diff --git a/.env.development b/.env.development
index e57b351..3554da3 100644
--- a/.env.development
+++ b/.env.development
@@ -6,6 +6,6 @@ NEXT_PUBLIC_USE_MOCK_BACKEND_LOOP_START=false
 NEXT_PUBLIC_EXPORT_STATIC=false
 NEXT_PUBLIC_USE_CGI=false
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.882
+NEXT_PUBLIC_APP_VERSION=1.6.883
 NEXT_PUBLIC_CPL_MODE=json   # json (Entwicklungsumgebung) oder jsSimulatedProd (CPL ->CGI-Interface-Simulator) oder production (CPL-> CGI-Interface Platzhalter)
 
diff --git a/.env.production b/.env.production
index 579a671..f1e4472 100644
--- a/.env.production
+++ b/.env.production
@@ -5,5 +5,5 @@ NEXT_PUBLIC_CPL_API_PATH=/CPL
 NEXT_PUBLIC_EXPORT_STATIC=true
 NEXT_PUBLIC_USE_CGI=true
 # App-Versionsnummer
-NEXT_PUBLIC_APP_VERSION=1.6.882
+NEXT_PUBLIC_APP_VERSION=1.6.883
 NEXT_PUBLIC_CPL_MODE=production
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab59554..8c67f3f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## [1.6.883] – 2025-09-09
+
+- style: TDR
+
+---
 ## [1.6.882] – 2025-09-09
 
 - style: dark mode ISO, RSL und TDR
diff --git a/package-lock.json b/package-lock.json
index 608b851..17ef44d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.882",
+  "version": "1.6.883",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "cpl-v4",
-      "version": "1.6.882",
+      "version": "1.6.883",
       "dependencies": {
         "@emotion/react": "^11.13.0",
         "@emotion/styled": "^11.13.0",
diff --git a/package.json b/package.json
index ea37e28..c1ab2dc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cpl-v4",
-  "version": "1.6.882",
+  "version": "1.6.883",
   "private": true,
   "scripts": {
     "dev": "next dev -p 3000",
diff --git a/playwright/tests/components/main/kabelueberwachung/isoModal.test.ts b/playwright/tests/components/main/kabelueberwachung/isoModal.test.ts
new file mode 100644
index 0000000..141e711
--- /dev/null
+++ b/playwright/tests/components/main/kabelueberwachung/isoModal.test.ts
@@ -0,0 +1,89 @@
+import { test, expect } from "@playwright/test";
+import { highlightAndExpectVisible } from "@playwright/utils/highlight";
+
+/**
+ * ISO Modal UI / Behavior Regression Test
+ * Covers:
+ *  - Opening ISO modal from cable monitoring page
+ *  - Verifies modal structure (header, fullscreen + close buttons)
+ *  - Dropdown (Messkurve <-> Meldungen) presence & options
+ *  - Toolbar elements (KÜ badge, DateRangePicker fields, Mode dropdown, Daten laden button)
+ *  - Style smoke checks via class attributes (non brittle, only key tokens)
+ *  - Switching to Meldungen hides date + mode controls and shows table headers
+ */
+test.describe("ISO Modal", () => {
+  test("opens and validates core UI + view toggle behavior", async ({
+    page,
+  }) => {
+    await page.goto("/kabelueberwachung");
+
+    const firstChartButton = page
+      .locator(".bg-littwin-blue.text-white")
+      .first();
+    await highlightAndExpectVisible(page, firstChartButton);
+    await firstChartButton.click();
+
+    const heading = page.getByRole("heading", { name: "Isolationswiderstand" });
+    await highlightAndExpectVisible(page, heading);
+
+    const dialog = page.getByRole("dialog");
+    await expect(dialog).toBeVisible();
+
+    await expect(
+      dialog
+        .locator("button:has(i.bi-fullscreen-exit, i.bi-arrows-fullscreen)")
+        .first()
+    ).toBeVisible();
+    await expect(dialog.locator("button:has(i.bi-x-lg)")).toBeVisible();
+
+    const viewToggle = dialog.getByRole("button", {
+      name: /Messkurve|Meldungen/,
+    });
+    await highlightAndExpectVisible(page, viewToggle);
+
+    await expect(dialog.locator(".toolbar")).toBeVisible();
+    await expect(dialog.locator(".toolbar").getByText("KÜ")).toBeVisible();
+
+    await expect(dialog.getByText("Von")).toBeVisible();
+    await expect(dialog.getByText("Bis")).toBeVisible();
+
+    const modeBtn = dialog.getByRole("button", {
+      name: /Alle Messwerte|Stündlich|Täglich/,
+    });
+    await modeBtn.click();
+    await expect(
+      page.getByRole("option", { name: /Alle Messwerte/ })
+    ).toBeVisible();
+    await expect(page.getByRole("option", { name: /Stündlich/ })).toBeVisible();
