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Experimento-de-Laboratorio-temperatura
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@ -11,13 +11,15 @@ The image shows the parts that make up the experiment.
| Equipment | Model | Description | Pickture |
|---------|-------------|-------------|----------|
| Digit Multimeter | M3500A | Multimeter used to measure voltage and current | ![](Multimeter.png "Multimeter")
| Digit Multimeter PICOTEST | M3500A | Multimeter used to measure voltage | ![](Multimeter.png "Multimeter")
| Programmable DC Power Supply 0-30 V | PWS4305 | DC supply for powering the Pyrometer | ![](DCPower.png "DCpower")
| System DC Power Supply 150 V / 10 A | N5770A | DC source to heat the metal part | ![](SystemDC.png "SystemDC")
| Pyrometer CTLaser LT | OPTCTLLTSF | Pyrometer, temperature sensor | ![](Pyrometer.png "Pyrometer")
| Hot plate | IKA C-MAG HS7 | Heated bed with temperature control | ![](C-MAG.png "c-mag")
| Digit Multimeter Tektronix | DMM4040 | Multimeter used to measure current | ![](DMM4040.png "DMM4040")
## Communication
### Communication with `Digit Multimeter M3500A` and `System DC Power Supply 150 V / 10 A`
To communicate the `Digit Multimeter M3500A` and the `System DC Power Supply 150 V / 10 A` a USB cable was used through the VISA protocol (Virtual Instrument Software Architecture) which is a standard for configuring, programming and debugging instrumentation systems that include GPIB interfaces. To do this, you first have to download the NI-VISA software on the computer you intend to use since Python is used to communicate through the Python wrapper `pyvisa` which requires the real VISA installation on the system. Otherwise an error will be thrown.
<br>It is installed `pyvisa`:
@ -36,7 +38,7 @@ If a series of codes are displayed in the Terminal, it means the instruments hav
```Terminal
'USB0::0x164E::0x0DAD::TW00013644::INSTR'
```
### Communication with the Optris CTlaser pyrometer
### Communication with the Optris CTlaser pyrometer `OPTCTLLTSF`
Communication with the Optris CTlaser pyrometer was performed using the sensor's native binary protocol, using the Python programming language and the standard `pyserial` library for access to the COM port (virtual USB RS-232).
<br>The sensor protocol consists of sending single-byte binary commands and receiving two-byte encoded responses, representing data such as temperature in `uint16` format.
<br>Libraries used:
@ -60,7 +62,7 @@ This command requests the process temperature (Tprocess). The sensor's response
```python
temperatura = ((byte1 * 256 + byte2) - 1000) / 10
```
All this information was obtained from the manufacturer's manuals which are attached to this repository.
All this information was obtained from the manufacturer's manuals which are attached to this repository. [CTR-commands](https://gitea.itmorelia.com/delfin-25a/Experimento-de-Laboratorio-temperatura/src/branch/main/CTlaser-manual.pdf) and [CTlaser-manual](https://gitea.itmorelia.com/delfin-25a/Experimento-de-Laboratorio-temperatura/src/branch/main/CTlaser-manual.pdf)
#### Minimum code for pyrometer reading
```python
@ -83,150 +85,43 @@ else:
sensor.close()
```
## Code
### Communication with `Digit Multimeter Tektronix DMM4040`
Para poder establecer comunicación entre el multímetro digital **Tektronix DMM4040** y la computadora mediante una interfaz **RS-232**, utilizando Python y la librería **Pyvisa**. La comunicación se realiza por comandos **SCPI** (Standar Commands for Programmable Instruments), ampliamente utilizados en istrumentación electrónica.
<br>Para poder comunicarnos con el multimetro es necesario tener un cable serial RS-232 a USB (adaptador compatible, ejemplo: PL2303, CH340, FTDI) y conectarlo tanto a la salida de datos serial del multimetro digital DMM4040 como a un puerto USB disponible en el computador, también, es necesario tener instalado el software de NI_VISA (Controlador requerido para comunicación serial por PyVISA), Python e instalar la librería `pyvisa`.
#### Código de ejemplo para conectar el multimetro DMM4040 con pyhton
```python
import tkinter as tk
from tkinter import messagebox
import pyvisa
import time
import csv
from datetime import datetime
import os
from decimal import Decimal
import serial
PUERTO = 'COM9' #Puerto COM en donde se encuetra el Pyrometer
BAUDRATE = 115200
COMANDO_TEMPERATURA = bytes([0x01]) # Según protocolo binario del sensor
ID_M3500A = 'USB0::0x164E::0x0DAD::TW00013644::INSTR' #Multimetro
ID_N5770A = 'USB0::0x0957::0x0807::N5770A-US11M7295J::INSTR' #Fuente
# Crear administrador VISA
rm = pyvisa.ResourceManager()
sensor = serial.Serial(
port=PUERTO,
baudrate=BAUDRATE,
bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
timeout=1
)
time.sleep(2)
puerto = 'ASRL16::INSTR' # Asegurarse que este valor coincida con NI MAX
try:
# Conectar al multímetro
m3500a = rm.open_resource(ID_M3500A)
m3500a.write('*RST')
m3500a.write('*CLS')
m3500a.write("CONF:VOLT:DC 100") # Voltaje DC, rango fijo de 100 V
m3500a.write("CONF:CURR:DC 10") # Corriente DC, rango fijo de 10 A
# Conectar a la fuente de poder
fuente = rm.open_resource(ID_N5770A)
fuente.write('*RST')
fuente.write('*CLS')
fuente.write('OUTP ON')
multimetro = rm.open_resource(puerto)
# Configuración de la interfaz RS-232
multimetro.baud_rate = 9600
multimetro.data_bits = 8
multimetro.parity = pyvisa.constants.Parity.none
multimetro.stop_bits = pyvisa.constants.StopBits.one
multimetro.flow_control = pyvisa.constants.ControlFlow.none
multimetro.timeout = 5000
multimetro.write_termination = '\r\n'
multimetro.read_termination = '\r\n'
# Configurar medición de corriente DC (puedes usar VOLT:DC para voltaje)
multimetro.write("*CLS")
multimetro.write("CONF:CURR:DC")
multimetro.write("VOLT:DC:NPLC 1")
multimetro.write("TRIG:SOUR IMM")
multimetro.write("TRIG:DEL 0")
multimetro.write("SAMP:COUN 1")
# Iniciar y obtener la lectura
multimetro.write("INIT")
lectura = multimetro.query("FETCH?")
