diff --git a/measurement.py b/measurement.py
index ca7162a..054dbab 100644
--- a/measurement.py
+++ b/measurement.py
@@ -86,6 +86,7 @@
     def __init__(self, out_filename, port):
         super().__init__(out_filename)
         self._serial = serial.Serial(port, 115200, timeout=1)
+        self._serial.readline()
         self._cols = 4
         print("Seiral port connected on ", port)
 
@@ -123,7 +124,7 @@
 
     # Wait for stop
     print("measurement start.")
-    recode_dulation = 3  # sec
+    recode_dulation = 15  # sec
     for i in range(recode_dulation):
         time.sleep(1)
         print(i + 1, "/", recode_dulation, "sec")
@@ -139,23 +140,29 @@
     gd_t = np.linspace(
         gd_data[0, 0], gd_data[-1, 0], len(gd_data[:, 0])
     )  # Equalize time interval
-    valid = serial_worker._data[:, 0] >= gd_data[0, 0]
-    ser_data = serial_worker._data[valid, :]
+    # valid = serial_worker._data[:, 0] >= gd_data[0, 0]
+    # ser_data = serial_worker._data[valid, :]
+    ser_data = serial_worker._data
 
     # print(godirect_worker._data)
     # print(serial_worker._data)
 
-    func = interp1d(gd_t, gd_data[:, 1], kind="cubic")
+    func = interp1d(
+        gd_t, gd_data[:, 1], kind="linear", bounds_error=False, fill_value="extrapolate"
+    )
     new_gd_data = func(ser_data[:, 0])
     combind = np.hstack((ser_data, new_gd_data.reshape(new_gd_data.size, 1)))
+    combind = combind[-(recode_dulation * 100 + 1) :, :]
+    combind[:, 1] = (combind[:, 1] - combind[0, 1]) / 1000.0
 
     filename = datetime.datetime.now().strftime("Rec_%Y%m%d_%H%M%S.csv")
     np.savetxt(
         filename,
-        combind,
+        combind[:, 1:],
         delimiter=",",
         fmt="%.3f",
-        header="time(s),device time(ms),IF-I,IF-Q,RespBelt",
+        header="time(s),IF-I,IF-Q,RespBelt",
+        comments="",
     )
     print("Recoding data was saved to ", filename)
     # print(combind)