13.8 GPS Time Synchronization Function
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Chapter 13 Specifications
The GPS BOX PW9005 can be connected to the instrument to synchronize the instrument’s time
with the GPS satellite time (coordinated universal time).
13.8 GPS Time Synchronization Function
GPS settings and status display function
GPS box connection setting RS connected device: GPS
GPS reception status display Positioning status : Err (no positioning data), 2D (2D independent positioning), 3D (3D in-
dependent positioning), D2D (differential 2D positioning), D3D (differ-
ential 3D positioning)
No. of positioning satellites : 0 to 12 (no. of satellites that can be used in position calculation)
DOP value : 0 to 9,999 (GPS positioning status reliability) (smaller values other
than 0 indicate higher reliability)
GPS mark A GPS mark is displayed among other icons along the top of the screen to indicate the GPS posi-
tioning status.
Blue GPS mark : Time correction has been performed.
Yellow GPS mark : The device is unable to acquire GPS satellites or unable to calculate its posi-
tion. The yellow mark is also shown when time correction is canceled during
recording.
Red GPS mark : The PW3198 has not detected the GPS box.
Time correction function
Corrected time and correction
accuracy
Set to amount of variation from universal coordinated time (UTC).
The instrument’s clock is corrected within ±2 ms of the GPS time accuracy.
Initial position 1. The GPS mark is yellow after connecting the GPS BOX PW9005 to the instrument.
2. The GPS mark turns blue after the unit has acquired GPS satellites and positioning status and
finished correcting the instrument time.
Time correction processing • Time correction is performed once every 1 s (during recording, once every 30 s).
• If the time variation is 16 ms or less during recording, time correction is performed every second
with ms-order precision. If the time variation is greater than 16 ms, a GPS Err event occurs, and
time correction is not performed.
• When synchronizing the time among multiple PW3198 instruments, 200 ms aggregation start
times may vary for up to 10 minutes from the start of recording.
GPS event function When recording is started in the time-corrected state (while the GPS mark is blue), a GPS event
is generated when any of the following occur during recording:
• GPS error (GPS error): GPS IN
• GPS error cleared (GPS positioning): GPS OUT
• GPS time correction failure (GPS time error): GPS Err
13.9 Other Functions
Warning functions
Out of range When the input exceeds the range by 130%, displays ---.---.
Phase/line voltage setting is irrelevant.
Out of crest factor When the waveform peak exceeds 2 the voltage range or 4 the current range, "crest factor exceed-
ed" is displayed. The phase/line voltage setting is irrelevant.
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