{
  "title": "Continuity at four simulated test sites",
  "source": "ngspice LM358 bench simulation",
  "inputSha256": "55658386b44747eb8ac5365878110f0ba710a5e6fe207a5ebf04bebd88d26705",
  "testNumber": 10,
  "units": "V",
  "limits": {
    "low": 0.4000000059604645,
    "high": 0.8999999761581421
  },
  "diagnosis": {
    "fault": "contactor-wear",
    "site": 2,
    "onsetPart": 62,
    "confidence": "high",
    "verdict": "fault"
  },
  "report": {
    "sha256": "26ae1badfbb566941beabca83964dfea8b3d095365166ca15320efe9c62b7691",
    "turns": 8,
    "seconds": 42.8,
    "costUsd": 0.094,
    "models": [
      "claude-haiku-4-5-20251001",
      "claude-sonnet-5"
    ],
    "codeVersion": "2122bb4",
    "startedAt": "2026-09-01T12:56:51-0400"
  },
  "chain": [
    {
      "tool": "file_overview",
      "claim": "Lot yields 100% with all 3 tests showing 0 fails, so this is not a hard-fail issue.",
      "observation": "devices=200, failed_devices=0, yield_pct=100.0, hard_bins {1:200}"
    },
    {
      "tool": "test_summary",
      "claim": "Test 10 CONTINUITY_INP is the only survey candidate, flagged by both site skew and a scan-level drift.",
      "observation": "test 10: max_site_z=7.08, trend_z=4.72 (others: test 100 max_site_z=2.16/trend_z=2.26; test 200 max_site_z=0.831/trend_z=2.15 \u2014 both below thresholds)"
    },
    {
      "tool": "site_comparison",
      "claim": "The site-8 deviation is statistically real and concentrated on Site 2 alone.",
      "observation": "site 2: mean=0.697, z_vs_others=7.08 (flag SITE-SKEW site 2 z=7.08); sites 1,3,4: z=-4.95,-5.26,-4.69 (mutually consistent baseline, only site 2 is the outlier)"
    },
    {
      "tool": "trend_analysis (by_site=true)",
      "claim": "Site 2's deviation is a progressive ramp starting near part 62, not a static offset; other sites are flat.",
      "observation": "site 2: preferred_model=ramp, slope_z=23.9, onset_part_id=62, total_drift_sigma=3.229, flags [DRIFT slope_z=23.9, STEP onset_part=166 z=13.7]; sites 1/3/4: preferred_model=flat, slope_z between -1.42 and -1.26"
    },
    {
      "tool": "distribution_analysis (test 10, site 2)",
      "claim": "Site 2's distribution is still inside limits but margin is eroding and spread has widened relative to other sites.",
      "observation": "std=0.05946 (vs ~0.011 on other sites per site_comparison), margin_sigma_hi=3.414, p99=0.8088 approaching hi_limit=0.9, possibly_bimodal=true"
    },
    {
      "tool": "part_details (part_id=62)",
      "claim": "At the ramp's own onset part (62), the continuity reading is still near-mean and the other two tests on that same device are normal, confirming the effect is test/site-local rather than a device-level or lot-wide event.",
      "observation": "part 62, site 2: test10 value=0.6317 (sigma_from_mean=-0.50, status P); test100 sigma=1.365 P; test200 sigma=0.600 P \u2014 no anomaly elsewhere on this device"
    }
  ],
  "recommendedAction": "Inspect and clean/replace the contactor/socket pins on Site 2's continuity (INP) channel before the next lot; re-baseline site 2 against sites 1/3/4 post-service. Monitor test 10 margin_sigma_hi on site 2 \u2014 at current drift rate it is the first test likely to start failing.",
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