diff --git a/MTB_Test.py b/MTB_Test.py
new file mode 100644
index 0000000..680b681
--- /dev/null
+++ b/MTB_Test.py
@@ -0,0 +1,279 @@
+# -*- coding: utf-8 -*-
+"""
+MTB Calibration + Qualification Script (v3)
+-----------------------------------------
+Auf Wunsch angepasste Zielgrenzen und Iterationen :
+* **Kalibrierung**: |ppm| < 1000 als Ziel, max 5 Iterationen.
+* **Qualifikation**: ``OK`` ≤ 10 000 ppm (≈1 nA @ 100 µA FS),
+  ``COOL`` ≤ 5 000 ppm ; sonst ``FAIL``.
+Weitere Features aus v2 bleiben unverändert.
+"""
+
+from __future__ import annotations
+import sys, time, numpy as np, pyvisa, serial.tools.list_ports
+from typing import Sequence
+from pymeasure.instruments.keithley import Keithley2400, KeithleyDMM6500
+from ModuleTestBox import ModuleTestBox
+from sklearn.linear_model import LinearRegression
+import json
+
+# ---------- Gerätesuche -------------------------------------------------------
+rm = pyvisa.ResourceManager()
+
+def find_visa(hint: str) -> str:
+    for res in rm.list_resources():
+        if hint.lower() in res.lower():
+            return res
+    raise RuntimeError(f'VISA-Resource "{hint}" nicht gefunden')
+
+def find_serial(hint: str) -> str:
+    for port, desc, _ in serial.tools.list_ports.comports():
+        if hint.lower() in desc.lower():
+            return port
+    raise RuntimeError(f'Serial-Port "{hint}" nicht gefunden')
+
+# ---------- User-Prompt -------------------------------------------------------
+
+def ask_user(prompt: str = "Last umgesteckt?  <Enter>=OK, n=repeat, q=quit → ") -> str:
+    while True:
+        ans = input(prompt).strip().lower()
+        if ans in ("", "y", "yes"):
+            return "ok"
+        if ans in ("n", "no"):
+            return "repeat"
+        if ans == "q":
+            sys.exit("Abbruch durch Benutzer")
+        print("Bitte nur Enter, n oder q eingeben …")
+
+# ---------- Mess-Hilfsfunktionen ---------------------------------------------
+
+VOLTAGES          = np.arange(10, 201, 10)  # 10 … 200 V, 10 V-Step
+VOLTAGES_FULLRANGE = np.arange(10, 1001, 10)  # 1 … 100 V, 10 V-Step
+CAL_TARGET        = 100                     # ppm-Band für Kalibrierung
+CAL_MAX_ITERS     = 5                       # max. Iterationen
+QUAL_LIMIT_COOL   = 100                     # ppm für "cool"
+QUAL_LIMIT_OK     = 500                     # ppm für "ok" -> 1nA @ 2uA
+SHUNT_OHM         = 102.9807197e6           # Referenz-Widerstand (Ω)
+SETTLING_S        = 0.2                     # Settling-Zeit pro Step
+
+
+def sweep_currents(kei: Keithley2400, mtb: ModuleTestBox):
+    """Sweep über VOLTAGES - liefert (I_ref, I_dut)."""
+    I_ref, I_dut = [], []
+    kei.enable_source()
+    for v in VOLTAGES:
+        kei.source_voltage = v
+        time.sleep(SETTLING_S)
+        I_ref.append(v / SHUNT_OHM)
+        I_dut.append(mtb.GetI() * -1e-12)
+    kei.disable_source()
+    return np.asarray(I_ref), np.asarray(I_dut)
+
+def sweep_currents_fullRange(kei: Keithley2400, mtb: ModuleTestBox):
+    """Sweep über VOLTAGES - liefert (I_ref, I_dut)."""
