Operation
2021 Microchip Technology Inc.
DS50003057A-page 19
FIGURE 3-4:
Synchronize 1 PPS to External Source.
The CsIII synchronizes its 1PPS outputs to within ±100 ns of the applied external 1PPS
source if a rising edge is detected within three seconds after pressing the Sync button.
Select Cancel to exit the panel without re-synchronizing the 1 PPS output.
3.5
SLEWING THE OUTPUT PHASE
To provide finer resolution adjustment of the output phase that is available from the
1 PPS Synchronization feature, the output phase can be slewed, with 1 ns resolution,
using the Delta-T function. This function is implemented by deliberately offsetting the
output frequency of the CsIII by either ȳ = 1 x 10
–9
or ȳ = –1 x 10
–9
or N seconds,
thereby introducing a phase offset of plus or minus N ns, respectively. Note that, unlike
the 1PPS synchronization feature, the Delta-T function affects the phase on all outputs,
including RF and 1PPS.
Note that the output frequency of the instrument is significantly perturbed, by ȳ = ± 1 x
10
–9
, for the duration of the adjustment. For example, phase advance of 1 ms, intro
-
duces a ȳ = 1 x 10
–9
error in all clock outputs, persisting for 1,000,000 seconds, almost
12 days. To avoid introducing an offset for such a long duration, it is recommended to
use the Sync 1PPS feature to bring the phase to within 100 ns of the desired value.
FIGURE 3-5:
Slew Output Phase.
In order to adjust the output phase, select Delta-T… from the Outputs menu. The Slew
Output Phase panel appears. Enter the desired output phase, in the range of 0- ns and
select either Advance or Retard from the pull down menu. Press Begin Slew to begin
the phase slewing operation. The output frequency of the CsIII is immediately offset by
either ȳ = 1 x 10
–9
or ȳ = –1 x 10
–9
, depending on whether Advance or Retard is
selected, respectively. To abort the phase slewing operation in process, and return the
instrument to its nominal frequency, return to the Slew Output Phase panel and press
the Abort button at any time during the operation.
Summary of Contents for 4310B
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