ADInstruments ML1001 Owner's Manual page 18

Name
AMAIN INTERVAL operation lamp
Lights when MAIN INTERVAL is operating.
(As it is sometimes difficult to tell whether MAIN INTERVAL is operating
when a long interval has been set, operation can be judged by checking the
lamp.)
MAIN
INTERVAL
signal
[Fig.9] MAIN INTERVAL operation when SET CYCLES is set to 008
Function
Disabled
Operating Stopped Operating
Description of Parts 9