diff --git a/Software/VNA_embedded/Application/Drivers/stm.hpp b/Software/VNA_embedded/Application/Drivers/stm.hpp
index 769407f..19f3e19 100644
--- a/Software/VNA_embedded/Application/Drivers/stm.hpp
+++ b/Software/VNA_embedded/Application/Drivers/stm.hpp
@@ -22,6 +22,8 @@ static inline int8_t getTemperature() {
 	HAL_ADC_Start(&hadc1);
 	HAL_ADC_PollForConversion(&hadc1, 100);
 	int16_t adc = HAL_ADC_GetValue(&hadc1);
+	// convert to used reference during calibration
+	adc = (int32_t) adc * 3300 / TEMPSENSOR_CAL_VREFANALOG;
 	int16_t rangeFrom = *TEMPSENSOR_CAL2_ADDR - *TEMPSENSOR_CAL1_ADDR;
 	int16_t rangeTo = TEMPSENSOR_CAL2_TEMP - TEMPSENSOR_CAL1_TEMP;
 	adc -= *TEMPSENSOR_CAL1_ADDR;
diff --git a/Software/VNA_embedded/Src/main.c b/Software/VNA_embedded/Src/main.c
index 51c7663..c2393a9 100644
--- a/Software/VNA_embedded/Src/main.c
+++ b/Software/VNA_embedded/Src/main.c
@@ -235,7 +235,7 @@ static void MX_ADC1_Init(void)
   /** Common config
   */
   hadc1.Instance = ADC1;
-  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
+  hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV4;
   hadc1.Init.Resolution = ADC_RESOLUTION_12B;
   hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
   hadc1.Init.GainCompensation = 0;
@@ -274,7 +274,7 @@ static void MX_ADC1_Init(void)
     Error_Handler();
   }
   /* USER CODE BEGIN ADC1_Init 2 */
-
+  HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED);
   /* USER CODE END ADC1_Init 2 */
 
 }
diff --git a/Software/VNA_embedded/VNA_embedded.ioc b/Software/VNA_embedded/VNA_embedded.ioc
index 586e12a..8aa12ab 100644
--- a/Software/VNA_embedded/VNA_embedded.ioc
+++ b/Software/VNA_embedded/VNA_embedded.ioc
@@ -1,6 +1,7 @@
 #MicroXplorer Configuration settings - do not modify
 ADC1.Channel-0\#ChannelRegularConversion=ADC_CHANNEL_TEMPSENSOR_ADC1
-ADC1.IPParameters=Rank-0\#ChannelRegularConversion,master,Channel-0\#ChannelRegularConversion,SamplingTime-0\#ChannelRegularConversion,OffsetNumber-0\#ChannelRegularConversion,NbrOfConversionFlag
+ADC1.ClockPrescaler=ADC_CLOCK_ASYNC_DIV4
+ADC1.IPParameters=Rank-0\#ChannelRegularConversion,master,Channel-0\#ChannelRegularConversion,SamplingTime-0\#ChannelRegularConversion,OffsetNumber-0\#ChannelRegularConversion,NbrOfConversionFlag,ClockPrescaler
 ADC1.NbrOfConversionFlag=1
 ADC1.OffsetNumber-0\#ChannelRegularConversion=ADC_OFFSET_NONE
 ADC1.Rank-0\#ChannelRegularConversion=1