User manual

Series 3700 System Switch/Multimeter Reference Manual Section 11: LXI Class B Triggering (IEEE-1588)
3700S-901-01 Rev. C / July 2008 11-3
You can avoid confusion by setting the time on the Series 3700 to UTC time
instead of local time. Manage the conversion from UTC to local time in your
software application. For example, assume local time is Eastern Standard Time
in the United States (EST), which is equivalent to GMT-5 (hours). Therefore, if
the current local time is 3:00PM, the UTC time is 8:00PM. Set the time of the
Series 3700 clock to 8:00PM. If it is then synchronized with a time-zone aware
master clock, its time will not change significantly.
NOTE The Series 3700 does not differentiate UTC and PTP time.
ptp.utcoffset (on page 13-229) is zero unless a master clock that
is aware of the difference between UTC and PTP time populates this
value. This value is volatile and not remembered through a power
cycle.
Configuring and enabling IEEE-1588
To configure IEEE-1588, connect the Series 3700 to the LAN, along with any
other IEEE-1588 enabled devices that you want to synchronize to the Series
3700. Refer to Series 3700 Quick Start Guide for information on connecting the
Series 3700 to the LAN. If you want to synchronize multiple Series 3700
instruments on a LAN, each instrument must have the same PTP subdomain
name.
The default PTP subdomain name is _DFLT for all Series 3700 devices. Use the
ptp.subdomain function to change the subdomain name for any Series 3700
on the LAN. After changing the subdomain name, you must power cycle the
Series 3700 to restart its clocks. If you have changed the subdomain name of
any third-party IEEE-1588 enabled device within that subdomain, you must also
restart its clock.
NOTE Cycling the power to the Series 3700 does not return the IEEE-1588-
related parameters to factory default state. To return these to factory
defaults, perform a LAN configuration reset. This can be done using
lan.status.reset() (on page 13-202) on the remote command
interface. You can also perform a reset through the front panel
interface by entering the Main menu, selecting LAN, and selecting
Reset.