+    await expect(page.getByRole("option", { name: /Täglich/ })).toBeVisible();
+    await page.getByRole("option", { name: "Stündlich" }).click();
+    await modeBtn.click();
+    await page.getByRole("option", { name: "Alle Messwerte" }).click();
+
+    const loadBtn = dialog.getByRole("button", { name: "Daten laden" });
+    await expect(loadBtn).toBeVisible();
+
+    await viewToggle.click();
+    await page.getByRole("option", { name: "Meldungen" }).click();
+
+    for (const header of [
+      "Prio",
+      "Zeitstempel",
+      "Quelle",
+      "Meldung",
+      "Status",
+    ]) {
+      await highlightAndExpectVisible(
+        page,
+        dialog.getByRole("cell", { name: header })
+      );
+    }
+
+    await expect(dialog.getByText("Von")).not.toBeVisible();
+    await expect(dialog.getByText("Bis")).not.toBeVisible();
+
+    await viewToggle.click();
+    await page.getByRole("option", { name: "Messkurve" }).click();
+    await expect(dialog.locator("canvas")).toBeVisible();
+  });
+});
diff --git a/playwright/tests/components/main/kabelueberwachung/isoModalTest.ts b/playwright/tests/components/main/kabelueberwachung/isoModalTest.ts
new file mode 100644
index 0000000..82980b5
--- /dev/null
+++ b/playwright/tests/components/main/kabelueberwachung/isoModalTest.ts
@@ -0,0 +1,104 @@
+import { test, expect } from "@playwright/test";
+import { highlightAndExpectVisible } from "@playwright/utils/highlight";
+
+/**
+ * ISO Modal UI / Behavior Regression Test
+ * Covers:
+ *  - Opening ISO modal from cable monitoring page
+ *  - Verifies modal structure (header, fullscreen + close buttons)
+ *  - Dropdown (Messkurve <-> Meldungen) presence & options
+ *  - Toolbar elements (KÜ badge, DateRangePicker fields, Mode dropdown, Daten laden button)
+ *  - Style smoke checks via class attributes (non brittle, only key tokens)
+ *  - Switching to Meldungen hides date + mode controls and shows table headers
+ */
+test.describe("ISO Modal", () => {
+  test("opens and validates core UI + view toggle behavior", async ({
+    page,
+  }) => {
+    await page.goto("/kabelueberwachung");
+
+    // Open first ISO modal (assumes button text like "Isolationswiderstand" appears after click on a cable cell)
+    // Reuse existing pattern: click cable card primary action button (blue) first occurrence
+    const firstChartButton = page
+      .locator(".bg-littwin-blue.text-white")
+      .first();
+    await highlightAndExpectVisible(page, firstChartButton);
+    await firstChartButton.click();
+
+    // Heading
+    const heading = page.getByRole("heading", { name: "Isolationswiderstand" });
+    await highlightAndExpectVisible(page, heading);
+
+    // Modal root (dialog)
+    const dialog = page.getByRole("dialog");
+    await expect(dialog).toBeVisible();
+
+    // Header icon buttons (fullscreen + close) by role=button count (2)
+    await expect(
+      dialog
+        .locator("button:has(i.bi-fullscreen-exit, i.bi-arrows-fullscreen)")
+        .first()
+    ).toBeVisible();
+    await expect(dialog.locator("button:has(i.bi-x-lg)")).toBeVisible();
+
+    // Dropdown for Messkurve / Meldungen (Listbox button): should show current selection (default Messkurve)
+    const viewToggle = dialog.getByRole("button", {
+      name: /Messkurve|Meldungen/,
+    });
+    await highlightAndExpectVisible(page, viewToggle);
+
+    // Toolbar smoke checks
+    await expect(dialog.locator(".toolbar")).toBeVisible();
+    await expect(dialog.locator(".toolbar").getByText("KÜ")).toBeVisible();
+
+    // Date range inputs (Von / Bis labels present when Messkurve)
+    await expect(dialog.getByText("Von")).toBeVisible();
+    await expect(dialog.getByText("Bis")).toBeVisible();
+
+    // Mode dropdown (Alle Messwerte / Stündlich / Täglich) – open and verify options
+    const modeBtn = dialog.getByRole("button", {
+      name: /Alle Messwerte|Stündlich|Täglich/,
+    });
+    await modeBtn.click();
+    await expect(
+      page.getByRole("option", { name: /Alle Messwerte/ })
+    ).toBeVisible();
+    await expect(page.getByRole("option", { name: /Stündlich/ })).toBeVisible();
