PhaseStation 53100A User’s Manual V1.04 25-Apr-2022
61
The
Trace
→
Phase/frequency traces begin at zero (
z
)
and
Trace
→
Show linear
phase/frequency residual (
r
)
commands are both extremely useful. Enabling one or
both of these features can give you a detailed view of most phase- or frequency-
difference traces without altering the phase data itself
. Keep the
r
and
z
keys in mind
while working with these traces, and experiment with them frequently.
Hints for phase/frequency stability measurements
•
Due to slight variations in FPGA/USB interface temperature that occur when acquisition
begins, the 53100A’s own impact on critical residual-phase measurements can be minimized
if you use
Acquire
→
Enable deferred acquisition (
ctrl-d
)
to force the acquisition to throw
away incoming data until you press Enter to 'trigger' it. This feature is normally used to
improve synchronization in multiple acquisitions, but you can also use it to force a single
instrument to reach its equilibrium temperature before the software saves any data.
You can accomplish the same thing by selecting the
Measurement
→
Phase difference (
p
)
view, using the left mouse button to select the first few minutes of data where the phase
slope may be artificially degraded. When you release the button it will zoom to the selected
area of the plot. You can then hit
F4
to delete that chunk of data from the phase
record. The ADEV and other phase-derived graphs will be recalculated. (This will
not
affect
the phase or AM noise plots; as mentioned elsewhere, they are acquired with a completely
different "signal path" than the one that decimates and records the phase-difference data.)
•
Pressing
Scroll Lock
will latch the current Y-axis limits, preventing them from changing
regardless of the zoom status or
Trace
→
Phase/frequency Y axis unlocked in zoom mode (
y
)
option. This feature can be useful when you want to keep the view from being rescaled
after removing, detrending, or flattening trace data, such as when similar modifications are
being applied to multiple traces in an unzoomed view. Turning
Scroll Lock
off will restore
the previous Y-axis control state.
Most users will not need to latch the Y axis limits.
Scroll Lock
is one of the few operations in
TimeLab with no menu-based equivalent.
11
Note that the
Subtract quadratic linear frequency trend (drift curve) (
Ctrl-q
)
operation has no “view-
only” equivalent. It operates in a manner similar to the
Subtract global linear phase trend
(frequency offset) (
Ctrl-o
)
and
Subtract global linear frequency trend (drift line) (
Ctrl-l
)
commands, and can be
even better at revealing details in plots like this one.
Summary of Contents for PHASE STATION 53100A
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Page 215: ...PhaseStation 53100A User s Manual V1 04 25 Apr 2022 215 Appendix Legal and regulatory notices...