ATO-
250™ Operating Procedures
ii
SAFETY SUMMARY
This device shall be used only by
trained operators
.
All devices under test shall be off line and fully isolated.
Do Not Service or Test Alone
Do not perform test procedures or service unless another person is also present who is capable of
rendering aid and resuscitation.
Do Not Modify Test Equipment
Do not install substitute parts or perform any unauthorized modification to any Model ATO-250
test unit, due to the added risk of introducing additional or unknown hazards. To ensure that all
designed safety features are maintained, it is recommended that repairs be performed only by
Vanguard Instruments Company factory personnel or by an authorized repair service.
Unauthorized modifications can cause serious safety hazards and will nullify the manufacturer's
warranty.
Follow Exact Operating Procedures
Any deviation from procedures described in this operator’s manual may create one or more
safety hazards, damage the ATO-250 or the device under test, or cause errors in the test results.
Vanguard Instruments Company, Incorporated assumes no liability for unsafe or improper use of
the ATO-250.