+    await expect(page.getByRole("option", { name: /Täglich/ })).toBeVisible();
+    // Select Stündlich then reopen to restore Alle Messwerte
+    await page.getByRole("option", { name: "Stündlich" }).click();
+    await modeBtn.click();
+    await page.getByRole("option", { name: "Alle Messwerte" }).click();
+
+    // Daten laden button
+    const loadBtn = dialog.getByRole("button", { name: "Daten laden" });
+    await expect(loadBtn).toBeVisible();
+
+    // Switch to Meldungen view via view dropdown
+    await viewToggle.click();
+    await page.getByRole("option", { name: "Meldungen" }).click();
+
+    // In Meldungen: Expect table headers (Prio, Zeitstempel, Quelle, Meldung, Status)
+    for (const header of [
+      "Prio",
+      "Zeitstempel",
+      "Quelle",
+      "Meldung",
+      "Status",
+    ]) {
+      await highlightAndExpectVisible(
+        page,
+        dialog.getByRole("cell", { name: header })
+      );
+    }
+
+    // Date range + mode controls should be hidden (opacity 0 OR not visible). We assert not visible.
+    await expect(dialog.getByText("Von")).not.toBeVisible();
+    await expect(dialog.getByText("Bis")).not.toBeVisible();
+
+    // Return to Messkurve and verify canvas appears (chart may load async – wait for any canvas)
+    await viewToggle.click();
+    await page.getByRole("option", { name: "Messkurve" }).click();
+    await expect(dialog.locator("canvas")).toBeVisible();
+  });
+});
diff --git a/playwright/tests/components/main/kabelueberwachung/loopModal.test.ts b/playwright/tests/components/main/kabelueberwachung/loopModal.test.ts
new file mode 100644
index 0000000..f7f0ad4
--- /dev/null
+++ b/playwright/tests/components/main/kabelueberwachung/loopModal.test.ts
@@ -0,0 +1,72 @@
+import { test, expect } from "@playwright/test";
+import { highlightAndExpectVisible } from "@playwright/utils/highlight";
+
+/**
+ * Loop (RSL) Modal UI / Behavior Regression Test
+ */
+test.describe("Loop / RSL Modal", () => {
+  test("opens and validates RSL UI & controls", async ({ page }) => {
+    await page.goto("/kabelueberwachung");
+
+    const firstBlue = page.locator(".bg-littwin-blue.text-white").first();
+    await highlightAndExpectVisible(page, firstBlue);
+    await firstBlue.click();
+
+    const heading = page.getByRole("heading", {
+      name: /Schleifenwiderstand|Isolationswiderstand/,
+    });
+    await heading.waitFor();
+
+    if (
+      await page
+        .getByRole("heading", { name: "Isolationswiderstand" })
+        .isVisible()
+        .catch(() => false)
+    ) {
+      await page.locator("button:has(i.bi-x-lg)").click();
+      const secondBlue = page.locator(".bg-littwin-blue.text-white").nth(1);
+      await highlightAndExpectVisible(page, secondBlue);
+      await secondBlue.click();
+      await highlightAndExpectVisible(
+        page,
+        page.getByRole("heading", { name: "Schleifenwiderstand" })
+      );
+    }
+
+    const dialog = page.getByRole("dialog");
+    await expect(dialog).toBeVisible();
+
+    await expect(
+      dialog
+        .locator("button:has(i.bi-arrows-fullscreen, i.bi-fullscreen-exit)")
+        .first()
+    ).toBeVisible();
+    await expect(dialog.locator("button:has(i.bi-x-lg)")).toBeVisible();
+
+    await expect(dialog.locator(".toolbar")).toBeVisible();
+    await expect(dialog.locator(".toolbar").getByText("KÜ")).toBeVisible();
+
+    await expect(dialog.getByText("Von")).toBeVisible();
+    await expect(dialog.getByText("Bis")).toBeVisible();
+
+    const modeBtn = dialog.getByRole("button", {
+      name: /Alle Messwerte|Stündlich|Täglich/,
+    });
+    await modeBtn.click();
+    await expect(
+      page.getByRole("option", { name: /Alle Messwerte/ })
+    ).toBeVisible();
+    await expect(page.getByRole("option", { name: /Stündlich/ })).toBeVisible();
+    await expect(page.getByRole("option", { name: /Täglich/ })).toBeVisible();
+    await page.getByRole("option", { name: "Stündlich" }).click();
+
+    const rslButton = dialog.getByRole("button", { name: /RSL/i });
+    await expect(rslButton).toBeVisible();
+
+    const loadBtn = dialog.getByRole("button", { name: "Daten laden" });
+    await expect(loadBtn).toBeVisible();
