User Documentation

127
Devices – Energy Analyser D550
2008050000/03/02-2018
INFOBEREICH
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Calculation of the required memory capacity
With the default programming for recordings a data memory of approx. 11 MByte p.a. will be occupied.
Recording 1
• 23 values, 900 seconds
• (4+4+4) x 23 + 24 = 300 Bytes per dataset
• A dataset is written into the memory every 900 seconds.
• This means that the required annual memory capacity is =>96 datasets per day, => 35040 datasets p.a.,
=> 10.512 MByte p.a.
Recording 2
• 12 values, 3600 seconds
• 4 x 12 + 24 = 72 Bytes per dataset
• A dataset is written into the memory once an hour.
• This means that the required annual memory capacity is => 24 datasets per day, => 8760 datasets p.a.,
=> 630.72 kByte p.a.
4.3.5.12 Memory conguration
• The Energy Analyser D550 has a storage capacity of approx. 112 MByte.
• The data memory has been partitioned as follows ex works:
- 40%foruser-denedrecording.
- 22.5 % for the recording of transients.
- 22.5 % for the recording of full wave effective values.
- 10 % for the recording of events.
- 5%fortherecordingofags(agging).
4.3.5.13 Time
The Energy Analyser D550 has a clock with a battery backup. The fault in the clock’s quartz is aligned with
room temperature during production so that the clock only deviates by +-1 minute/month. If transient records
and event records are to be compared with other measurement records, it is recommended that the time in-
dicated by the Energy Analyser D550 be compared and aligned with that in a time server. For this purpose,
the Energy Analyser D550 requires the Ethernet interface (option). The network time protocol (NTP) is used
for synchronisation.
• Mode
Off - synchronisation of the clock with an external time server is switched off.
Lists - The Energy Analyser D550 is waiting for time information from a time server.
Active - The Energy Analyser D550 automatically requests time information from an NTP server every 64
seconds.
• NTP server - this is where the time server’s address is input.