MANUAL P/N 900000118 REV D
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5.4.3.1
Adjusting the Time Zone Offset
To adjust the Time zone offset, enter the number of hours EAST of UTC as a positive
value, and the number of hours WEST of UTC as a negative value.
5.4.3.2
Adjusting 1PPS Output settings
The PTU’s 1PPS output is adjustable in both width and phase.
The PTU incorporates a unique feature that allows the 1PPS outputs to be offset
from the main internal time base (which is synchronized to the reference). This
feature may be used to compensate for propagation delay in the cables between the
PTU and the point of use.
A negative delay will ADVANCE the 1PPS relative to the reference.
A positive delay will RETARD the 1PPS relative to the reference.
Each individual 1PPS output can be delayed over a full second range (± 0.5 seconds)
in 1ns steps, independent of the settings of the other outputs.
The Pulse width may be varied over the range of 10ns to 650µs in increments of 5ns.
Enter the desired pulse width (in nanoseconds) in the box labeled Output 1PPS
Width and click Submit. The pulse width setting applies to all 1PPS outputs.
Select the checkbox labeled “Output 1PPS Invert” to invert the 1PPS Output. Under
normal settings, the 1PPS output provides 0V of current and increases to 5V for each
pulse. Inverting it changes the1PPS output to 5V and drops to 0V for the duration of
the pulse.
Figure 15 - 1PPS Signal, showing normal and inverted.
“On-time edge”