Casella CEL CEL-393 - Manual (Page 24)

Function 9F is described in Chapter 9, whilst 8F duplicates the single
operation of the C key. The sequence 7F is only valid when the instru-
ment is in the event mode.
Clock
This key is used for all time functions. Operation of the key alone results
in the display of time functions in sequence, whilst preceeding it with a
number will enter new time information. The procedure for reading the
time information is therefore a sequence of operations of the C key alone
as follows.
1st operation of C key displays the main clock (real or elapsed
time),
2nd operation of C key displays selected period time,
3rd operation of C key displays time left in current period,
4th operation of C key displays selected delayed start time.
Subsequent operation of the C key will return to the main clock, and allow
the sequence to be run through again.
The default time settings at switch on are.
0 hours 00 minutes for the main clock, to allow a display of
elapsed time from switch on,
9999 minute period time, giving event mode of data storage
with no defined state for the elapsed time display but with the
delay time flag set off to allow the microprocessor access to
the memory for its computed results.
In order to set any of the time functions to other values the following
procedure should be followed.
/20. 393 Handbook