Skip logging during auto-range transitions to avoid settling artifacts

When voltage or current range changes, waits 3 measurement cycles
before resuming CSV/graph logging. Settling readings are printed to
console but not recorded, preventing transient values from corrupting
test data.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hioki3193/cli.py

@@ -62,6 +62,21 @@ def cmd_measure(meter: Hioki3193, args: argparse.Namespace) -> None:
         print(f"  {name:>8s} = {value:+.6E}")
 
 
+SETTLE_CYCLES = 3  # Number of cycles to skip after a range change
+
+
+def _read_ranges(
+    meter: Hioki3193,
+    voltage_channels: list[int],
+    current_channels: list[int],
+) -> list[str]:
+    """Read current voltage and current ranges for the given channels."""
+    return (
+        [meter.get_voltage_range(ch) for ch in voltage_channels]
+        + [meter.get_current_range(ch) for ch in current_channels]
+    )
+
+
 def cmd_monitor(meter: Hioki3193, args: argparse.Namespace) -> None:
     """Continuously monitor measurements at an interval."""
     items = args.items if args.items else ["U5", "I5", "P5", "U6", "I6", "P6", "EFF1"]
@@ -86,19 +101,37 @@ def cmd_monitor(meter: Hioki3193, args: argparse.Namespace) -> None:
     print(f"{'Time':>10s}  {header}")
     print("-" * (12 + 14 * len(items)))
 
+    # Range settle tracking
+    prev_ranges = _read_ranges(meter, voltage_channels, current_channels)
+    settle_remaining = 0
+
     try:
         count = 0
         while args.count == 0 or count < args.count:
             result = meter.measure(*items)
+            ranges = _read_ranges(meter, voltage_channels, current_channels)
+
+            # Detect range change
+            if ranges != prev_ranges:
+                settle_remaining = SETTLE_CYCLES
+                range_desc = ", ".join(
+                    f"{a}->{b}" for a, b in zip(prev_ranges, ranges) if a != b
+                )
+                print(f"  ** Range changed ({range_desc}), settling {SETTLE_CYCLES} cycles...")
+                prev_ranges = ranges
+
             ts = time.strftime("%H:%M:%S")
             vals = "  ".join(f"{v:>+12.4E}" for v in result.values.values())
+
+            if settle_remaining > 0:
+                print(f"{ts:>10s}  {vals}  [settling {settle_remaining}]")
+                settle_remaining -= 1
+                time.sleep(interval)
+                continue
+
             print(f"{ts:>10s}  {vals}")
 
             if writer:
-                ranges = (
-                    [meter.get_voltage_range(ch) for ch in voltage_channels]
-                    + [meter.get_current_range(ch) for ch in current_channels]
-                )
                 writer.writerow(
                     [time.strftime("%Y-%m-%d %H:%M:%S")]
                     + [f"{v:.6E}" for v in result.values.values()]
@@ -287,6 +320,9 @@ def cmd_live(meter: Hioki3193, args: argparse.Namespace) -> None:
     # Error threshold - values above this are instrument error codes
     ERROR_THRESHOLD = 1e90
 
+    # Range settle tracking (lists for mutability in closure)
+    settle_state = {"prev": _read_ranges(meter, voltage_channels, current_channels), "remaining": 0}
+
     def update(_frame):
         try:
             result = meter.measure(*items)
@@ -294,20 +330,31 @@ def cmd_live(meter: Hioki3193, args: argparse.Namespace) -> None:
             print(f"Read error: {e}")
             return list(lines.values())
 
-        now = time.time() - t0
-        timestamps.append(now)
+        ranges = _read_ranges(meter, voltage_channels, current_channels)
 
-        # Print to console
+        # Detect range change
+        if ranges != settle_state["prev"]:
+            settle_state["remaining"] = SETTLE_CYCLES
+            range_desc = ", ".join(
+                f"{a}->{b}" for a, b in zip(settle_state["prev"], ranges) if a != b
+            )
+            print(f"  ** Range changed ({range_desc}), settling {SETTLE_CYCLES} cycles...")
+            settle_state["prev"] = ranges
+
+        now = time.time() - t0
         ts = time.strftime("%H:%M:%S")
         vals = "  ".join(f"{v:>+12.4E}" for v in result.values.values())
+
+        if settle_state["remaining"] > 0:
+            print(f"{ts}  {vals}  [settling {settle_state['remaining']}]")
+            settle_state["remaining"] -= 1
+            return list(lines.values())
+
+        timestamps.append(now)
         print(f"{ts}  {vals}")
 
         # CSV logging
         if writer:
-            ranges = (
-                [meter.get_voltage_range(ch) for ch in voltage_channels]
-                + [meter.get_current_range(ch) for ch in current_channels]
-            )
             writer.writerow(
                 [time.strftime("%Y-%m-%d %H:%M:%S")]
                 + [f"{v:.6E}" for v in result.values.values()]