ATO-
250™ Operating Procedures
18
APPENDIX A
ATO-250 Troubleshooting Guide
Ite
m
Symptom
Possible Problem
Solution
1
Reading is incorrect.
1. Poor connection at the
Clips.
2. Broken sensing lead.
1.Check connection to make sure
sensing and current teeth are
touching the device under test
(DUT).
2. Inspect sensing cables.
2
No Test Current.
(Current % reads zero)
and resistance reading
is also zero
1. No test current going
through the DUT.
2. Drive circuit is probably
not working.
1. Check the connection to the
DUT.
2. Run a Calibration Test.
3
Have test current but
resistance reading
reads zero.
1. Broken sense leads.
2. Reverse sense leads.
1. Inspect sense leads.
NOTE:
DUT
=Device Under Test