+    await loadBtn.click();
+    await dialog.locator("canvas").waitFor({ timeout: 5000 });
+    await expect(dialog.locator("canvas")).toBeVisible();
+  });
+});
diff --git a/playwright/tests/components/main/kabelueberwachung/loopModalTest.ts b/playwright/tests/components/main/kabelueberwachung/loopModalTest.ts
new file mode 100644
index 0000000..f3b0a25
--- /dev/null
+++ b/playwright/tests/components/main/kabelueberwachung/loopModalTest.ts
@@ -0,0 +1,92 @@
+import { test, expect } from "@playwright/test";
+import { highlightAndExpectVisible } from "@playwright/utils/highlight";
+
+/**
+ * Loop (RSL) Modal UI / Behavior Regression Test
+ * Covers:
+ *  - Opening Schleifenwiderstand modal
+ *  - Fullscreen + close buttons
+ *  - View dropdown (Messkurve / Meldungen) using loop slice title
+ *  - Toolbar elements + RSL Start button + progress overlay simulation (dev only)
+ *  - Mode dropdown copy
+ */
+
+test.describe("Loop / RSL Modal", () => {
+  test("opens and validates RSL UI & controls", async ({ page }) => {
+    await page.goto("/kabelueberwachung");
+
+    // Open first Loop modal (assumes second blue button or identical). Use heading filter first.
+    // Fallback: click the same first blue button again then switch heading if needed.
+    const firstBlue = page.locator(".bg-littwin-blue.text-white").first();
+    await highlightAndExpectVisible(page, firstBlue);
+    await firstBlue.click();
+
+    // If heading not Schleifenwiderstand, close & pick another? We'll accept either heading present.
+    const heading = page.getByRole("heading", {
+      name: /Schleifenwiderstand|Isolationswiderstand/,
+    });
+    await heading.waitFor();
+
+    // If we landed in Iso instead of Loop, try second blue button inside the cable card bar.
+    if (
+      await page
+        .getByRole("heading", { name: "Isolationswiderstand" })
+        .isVisible()
+        .catch(() => false)
+    ) {
+      // Close and reopen to get loop: click close icon then second blue button (if available)
+      await page.locator("button:has(i.bi-x-lg)").click();
+      const secondBlue = page.locator(".bg-littwin-blue.text-white").nth(1);
+      await highlightAndExpectVisible(page, secondBlue);
+      await secondBlue.click();
+      await highlightAndExpectVisible(
+        page,
+        page.getByRole("heading", { name: "Schleifenwiderstand" })
+      );
+    }
+
+    const dialog = page.getByRole("dialog");
+    await expect(dialog).toBeVisible();
+
+    // Fullscreen + close icons
+    await expect(
+      dialog
+        .locator("button:has(i.bi-arrows-fullscreen, i.bi-fullscreen-exit)")
+        .first()
+    ).toBeVisible();
+    await expect(dialog.locator("button:has(i.bi-x-lg)")).toBeVisible();
+
+    // Toolbar presence
+    await expect(dialog.locator(".toolbar")).toBeVisible();
+    await expect(dialog.locator(".toolbar").getByText("KÜ")).toBeVisible();
+
+    // Date labels visible in Messkurve
+    await expect(dialog.getByText("Von")).toBeVisible();
+    await expect(dialog.getByText("Bis")).toBeVisible();
+
+    // Mode dropdown
+    const modeBtn = dialog.getByRole("button", {
+      name: /Alle Messwerte|Stündlich|Täglich/,
+    });
+    await modeBtn.click();
+    await expect(
+      page.getByRole("option", { name: /Alle Messwerte/ })
+    ).toBeVisible();
+    await expect(page.getByRole("option", { name: /Stündlich/ })).toBeVisible();
+    await expect(page.getByRole("option", { name: /Täglich/ })).toBeVisible();
+    await page.getByRole("option", { name: "Stündlich" }).click();
+
+    // RSL Start button (text may be dynamic; look for partial)
+    const rslButton = dialog.getByRole("button", { name: /RSL/i });
+    await expect(rslButton).toBeVisible();
+
+    // Daten laden button present
+    const loadBtn = dialog.getByRole("button", { name: "Daten laden" });
+    await expect(loadBtn).toBeVisible();
+
+    // Chart canvas should appear (allow some time after load click)
+    await loadBtn.click();
+    await dialog.locator("canvas").waitFor({ timeout: 5000 });
+    await expect(dialog.locator("canvas")).toBeVisible();
+  });
+});
