diff --git a/nxtomomill/converter/hdf5/acquisition/baseacquisition.py b/nxtomomill/converter/hdf5/acquisition/baseacquisition.py
index 9efd0540c98e539bc4de6490b31939968444708a..6db0177574759476918e27c27858df89e6cabc7a 100644
--- a/nxtomomill/converter/hdf5/acquisition/baseacquisition.py
+++ b/nxtomomill/converter/hdf5/acquisition/baseacquisition.py
@@ -468,8 +468,8 @@ class BaseAcquisition:
 
     def _get_electric_current(self, root_node) -> list:
         """retrieve electric current provide a time stamp for each of them"""
-        if self._root_url is None:
-            _logger.warning("no root url. Unable to read rotation motor")
+        if root_node is None:
+            _logger.warning("no root url. Unable to read electric current")
             return None, None
         else:
             grps = [
diff --git a/nxtomomill/converter/hdf5/acquisition/standardacquisition.py b/nxtomomill/converter/hdf5/acquisition/standardacquisition.py
index bc01ccbe668992b513920c15727da4dc39287ae8..0dd64ed687837f4f0f04fa75a524a8092570f1b3 100644
--- a/nxtomomill/converter/hdf5/acquisition/standardacquisition.py
+++ b/nxtomomill/converter/hdf5/acquisition/standardacquisition.py
@@ -509,7 +509,6 @@ class StandardAcquisition(BaseAcquisition):
             end_time = self._get_end_time(entry)
             if end_time is not None:
                 end_time = datetime.fromisoformat(end_time)
-
             if has_frames:
                 self._register_frame_timestamp(entry, start_time, end_time)
 
@@ -697,9 +696,8 @@ class StandardAcquisition(BaseAcquisition):
         :param H5group entry: user can provide directly an entry to be used as an open h5Group
         """
         url = self.parent_root_url() or self.root_url
-        if url is None:
-            return None
-        self._check_has_metadata(url)
+        if url is not None:
+            self._check_has_metadata(url)
 
         def process(h5_group):
             if h5_group is not None and path in h5_group:
@@ -708,6 +706,8 @@ class StandardAcquisition(BaseAcquisition):
                 getattr(_logger, level)(message)
 
         if entry is None:
+            if url is None:
+                return None
             with EntryReader(url) as h5_group:
                 return process(h5_group)
         else:
diff --git a/nxtomomill/converter/hdf5/acquisition/utils.py b/nxtomomill/converter/hdf5/acquisition/utils.py
index 055a15d3b184b670af0e49da53368bf1124ac174..a9607f41a2fec2c4fc5bb1e10704cde0317dece4 100644
--- a/nxtomomill/converter/hdf5/acquisition/utils.py
+++ b/nxtomomill/converter/hdf5/acquisition/utils.py
@@ -196,14 +196,24 @@ def deduce_machine_electric_current(
             )
 
     res = []
+
+    ts1 = ts2 = None
     for timestamp in timestamps:
         if not isinstance(timestamp, numpy.datetime64):
             raise TypeError(
                 f"elements of timestamps are expected to be instances of {numpy.datetime64} and not {type(timestamp)}"
             )
-        (ts1, w1), (ts2, w2) = get_closest_timestamps(timestamp)
+        # if we can ts1 research
+        if ts1 is not None and ts2 is not None and ts1 < timestamp < ts2:
+            delta = ts2 - ts1
+            w1 = 1 - (timestamp - ts1) / delta
+            w2 = 1 - (ts2 - timestamp) / delta
+        else:
+            (ts1, w1), (ts2, w2) = get_closest_timestamps(timestamp)
         ec1 = knowned_machine_electric_current.get(ts1)
         assert ec1 is not None
         ec2 = knowned_machine_electric_current.get(ts2, 0.0)
-        res.append(ec1 * w1 + ec2 * w2)
+        current_at_timestamp = ec1 * w1 + ec2 * w2
+        res.append(current_at_timestamp)
+
     return tuple(res)