+    I_ref, I_dut = [], []
+    kei.enable_source()
+    for v in VOLTAGES_FULLRANGE:
+        kei.source_voltage = v
+        time.sleep(SETTLING_S)
+        I_ref.append(v / SHUNT_OHM)
+        I_dut.append(mtb.GetI() * -1e-12)
+    kei.disable_source()
+    return np.asarray(I_ref), np.asarray(I_dut)
+
+def lineaer_fit(x: Sequence[float], y: Sequence[float]) -> tuple[float, float]:
+    """Lineare Regression: y = m * x + b"""
+    x = np.asarray(x).reshape(-1, 1)
+    y = np.asarray(y).reshape(-1, 1)
+    model = LinearRegression()
+    model.fit(x, y)
+    m = model.coef_[0][0]
+    b = model.intercept_[0]
+    return m, b
+
+
+def gain_ppm(I_ref: Sequence[float], I_dut: Sequence[float]) -> float:
+    slope, offset = np.polyfit(I_ref, I_dut, 1)
+    # print(f"  Fit: {curve:.3e} * x² + {slope:.3e} * x + {offset:.3e}")
+    return (1.0 / slope - 1.0) * 1e6
+
+# ---------- Hauptprogramm -----------------------------------------------------
+
+dataToSave = []
+
+if __name__ == "__main__":
+    serial_id = int(input("Enter the MTB Serial ID [default 100]: ") or "100")
+    print(f"Serial ID = {serial_id}")
+
+    with Keithley2400(find_serial("Prolific")) as kei, \
+         KeithleyDMM6500(find_visa("0x05E6::0x6500")) as dmm, \
+         ModuleTestBox(hints=["VID:PID=CAFE:4001"], verbose=False) as mtb:
+
+        print("Verbunden.  FW:", mtb.GetFirmwareVersion())
+        if mtb.HV_IsLocked():
+            sys.exit("HV ist gesperrt - Abbruch")
+
+        mtb.SetBoardID(serial_id)
+        mtb.SetMeanCount(60)
+        dataToSave.append({"serial_id": serial_id, "firmware": mtb.GetFirmwareVersion()}) 
+        mtb.HV_SetAll(0)
+
+        kei.apply_voltage(compliance_current=11e-6)  # 11 µA-Limit
+
+        dataChannels = []
+
+        for ch in range(1, 9):
+            print(f"\n=== Channel {ch} ===")
+            mtb.SelectChannel(ch)
+            mtb.HV_Enable(True)
+            mtb.AdjustScaleI(0)
+
+            # ------ Kalibrier-Loop ------
+            corr_ppm = 0.0
+            for it in range(CAL_MAX_ITERS):
+                try:
+                    mtb.AdjustScaleI(round(corr_ppm))
+                except Exception as e:
+                    print(f"  Fehler bei der Kalibrierung: {e}")
+                    break
+                I_ref, I_dut = sweep_currents(kei, mtb)
+                ppm = gain_ppm(I_ref, I_dut)
+                print(f"  Iter {it}: gain error = {ppm:+.0f} ppm")
+                if abs(ppm) < CAL_TARGET:
+                    break
+                corr_ppm += ppm
+            print(f"→ final gain error for channel {ch}: {corr_ppm:+.0f} ppm")
+
+            # ------ Qualifikations-Sweep ------
+            I_ref, I_dut = sweep_currents(kei, mtb)
+            ppm_chk = abs(gain_ppm(I_ref, I_dut))
+            if ppm_chk <= QUAL_LIMIT_COOL:
+                status = "COOL"  # ≤5 k
+            elif ppm_chk <= QUAL_LIMIT_OK:
+                status = "OK"    # ≤10 k
+            else:
+                status = "FAIL"
+            print(f"Qualification: {ppm_chk:.0f} ppm → {status}")
+
+            print("Doing full range sweep …")
+            I_ref, I_dut = sweep_currents_fullRange(kei, mtb)
+
+            kei.beep(1000, 0.5)
+
+            # ------ Benutzer Prompt ------
+            if ask_user() == "repeat":
+                print("Wiederhole Kanal …")
+                ch -= 1
+                continue
+
+            data = {
+                'v': VOLTAGES_FULLRANGE.tolist(),
+                'i_ref': I_ref.tolist(),
+                'i_dut': I_dut.tolist()
+            }
+
+            dataChannels.append({
+                "channel": ch,
+                "gain_error": corr_ppm,
+                "qualification": status,
+                "data": data
+            })
+
+        mtb.HV_SetAll(0)
+
+        print("\nAlle Kanäle bearbeitet. Kalibrierung beendet.")
+        dataToSave.append({"HVchannels": dataChannels})
+        print("Tests starten …")
+        print("Interlock aktivieren …")
+
+        while True:
+            if mtb.HV_IsLocked():
+                print("Interlock detected")
+                break
+            time.sleep(0.1)
+
+        print("Interlock Reset Button drücken")
+        print(mtb.HV_GetAll())
+
+        while True:
+            if mtb.HV_GetAll():
+                print("Interlock released")
+                break
+            time.sleep(0.1)
+
+        input("Interlock Reset Button gedrückt. <Enter> zum Fortfahren …")
+        print("Bias Test starten …")
+
+        dataChannels = []
+
+        dmm.measure_current(max_current=0.001)
+        dmm.current_nplc = 12
+        
+        for ch in range(1, 9):
+            print(f"\n=== Channel {ch} ===")
+            mtb.SelectChannel(ch)
+            mtb.Bias_Enable(True)
+
+            voltages = range(18, 901, 9)
+            currents = []
+            dmmcurrent = []
+            failed = False
+            for v in voltages:
+                mtb.Bias_SetV(v / 1000)
+                time.sleep(SETTLING_S/2)
+                dmmcur = dmm.current
+                while dmmcur > 1:
+                    dmmcur = dmm.current
+                dmmcurrent.append(dmmcur * 1e6)
+                current = mtb.Bias_GetI()
+                currents.append(current * 1e6)
+
+                if abs(current - dmmcur) >= (2e-6 + (v/300 * 1e-6)):
+                    print(f"  Bias-Test für Kanal {ch} fehlgeschlagen: {current:.3e} != {dmmcur:.3e}")
+                    failed = True
+
+            mtb.Bias_SetV(0)
+            mtb.Bias_Enable(False)
+
+            if not failed:
+                print(f"Bias-Test für Kanal {ch} erfolgreich")
+                status = "OK"
+            else:
+                status = "FAIL"
+
+            kei.beep(1000, 0.5)
+
+            # ------ Benutzer Prompt ------
+            if ask_user() == "repeat":
+                print("Wiederhole Kanal …")
+                ch -= 1
+                continue
+
+            dataChannels.append({
+                "channel": ch,
+                "voltages": list(voltages),
+                "currents": currents,
+                "dmmcurrent": dmmcurrent,
+                "status": status
+            })
+
+        print("\nAlle Kanäle bearbeitet. Bias-Test beendet.")
