Yokogawa Button Operated MV2000 - Manual (Page 59)

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IM MV1000-01E
1.11 Other Functons
Tme Related Functons
• Tme Correcton
The MV internal clock can be changed in the following ways.
Method Descrpton
Key operation Use to set the MV to a specified time.
Event action function Sets the MV internal clock to the closest hour.
SNTP client function
Sets the MV internal clock to the time retrieved from an SNTP server.
Tme Correcton Operaton
The time correction operation varies depending on whether or not memory sampling is
in progress.
For configuration instructions, see section 9.1.
Status Operaton
No memory sampling The MV internal clock is changed immediately.
Memory sampling
The MV internal clock is gradually corrected. While the time is being
gradually adjusted, the date/time in the status display section is
displayed in yellow.
Gradual Correcton of the Internal Clock
If the time deviation between the time of the MV internal clock and the correct time (the
specified time) is within a specified value, the MV clock is adjusted gradually at 40 ms
for each second. Otherwise, the clock is corrected immediately. The maximum value
of time deviation (referred to as tm in the figure below) can be selected from within the
range of 10 s to 5 min.
Time specified manually or retrieved
from an SNTP server
Range in which the time is
gradually adjusted
Nearest hour
Time deviation
Time when a remote control
signal is applied (Time on the MV)
tm tm
Range in which the time is
gradually adjusted
Time on the MV
Time deviation
tm tm
Example: When changing the time to 12 hours 55 minutes 35 seconds when the time
on the internal clock is 12 hours 55 minutes 32 seconds
The time deviation of 3 seconds is adjusted by 40 ms per second. The internal
clock will be fully synchronized to the specified time after 75 seconds.
• Date Format
You can select from the following ways of displaying the year, month, and day:
2008/01/23, 01/23/2008, 23/01/2008, and 23.01.2008.
For configuration instructions, see section 9.1.
• Tme Zone
You can set the time difference between the location where the MV is used and GMT.
For configuration instructions, see section 9.1.
• Daylght Savng Tme (DST)
If the MV is used in a region that has DST, the time is switched automatically between
DST and standard time at two user-specified times. For configuration instructions, see
section 9.1.