO

) 

 

The insulation resistance test measures the resistance of the insulation between: 
  L/N terminals of test socket and PE terminal of test socket in parallel with 

PROBE 2 (at class I and class II). L/N terminals are shorted by the tester for this 
test. 

  Test probe PROBE 1 and test probe PROBE 2 (at class III). 

 

 

Warnings

 

  The test voltage is either 500 V (or 250 Vd.c. at GT-800 only). Do not 

touch the appliance during the insulation test! If the test fails, any metal 
part of the appliance could become live! 

  Always make sure that the test has completed before disconnecting the 

appliance leads to ensure that all capacitances have discharged! 

 

 

Cautions

 

  Do not perform the Insulation test on appliances that failed the 

protective bonding test or the visual inspection test. 

  The insulation test may not be suitable for some types of appliances. For 

these appliances an alternative test may be conducted such as touch 
current, protective conductor current or substitute leakage current test. 
It is essential to refer to the local appliance test standards and/or 
reference material for the safe applicability of these alternative tests. 

  Test voltage of 500 V may not be suitable for some appliances that 

contain overvoltage protection devices (e.g. varistors) in its installation. 
For these appliances test voltage of 250 V shall be used, refer to the 
local appliance test standards and/or follow the manufacturer 
recommendations. 
 

Remarks: 
  Connect the appliance and the test lead according to the figure 9, 10 or 11. 
  For class I appliances no probe is required except if there are some metal 

parts on the appliance which are not connected to PE terminal. 

  For class II appliances apply the test probe to any exposed metalwork on the 

appliance. Do the test for all exposed metal parts on the appliance, partial 
results must pass pre-set limit value. 
 

 

 
Figure 9: Insulation resistance test connections at appliance class I