Blanking; Temperature; Time And Date - Siemens OCM III Instruction Manual

BLANKING

Blanking is used to ignore the zone in front of the transducer where ringing or other
false echo is at a level that interferes with the processing of the true echo. The
minimum blanking is factory set, but can be overridden by entering the desired
distance into P47.
Ringing is the inherent nature of the transducer mass to continue vibrating after the
transducer has been fired. Ringing decays to acceptable levels in the order of
milliseconds. Excessive cold or over tightening of the transducer mounting may
increase the ring time such that it appears as an echo during the receive cycle. This is
usually indicated by an incorrect high head reading. Excessive ring time may be
overcome by increasing the blanking.

TEMPERATURE

The temperature as currently registered by the temperature sensor is viewed under
D5. Data on the running minimum and maximum temperatures that have occurred
since the last reset can be viewed in several ways:
F7 gives the running min/max temperatures and their time and date of occurrence
since the last reset. F7 is reset by F8 but only after satisfying the security
parameter F0.
D6/D7 give the respective running min/max temperature data, only, that have
occurred since they were last reset. D6 is reset by entering a value lower than D5,
and D7 is reset by entering a value larger than D5. D6 and D7 will then adopt the
current temperature value and track the min/max values from that point on. The
security parameter F0 does not need to be satisfied in order to reset D6 or D7.
Temperature data specific to the time and date can be viewed under the data log F14
(see \ Logging).
D14 indicates the resistance of the temperature sensor corresponding to the
temperature shown in D5.

TIME AND DATE

If the data logging features of the OCM-3 are to be used, the time (F4) and date (F5)
must be set. The day starts at 00:00:00 and ends at 23:59:59.
Adjusting the Time
If the clock time is advanced beyond the next anticipated logging time, the entry for
each missed logging time is filled with a code which indicates that the system was not
able to make entries at those times.
The daily total will be reduced proportional to the amount of time the day
was shortened.
If the clock time is set back beyond the preceding logging time, the previously logged
date will be written over with new data as the logging proceeds.
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