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prathameshniumprathameshnium
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trying to fix 6517 backend issue
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‎Keithley_6517B/High_Resistance/Backends/IV_K6517B_Simple_Backend_v10.py‎

Lines changed: 98 additions & 94 deletions
Original file line numberDiff line numberDiff line change
@@ -77,97 +77,101 @@ def plot_results(data):
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plt.show()
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# --- Main Execution ---
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keithley = None
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results = []
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try:
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# Get sweep parameters from the user
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start_v, stop_v, steps, delay, filename = get_sweep_parameters()
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voltage_sweep = np.linspace(start_v, stop_v, steps)
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# --- 2. CONNECT TO INSTRUMENT (V5 Logic) ---
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print(f"\nAttempting to connect to instrument at: {VISA_ADDRESS}")
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keithley = Keithley6517B(VISA_ADDRESS)
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print(f"Successfully connected to: {keithley.id}")
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# --- 3. CONFIGURE MEASUREMENT (V5 Logic) ---
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print("\nConfiguring instrument for measurement...")
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keithley.reset()
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# Set the function to resistance to ensure the ammeter is configured for
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# zero correction.
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keithley.measure_resistance()
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# --- 4. PERFORM ZERO CHECK & CORRECTION (Exact V5 Logic) ---
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print("\nStarting zero correction procedure...")
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time.sleep(5)
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print("Step 1: Enabling Zero Check mode...")
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keithley.write(':SYSTem:ZCHeck ON') # type: ignore
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time.sleep(5)
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print("Step 2: Acquiring zero correction value...")
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# keithley.write(':SYSTem:ZCORrect:ACQuire')
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time.sleep(5)
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print("Step 3: Disabling Zero Check mode...")
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keithley.write(':SYSTem:ZCHeck OFF')
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time.sleep(5)
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print("Step 4: Enabling Zero Correction...")
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keithley.write(':SYSTem:ZCORrect ON')
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time.sleep(5)
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print("Zero Correction Complete.")
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# --- 5. SETUP AND PERFORM I-V SWEEP ---
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print(f"\nStarting I-V sweep from {start_v}V to {stop_v}V...")
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keithley.current_nplc = 1 # Set integration rate for noise reduction
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keithley.enable_source()
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with open(filename, 'w', newline='') as f:
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writer = csv.writer(f)
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writer.writerow(
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[f"# Measurement Date: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}"])
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writer.writerow(
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[f"# Sweep Parameters: Start={start_v}V, Stop={stop_v}V, Steps={steps}, Delay={delay}s"])
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writer.writerow(["Timestamp (s)", "Applied Voltage (V)",
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"Measured Current (A)", "Resistance (Ohm)"])
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start_time = time.time()
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for i, voltage in enumerate(voltage_sweep):
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keithley.source_voltage = voltage
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time.sleep(delay)
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resistance = keithley.resistance
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timestamp = time.time() - start_time
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# resistance = keithley.resistance
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current = voltage / resistance if resistance != 0 else float('inf')
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print(
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f"Step {i+1}/{steps}: V={voltage:.3f} V, I={current:.4e} A, R={resistance:.4e} Ω")
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data_point = [
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f"{timestamp:.3f}",
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f"{voltage:.4e}",
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f"{current:.4e}",
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f"{resistance:.4e}"]
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results.append(data_point)
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writer.writerow(data_point)
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print("\n--- I-V Sweep Complete ---")
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print(f"Data saved successfully to '{filename}'")
155-
156-
except VisaIOError:
157-
print("\n[VISA Connection Error]")
158-
print(f"Could not connect to the instrument at '{VISA_ADDRESS}'.")
159-
print("Please check the address, cable connections, and if the instrument is on.")
160-
except ValueError:
161-
print("\n[Input Error] Please enter valid numbers for the sweep parameters.")
162-
except Exception as e:
163-
print(f"\n[An Unexpected Error Occurred] Details: {e}")
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finally:
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# --- 7. SAFELY SHUT DOWN (V5 Logic) ---
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if keithley:
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print("\nShutting down instrument...")
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keithley.shutdown()
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print("Voltage source OFF and instrument is safe.")
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# --- 8. PLOT RESULTS ---
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plot_results(results)
80+
def main():
81+
"""Main function to run the I-V experiment."""
