diff --git a/TLM_tool/hp3497a_lib.py b/TLM_tool/hp3497a_lib.py
index a52c37a4fe9ca5be87cea16e78806212fc9c03ae..b07f7d22ee72930f74092b2916b04323fd325476 100644
--- a/TLM_tool/hp3497a_lib.py
+++ b/TLM_tool/hp3497a_lib.py
@@ -232,7 +232,7 @@ class hp3497a(object):
         Description
         -----------
         The Digital Close (DC) command is used with the actuator assemblies. 
-        For the actuator/digital assembly (Option 110) DC connects the normal open (NO) position relay to common
+        For the actuator/digital assembly (Option 110) DC connects the normal open (NO) position relay to common (bit 1)
 
         Notes
         -----
@@ -240,9 +240,9 @@ class hp3497a(object):
         2) Up to 16 channels may be included in the DC command
         3) Power On State : All relays in Normal Closed position
         """
-        command = "DC"
+        command = f"DC{slot},"
         for i,channel in enumerate(channels):
-            if i != len(channels-1):
+            if i != len(channels)-1:
                 command = command + f"{channel},"
             else:
                  command = command + f"{channel}"
@@ -269,7 +269,7 @@ class hp3497a(object):
 
         Description
         ----------
-        DO connects the normal open position of the channel relay(s) addressed to common
+        DO connects the normal closed position of the channel relay(s) addressed to common (bit 0)
         Channel relays not specified in the DO command remain in the previous state
 
         Notes
@@ -279,13 +279,14 @@ class hp3497a(object):
         3) Power On State : All relays in Normal Closed position
         """
         
-        command = "DO"
+        command = f"DO{slot},"
         for i,channel in enumerate(channels):
-            if i != len(channels-1):
+            if i != len(channels)-1:
                 command = command + f"{channel},"
             else:
                  command = command + f"{channel}"
 
+        print(command)
         self.inst.write(command)
    
 
@@ -420,7 +421,7 @@ class hp3497a(object):
         """
         VT1 = INTERNAL (auto from hp3497a (power on))
         VT2 = EXTERNAL (external from trigger pulses)
-        VT3 = SOFTWARE (Trigger and get the number of readings set by Vn)
+        VT3 = SOFTWARE (Trigger and get the number of readings set by VNn)
         VT4 = HOLD
         """
         self.inst.write(f"VT{mode}")
diff --git a/TLM_tool/keithley224_lib.py b/TLM_tool/keithley224_lib.py
index 9c40c0061133598a10c84593a1076dd10ff14c44..58306986e825ecdb733de79adcc831a8f3fcaeb2 100644
--- a/TLM_tool/keithley224_lib.py
+++ b/TLM_tool/keithley224_lib.py
@@ -33,7 +33,13 @@ class keithley224(object):
         self.rm = pyvisa.ResourceManager()
         self.inst = self.rm.open_resource(address)
         self.inst.timeout = None
-        self.inst.control_ren(5) #local lockout blocks the tool 
+        self.inst.control_ren(5) #local lockout blocks the tool
+        
+        self.inst.clear() #reset the device
+        self.operate = False
+        self.current = 0
+        self.voltage = 3
+        self.time = 50e-3
 
     def display(self,number):
         """
@@ -92,6 +98,7 @@ class keithley224(object):
 
         sci_value = "{:.4E}".format(value) #according to tool manual for current
         self.inst.write(f"I{sci_value}X")
+        self.current = value
 
     def set_voltage_limit(self,value):
         """
@@ -105,6 +112,7 @@ class keithley224(object):
         """
         sci_value=  "{:.2E}".format(value) #manual format for voltage
         self.inst.write(f"V{sci_value}X")
+        self.voltage = value
 
     def set_time(self,value):
         """
@@ -117,6 +125,7 @@ class keithley224(object):
         """
         sci_value = "{:.3E}".format(value) # manual format for dwell time
         self.inst.write(f"W{sci_value}X")
+        self.time = value
 
     def __del__(self):
         """
@@ -139,6 +148,18 @@ class keithley224(object):
 
         return I,V,W
 
+    def change_operation_mode(self):
+        """
+        Changes the operation mode
+        Standby -> On
+        On -> Standby
+        """
+        if self.operate == True:
+            self.set_operation(0)
+            self.operate = False
+        else:
+            self.set_operation(1)
+            self.operate = True
         
