VTI Instruments Metek EX1202 User Manual page 128

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If a PTP master clock does not exist on the network, an LXI device on the network will begin
serving as the PTP time master. The Time Configuration page allows for PTP time to be set
manually. From the Time Configuration page, select the Set Time checkbox, then select the
Grandmaster radio button from the Target field, and then configure the time by hand. Note that
the Time field should be completed using a 24-hour format.
To use the EX1200 as the PTP clock that will serve time on the LXI network, select the Self radio
button in the Target field. The EX1200 then becomes the PTP master clock. While this ensures
measurement synchronicity between the units that to this clock, the overall timestamp accuracy is
not as accurate because of the time's hand-set nature. For higher overall timestamp accuracy, use a
PTP master clock that is synchronized to a global time source like, such as GPS.
Using SNTP/NTP Time
By selecting SNTP from the Time Source menu, the EX1200 can be synchronized with an SNTP
server. The Time Zone drop menu allows the user to select the local time zone. SNTP, or NTP
(Network Time Protocol), servers are specified in the NTP Servers field, by IP address or
hostname, as shown in Figure 7-17. Once configured, the user must click Submit in order for the
changes to take effect.
To configure the EX1200 to use NTP time as its clock source:
1) Select SNTP from the Time Source field. The page will change so that it can be configured.
2) Add/Remove NTP servers use the appropriate buttons until the EX1200 is configured to
communicate to the desired server(s).
3) Click the Save button to save the server configuration.
4) Click Submit to begin using NTP time.
NOTES 1) If the Submit button is clicked before saving an NTP configuration, the EX1200 will start
using NTP time, but will use the last previously saved server configuration.
2) Specifying SNTP or NTP servers by hostname requires that the instrument has DNS, either by
DHCP or Static IP.
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EX1200 Triggering