added capture time for every sweep

python_app/hardware_full/multi_device_service.py

@@ -332,10 +332,15 @@ class MultiDeviceLibreVnaService:
         assert self._sweep_configuration is not None
 
         self._controller.configure_continuous_sweep(self._sweep_configuration)
+        # Bound the sweep itself rather than reusing `capture_start_ns`: the latter
+        # is taken before any retry/recovery, so it would overstate how long the
+        # traces below took to measure.
+        sweep_start_ns = time.monotonic_ns()
         result = self._controller.collect_running_sweep_cycles(
             1,
             datapoint_timeout_seconds=LIBREVNA_NATIVE_SWEEP_TIMEOUT_SECONDS,
         )
+        sweep_end_ns = time.monotonic_ns()
         normalized_s_parameters = {
             str(name).lower(): np.asarray(values, dtype=np.complex64)
             for name, values in result.s_parameters.items()
@@ -356,6 +361,11 @@ class MultiDeviceLibreVnaService:
                         frequency_hz=frequencies,
                         s11=reflection,
                         s21=self._required_s_parameter(normalized_s_parameters, s_parameter_name),
+                        # Every combo comes out of the same synchronized cycle, so
+                        # they all share one window — no combo was measured earlier
+                        # or later than another here.
+                        capture_start_ns=sweep_start_ns,
+                        capture_end_ns=sweep_end_ns,
                     )
                 )
 
@@ -368,6 +378,7 @@ class MultiDeviceLibreVnaService:
 
     def _acquire_mock_collection(self, collection_id: int, capture_start_ns: int) -> SweepCollection:
         assert self._sweep_configuration is not None
+        mock_sweep_start_ns = time.monotonic_ns()
         points = int(self._sweep_configuration.points)
         frequencies = np.linspace(
             self._sweep_configuration.start_hz,
@@ -393,6 +404,8 @@ class MultiDeviceLibreVnaService:
                         frequency_hz=frequencies,
                         s11=s11,
                         s21=s21,
+                        capture_start_ns=mock_sweep_start_ns,
+                        capture_end_ns=time.monotonic_ns(),
                     )
                 )
         self._mock_phase += 0.05

python_app/hardware_full/sn9000_service.py

@@ -183,7 +183,11 @@ class Sn9000Service:
         capture_start_ns = time.monotonic_ns()
 
         s_parameters = self._query_sweep_s_parameters(points)
-        traces = self._assemble_traces(s_parameters)
+        traces = self._assemble_traces(
+            s_parameters,
+            sweep_start_ns=capture_start_ns,
+            sweep_end_ns=time.monotonic_ns(),
+        )
 
         return SweepCollection(
             collection_id=int(collection_id),
@@ -256,7 +260,13 @@ class Sn9000Service:
     def _uses_pyvisa_py_backend(self) -> bool:
         return self.visa_library == "@py" or self.visa_library.endswith("@py")
 
-    def _assemble_traces(self, s_parameters: dict[str, np.ndarray]) -> list[TraceData]:
+    def _assemble_traces(
+        self,
+        s_parameters: dict[str, np.ndarray],
+        *,
+        sweep_start_ns: int,
+        sweep_end_ns: int,
+    ) -> list[TraceData]:
         frequency_hz = self._require_frequency_axis()
         traces: list[TraceData] = []
         for output_position, output_port in enumerate(_OUTPUT_PORT_BY_INDEX):
@@ -269,6 +279,10 @@ class Sn9000Service:
                         frequency_hz=frequency_hz,
                         s11=reflection,
                         s21=transmission,
+                        # One triggered sweep produces every port pair at once, so
+                        # all combos share the sweep's window.
+                        capture_start_ns=int(sweep_start_ns),
+                        capture_end_ns=int(sweep_end_ns),
                     )
                 )
         return traces

python_app/hardware_full/switched_matrix_radar_service.py

@@ -140,7 +140,13 @@ class SwitchedMatrixRadarService:
         )
 
     def _acquire_step_traces(self, out_k: int, in_k: int, collection_id: int) -> list[TraceData]:
-        """Drive both switches to one step, settle, and collect its widened traces."""
+        """Drive both switches to one step, settle, and collect its widened traces.
+
+        Every returned trace carries the monotonic window of the inner collection
+        that produced it, so a consumer can tell when each combo of a switched
+        matrix was really measured instead of only when the whole cycle began and
+        ended. The switch drive and settling are deliberately outside the window.
+        """
         step_start_ns = time.monotonic_ns()
         if self.output_switch is not None:
             self.output_switch.switch_to(out_k)
@@ -178,6 +184,11 @@ class SwitchedMatrixRadarService:
                     input=in_k * self.inner_input_positions + int(trace.combo.input),
                     output=out_k * self.inner_output_positions + int(trace.combo.output),
                 ),
+                # Keep the inner service's own per-trace window when it reports one
+                # (it knows its internal port order better than this step does);
+                # otherwise fall back to the window of this inner collection.
+                capture_start_ns=int(trace.capture_start_ns) or settled_ns,
+                capture_end_ns=int(trace.capture_end_ns) or inner_end_ns,
             )
             for trace in sub.traces
         ]