added capture time for every sweep

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