YOKOGAWA Daqstation DX2000, User Manual

Page: 68 / 366

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IM 04L42B01-01E
1.10 Other Functions
Time Related Functions
• Time Correction
The DX internal clock can be changed in the following manner.
Method Description
Key operation Sets the DX internal clock to the specified time.
Event action function Synchronizes the DX internal clock to the nearest hour.
SNTP client function Sets the DX internal clock to the time retrieved from an SNTP
server.
Time Correction Operation
The time correction operation varies depending on whether the memory sampling is in
progress or not.
Status Operation
Memory sampling stopped The DX internal clock is changed immediately.
Memory sampling
The DX internal clock is gradually corrected. While the time is
being gradually adjusted, the date/time in the status display
section is displayed in yellow.
Operation of Gradually Correcting the Internal Clock
If the time deviation between the time of the DX internal clock and the correct time (the
specified time) is within a specified value, the DX clock is adjusted gradually at 40 ms
for each second. Otherwise, the clock is corrected immediately. The maximum value
of time deviation (tm in the figure below) can be selected in the range of 10 s to 5 min.
Time specified using keys or
retrieved from an SNTP server
Range in which the time is gradually
adjusted
Nearest
hour
Time deviation
Time when the remote control
signal is applied
(Time on the DX)
tm tm
Range in which the time is gradually
adjusted
Time on
the DX
Time deviation
tm tm
Example: When changing the time to 12 hours 55 minutes 35 seconds when the
internal clock is 12 hours 55 minutes 32 seconds
The time deviation of 3 seconds is adjusted 40 ms per second. The
internal clock will be synchronized to the specified time 75 seconds later.
• Date Format
You can select the display format of the data from “2005/09/28,” “09/28/2005,”
“28/09/2005,” and “28.09.2005.”
For the setting procedure, see section 2.4.
• Time Zone
Set the time difference between the location where the DX is used and GMT.
For the setting procedure, see section 2.2.
• DST (Daylight Saving Time)
If you are using the DX in an area with daylight saving time, enter the daylight
saving time starting and ending dates, and the DX will automatically change the time
accordingly.
For the setting procedure, see section 2.1.