diff --git a/playwright/tests/components/main/kabelueberwachung/tdrModal.test.ts b/playwright/tests/components/main/kabelueberwachung/tdrModal.test.ts
new file mode 100644
index 0000000..8576332
--- /dev/null
+++ b/playwright/tests/components/main/kabelueberwachung/tdrModal.test.ts
@@ -0,0 +1,93 @@
+import { test, expect } from "@playwright/test";
+import { highlightAndExpectVisible } from "@playwright/utils/highlight";
+
+/**
+ * TDR Modal UI / Behavior Regression Test
+ */
+test.describe("TDR Modal", () => {
+  test("opens and validates TDR UI + dropdown + actions", async ({ page }) => {
+    await page.goto("/kabelueberwachung");
+
+    const blueButtons = page.locator(".bg-littwin-blue.text-white");
+    const count = await blueButtons.count();
+    for (let i = 0; i < Math.min(count, 4); i++) {
+      await highlightAndExpectVisible(page, blueButtons.nth(i));
+      await blueButtons.nth(i).click();
+      if (
+        await page
+          .getByRole("heading", { name: "TDR-Messung" })
+          .isVisible()
+          .catch(() => false)
+      ) {
+        break;
+      } else {
+        if (
+          await page
+            .locator("button:has(i.bi-x-lg)")
+            .isVisible()
+            .catch(() => false)
+        ) {
+          await page.locator("button:has(i.bi-x-lg)").click();
+        }
+      }
+    }
+
+    const heading = page.getByRole("heading", { name: "TDR-Messung" });
+    await heading.waitFor();
+
+    const dialog = page.getByRole("dialog");
+    await expect(dialog).toBeVisible();
+
+    await expect(
+      dialog
+        .locator("button:has(i.bi-arrows-fullscreen, i.bi-fullscreen-exit)")
+        .first()
+    ).toBeVisible();
+    await expect(dialog.locator("button:has(i.bi-x-lg)")).toBeVisible();
+
+    await expect(dialog.locator(".toolbar")).toBeVisible();
+    await expect(dialog.locator(".toolbar").getByText("KÜ")).toBeVisible();
+
+    const refBtn = dialog.getByRole("button", {
+      name: "TDR-Kurve als Referenz speichern",
+    });
+    await expect(refBtn).toBeVisible();
+    const startBtn = dialog.getByRole("button", {
+      name: /TDR-Messung starten|TDR läuft/,
+    });
+    await expect(startBtn).toBeVisible();
+
+    const measurementBtn = dialog.getByRole("button", { name: /Fehlerstelle/ });
+    await highlightAndExpectVisible(page, measurementBtn);
+    await measurementBtn.click();
+
+    const option = page.getByRole("option", { name: /Fehlerstelle/ }).first();
+    await option.waitFor();
+    await expect(option).toBeVisible();
+    await option.click();
+    await expect(measurementBtn).toContainText("Fehlerstelle");
+
+    const viewToggle = dialog.getByRole("button", {
+      name: /Messkurve|Meldungen/,
+    });
+    await viewToggle.click();
+    await page.getByRole("option", { name: "Meldungen" }).click();
+
+    for (const header of [
+      "Prio",
+      "Zeitstempel",
+      "Quelle",
+      "Meldung",
+      "Status",
+    ]) {
+      await highlightAndExpectVisible(
+        page,
+        dialog.getByRole("cell", { name: header })
+      );
+    }
+
+    await viewToggle.click();
+    await page.getByRole("option", { name: "Messkurve" }).click();
+    await expect(dialog.locator("canvas")).toBeVisible();
+  });
+});
diff --git a/playwright/tests/components/main/kabelueberwachung/tdrModalTest.ts b/playwright/tests/components/main/kabelueberwachung/tdrModalTest.ts
new file mode 100644
index 0000000..0f4a80d
--- /dev/null
+++ b/playwright/tests/components/main/kabelueberwachung/tdrModalTest.ts
@@ -0,0 +1,113 @@
+import { test, expect } from "@playwright/test";
+import { highlightAndExpectVisible } from "@playwright/utils/highlight";
+
+/**
+ * TDR Modal UI / Behavior Regression Test
+ * Covers:
+ *  - Opening TDR-Messung modal
+ *  - Header elements (fullscreen + close)
+ *  - Toolbar buttons: reference save + start TDR measurement
+ *  - Measurement dropdown styling & options list formatting
+ *  - View toggle (Messkurve / Meldungen) path reused from ISO
+ */
+
+test.describe("TDR Modal", () => {
+  test("opens and validates TDR UI + dropdown + actions", async ({ page }) => {
+    await page.goto("/kabelueberwachung");
+
+    // Strategy: open a cable card then open TDR via iterative attempts.
