Transmille 2080 - Manual (Page 4)

Testing 16 th Edition Instruments
Using the 2080
Page 4 of 5
Application Note - 2080 User Guide.doc • V1.10
The timing measurement should also be tested with both a long and a short trip time to be sure
that it is reading correctly.
It is of less importance but if the tester has a ‘positive/negative’ cycle switch it would be good practice
to test this as well.
The unique features of the electronic trip built into 2080 allow all the above to be tested quickly and
easily. Accurate timing is ensured as the time period is not dependant on the current drawn, and an
LED warns of over current. Even the positive/negative switch can be checked, as the time period will
be 10mS longer for starting on the negative cycle.
Simply checking that a tester can trip an RCD is almost no check of the correct operation of the tester
at all, there is no indication of over current and the timing accuracy is poor and varies with current.
Checking an RCD Tester
1: Plug the 2080 into an Unprotected supply (no RCD trip) and plug the RCD tester into the Right-
hand socket ‘RCD’ on the 2080 as shown below.
2: Select the 10mA range and the 0° setting if fitted on the tester, and the 10mA/150ms range on the
2080. Press the reset button on the 2080, wait for the tester to be ready then press test on the tester.
The 2080’s ‘tripped’ led will light and the ‘Over current LED should be off. Record the time displayed
on the tester.
Allow from 135ms to 166ms.*
3: Repeat above for the testers 30mA range.
4: If the tester has a ‘x5I’ button select this and the 30mA range. Set the 2080 to 150mA/30ms and
press ‘test’ button. Record the displayed time.
Allow from 25ms to 35ms.*
5: If the Tester has a 0°/180° switch select the 180° position and 30mA range, Set the 2080 to
30mA/150ms. The timing period displayed should be 10mS more than with the 180° selected as read
in test 3 above.
Common Problems Solution
No power to RCD tester 1: 2080 not plugged in
2: Fuse blown in 2080
Time period 10ms too long Tester set to 180° (negative cycle)
Mains Power Switches Off 2080 not connected to unprotected supply