+        dataToSave.append({"Biaschannels": dataChannels})
+        print("Tests abgeschlossen. Daten speichern …")
+        # check if file exists, if yes, append number to filename
+        i = 1
+        #save json data to file
+        filename = f"TestResults/MTB_Test_{serial_id}.json"
+        while True:
+            try:
+                with open(filename, "x") as f:
+                    json.dump(dataToSave, f, indent=4)
+                break
+            except FileExistsError:
+                filename = f"TestResults/MTB_Test_{serial_id}_{i}.json"
+                i += 1
+        print("Daten gespeichert.")
+        print("Programm beendet.")
+
+            
+
diff --git a/MTB_UploadResults.py b/MTB_UploadResults.py
new file mode 100644
index 0000000..bfa972d
--- /dev/null
+++ b/MTB_UploadResults.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Restore calibration settings on MTB:
+- Seriennummer eingeben
+- Neueste JSON-Datei laden
+- meanCount und AdjustScaleI pro Kanal anwenden
+"""
+
+import json
+import glob
+import os
+import sys
+import serial.tools.list_ports
+from ModuleTestBox import ModuleTestBox
+
+def find_latest_file(serial_id: int, folder: str = "TestResults") -> str:
+    pattern = os.path.join(folder, f"MTB_Test_{serial_id}*.json")
+    files = glob.glob(pattern)
+    if not files:
+        raise FileNotFoundError(f"Keine Dateien gefunden für Serial {serial_id!r}")
+    # sortiere nach Suffix (höchste Zahl zuletzt)
+    files.sort(key=lambda f: int(os.path.splitext(f)[0].rsplit('_',1)[-1]) if '_' in os.path.splitext(f)[0] else 0)
+    return files[-1]
+
+def prompt_mean_count() -> int:
+    while True:
+        try:
+            mc = int(input("MeanCount nicht in Datei gefunden. Bitte eingeben (z.B. 60): "))
+            return mc
+        except ValueError:
+            print("Bitte eine ganze Zahl eingeben.")
+
+def main():
+    serial_id = int(input("Seriennummer eingeben: ").strip())
+    try:
+        filename = find_latest_file(serial_id)
+    except FileNotFoundError as e:
+        print(e)
+        sys.exit(1)
+    print(f"Lade Datei: {filename}")
+    with open(filename, "r") as f:
+        data = json.load(f)
+
+    # Versuch, meanCount auszulesen
+    mean_count = None
+    for entry in data:
+        if "meanCount" in entry:
+            mean_count = entry["meanCount"]
+            break
+    if mean_count is None:
+        mean_count = prompt_mean_count()
+    print(f"Verwende meanCount = {mean_count}")
+
+    # Hole gain_error pro Kanal
+    hv_channels = next((e["HVchannels"] for e in data if "HVchannels" in e), None)
+    if hv_channels is None:
+        print("Keine HVchannels in der Datei gefunden.")
+        sys.exit(1)
+
+    # Verbinden und hochladen
+    print("Verbinde mit MTB …")
+    with ModuleTestBox(hints=["VID:PID=CAFE:4001"], verbose=False) as mtb:
+        mtb.SetBoardID(serial_id)
+        mtb.SetMeanCount(mean_count)
+        for ch_info in hv_channels:
+            ch = ch_info["channel"]
+            corr_ppm = ch_info["gain_error"]
+            print(f"Channel {ch}: AdjustScaleI({corr_ppm:+.0f})")
+            mtb.SelectChannel(ch)
+            mtb.AdjustScaleI(int(round(corr_ppm)))
+    print("Fertig. Alle Einstellungen geladen.")
