diff --git a/cpdctrl/measurement.py b/cpdctrl/measurement.py
index cbaa6bb..25f90aa 100644
--- a/cpdctrl/measurement.py
+++ b/cpdctrl/measurement.py
@@ -17,8 +17,6 @@ from multiprocessing import Pipe
 from multiprocessing.connection import Connection
 from queue import Queue
 
-
-
 def measure(
     vm_dev: VoltageMeasurementDevice, 
     led_dev: LedControlDevice, 
@@ -36,10 +34,11 @@ def measure(
         led_dev = LEDD1B()
     if vm_dev is None:
         vm_dev = init("GPIB0::22::INSTR")
-    # if no "time" in header, set the current local time in ISO 8601 format
+    # if no "time" in metadata, set the current local time in ISO 8601 format
     # and without microseconds
-    if not "time" in data.header:
-        data.header["time"] = datetime.datetime.now().replace(microsecond=0).isoformat()
+    if not "time" in data.metadata:
+        data.metadata["time"] = datetime.datetime.now().replace(microsecond=0).isoformat()
+    data.metadata["test"] = "TEST"
     vm_dev.reset(True)
     try:
         i = 0
@@ -91,4 +90,5 @@ def measure(
         pass
     data.flush(verbose=verbose)
     led_dev.off()
+    print(data.metadata)
     print("Measurement stopped" + " "*50)
\ No newline at end of file