diff --git a/cpdctrl/voltage_measurement_device/impl/test.py b/cpdctrl/voltage_measurement_device/impl/test.py
index 5797c1a..a7013d7 100644
--- a/cpdctrl/voltage_measurement_device/impl/test.py
+++ b/cpdctrl/voltage_measurement_device/impl/test.py
@@ -4,9 +4,9 @@ from time import time as now
 import numpy as np
 
 class TestVoltageMeasurementDevice(VoltageMeasurementDevice):
-    def __init__(self, ampltiude: float=1.0, frequency: float=3.0):
+    def __init__(self, amplitude: float=1.0, frequency: float=20.0):
         super().__init__()
-        self.amplitude = ampltiude
+        self.amplitude = amplitude
         self.frequency = frequency
         self.t0 = now()