diff --git a/script/Bpm6ParallelScan.py b/script/Bpm6ParallelScan.py
index 49d36d0..cd8431c 100644
--- a/script/Bpm6ParallelScan.py
+++ b/script/Bpm6ParallelScan.py
@@ -10,10 +10,12 @@ rel_x = pico_bpm6_ts_x.read()
 class SensorXAxis(ReadableArray):
     def __init__(self, sensor):
         self.sensor = sensor
+        self.x = rel_x[:]
     def read(self):
-        return [x + self.sensor.getTimestamp() for x in rel_x]
+        timestamp = self.sensor.getTimestamp()
+        return [x + timestamp for x in self.x]
     def getSize(self):
-        return len(rel_x)    #only reads if cache is None
+        return len(self.x)    #only reads if cache is None
 
 
 def scan(sensor):