+
+if __name__ == "__main__":
+    main()
diff --git a/ModuleTestBox.py b/ModuleTestBox.py
new file mode 100644
index 0000000..6681ccf
--- /dev/null
+++ b/ModuleTestBox.py
@@ -0,0 +1,344 @@
+import numpy as np
+import serial
+import serial.tools.list_ports
+
+
+class ModuleTestBox:
+
+    def __init__(self, port=None, hints=None, verbose=False):
+        self.ser = None     # port handle
+        self.port = port    # port name COMn
+        self.portdesc = ''
+        self.hints = hints
+        self.verbose = verbose
+        self.portlist = {}  # port list { port: description }
+        self.UpdateComPortList()
+
+    def __enter__(self):
+        self._Connect()
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self._Disconnect()
+        if exc_type is not None:
+            print(f"Exception {exc_type}') # occurred with value {exc_value}")
+            # except serial.SerialException:
+        return True
+
+    # Update the serial port list
+    def UpdateComPortList(self):
+        ports = serial.tools.list_ports.comports()
+        self.portlist = {}
+        if self.verbose: print('* serial ports found:')
+        for port, desc, hwid in sorted(ports):
+            self.portlist[port] = hwid
+            if self.verbose: print(f'{port:7s}: {desc}, {hwid}')
+
+    # Finds a specific serial port based on a keyword (hint) in the description
+    def FindComPort(self, hints):
+        for port, desc in self.portlist.items():
+            for hint in hints:
+                if hint in desc:
+                    self.port = port
+                    self.portdesc = desc
+                    return port
+        self.port = None
+        return None
+
+    # Checks if there is a connection to a serial port
+    def IsConnected(self):
+        return self.ser is not None
+
+    #  Connect to a serial port by specific port or a hint in the description
+    def _Connect(self):
+        if self.hints is not None:
+            self.FindComPort(self.hints)
+        if self.port is not None:
+            if self.verbose: print(f'* open {self.port:s} ({self.portdesc})')
+            self.ser = serial.Serial(self.port, 115200, timeout=0.5)
+
+    def _Disconnect(self):
+        if self.IsConnected():
+            self.ser.close()
+
+    def TestConnection(self):
+        testdata = [0x5A, 0xA5]
+        # Test connection PC <-> HV box
+        for x in testdata:
+            y = self.Echo(x)
+            if y != x:
+                print(f'Communication failed: {y:02X} should be {x:02X}')
+                return False
+        # Test ADC register read/write (repeat for all ADCs)
+        adc_ok = True
+        for channel in range(1, 9):
+            self.SelectChannel(channel)
+            for x in testdata:
+                self.ADC_RegisterWrite(0x13, x)
+                y = self.ADC_RegisterRead(0x13)
+                if y != x:
+                    print(f'ADC Register IO failed: {y:02X} should be {x:02X}')
+                    adc_ok = False
+            if self.verbose:
+                adc = self.GetADCversion()
+                print(f'CH{channel}: ADC TYPE:{adc["ver"]} REV:{adc["rev"]} ID:{adc["id"]}')
+        return adc_ok
+
+    def _PutStr(self, s):
+        self.ser.write(s.encode('ASCII'))
+
+    def _PutINT8(self, x):
+        self.ser.write(x.to_bytes(1, signed=True, byteorder='little'))
+
+    def _PutINT16(self, x):
+        self.ser.write(x.to_bytes(2, signed=True, byteorder='little'))
+
+    def _PutINT32(self, x):
+        self.ser.write(x.to_bytes(4, signed=True, byteorder='little'))
+
+    def _PutUINT8(self, x):
+        self.ser.write(x.to_bytes(1, signed=False, byteorder='little'))
+
+    def _PutUINT16(self, x):
+        self.ser.write(x.to_bytes(2, signed=False, byteorder='little'))
+
+    def _PutUINT32(self, x):
+        self.ser.write(x.to_bytes(4, signed=False, byteorder='little'))
+
+    def _GetUINT8(self):
+        bv = self.ser.read(size=1)
+        return int.from_bytes(bv, signed=False, byteorder='little')
+
+    def _GetUINT16(self):
+        bv = self.ser.read(size=2)
+        return int.from_bytes(bv, signed=False, byteorder='little')
+
+    def _GetUINT32(self):
+        bv = self.ser.read(size=4)
+        return int.from_bytes(bv, signed=False, byteorder='little')
+    
+    def _GetINT32(self):
+        bv = self.ser.read(size=4)
+        return int.from_bytes(bv, signed=True, byteorder='little')
+
+    def _Get2INT32(self):
+        bv = self.ser.read(size=8)
+        i = int.from_bytes(bv[0:4], signed=True, byteorder='little')
+        u = int.from_bytes(bv[4:8], signed=True, byteorder='little')
