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"""
Module: GW INSTEK GPP-250-4.5 power supply unit control
Description: This module provides a class to interface with the GW INSTEK GPP250-4.5 power
supply unit (PSU) using pyvisa for setting current and voltage on the PSU
Author: Mykhailo Vorobiov
Email: mvorobiov@wm.edu
Date: 2024-10-02
Update: 2024-11-05
"""
from qolab.hardware.power_supply._basic import PowerSupplySCPI
import pyvisa
class PSW25045(PowerSupplySCPI):
"""
A class for interfacing with GW INSTEK GPP250-4.5
signle channel power supply unit.
"""
def __init__(self, resource, *args, **kwds):
"""
Initialize the PSU class.
"""
super().__init__(resource, *args, **kwds)
self.resource = resource
self.config["Device model"] = "GWInstek PSW 250-4.5"
self.numberOfChannels = 2
self.deviceProperties.update({"OpMode"})
self.resource.read_termination = "\n"
self.MAX_CURRENT = 4.5 # Amp
self.MAX_VOLTAGE = 250.0 # Volt
self.enable_output(False)
def get_idn(self):
"""
Query the identification of the instrument.
:return: Identifier string if query is successful or None otherwise.
"""
try:
return self.query('*IDN?').strip()
except pyvisa.VisaIOError as e:
print(f'[ERROR!] Error retrieving identification: {e}')
return None
def get_current_meas(self):
"""
Query the current reading of the instrument.
:return: Current reading in amps as float number and None if error occurs.
"""
try:
return float(self.query('MEAS:CURR?'))
except pyvisa.VisaIOError as e:
print(f"[ERROR!] Error querying the current reading: {e}")
return None
def get_voltage_meas(self):
"""
Query the voltage reading of the instrument.
:return: Voltage reading in volts as float number and None if error occurs.
"""
try:
return float(self.query('MEAS:VOLT?'))
except pyvisa.VisaIOError as e:
print(f"[ERROR!] Error querying the voltage reading: {e}")
return None
def get_power_meas(self):
"""
Query the power reading of the instrument.
:return: Power reading in watts as float number and None if error occurs.
"""
try:
return float(self.query('MEAS:POWE?'))
except pyvisa.VisaIOError as e:
print(f"[ERROR!] Error querying the power reading: {e}")
return None
def set_current(self, current):
"""
Set the target current output of the instrument.
"""
if current <= self.MAX_CURRENT and current >= 0.0:
try:
self.write(f'SOUR:CURR {current}')
print(f"Current is set to {current} V")
except pyvisa.VisaIOError as e:
print(f"[ERROR!] Error setting the current target output: {e}")
else:
print(f"[WARNING] Target current must be between 0 and {self.MAX_CURRENT} Amps."
f"\n\tThe traget current left unchanged.")
def set_voltage(self, voltage):
"""
Set the target voltage output of the instrument.
"""
if voltage <= self.MAX_VOLTAGE and voltage >= 0.0:
try:
self.write(f'SOUR:VOLT {voltage}')
print(f"[INFO] Voltage is set to {voltage} V")
except pyvisa.VisaIOError as e:
print(f"[ERROR!] Error setting the voltage target output: {e}")
else:
print(f"[WARNING] Target voltage must be between 0 and {self.MAX_VOLTAGE} Volts."
f"\n\tThe traget voltage left unchanged.")
def enable_output(self, output_state=False):
"""
Set the output state of the instrument ON or OFF.
:param output_state: Boolean flag. Sets the output ON if 'True' or OFF if 'False'.
"""
self.output_state = output_state # This is here to define out state (need some work on it)
try:
if self.output_state:
self.write(f'OUTP:STAT 1')
self.output_state = output_state
print(f"[INFO] Output is ON")
else:
self.write(f'OUTP:STAT 0')
self.output_state = not(output_state)
print(f"[INFO] Output is OFF")
except pyvisa.VisaIOError as e:
print(f"[ERROR!] Error toggle the output: {e}")
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