diff --git a/src/main/java/ScientaParametersPanel.java b/src/main/java/ScientaParametersPanel.java
index 49d1893..48253fa 100644
--- a/src/main/java/ScientaParametersPanel.java
+++ b/src/main/java/ScientaParametersPanel.java
@@ -34,6 +34,18 @@ public final class ScientaParametersPanel extends DevicePanel {
             model.addElement(energy);
         }
         comboPass.setModel(model);
+        valueTime.addListener((ValueSelection origin, double value, boolean editing) -> {
+            if (editing) {
+                try{
+                    int val_ms = (int) (((Double) value) * 1000);
+                    if ((val_ms % 40) != 0){
+                        throw new IOException("Value must be multiple of 40ms");
+                    }
+                } catch (Exception ex) {
+                    showException(ex);
+                }
+            }
+        });        
     }
 
     @Override