Cewe Prometer 100, User Manual

Page: 35 / 72

BGX501-943-R01 Prometer 100 User Manual Page 35 of 72
7 Functions
This section provides an overview of the functions available in Prometer 100. All functions in the meter can be
both configured and read in M-Cubed. In many cases, M-Cubed can also export data to a file or print out data.
7.1 Meter clock
The Prometer 100 has an integrated real-time clock for time-dependent functions. Information about time
adjustment and daylight saving time status is recorded with tags on the logged values (refer to the section
Loggers on page 42). Time set is also noted as an event in the event log;
see the section Display of events (pg.
46).
7.1.1 Time Set
The meter’s date and time can be set to an absolute point in time. Instantaneous adjustment of the meter’s time
can influence logged values. For this reason, instantaneous adjustment of the meter clock is primarily intended
for use at initial configuration of the meter.
7.1.2 Time Advance and Time Retard (Sliding adjustment)
When the Prometer 100 is not being used for on-line application, the meter’s time can be advanced or retarded
using time advance or time retard commands with M-Cubed BCS. The meter time can be retarded or advanced
by t
tc
seconds spanned over N
tc
consecutive blocks of 15 minutes (t
tc
/ N
tc
seconds for each block). The meter
automatically adjusts for any time correction during the load survey reading period. Once a meter gets and
accepts a time advance/retard command, it is not possible to do time adjustment for the next 7 days.
7.1.3 Daylight saving time
Prometer 100 offers the alternative of letting the meter clock follow daylight savings time. At a specified date,
the meter clock is adjusted forward, and at another, adjusted backward. Prometer 100 can store 15 years of
DST configuration.
Example: On 28 March the clock is to be adjusted forward, from 02:00 to 03:00. The adjustment back to
standard time is to occur on 31 October at 3:00 (daylight savings time) when the clock is to be set back to
02:00. The following is set in the meters: Begin March, 28, 02:00. End October, 31, 03:00 and the standard time
is to be adjusted by 60 minutes.
7.1.4 External synchronisation
The meter time can be adjusted by a pulse on one of the meter’s digital inputs. When a pulse is registered, the
clock is adjusted to the closest multiple of a specified synchronisation interval. If the synchronisation interval is,
for example, one minute and the time is 13:00:29, a pulse will adjust the clock to 13:00:00. If the time had
instead been 13:00:31, the clock would have been adjusted to 13:01:00.
Available synchronisation intervals are:
1, 2, 5, 10, 15, 20, 30, 45 and 60 minutes
12 and 24 hours
A digital input must be configured for clock synchronisation (refer to the section Digital inputs and outputs on
page 39).
Note: Meter will not sync the time if the time difference is more than the time adjustment limit configured in the
meter. By default, the time adjustment limit is set as 25 seconds. The time adjustment limit can be configured as
any value between 0 to 30 seconds.