18
Power Quality Analyzer PowerPad
®
IV Model 8345
3.3.2.1 GPS Mode
The GPS mode is necessary to guarantee that your instrument is Class A (per
IEC 61000-4-30). The instrument must have access to the GPS satellites at
least once to receive the date and time. The instrument could take up to 15
minutes to synchronize.
The instrument will maintain accuracy in the following situations, even if the
satellites are no longer accessible.
Satellites in view
Maximum drift (Class A)
Drift (Model 8345)
None
±1 s / 24 h
±24 ms / 24 h
One or more
±16.7 ms vs UTC
at all times
±60 ns / 1 s
corrected at all times
To avoid time discontinuities, you cannot set the time automatically when a
recording is in progress.
The satellite reception status is indicated by an icon ( ) in the status bar.
GPS
synchronization
Not synchronized
Synchronized
Satellites in view
None
One or more
None
One or more
No recording
Recording in progress
After 40 days with no exposure to a GPS satellite, the synchronization icon ( )
will change to unsynchronized ( ).
3.3.2.2 NTP Mode
Status of time
synchronization via GPS
Time synchronization
by NTP:
Not synchronized
Synchronized
Synchronized and
recording in progress