+        return i, u
+
+
+    def _CommandReq(self, command):
+        self.ser.write(command.encode('ASCII'))
+    
+    def _CommandRsp(self, retform):
+        n = sum(retform)
+        bv = self.ser.read(size=n)
+        # split return bytes value
+        pos = 0
+        ret = []
+        for size in retform:
+            ret.append(int.from_bytes(bv[pos:pos+size], signed=False, byteorder='little'))
+            pos += size
+        return ret
+
+    def _Request(self, command, retform):
+        self._CommandReq(command)
+        return self._CommandRsp(retform)
+
+
+    def GetFirmwareVersion(self):
+        self._CommandReq('S0')
+        n = self._GetUINT8()
+        d = [self._GetUINT8() for _ in range(n)]
+        return ''.join(chr(i) for i in d)
+    
+    def GetBoardID(self):
+        self._CommandReq('SI')
+        return self._GetUINT32()
+
+    def SetBoardID(self, id):
+        self._CommandReq('SD')
+        self._PutUINT32(id)
+
+    def SelectChannel(self, n):
+        if n-1 in range(8):
+            self._CommandReq('12345678'[n-1])
+
+    def GetI(self):
+        self._CommandReq('I')
+        return self._GetINT32()
+
+    def GetV(self):
+        self._CommandReq('V')
+        return self._GetINT32()
+
+    def GetIV(self):
+        self._CommandReq('D')
+        return self._GetINT32(), self._GetINT32()
+
+    def ScanI(self, fs, n):
+        self._CommandReq('MI')
+        self._PutUINT8(fs)
+        self._PutUINT16(n)
+        N = self._GetUINT16()
+
+        i = np.zeros(N, dtype=int)
+        for k in range(N):
+            i[k] = self._GetINT32()
+        return i
+
+    def ScanV(self, fs, n):
+        self._CommandReq('MV')
+        self._PutUINT8(fs)
+        self._PutUINT16(n)
+        N = self._GetUINT16()
+
+        u = np.zeros(N, dtype=int)
+        for k in range(N):
+            u[k] = self._GetINT32()
+        return u
+
+    def ScanIV(self, fs, n):
+        self._CommandReq('MD')
+        self._PutUINT8(fs)
+        self._PutUINT16(n)
+        N = self._GetUINT16()
+
+        i = np.zeros(N, dtype=int)
+        u = np.zeros(N, dtype=int)
+        for k in range(N):
+            i[k], u[k] = self._Get2INT32()
+        return i, u
+
+    def GetError(self):
+        status = self._Request('SE', (2,))[0]
+        if status == 0: return 'Status Ok'
+        return f'Error {status:04X}'
+
+    def GetADCversion(self):
+        self._CommandReq('SV')
+        b = self.ser.read(size=8)
+        s = ('ADE9113', 'ADE9112', 'ADE9103')[b[1]] if b[1] <= 3 else '?'
+        if len(b) >= 8:
+            id = f'{b[2]:02X}{b[3]:02X}{b[4]:02X}{b[5]:02X}{b[6]:02X}{b[7]:02X}'
+        else:
+            id = '????'
+        
+        adc = {'ver':s, 'rev':f'{b[0]:02X}', 'id':id}
+        return adc
+
+
+    
+    def SetRawData(self, unit=False):
+        self._CommandReq('SU')
+        self._PutUINT8(1 if unit else 0)
+
+    def SetMeanCount(self, n):
+        self._CommandReq('SN')
+        self._PutUINT8(n)
+
+    def AdjustOffsetI(self):
+        self._CommandReq('SCI')
+        return self._GetINT32()
+    
+    def AdjustOffsetV(self):
+        self._CommandReq('SCV')
+        return self._GetINT32()
+
+    def AdjustScaleI(self, value):
+        self._CommandReq('SAI')
+        self._PutINT32(value)
+
+    def AdjustScaleV(self, value):
+        self._CommandReq('SAV')
+        self._PutINT32(value)
+
+    def ADC_Transmit(self, txdata):
+        self._CommandReq('X1')
+        self._PutUINT32(txdata)
+
+    def ADC_Receive(self):
+        self._CommandReq('X2')
+        return self._GetUINT32()
+
+    def ADC_Transfer(self, txdata):
+        self._CommandReq('XT')
+        self._PutUINT32(txdata)
+        return self._GetUINT32()
+
+    def ADC_RegisterWrite(self, reg, value):
+        self._CommandReq('XW')
+        self._PutUINT8(reg)
+        self._PutUINT8(value)
+
+    def ADC_RegisterRead(self, reg):
+        self._CommandReq('XR')
+        self._PutUINT8(reg)
+        return self._CommandRsp((1,))[0]
+
+    def ADC_RegisterRead2(self, reg):
+        self._CommandReq('Xr')
+        self._PutUINT8(reg)
+        return self._CommandRsp((1,1))
+
+    def ReadADC_I(self):
+        self._CommandReq('XI')
+        return self._GetINT32()
+
+    def ReadADC_V(self):
+        self._CommandReq('XV')
+        return self._GetINT32()
+
+    def ReadADC_IV(self):
+        self._CommandReq('XD')
+        return self._Get2INT32()
+    
+    def ADC_Init(self):
+        self._CommandReq('XC')
+
+    def ADC_Sleep(self, sleep=True):
+        self._CommandReq('XS')
+        self._PutINT8(1 if sleep else 0)
+
+    def AddCRC(self, d):
