Auto Test BST-380, User Manual, Page: 6 / 28

The tester has a reverse connection protection function. When clamps are accidentaly
connected in reverse, the tester will prompt “Reverse Connection” and it will damage
neither the testing unit nor the automotive load.
NOTE: For parallel connected batteries, break off the cathode connection first, then do a
single test to each battery. If the cathode connection is not cut off there will be errors
in test result.
3.1.2 Key Description
• Up and Down keys
Select upwards or downwards via white UP and DOWN keys.
• Return key
Return to previous menu via blue RETURN key.
• OK key
Confirm the selection via green OK key.
• MENU key
Enter additional function programs via MENU key.
• Power key
Turn on/off the tester. (Refer to 3.2 Tester Startup).
3.1.3 Connect Current Clamp
To test cranking amps and charging current, first connect the current clamp before
startup, then turn on the current clamp power switch.
After the tester starts up the current clamp is able to work.
Press the reset key of the current clamp and connect the current clamp jaw to the
anode wiring between the battery to be tested and the generator. See next picture.
As the minimum width of the current clamp jaw is only 28mm, choose the connection
cable or connection pole with a diameter less than 28mm to test. Otherwise, the current
clamp jaw cannot close completely.
REVERSE
CONNECTION