Use Meters - IBM System/370 145 Operating Procedures Manual

USE METERS
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c=:=J
Customer
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Service
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Key Switch
Two direct reading use meters record operating time. One
meter records customer operating time and the other re-
cords service time. The position of the key switch deter-
mines which of the two meters is to record operating time.
Your service representative has the key for this switch.
Whenever he is performing scheduled or unscheduled
maintenance in the CPU, he sets the switch to cause the
service meter to run.
The meters record only CPU operating time. The
meters run for manual store and display operations
because these operations start the CPU clock. Either
meter runs for a minimum of approximately one second
each time the meter is started.
Console Indicators, Switches, and Keys 2.1