Iwatsu SS-500 Series Instruction Manual page 100

Errors
Red lights up or goes out
A current exceeding 0.5 A rms has been detected.
 Remove the sensor form the conductor under
measurement.
Then, slide the opening lever of the sensor toward
the lower jaw until the
hidden to lock the upper jaw in place.
94
Green lights up
Red goes out
JAW UNLOCKED indicator is