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Switching from/to daylight saving time
activated: the device automatically switches to/from daylight saving time.
deactivated: the device uses standard time all year round!
NTP:
Server (1), (2): IP-address or name of server
max time discrepancy [ms]: States the permitted time discrepancy from the NTP-Server in ms, up to which the
device is still considered synchronized. When this discrepancy is surpassed, the message – "Not synchronized"
or "Synchronization in progress..".. is displayed.
For the sake of the measurement precision and comparability of measured data, we recommend increasing the
value of this entry if the discrepancy is big. Otherwise it will be necessary to dispense with synchronization
completely.
Interval[s] (min;max): Sets the minimum and maximum synchronization interval. The following circumstances
apply:
Short intervals produce higher precision but make higher demands on the network.
o
Long intervals may produce less precision, but also make less demands on the network.
o
Precision:
If the external conditions (mainly temperature, network demands) are subject to only slight fluctuation,
o
then even with long intervals, high precision can be expected. Shorter synchronization intervals should
be selected if, for example, frequent temperature fluctuations are expected.
NTP-Standard: min = 16 s, max = 1024 s. This value is also used of no entry is made. Adequate of
o
temperatures are constant, e.g. when the device is installed in a cabinet.
Example: NTP setting: min=8 s, max=64 s
Conditions:
o Devices exposed to daytime-based temperature fluctuations, rather than installed in a controlled climate
cabinet.
o Use of a company NTP-servers
Result: Among 3 devices, signal timing discrepancies of 0.01 .. 0.2 ms. This value is far below the uncertainty
level stipulated in the standard IEC 61000-4-30 and enables very good comparison of measurement signals.
Max. time to wait for synchronization [s]:
States for the case of a autostart the maximum time in seconds which the device waits (e.g. following a power
outage) for successful synchronization before starting measurement. For a standard measurement comprising
10 min of mean values, a time of 5 min makes sense. If valid time signals are applied, this enables successful
synchronization for all possible types.
0= wait until synchronization is complete
>0 time in seconds
-1 don't wait, start immediately
Note
Behavior of the device upon activation
Immediately upon activating SICAM Q80 7KG8080 the device begins the synchronization process. This is
advantageous with protocols which require extensive time to synchronize due to system properties, e.g NTP.
For this reason, the clock can be set as a default in the device configuration.
Confirm the new default using this button Time settings.... The button is only operable if the device is
connected.To apply it, it is necessary to restart the measurement device.
Synchronization signal input
In general, GPS receivers come with the ability to process the received UTC time
internally in order to provide the measurement device with the local time. The
manufacturer of the GPS receiver provides configuration software for this purpose.
A description of the hardware wiring and of the synchronization procedure is available in
the user's instructions in the chapter Conditioning and terminals under Synchronization of
multiple devices.
Operation modes and settings
Power Quality Recorder SICAM Q80 7KG8080, System manual
E50417-H1076-C420-A2, Release 12.01.2015
69
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