COMPMID-622 Let the user choose the units for the instruments

Change-Id: Ic6ac4cd6df6970593a5e2e6310b6d61951c88898
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/93887
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/tests/framework/instruments/Measurement.h b/tests/framework/instruments/Measurement.h
index 08624f3..8a1ec9c 100644
--- a/tests/framework/instruments/Measurement.h
+++ b/tests/framework/instruments/Measurement.h
@@ -57,7 +57,7 @@
         {
             if(value.is_floating_point)
             {
-                os << arithmetic_to_string(value.v.floating_point);
+                os << arithmetic_to_string(value.v.floating_point, 4);
             }
             else
             {