diff --git a/ohmpi/hardware_components/abstract_hardware_components.py b/ohmpi/hardware_components/abstract_hardware_components.py
index 0abc3e8261b1bb1db631841b0c0cd2cdebc1213f..977736fd22c8ff69262a0a637588be66bc645ee6 100644
--- a/ohmpi/hardware_components/abstract_hardware_components.py
+++ b/ohmpi/hardware_components/abstract_hardware_components.py
@@ -379,7 +379,7 @@ class RxAbstract(ABC):
         self._adc_gain = 1.
         self._max_sampling_rate = np.inf
         self._latency = kwargs.pop('latency', 0.)
-        self._bias = 0.
+        self._bias = kwargs.pop('bias', 0.)
 
     @property
     def adc_gain(self):
diff --git a/ohmpi/hardware_components/ohmpi_card_3_15.py b/ohmpi/hardware_components/ohmpi_card_3_15.py
index 20c93a1016c40e072d84543896a192b23ed70d6d..2a88de919c5b35c44fbf9e7253073de6565b127d 100644
--- a/ohmpi/hardware_components/ohmpi_card_3_15.py
+++ b/ohmpi/hardware_components/ohmpi_card_3_15.py
@@ -30,6 +30,8 @@ RX_CONFIG['sampling_rate'] = RX_CONFIG.pop('sampling_rate', sampling_rate)
 RX_CONFIG['data_rate'] = RX_CONFIG.pop('data_rate', data_rate)
 RX_CONFIG['coef_p2'] = RX_CONFIG.pop('coef_p2', 2.5)
 RX_CONFIG['latency'] = RX_CONFIG.pop('latency', 0.01)
+RX_CONFIG['bias'] = RX_CONFIG.pop('bias', 0.)
+
 
 # *** TX ***
 # ADC for current
@@ -52,6 +54,8 @@ TX_CONFIG['default_voltage'] = np.min([TX_CONFIG.pop('default_voltage', np.inf),
 # TX_CONFIG['pwr_switch_on_warm_up'] = TX_CONFIG.pop('pwr_switch_on_warmup', pwr_switch_on_warmup)
 TX_CONFIG['mcp_board_address'] = TX_CONFIG.pop('mcp_board_address', tx_mcp_board_address)
 TX_CONFIG['low_battery'] = TX_CONFIG.pop('low_battery', low_battery)
+TX_CONFIG['latency'] = TX_CONFIG.pop('latency', 0.01)
+TX_CONFIG['bias'] = TX_CONFIG.pop('bias', 0.)
 
 
 def _gain_auto(channel):
@@ -115,6 +119,8 @@ class Tx(TxAbstract):
         self.pin4 = self.mcp_board.get_pin(4)  # Ohmpi_run
         self.pin4.direction = Direction.OUTPUT
         self.pin4.value = True
+        self._latency = kwargs.pop('latency', TX_CONFIG['latency'])
+        self._bias = kwargs.pop('bias', TX_CONFIG['bias'])
         self.exec_logger.event(f'{self.board_name}\ttx_init\tend\t{datetime.datetime.utcnow()}')
 
     @property
@@ -228,6 +234,8 @@ class Rx(RxAbstract):
         self._coef_p2 = kwargs.pop('coef_p2', RX_CONFIG['coef_p2'])
         self._voltage_max = kwargs.pop('voltage_max', RX_CONFIG['voltage_max'])
         self._sampling_rate = kwargs.pop('sampling_rate', sampling_rate)
+        self._latency = kwargs.pop('latency', RX_CONFIG['latency'])
+        self._bias = kwargs.pop('bias', RX_CONFIG['bias'])
         self.exec_logger.event(f'{self.board_name}\trx_init\tend\t{datetime.datetime.utcnow()}')
 
     @property
@@ -256,6 +264,6 @@ class Rx(RxAbstract):
         """ Gets the voltage VMN in Volts
         """
         self.exec_logger.event(f'{self.board_name}\trx_voltage\tbegin\t{datetime.datetime.utcnow()}')
-        u = -AnalogIn(self._ads_voltage, ads.P0, ads.P1).voltage * self._coef_p2 * 1000. - self._bias  # TODO: check if it should be negated
+        u = -AnalogIn(self._ads_voltage, ads.P0, ads.P1).voltage * self._coef_p2 * 1000. + self._bias  # TODO: check if it should be negated
         self.exec_logger.event(f'{self.board_name}\trx_voltage\tend\t{datetime.datetime.utcnow()}')
         return u
diff --git a/ohmpi/hardware_system.py b/ohmpi/hardware_system.py
index 262d98415214ea762377e04240d7d500f231457f..eb9491a7cd0bfbdfc182baf5d7ed842a83394b80 100644
--- a/ohmpi/hardware_system.py
+++ b/ohmpi/hardware_system.py
@@ -323,7 +323,8 @@ class OhmPiHardware:
         plt.show()
 
     def calibrate_rx_bias(self):
-        self.rx._bias = (np.mean(self.readings[self.readings[:, 2] == 1, 4]) + np.mean(self.readings[self.readings[:, 2] == -1, 4])) / 2.
+        self.rx._bias = (np.mean(self.readings[self.readings[:, 2] == 1, 4])
+                         + np.mean(self.readings[self.readings[:, 2] == -1, 4])) / 2.
 
     def vab_square_wave(self, vab, cycle_duration, sampling_rate=None, cycles=3, polarity=1, append=False):
         self.exec_logger.event(f'OhmPiHardware\tvab_square_wave\tbegin\t{datetime.datetime.utcnow()}')