+        self._CommandReq('XX')
+        self._PutUINT32(d)
+        return self._CommandRsp((4,))[0]
+
+    def Echo(self, din):
+        self._CommandReq('XE')
+        self._PutUINT8(din)
+        return self._CommandRsp((1,))[0]
+
+    def Bias_Enable(self, on):
+        self._CommandReq('BC')
+        self._PutINT8(1 if on else 0)
+
+    def Bias_GetAll(self):
+        self._CommandReq('BS')
+        return self._CommandRsp((1,))[0]
+
+    def Bias_SetV(self, v=0.0):
+        self._CommandReq('BV')
+        self._PutINT16(int(v*1000))
+
+    def Bias_GetI(self):
+        self._CommandReq('BI')
+        return self._GetINT32()/1000000000.0
+    
+    def HV_Enable(self, on):
+        self._CommandReq('LC')
+        self._PutINT8(1 if on else 0)
+    
+    def HV_SetAll(self, on):
+        self._CommandReq('LA')
+        self._PutINT8(1 if on else 0)
+
+    def HV_GetAll(self):
+        self._CommandReq('LS')
+        return self._CommandRsp((1,))[0]
+
+    def HV_IsLocked(self):
+        self._CommandReq('SL')
+        return self._CommandRsp((1,))[0] != 0
diff --git a/biastest.py b/biastest.py
new file mode 100644
index 0000000..506c06d
--- /dev/null
+++ b/biastest.py
@@ -0,0 +1,72 @@
+from ModuleTestBox import ModuleTestBox
+import sys, time, numpy as np, pyvisa, serial.tools.list_ports
+from pymeasure.instruments.keithley import KeithleyDMM6500
+import matplotlib.pyplot as plt
+from time import sleep
+import pandas as pd
+
+hints=["VID:PID=CAFE:4001"]
+
+# ---------- Gerätesuche -------------------------------------------------------
+rm = pyvisa.ResourceManager()
+
+def find_visa(hint: str) -> str:
+    for res in rm.list_resources():
+        if hint.lower() in res.lower():
+            return res
+    raise RuntimeError(f'VISA-Resource "{hint}" nicht gefunden')
+
+channel = []
+ref = []
+dmmcurrent = []
+ch = 2
+count = range(18, 901, 9)
+
+with ModuleTestBox(hints=hints, verbose=True) as hvp, KeithleyDMM6500(find_visa(hint='0x05E6::0x6500')) as dmm:
+    hvp.SelectChannel(ch)
+    hvp.Bias_Enable(1)
+    # hvp.Bias_SetV(0.5)
+
+    R = 1223.6841 #load resistance in Ohm
+
+    dmm.measure_current(max_current=0.001)
+    dmm.current_nplc = 12
+
+    sleep(2)
+
+    for u in count:
+        hvp.Bias_SetV(u/1000)
+
+        sleep(0.1)
+        ref.append(u*0.9092396440596435 + 0)
+        dmmcur = dmm.current
+        while dmmcur > 1:
+            dmmcur = dmm.current
+        dmmcurrent.append(dmmcur * 1e6)
+        current = hvp.Bias_GetI() * 1e6
+        channel.append(current)
+
+    # print(channel)
+
+    hvp.Bias_SetV(0)
+    hvp.Bias_Enable(0)
+
+    data = pd.DataFrame({
+        'v': count,
+        'i_hv': channel,
+        'i_dmm': dmmcurrent,
+        'i_ref': ref
+    })
+    data.to_excel('data_biasTEST.xlsx', index=False)
+
+    plt.figure()
+    plt.title('BiasingBox current measurements')
+    plt.ylabel('current [uA]')
+    plt.xlabel('measurements')
+    plt.grid()
+    plt.plot(channel, label=f'CH{ch}', marker='o', markersize=2)
+    # plt.plot(ref, label=f'ref', marker='o', markersize=2)
+    plt.plot(dmmcurrent, label=f'dmm', marker='o', markersize=2)
+    plt.legend()
+    
+    plt.show()
\ No newline at end of file
diff --git a/live_measurement.py b/live_measurement.py
new file mode 100644
index 0000000..9ec6d52
--- /dev/null
+++ b/live_measurement.py
@@ -0,0 +1,31 @@
+from pymeasure.instruments.keithley import Keithley2400
+import serial.tools.list_ports
+import pandas as pd
+from ModuleTestBox import ModuleTestBox
+from time import sleep
+import matplotlib.pyplot as plt
+
+
+channel = 7
+
+
+hints=["VID:PID=CAFE:4001"]
+
+try:
+    with ModuleTestBox(hints=hints, verbose=True) as mtb:
+        print("Connected to Device")
+
+        mtb.SelectChannel(channel)
+        mtb.Bias_Enable(False)
+        mtb.HV_Enable(True)
+
+        # sleep(2)
+
+        while True:
+            current = mtb.GetI() / 1e6
+            print(current)
+            sleep(0.5)
+except Exception as e:
+    print(e)
+    exit()
+
diff --git a/measurement.py b/measurement.py
new file mode 100644
index 0000000..6ee585b
--- /dev/null
+++ b/measurement.py
@@ -0,0 +1,134 @@
+from pymeasure.instruments.keithley import Keithley2400, KeithleyDMM6500
+import serial.tools.list_ports
+import pyvisa
+import pandas as pd
+from ModuleTestBox import ModuleTestBox
+from time import sleep
+import matplotlib.pyplot as plt
+
+rm = pyvisa.ResourceManager()
+
+def find_instr_device(hint):
+    """Scan available serial ports and return the first port whose description 
+    contains the given hint (case-insensitive). Raise ValueError if not found.
