QuadTech Guardian 6100 Plus Instruction Manual page 163

3.6 Troubleshooting
Listed herein are some common errors and suggested methods to resolve the problem.
High Limit Failures:
1. Check DUT ensure that it is not faulty
2. Remove DUT and perform test with cables only.
If the test passes, ensure offset LED is on (if this function is being used), if offset LED is
off, possible cause of failure is the additional leakage from offset being off. Perform
offset function and repeat testing.
If offset is either on or not being utilized, confirm the Guardian is measuring properly
using a standard resistor. Use ohms law to calculate what the current should be. For
instance if your test is 2200V, high limit set to 5mA. Attach a 500kohm resistor. The
display should read 4.4mA (give or take error in resistance)
Test fails with no cables attached:
Ensure low limit is off.
Ensure offset LED is on (if this function is being used).
Ensure high limit is programmed correctly.
Change ranges by adjusting the high limit.
If test passes on a different range, it is likely that one of the range relays has failed.
Low Limit Failures:
Ensure the DUT is connected
Ensure the Power Switch is enabled on DUT.
Check cabling by using resistor standard as described for verifying high limit.
Ground Bond Failures:
Short Ground Bond test leads together (or by method shown in Figure 2-15: Offset Short
using G30 & G15), with DUT removed. Ensure that Ground Bond test will pass with test
leads connected.
If not, try new set of test leads
Hipot Test fails during Ramp:
As stated, the high and low limits will not be applied during ramp. There are cases where
the test will fail during ramp. IF the leakage current exceeds the range limitation a
failure may occur during ramp.
For instance, the high limit is set to 2.5mA, if the leakage exceeds 3mA during ramp the
test will fail. The display may read UUUUU, this simply means the Guardian can not
measure the current, it is out of range.
Interface 150799 Rev A3 Page 163 of 177
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