An electrocardiogram measuring device and a control method thereof are disclosed. By executing a digital processing with an ECG signal and a sample signal which is stored in the electrocardiogram measuring device, a correlation between the digital processed ECG signal and the digital processed sample signal is calculated. Then, by comparing with a plurality of correlation coefficient and two thresholds to determine whether the electrodes of the electrocardiogram measuring device are correctly attached on the specified position of the user.一種心電圖量測裝置及其控制方法,其透過對所偵測到的心電訊號與儲存於心電圖量測裝置中的樣本訊號進行數位處理後,再對經過數位處理後的心電訊號以及樣本訊號計算兩者之間的相關性,再依據所計算出的多個相關係數與兩個門檻值進行比較,據以判斷出心電圖量測裝置的電極是否有正確地貼附於受測者身上的指定位置。1‧‧‧心電圖量測裝置10‧‧‧偵測模組12‧‧‧前端處理模組14‧‧‧儲存模組16‧‧‧處理模組160‧‧‧數位處理單元162‧‧‧相關性計算單元164‧‧‧波形比對單元166‧‧‧校正單元18‧‧‧輸出模組