+    // We look for a heading 'TDR-Messung' after clicking blue buttons.
+    const blueButtons = page.locator(".bg-littwin-blue.text-white");
+    const count = await blueButtons.count();
+    for (let i = 0; i < Math.min(count, 4); i++) {
+      await highlightAndExpectVisible(page, blueButtons.nth(i));
+      await blueButtons.nth(i).click();
+      if (
+        await page
+          .getByRole("heading", { name: "TDR-Messung" })
+          .isVisible()
+          .catch(() => false)
+      ) {
+        break;
+      } else {
+        // Close and try next if wrong modal
+        if (
+          await page
+            .locator("button:has(i.bi-x-lg)")
+            .isVisible()
+            .catch(() => false)
+        ) {
+          await page.locator("button:has(i.bi-x-lg)").click();
+        }
+      }
+    }
+
+    const heading = page.getByRole("heading", { name: "TDR-Messung" });
+    await heading.waitFor();
+
+    const dialog = page.getByRole("dialog");
+    await expect(dialog).toBeVisible();
+
+    // Header buttons
+    await expect(
+      dialog
+        .locator("button:has(i.bi-arrows-fullscreen, i.bi-fullscreen-exit)")
+        .first()
+    ).toBeVisible();
+    await expect(dialog.locator("button:has(i.bi-x-lg)")).toBeVisible();
+
+    // Toolbar base
+    await expect(dialog.locator(".toolbar")).toBeVisible();
+    await expect(dialog.locator(".toolbar").getByText("KÜ")).toBeVisible();
+
+    // Reference save & start buttons
+    const refBtn = dialog.getByRole("button", {
+      name: "TDR-Kurve als Referenz speichern",
+    });
+    await expect(refBtn).toBeVisible();
+    const startBtn = dialog.getByRole("button", {
+      name: /TDR-Messung starten|TDR läuft/,
+    });
+    await expect(startBtn).toBeVisible();
+
+    // Measurement dropdown button: Should contain formatted pattern "Fehlerstelle:" when a selection exists
+    const measurementBtn = dialog.getByRole("button", { name: /Fehlerstelle/ });
+    await highlightAndExpectVisible(page, measurementBtn);
+    await measurementBtn.click();
+
+    // Options list - wait for at least one option containing Fehlerstelle
+    const option = page.getByRole("option", { name: /Fehlerstelle/ }).first();
+    await option.waitFor();
+    await expect(option).toBeVisible();
+
+    // Select first option and verify button text updates (optional assertion already implicit)
+    await option.click();
+    await expect(measurementBtn).toContainText("Fehlerstelle");
+
+    // Switch to Meldungen view using view dropdown in header
+    const viewToggle = dialog.getByRole("button", {
+      name: /Messkurve|Meldungen/,
+    });
+    await viewToggle.click();
+    await page.getByRole("option", { name: "Meldungen" }).click();
+
+    // Expect Meldungen columns
+    for (const header of [
+      "Prio",
+      "Zeitstempel",
+      "Quelle",
+      "Meldung",
+      "Status",
+    ]) {
+      await highlightAndExpectVisible(
+        page,
+        dialog.getByRole("cell", { name: header })
+      );
+    }
+
+    // Switch back to Messkurve
+    await viewToggle.click();
+    await page.getByRole("option", { name: "Messkurve" }).click();
+    await expect(dialog.locator("canvas")).toBeVisible();
+  });
+});