# 7. SanjANALYZER Plus — Calibration Image and ΔT Measurement

# 7. SanjANALYZER Plus — Calibration Image and ΔT Measurement

## 7.1 Open Calibration Image
1. Open the file where all test images are saved.
2. Open the Calibration Image file.
3. Click **"Correct XY"** to correct for thermal expansion.

## 7.2 Save Calibration Image
4. Click **"Save Images/Data."**
5. Change **Image Save Format** to **TTI**.
6. Click **"Save Image (Current VIEW)"** to capture an image.
7. If TTI is already selected, click **"Quick save"** instead.

## 7.3 Open Measurement (SS) Image
8. Click **"Open File."**
9. Select **"Refresh"** to update the file list with the corrected Calibration Image.
10. Open the Transient Image file (double-click).
11. Select **"Point by Point"** — the **"Load Cth Map"** window opens.
12. Select the corrected Calibration Image file from the file browser and click **"LOAD."**

> **Note:** Increasing the Alignment % value and decreasing the Vibration Filter improves alignment accuracy.

## 7.4 Measuring ΔT
13. Drag the ROI box across the length of the specimen with the rectangle tool to measure temperatures across that range. Up to 5 ROI boxes can be drawn to measure and compare temperatures at different locations on the specimen.
14. Select **"Thermal Cross-Section."**
15. Click **"Rectangular Profile"** to see the rectangular temperature profile within the ROI box.

In the source's example image, a **green** ROI box marks ΔT along the length of the specimen line, and a **yellow** ROI box marks the peak temperature. [diagram/image in source — not reproduced here]

**Alignment accuracy vs. ΔT accuracy** (this guidance appears twice in the source, under near-duplicate headings "2. Measuring ΔT" and "3. Measuring ΔT" — consolidated here):

- If an accurate ΔT is needed on smaller features, increase the Alignment % during calibration. This increases measurement time but yields more accurate, smoother results ("GOOD CAL" in the source's example figure).
- A lower-accuracy measurement shows red lines and unevenness in the image, caused by the device not being properly aligned and/or device movement ("BAD CAL" in the source's example figure). [diagram/image in source — not reproduced here]