+    """
+    ports = rm.list_resources()
+    for port in ports:
+        if hint.lower() in port.lower():
+            return port
+    raise ValueError(f"No valid port found for hint '{hint}'.")
+
+def find_device(hint):
+    """Scan available serial ports and return the first port whose description 
+    contains the given hint (case-insensitive). Raise ValueError if not found.
+    """
+    ports = serial.tools.list_ports.comports()
+    for port, desc, hwid in ports:
+        if hint.lower() in desc.lower():
+            return port
+    raise ValueError(f"No valid port found for hint '{hint}'.")
+
+def plotData(data):
+    """Plot the data contained in the given DataFrame."""
+
+    fig, ax = plt.subplots(2, 1)
+    ax[0].plot(data['v'], data['i_kei'], label='Keithley 2400')
+    ax[0].plot(data['v'], data['i_dmm'], label='Keithley DMM 6500')
+    # ax[0].plot(data['v'], data['i_hv'], label='HV port')
+    ax[0].plot(data['v'], data['i_calc'], label='Calculated')
+    ax[0].set_xlabel('Voltage (V)')
+    ax[0].set_ylabel('Current (A)')
+    ax[0].legend()
+    ax[1].plot(data['v'], data['i_kei'] - data['i_calc'], label='Difference KEI')
+    ax[1].plot(data['v'], data['i_dmm'] - data['i_calc'], label='Difference DMM')
+    # ax[1].plot(data['v'], data['i_hv'] - data['i_calc'], label='Difference HV')
+    ax[1].set_xlabel('Voltage (V)')
+    ax[1].set_ylabel('Current difference (A)')
+    ax[1].legend()
+    plt.show()
+
+hints=["VID:PID=CAFE:4001"]
+
+if __name__ == '__main__':
+    try:
+        with Keithley2400(find_device(hint='Prolific')) as kei:
+            with KeithleyDMM6500(find_instr_device(hint='0x05E6::0x6500')) as dmm:
+                with ModuleTestBox(hints=hints, verbose=True) as hv:
+                    print("Connected to Keithley 2400 and HV port.")
+
+                    if not hv.TestConnection(): 
+                        print("HV port not connected.")
+                        exit()
+                    print(f'Firmware: {hv.GetFirmwareVersion()}')
+                    print(f'HV: {"locked" if hv.HV_IsLocked() else "unlocked"}')
+
+                    # perform a voltage ramp measurement with kei and measure current with kei and hv to compare
+                    # and store the results in a pandas DataFrame
+                    nSamples = 90
+                    vStart = 0.0
+                    vStop = 900.0
+
+                    hv.HV_SetAll(0)
+
+                    # configure HV port
+                    hv.SelectChannel(1)
+                    hv.Bias_Enable(False) 
+                    hv.HV_Enable(True)
+
+                    # hv.SetMeanCount(60)
+                    # hv.AdjustScaleI(0) # ppm
+                    # hv.AdjustScaleV(-4512)  # ppm
+
+                    # perform voltage ramp measurement with kei
+                    kei.apply_voltage(compliance_current=1.1e-5)
+                    kei.source_voltage = vStart
+                    kei.enable_source()
+                    # kei.current_nplc = 10
+                    kei.measure_current(10)
+                    kei.current_range = 10e-6
+
+                    dmm.measure_current(max_current=0.000001)
+                    dmm.current_nplc = 12
+
+
+                    values = []
+
+                    print("Starting voltage ramp measurement...")
