diff --git a/CDB/LOFAR_ConfigDb.json b/CDB/LOFAR_ConfigDb.json
index f4032fb611d54f261676041658af859a69f37559..705f701556224fa4936e35916993aa2d4d05107e 100644
--- a/CDB/LOFAR_ConfigDb.json
+++ b/CDB/LOFAR_ConfigDb.json
@@ -479,6 +479,8 @@
                                 "1000",
                                 "rnd20",
                                 "1000",
+                                "rnd21",
+                                "1000",
                                 "state",
                                 "1000",
                                 "status",
diff --git a/devices/test/devices/random_data.py b/devices/test/devices/random_data.py
index 02c11e532d7a2ad69e4ffce1e51188e42c6cf3f7..43e1a037624a516f88d05d644fd86e23fab6baa8 100644
--- a/devices/test/devices/random_data.py
+++ b/devices/test/devices/random_data.py
@@ -25,8 +25,14 @@ class Random_Data(Device):
     """
     Random data monitor point device
     """
+
+    dim_array = 1024 # x-axis dimension of a random values array
+
     def read(self):
         return random.random()
+    
+    def read_array(self):
+        return random.rand(self.dim_array).astype(double)
 
     # Attributes
     rnd1 = attribute(
@@ -388,6 +394,26 @@ class Random_Data(Device):
         min_warning = 0.98,
         fget = read,
     )
+
+    rnd21 = attribute(
+        dtype = ('DevDouble',),
+        max_dim_x =  dim_array,
+        max_dim_y = 1,
+        polling_period = 1000,
+        period = 1000,
+        rel_change = 0.1,
+        abs_change = 0.1,
+        archive_period = 1000,
+        archive_rel_change = 0.1,
+        archive_abs_change = 0.1,
+        max_value = 1.0,
+        min_value = 0.0,
+        max_alarm = 1.0,
+        min_alarm = 0.99,
+        max_warning = 0.99,
+        min_warning = 0.98,
+        fget = read_array,
+    )
     
     # General methods
     def init_device(self):
@@ -457,6 +483,9 @@ class Random_Data(Device):
         self.rnd20.set_data_ready_event(True)
         self.set_change_event("rnd20", True, True)
         self.set_archive_event("rnd20", True, True)
+        self.rnd21.set_data_ready_event(True)
+        self.set_change_event("rnd21", True, True)
+        self.set_archive_event("rnd21", True, True)
         self.set_state(DevState.ON)
 
     def delete_device(self):