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keithley = None
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results = []
84+
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try:
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# Get sweep parameters from the user
87+
start_v, stop_v, steps, delay, filename = get_user_parameters()
88+
voltage_sweep = np.linspace(start_v, stop_v, steps)
89+
90+
# --- 2. CONNECT TO INSTRUMENT (V5 Logic) ---
91+
print(f"\nAttempting to connect to instrument at: {VISA_ADDRESS}")
92+
keithley = Keithley6517B(VISA_ADDRESS)
93+
print(f"Successfully connected to: {keithley.id}")
94+
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# --- 3. CONFIGURE MEASUREMENT (V5 Logic) ---
96+
print("\nConfiguring instrument for measurement...")
97+
keithley.reset()
98+
# Set the function to resistance to ensure the ammeter is configured for
99+
# zero correction.
100+
keithley.measure_resistance()
101+
102+
# --- 4. PERFORM ZERO CHECK & CORRECTION (Exact V5 Logic) ---
103+
print("\nStarting zero correction procedure...")
104+
time.sleep(5)
105+
print("Step 1: Enabling Zero Check mode...")
106+
keithley.write(':SYSTem:ZCHeck ON') # type: ignore
107+
time.sleep(5)
108+
print("Step 2: Acquiring zero correction value...")
109+
# keithley.write(':SYSTem:ZCORrect:ACQuire')
110+
time.sleep(5)
111+
print("Step 3: Disabling Zero Check mode...")
112+
keithley.write(':SYSTem:ZCHeck OFF')
113+
time.sleep(5)
114+
print("Step 4: Enabling Zero Correction...")
115+
keithley.write(':SYSTem:ZCORrect ON')
116+
time.sleep(5)
117+
print("Zero Correction Complete.")
118+
119+
# --- 5. SETUP AND PERFORM I-V SWEEP ---
120+
print(f"\nStarting I-V sweep from {start_v}V to {stop_v}V...")
121+
keithley.current_nplc = 1 # Set integration rate for noise reduction
122+
123+
keithley.enable_source()
124+
125+
with open(filename, 'w', newline='') as f:
126+
writer = csv.writer(f)
127+
writer.writerow(
128+
[f"# Measurement Date: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}"])
129+
writer.writerow(
130+
[f"# Sweep Parameters: Start={start_v}V, Stop={stop_v}V, Steps={steps}, Delay={delay}s"])
131+
writer.writerow(["Timestamp (s)", "Applied Voltage (V)",
132+
"Measured Current (A)", "Resistance (Ohm)"])
133+
134+
start_time = time.time()
135+
for i, voltage in enumerate(voltage_sweep):
136+
keithley.source_voltage = voltage
137+
time.sleep(delay)
138+
resistance = keithley.resistance
139+
timestamp = time.time() - start_time
140+
current = voltage / resistance if resistance != 0 else float('inf')
141+
142+
print(
143+
f"Step {i+1}/{steps}: V={voltage:.3f} V, I={current:.4e} A, R={resistance:.4e} Ω")
144+
145+
data_point = [
146+
f"{timestamp:.3f}",
147+
f"{voltage:.4e}",
148+
f"{current:.4e}",
149+
f"{resistance:.4e}"]
150+
results.append(data_point)
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writer.writerow(data_point)
152+
153+
print("\n--- I-V Sweep Complete ---")
154+
print(f"Data saved successfully to '{filename}'")
155+
156+
except VisaIOError:
157+
print("\n[VISA Connection Error]")
158+
print(f"Could not connect to the instrument at '{VISA_ADDRESS}'.")
159+
print("Please check the address, cable connections, and if the instrument is on.")
160+
except ValueError:
161+
print("\n[Input Error] Please enter valid numbers for the sweep parameters.")
162+
except Exception as e:
163+
print(f"\n[An Unexpected Error Occurred] Details: {e}")
164+
165+
finally:
166+
# --- 7. SAFELY SHUT DOWN (V5 Logic) ---
167+
if keithley:
168+
print("\nShutting down instrument...")
169+
keithley.shutdown()
170+
print("Voltage source OFF and instrument is safe.")
171+
172+
# --- 8. PLOT RESULTS ---
173+
plot_results(results)
174+
175+
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if __name__ == "__main__":
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main()

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