+                    
+                    for i in range(nSamples):
+                        v = vStart + i * (vStop - vStart) / nSamples
+                        kei.source_voltage = v
+                        sleep(0.1)
+                        i_kei = kei.current
+                        # i_kei = 0
+                        # i_dmm = 0
+                        i_dmm = dmm.current
+                        # i_hv = hv.GetI() * -1e-12
+                        i_hv = 0
+                        
+                        while i_dmm > 1:
+                            i_dmm = dmm.current
+                        # i_calc = v / 100.003e6
+                        # i_calc = v / 5068423720.2
+                        i_calc = v / 102980719.7
+
+                        values.append((v, i_kei, i_dmm, i_hv, i_calc))
+
+                    kei.disable_source()
+                    
+                    data = pd.DataFrame(values, columns=['v', 'i_kei', 'i_dmm', 'i_hv', 'i_calc'])
+                    data['ppm'] = (data['i_calc'] - data['i_hv']) / data['i_calc'] * 1e6
+                    
+                    print(data)
+                    print(hv.GetError())
+
+                    sample_cal = round(nSamples * 0.8)
+                    print(f"Sample for calibration: {data['ppm'].iloc[sample_cal:sample_cal+50].mean()} ppm")
+
+                    # save data to Excel file
+                    data.to_excel('data.xlsx', index=False)
+
+                    plotData(data)
+            
+    except Exception as e:
+        print(f"Error during programm: {e}")
diff --git a/plot.py b/plot.py
new file mode 100644
index 0000000..61ed12a
--- /dev/null
+++ b/plot.py
@@ -0,0 +1,46 @@
+from matplotlib import pyplot as plt
+import numpy as np
+import pandas as pd
+
+
+
+
+
+
+def plotData(data):
+    """Plot the data contained in the given DataFrame."""
+
+    fig, ax = plt.subplots(2, 1)
+    ax[0].plot(data['v'], data['i_dmm'], label='Keithley')
+    ax[0].plot(data['v'], data['i_hv'], label='HV port')
+    ax[0].plot(data['v'], data['i_calc'], label='Calculated')
+    ax[0].set_xlabel('Voltage (V)')
+    ax[0].set_ylabel('Current (1 uA)')
+    ax[0].legend()
+    ax[1].plot(data['v'], data['i_dmm'] - data['i_calc'], label='Difference KEI')
+    ax[1].plot(data['v'], data['i_hv'] - data['i_calc'], label='Difference HV')
+    ax[1].set_xlabel('Voltage (V)')
+    ax[1].grid()
+    ax[1].set_ylabel('Current difference (uA)')
+    ax[1].legend()
+    plt.show()
+
+
+#import excel file 
+data = pd.read_excel('data_biasTEST.xlsx')
+# data['ppm'] = (data['i_kei'] - data['i_hv']) / data['i_kei'] * 1e6
+# sample_cal = round(len(data) * 0.8)
+# print(f"Sample for calibration: {data['ppm'].iloc[sample_cal:sample_cal+20].mean()} ppm")
+
+# linear regression for i_kei
+from sklearn.linear_model import LinearRegression
+X = data['v'].values.reshape(-1, 1)
+y = data['i_hv'].values
+reg = LinearRegression().fit(X, y)
+data['i_calc'] = reg.predict(X)
+print(f"Linear regression: {reg.coef_[0]} A/V")
+print(f"Linear regression: {reg.intercept_} A")
+
+
+print(data)
+plotData(data)
diff --git a/relaistest.py b/relaistest.py
new file mode 100644
index 0000000..5ea38b2
--- /dev/null
+++ b/relaistest.py
@@ -0,0 +1,34 @@
+from ModuleTestBox import ModuleTestBox
+from time import sleep
+
+hints=["VID:PID=CAFE:4001"]
+
+with ModuleTestBox(hints=hints, verbose=True) as hvp:
+    # hvp.SelectADC(1)
+    # hvp.Relais_SetCh(1)
+    # hvp.SelectADC(4)
+    # hvp.Relais_SetCh(1)
+    # hvp.SelectADC(8)
+    # hvp.Relais_SetCh(1)
+    while True:
+        try:
+
+            for x in range(1, 9):
+                hvp.SelectChannel(x)
+                hvp.Bias_Enable(1)
+                hvp.Bias_SetV(0)
+                # sleep(0.1)
+            # sleep(0.1)
+            print(hvp.Bias_GetAll())
+            input("Press enter to turn off Relais")
+            for x in range(1, 9):
+                hvp.SelectChannel(x)
+                hvp.Bias_Enable(0)
+                hvp.Bias_SetV(0)
+                # sleep(0.1)
+
+            print(hvp.Bias_GetAll())
+
+        except KeyboardInterrupt:
+            print("KeyboardInterrupt")
+            break
\ No newline at end of file