diff --git a/Core/Src/main.c b/Core/Src/main.c
index a4ac7bf..9201045 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -634,7 +634,7 @@ static void MX_TIM1_Init(void)
 
   /* USER CODE END TIM1_Init 1 */
   htim1.Instance = TIM1;
-  htim1.Init.Prescaler = 199;
+  htim1.Init.Prescaler = 19;
   htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
   htim1.Init.Period = 99;
   htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
diff --git a/RealtimeOscilloscope.ioc b/RealtimeOscilloscope.ioc
index ee8fc73..6a4548a 100644
--- a/RealtimeOscilloscope.ioc
+++ b/RealtimeOscilloscope.ioc
@@ -1223,7 +1223,7 @@ TIM1.Channel-Output\ Compare1\ No\ Output=TIM_CHANNEL_1
 TIM1.IPParameters=Prescaler,Period,Channel-Output Compare1 No Output,OCMode_1
 TIM1.OCMode_1=TIM_OCMODE_TOGGLE
 TIM1.Period=99
-TIM1.Prescaler=199
+TIM1.Prescaler=19
 TIM5.Channel-PWM\ Generation4\ CH4=TIM_CHANNEL_4
 TIM5.IPParameters=Channel-PWM Generation4 CH4
 USART1.IPParameters=VirtualMode-Asynchronous
diff --git a/src/app/oscilloscopecontroller.cpp b/src/app/oscilloscopecontroller.cpp
index 5d7512d..9b37745 100644
--- a/src/app/oscilloscopecontroller.cpp
+++ b/src/app/oscilloscopecontroller.cpp
@@ -111,15 +111,15 @@ void Controller::onCheckBoxTriggerCheckState(bool checked)
 void Controller::doShowAnalogSignal() {
 
 	/*
-	 * 460px for 8 div
+	 * 640px for 8 div
 	 * fs = 100kHz => 100 samples/ms
-	 * 500	us/div =>  400 samples => scale =  400/460 =  0,870
-	 * 1	ms/div =>  800 samples => scale =  800/460 =  1,739
-	 * 2	ms/div => 1600 samples => scale = 1600/460 =  3,478
-	 * 5	ms/div => 4000 samples => scale = 4000/460 =  8,696
-	 * 10	ms/div => 8000 samples => scale = 8000/460 = 17,391
+	 * 500	us/div =>  400 samples => scale =  400/640 =  0,625
+	 * 1	ms/div =>  800 samples => scale =  800/640 =  1,25
+	 * 2	ms/div => 1600 samples => scale = 1600/640 =  2,5
+	 * 5	ms/div => 4000 samples => scale = 4000/640 =  6,25
+	 * 10	ms/div => 8000 samples => scale = 8000/640 = 12,5
 	 */
-	static float scales[7] = {0.87,0.87,1.739,3.478,8.696,17.391,17.391};
+	static float scales[7] = {0.625, 0.625, 1.25, 2.5, 6.25, 12.5, 12.5}; // tab for 100kHz
 	float scale = scales[this->_tdivValue];
 	gui().drawGraphPoints(_adcValuesBuffer, _adcValuesBufferSize, scale);
 }