diff --git a/ohmpi/hardware_components/abstract_hardware_components.py b/ohmpi/hardware_components/abstract_hardware_components.py
index ff156cd4b448786583b4306e93a82d5020b11037..67815c997d9e2febce3a087f87d5812f8ed30b4f 100644
--- a/ohmpi/hardware_components/abstract_hardware_components.py
+++ b/ohmpi/hardware_components/abstract_hardware_components.py
@@ -298,6 +298,7 @@ class TxAbstract(ABC):
         self.tx_sync = kwargs.pop('tx_sync', Event())
         self.exec_logger.debug(f'{self.model} TX initialization')
         self._pwr_state = 'off'
+        self._measuring = 'off'
 
     @property
     def gain(self):
@@ -383,6 +384,14 @@ class TxAbstract(ABC):
         assert value >= 0.
         self._latency = value
 
+    @property
+    def measuring(self):
+        return self._measuring
+
+    @measuring.setter
+    def measuring(self, mode="off"):
+        self.measuring = mode
+
     @property
     def polarity(self):
         return self._polarity
diff --git a/ohmpi/hardware_components/mb_2024_0_2.py b/ohmpi/hardware_components/mb_2024_0_2.py
index 28beda4becba9ce4e0d1579a4d32fb5f7273513e..126b1db3df39b56e92da04bd9e6f9309e32257d6 100644
--- a/ohmpi/hardware_components/mb_2024_0_2.py
+++ b/ohmpi/hardware_components/mb_2024_0_2.py
@@ -83,12 +83,17 @@ class Tx(Tx_mb_2023):
         self._pwr_latency = kwargs['pwr_latency']
 
         # Initialize LEDs
-        self.pin4 = self.mcp_board.get_pin(4)  # Ohmpi_run
+        self.pin4 = self.mcp_board.get_pin(4)  # OhmPi_run
         self.pin4.direction = Direction.OUTPUT
         self.pin4.value = True
-        self.pin6 = self.mcp_board.get_pin(6)
+        self.pin5 = self.mcp_board.get_pin(5)  # OhmPi_measure
+        self.pin5.direction = Direction.OUTPUT
+        self.pin5.value = False
+        self.pin6 = self.mcp_board.get_pin(6)  # OhmPi_stack
         self.pin6.direction = Direction.OUTPUT
         self.pin6.value = False
+
+        # Initialize DPS relays
         self.pin2 = self.mcp_board.get_pin(2)  # dps -
         self.pin2.direction = Direction.OUTPUT
         self.pin2.value = False
@@ -99,6 +104,17 @@ class Tx(Tx_mb_2023):
         if not subclass_init:
             self.exec_logger.event(f'{self.model}\ttx_init\tend\t{datetime.datetime.utcnow()}')
 
+    @property
+    def measuring(self):
+        return self._measuring
+    @measuring.setter
+    def measuring(self, mode="off"):
+        self.measuring = mode
+        if mode == "on":
+            self.pin5.value = True
+        elif mode == "off":
+            self.pin5.value = False
+
     def inject(self, polarity=1, injection_duration=None):
         # add leds?
         self.pin6.value = True
diff --git a/ohmpi/hardware_system.py b/ohmpi/hardware_system.py
index 2f4d596c3027c0e2822d0aae5eb652454d108797..2d732bdcd3236a5c57f61517ace55350498ddd20 100644
--- a/ohmpi/hardware_system.py
+++ b/ohmpi/hardware_system.py
@@ -612,7 +612,7 @@ class OhmPiHardware:
         if self.tx.pwr.pwr_state == 'off':
              self.tx.pwr.pwr_state = 'on'
         #     switch_pwr_off = True
-
+        self.tx.measuring = 'on'
         self._gain_auto(vab=vab)
         assert 0. <= duty_cycle <= 1.
         if duty_cycle < 1.:
@@ -629,6 +629,7 @@ class OhmPiHardware:
         self.tx.pwr.pwr_state = 'off'
         if switch_tx_pwr_off:
             self.pwr_state = 'off'
+        self.tx.measuring = 'off'
 
     def _vab_pulse(self, vab=None, duration=1., sampling_rate=None, polarity=1, append=False):
         """ Gets VMN and IAB from a single voltage pulse
@@ -657,6 +658,7 @@ class OhmPiHardware:
         self.tx.polarity = 0   #TODO: is this necessary?
         if switch_pwr_off:
             self.tx.pwr.pwr_state = 'off'
+
     def _vab_pulses(self, vab, durations, sampling_rate, polarities=None, append=False):
         switch_pwr_off, switch_tx_pwr_off = False, False