Untitled

import csv
import time
from pymeasure.instruments.keithley import Keithley2400

# ---- Connect ----
keithley = Keithley2400(
    "USB0::0x05E6::0x2450::04564746::INSTR",
    write_termination="\n",
    read_termination="\n"
)

# Use rear terminals if that’s how you're wired
keithley.use_front_terminals()

# ---- Configure Source (Voltage) ----
keithley.apply_voltage(voltage_range=2, compliance_current=0.01)
keithley.source_voltage = 1
keithley.enable_source()

# ---- Configure Resistance Measurement ----
keithley.wires = 4              # Use 4-wire if Kelvin leads
keithley.measure_resistance(nplc=1)

# ---- Measurement Loop ----
data = []
print("Starting measurement...")

for i in range(50):
    resistance = keithley.resistance
    voltage = keithley.source_voltage
    timestamp = time.time()

    print(f"{i}: V={voltage:.3f} V  R={resistance:.6f} Ohm")
    data.append([timestamp, voltage, resistance])

# ---- Save to CSV ----
with open("resistance_data.csv", "w", newline="") as f:
    writer = csv.writer(f)
    writer.writerow(["Timestamp", "Voltage (V)", "Resistance (Ohms)"])
    writer.writerows(data)

# ---- Safe Shutdown ----
keithley.shutdown()

print("Done. Data saved to resistance_data.csv")