     
     
diff --git a/TLM_tool/keithley_first.ipynb b/TLM_tool/keithley_first.ipynb
index 5bdc6c6d1b93ed9c665cbfd782515a564e8f3e1e..50279dc3dcedd4a476c8134ecb86f6005e399ae9 100644
--- a/TLM_tool/keithley_first.ipynb
+++ b/TLM_tool/keithley_first.ipynb
@@ -2,14 +2,16 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 11,
    "id": "4d4cbcef-908f-4cd0-89be-790fccb51cb3",
    "metadata": {},
    "outputs": [],
    "source": [
     "import keithley224_lib \n",
+    "import time\n",
     "\n",
-    "k224 = keithley224_lib.keithley224()"
+    "k224 = keithley224_lib.keithley224()\n",
+    "time.sleep(5)"
    ]
   },
   {
@@ -29,7 +31,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "\n",
     "k224.set_time(999e-3)"
    ]
   },
@@ -40,7 +41,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "k224.display(0)"
+    "k224.display(2)"
    ]
   },
   {
@@ -85,7 +86,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 9,
    "id": "da3d49f4",
    "metadata": {},
    "outputs": [
@@ -107,13 +108,32 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
-   "id": "80ea11ce",
+   "execution_count": 10,
+   "id": "f742d0fc-e66d-4c28-a3eb-9d69b9c88326",
    "metadata": {},
    "outputs": [],
    "source": [
+    "time.sleep(10)\n",
     "del k224"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "id": "89c69ed9-d327-4718-9db3-e6a652965808",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "k224.change_operation_mode()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "2c453ade-c9d3-440b-9a10-c25b880f7093",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
diff --git a/TLM_tool/test_DAQ_class.ipynb b/TLM_tool/test_DAQ_class.ipynb
new file mode 100644
index 0000000000000000000000000000000000000000..83b95809a00982623ad5ba2d4b5feaa10fde37c7
--- /dev/null
+++ b/TLM_tool/test_DAQ_class.ipynb
@@ -0,0 +1,828 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "49a73163-c563-41e6-92fd-7b96fa3a9543",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import hp3497a_lib"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "7caab834-2486-4f97-ad31-d8c78c4fb5f0",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "daq = hp3497a_lib.hp3497a()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "2bc34995-c7e4-4280-86f1-fdc0f7f112c7",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      " \n",
+      "    This is a the control class of hp3497a  based on the command directory that can be found in the manual HP3497A Operating Programming and Configuration  Chapter 6\n",
+      "\n",
+      "    Commands That are not stil present in this library:\n",
+      "    1) Analog External Increment (page 287)\n",
+      "    2) Counter Functions (Pages 291-295)\n",
+      "    3) Digital Interrupt commands (Page 297,page 299)\n",
+      "    4) Service Request Enable (Pages 303-304)\n",
+      "    5) System Lock (Page 305)\n",
+      "    6) Status Register Read (Page 308)\n",
+      "    7) System Write (Page 310)\n",
+      "    7) Timer Commands (Page 310-314)\n",
+      "    8) Irrelevant Voltmeter Commands \n",
+      "    \n",
+      "    \n"
+     ]
+    }
+   ],
+   "source": [
+    "print(daq.__doc__)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 39,
+   "id": "424cb55d-ccf0-4ec7-b0e4-2d22bf30f35d",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "daq.digital_viewed_slot(3)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "77514d49-5d12-45e8-99b3-411b12ed0ee6",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "\"import time\\nt1 = time.time()\\nprint(t1)\\nfor i in range(2**16):\\n    octal = format(i,'o')\\n    daq.digital_write(3,octal)\\n\\nt2= time.time()\\n\\nprint(t2-t1)\\n\\n963s to test all combinations instantely\\n\""
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "\"\"\"import time\n",
+    "t1 = time.time()\n",
+    "print(t1)\n",
+    "for i in range(2**16):\n",
+    "    octal = format(i,'o')\n",
+    "    daq.digital_write(3,octal)\n",
+    "\n",
+    "t2= time.time()\n",
+    "\n",
+    "print(t2-t1)\n",
+    "\n",
+    "963s to test all combinations instantely\n",
+    "\"\"\" "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "id": "a1c4949a-08c9-4989-b70c-1ddb16cad226",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "daq.digital_close(3,1,2,3)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 42,
+   "id": "e25d363d-96ed-426f-a62c-62dcfc5d4e1b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "daq.voltmeter_trigger(1)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "id": "6f5a44fb-266a-4ca3-b4d5-1697c7460822",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "daq.analog_input(0)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "id": "a68427e3-04b3-4e5f-b2d8-9176fb47aa19",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "daq.analog_reset()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 41,
+   "id": "4f2238db-7813-4bde-af6d-cd756caa8751",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "daq.digital_viewed_slot(\"\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 47,
+   "id": "58990b95-64e8-42e6-b9c2-e888f65119be",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
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+      "+0.47197E+0\n",
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+      "+0.47299E+0\n",
+      "+0.47312E+0\n"
+     ]
+    }
+   ],
+   "source": [
+    "import time\n",
+    "\n",
+    "\n",
+    "\n",
+    "t_end = time.time() + 30\n",
+    "while time.time()<=t_end:\n",
+    "    print(daq.inst.read().strip())"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "268fd007-4458-4ad9-a600-a72e34adbe17",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}