diff --git a/pytec/pytec/gui/view/param_tree.json b/pytec/pytec/gui/view/param_tree.json
index 2afcb5a..c7c1412 100644
--- a/pytec/pytec/gui/view/param_tree.json
+++ b/pytec/pytec/gui/view/param_tree.json
@@ -156,7 +156,7 @@
                      "step": 0.1,
                      "limits": [
                         0,
-                        5
+                        4
                      ],
                      "siPrefix": true,
                      "suffix": "V",
@@ -401,7 +401,7 @@
                      "decimals": 6,
                      "step": 0.1,
                      "limits": [
-                        -2,
+                        0,
                         2
                      ],
                      "siPrefix": true,