diff --git a/devlib/instrument/acmecape.py b/devlib/instrument/acmecape.py
index 103a9f8..e1bb6c1 100644
--- a/devlib/instrument/acmecape.py
+++ b/devlib/instrument/acmecape.py
@@ -120,4 +120,4 @@
                             # Convert rest into standard units.
                             output_row.append(float(row[i])/1000)
                     writer.writerow(output_row)
-        return MeasurementsCsv(outfile, self.active_channels)
+        return MeasurementsCsv(outfile, self.active_channels, self.sample_rate_hz)
diff --git a/devlib/instrument/daq.py b/devlib/instrument/daq.py
index 58d2f3e..75e854d 100644
--- a/devlib/instrument/daq.py
+++ b/devlib/instrument/daq.py
@@ -126,7 +126,7 @@
                     writer.writerow(row)
                     raw_row = _read_next_rows()
 
-            return MeasurementsCsv(outfile, self.active_channels)
+            return MeasurementsCsv(outfile, self.active_channels, self.sample_rate_hz)
         finally:
             for fh in file_handles:
                 fh.close()
diff --git a/devlib/instrument/energy_probe.py b/devlib/instrument/energy_probe.py
index ed502f5..5f47430 100644
--- a/devlib/instrument/energy_probe.py
+++ b/devlib/instrument/energy_probe.py
@@ -113,4 +113,4 @@
                             continue
                         else:
                             not_a_full_row_seen = True
-        return MeasurementsCsv(outfile, self.active_channels)
+        return MeasurementsCsv(outfile, self.active_channels, self.sample_rate_hz)
diff --git a/devlib/instrument/frames.py b/devlib/instrument/frames.py
index d43977f..d1899fb 100644
--- a/devlib/instrument/frames.py
+++ b/devlib/instrument/frames.py
@@ -44,7 +44,7 @@
         self.collector.process_frames(raw_outfile)
         active_sites = [chan.label for chan in self.active_channels]
         self.collector.write_frames(outfile, columns=active_sites)
-        return MeasurementsCsv(outfile, self.active_channels)
+        return MeasurementsCsv(outfile, self.active_channels, self.sample_rate_hz)
 
     def _init_channels(self):
         raise NotImplementedError()
diff --git a/devlib/instrument/gem5power.py b/devlib/instrument/gem5power.py
index 1e392a8..d265440 100644
--- a/devlib/instrument/gem5power.py
+++ b/devlib/instrument/gem5power.py
@@ -73,7 +73,7 @@
             for rec, rois in self.target.gem5stats.match_iter(sites_to_match,
                     [self.roi_label], self._base_stats_dump):
                 writer.writerow([float(rec[s]) for s in active_sites])
-        return MeasurementsCsv(outfile, self.active_channels)
+        return MeasurementsCsv(outfile, self.active_channels, self.sample_rate_hz)
 
     def reset(self, sites=None, kinds=None, channels=None):
         super(Gem5PowerInstrument, self).reset(sites, kinds, channels)
diff --git a/devlib/instrument/monsoon.py b/devlib/instrument/monsoon.py
index e373d68..3103618 100644
--- a/devlib/instrument/monsoon.py
+++ b/devlib/instrument/monsoon.py
@@ -129,4 +129,4 @@
                     row.append(usb)
                 writer.writerow(row)
 
-        return MeasurementsCsv(outfile, self.active_channels)
+        return MeasurementsCsv(outfile, self.active_channels, self.sample_rate_hz)