Transmille 2080 - Manual

Testing 16 th Edition Instruments
Using the 2080
Page 1 of 5
Application Note - 2080 User Guide.doc • V1.10
Testing the Insulation resistance function
The insulation measurement function of a tester measures high value resistance using a high voltage.
A high voltage is used to test that the insulation does not break down, and is an essential requirement
to this type of test.
To check the insulation measurement function of a tester it is nessarry to check both the applied test
voltage and also the accuracy of the resistance measurement.
Checking for the correct applied test voltage
1: To check the applied test voltage, connect the 2080,s ‘Common’ & ‘1Mohm’ terminals to the
insulation tester as shown below, and plug in 2080 to mains power.
2: Select the lowest test voltage range on the tester, 100V or 250V, and press test button on the
tester. Note the corresponding Voltage LED on the 2080 lights. Record result as pass on the check
sheet. Check the other test voltage ranges in the same way.
NOTE; For the LEDs to light the red terminal on the 2080 must be positive. On some
testers (eg. Robin) the Red lead is negative, and the leads must be reversed.
Checking the reading accuracy
1: Connected as above, select 500V test voltage range and record the reading on the tester.
Allow from 0.95 MOhms to 1.05 MOhms ± 1 digit *
2: Connect the tester to the 9.9M terminal on the 2080, Starting with the lowest voltage range,
record the displayed reading on each range.
Allow from 9.4 MOhms to 10.4 MOhms ± 1 digit *
3: Connect the tester to the 99M terminals on the 2080, select the 500V range and record the
reading.
Allow from 94 MOhms to 104 MOhms.*
Common Problems
Solution
Test voltage LED’s do not light 1: 2080 not plugged in
2: Tests leads reversed (see section 2 above)
3: Test leads open circuit. Try shorting together
to read zero
4: Tester Faulty or low batteries
Only the lower Test Voltage LED on Low batteries in tester
Tester reads over range all the time Test leads open circuit. Note some testers
require the correct test leads to be used.