primera_lectura = lectura.strip().split(',')[0]
print("Corriente medida (DC):", primera_lectura, "A")
except Exception as e:
messagebox.showerror("Error", f"Error en la conexión con los instrumentos:\n{e}")
exit()
directorio = "Mediciones"
os.makedirs(directorio, exist_ok=True)
timestamp = datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
archivo_csv = os.path.join(directorio, f"mediciones_{timestamp}.csv")
with open(archivo_csv, mode='w', newline='') as archivo:
escritor = csv.writer(archivo)
escritor.writerow(["Temperatura","Voltaje Medido (V)", "Corriente Medida (A)","Voltaje fuente","Corriente fuente","Fecha"])
##################################################### Lectura del multimetro
def actualizar_lecturas():
try:
# === Leer temperatura del sensor ===
sensor.write(COMANDO_TEMPERATURA)
time.sleep(0.2)
respuesta = sensor.read(2)
if len(respuesta) == 2:
byte1, byte2 = respuesta[0], respuesta[1]
temperatura = ((byte1 * 256 + byte2) - 1000) / 10
label_temperatura.config(text=f"Temperatura: {temperatura:.1f} °C")
else:
temperatura = None
label_temperatura.config(text="Temperatura: --- °C")
m3500a.write('READ?') # Lectura del multimetro
voltaje = float(m3500a.read().strip())
label_voltaje.config(text=f"Voltaje DC: {voltaje:.3f} V")
fuente.write("VOLT?") # Lectura de la fuente
voltaje_fuente = float(fuente.read().strip())
fuente.write("CURR?")
corriente_fuente = float(fuente.read().strip())
##################################################### Registro en CSV
fecha_actual = datetime.now().strftime("%H:%M:%S")
with open(archivo_csv, mode='a', newline='') as archivo:
escritor = csv.writer(archivo)
escritor.writerow([temperatura ,voltaje, "", voltaje_fuente, corriente_fuente, fecha_actual])
except Exception as e:
label_temperatura.config(text="Temperatura: Error")
label_voltaje.config(text="Voltaje DC: Error")
label_corriente.config(text="Corriente DC: Error")
print(f"Error al leer: {e}")
# Repetir cada 500 ms
ventana.after(500, actualizar_lecturas)
##################################################### Control de fuente
def aplicar_valores_fuente():
try:
v_set = entrada_voltaje.get()
i_set = entrada_corriente.get()
fuente.write(f"VOLT {v_set}")
fuente.write(f"CURR {i_set}")
#messagebox.showinfo("Configuración", "Valores aplicados correctamente.")
except Exception as e:
messagebox.showerror("Error", f"No se pudo configurar la fuente:\n{e}")
##################################################### Window
ventana = tk.Tk()
ventana.title("CONTROL Y MEDICIÓN")
ventana.geometry("300x250")
######## Lecturas
label_temperatura = tk.Label(ventana, text="temperaruta: --- °C", font=("Arial", 14))
label_temperatura.pack(pady=5)
label_voltaje = tk.Label(ventana, text="Voltaje DC: --- V", font=("Arial", 14))
label_voltaje.pack(pady=5)
label_corriente = tk.Label(ventana, text="Corriente DC: --- A", font=("Arial", 14))
label_corriente.pack(pady=5)
######## Control de fuente
frame_fuente = tk.Frame(ventana)
frame_fuente.pack(pady=10)
tk.Label(frame_fuente, text="Voltaje de salida (V):",font=("Arial",14)).grid(row=0, column=0, padx=5, pady=2)
entrada_voltaje = tk.Entry(frame_fuente, width=10)
entrada_voltaje.grid(row=0, column=1)
entrada_voltaje.bind('<Return>', lambda event: aplicar_valores_fuente())
tk.Label(frame_fuente, text="Corriente límite (A):",font=("Arial",14)).grid(row=1, column=0, padx=5, pady=2)
entrada_corriente = tk.Entry(frame_fuente, width=10)
entrada_corriente.grid(row=1, column=1)
entrada_corriente.bind('<Return>', lambda event: aplicar_valores_fuente())
actualizar_lecturas()
ventana.mainloop()
print("Error en la comunicación con el multímetro:", str(e))
```
## Code

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