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Calibration.py
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# NanoVNASaver - a python program to view and export Touchstone data from a NanoVNA
# Copyright (C) 2019. Rune B. Broberg
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
import logging
import math
import os
from typing import List
import numpy as np
from PyQt5 import QtWidgets, QtCore
from .RFTools import Datapoint
logger = logging.getLogger(__name__)
class CalibrationWindow(QtWidgets.QWidget):
nextStep = -1
def __init__(self, app):
super().__init__()
from .NanoVNASaver import NanoVNASaver
self.app: NanoVNASaver = app
self.setMinimumWidth(450)
self.setWindowTitle("Calibration")
self.setWindowIcon(self.app.icon)
self.setSizePolicy(QtWidgets.QSizePolicy.MinimumExpanding, QtWidgets.QSizePolicy.MinimumExpanding)
shortcut = QtWidgets.QShortcut(QtCore.Qt.Key_Escape, self, self.hide)
top_layout = QtWidgets.QHBoxLayout()
left_layout = QtWidgets.QVBoxLayout()
right_layout = QtWidgets.QVBoxLayout()
top_layout.addLayout(left_layout)
top_layout.addLayout(right_layout)
self.setLayout(top_layout)
calibration_status_group = QtWidgets.QGroupBox("Active calibration")
calibration_status_layout = QtWidgets.QFormLayout()
self.calibration_status_label = QtWidgets.QLabel("Device calibration")
self.calibration_source_label = QtWidgets.QLabel("NanoVNA")
calibration_status_layout.addRow("Calibration:", self.calibration_status_label)
calibration_status_layout.addRow("Source:", self.calibration_source_label)
calibration_status_group.setLayout(calibration_status_layout)
left_layout.addWidget(calibration_status_group)
calibration_control_group = QtWidgets.QGroupBox("Calibrate")
calibration_control_layout = QtWidgets.QFormLayout(calibration_control_group)
btn_cal_short = QtWidgets.QPushButton("Short")
btn_cal_short.clicked.connect(self.manualSaveShort)
self.cal_short_label = QtWidgets.QLabel("Uncalibrated")
btn_cal_open = QtWidgets.QPushButton("Open")
btn_cal_open.clicked.connect(self.manualSaveOpen)
self.cal_open_label = QtWidgets.QLabel("Uncalibrated")
btn_cal_load = QtWidgets.QPushButton("Load")
btn_cal_load.clicked.connect(self.manualSaveLoad)
self.cal_load_label = QtWidgets.QLabel("Uncalibrated")
btn_cal_through = QtWidgets.QPushButton("Through")
btn_cal_through.clicked.connect(self.manualSaveThrough)
# btn_cal_through.setDisabled(True)
self.cal_through_label = QtWidgets.QLabel("Uncalibrated")
btn_cal_isolation = QtWidgets.QPushButton("Isolation")
btn_cal_isolation.clicked.connect(self.manualSaveIsolation)
# btn_cal_isolation.setDisabled(True)
self.cal_isolation_label = QtWidgets.QLabel("Uncalibrated")
self.input_offset_delay = QtWidgets.QDoubleSpinBox()
self.input_offset_delay.setValue(0)
self.input_offset_delay.setSuffix(" ps")
self.input_offset_delay.setAlignment(QtCore.Qt.AlignRight)
self.input_offset_delay.valueChanged.connect(self.setOffsetDelay)
self.input_offset_delay.setRange(-10e6, 10e6)
calibration_control_layout.addRow(btn_cal_short, self.cal_short_label)
calibration_control_layout.addRow(btn_cal_open, self.cal_open_label)
calibration_control_layout.addRow(btn_cal_load, self.cal_load_label)
calibration_control_layout.addRow(btn_cal_isolation, self.cal_isolation_label)
calibration_control_layout.addRow(btn_cal_through, self.cal_through_label)
calibration_control_layout.addRow(QtWidgets.QLabel(""))
calibration_control_layout.addRow("Offset delay", self.input_offset_delay)
self.btn_automatic = QtWidgets.QPushButton("Calibration assistant")
calibration_control_layout.addRow(self.btn_automatic)
self.btn_automatic.clicked.connect(self.automaticCalibration)
apply_reset_layout = QtWidgets.QHBoxLayout()
btn_apply = QtWidgets.QPushButton("Apply")
btn_apply.clicked.connect(self.calculate)
btn_reset = QtWidgets.QPushButton("Reset")
btn_reset.clicked.connect(self.reset)
apply_reset_layout.addWidget(btn_apply)
apply_reset_layout.addWidget(btn_reset)
calibration_control_layout.addRow(apply_reset_layout)
left_layout.addWidget(calibration_control_group)
calibration_notes_group = QtWidgets.QGroupBox("Notes")
calibration_notes_layout = QtWidgets.QVBoxLayout(calibration_notes_group)
self.notes_textedit = QtWidgets.QPlainTextEdit()
calibration_notes_layout.addWidget(self.notes_textedit)
left_layout.addWidget(calibration_notes_group)
file_box = QtWidgets.QGroupBox("Files")
file_layout = QtWidgets.QFormLayout(file_box)
btn_save_file = QtWidgets.QPushButton("Save calibration")
btn_save_file.clicked.connect(lambda: self.saveCalibration())
btn_load_file = QtWidgets.QPushButton("Load calibration")
btn_load_file.clicked.connect(lambda: self.loadCalibration())
save_load_layout = QtWidgets.QHBoxLayout()
save_load_layout.addWidget(btn_save_file)
save_load_layout.addWidget(btn_load_file)
file_layout.addRow(save_load_layout)
left_layout.addWidget(file_box)
cal_standard_box = QtWidgets.QGroupBox("Calibration standards")
cal_standard_layout = QtWidgets.QFormLayout(cal_standard_box)
self.use_ideal_values = QtWidgets.QCheckBox("Use ideal values")
self.use_ideal_values.setChecked(True)
self.use_ideal_values.stateChanged.connect(self.idealCheckboxChanged)
cal_standard_layout.addRow(self.use_ideal_values)
self.cal_short_box = QtWidgets.QGroupBox("Short")
cal_short_form = QtWidgets.QFormLayout(self.cal_short_box)
self.cal_short_box.setDisabled(True)
self.short_l0_input = QtWidgets.QLineEdit("0")
self.short_l1_input = QtWidgets.QLineEdit("0")
self.short_l2_input = QtWidgets.QLineEdit("0")
self.short_l3_input = QtWidgets.QLineEdit("0")
self.short_length = QtWidgets.QLineEdit("0")
cal_short_form.addRow("L0 (H(e-12))", self.short_l0_input)
cal_short_form.addRow("L1 (H(e-24))", self.short_l1_input)
cal_short_form.addRow("L2 (H(e-33))", self.short_l2_input)
cal_short_form.addRow("L3 (H(e-42))", self.short_l3_input)
cal_short_form.addRow("Offset Delay (ps)", self.short_length)
self.cal_open_box = QtWidgets.QGroupBox("Open")
cal_open_form = QtWidgets.QFormLayout(self.cal_open_box)
self.cal_open_box.setDisabled(True)
self.open_c0_input = QtWidgets.QLineEdit("50")
self.open_c1_input = QtWidgets.QLineEdit("0")
self.open_c2_input = QtWidgets.QLineEdit("0")
self.open_c3_input = QtWidgets.QLineEdit("0")
self.open_length = QtWidgets.QLineEdit("0")
cal_open_form.addRow("C0 (F(e-15))", self.open_c0_input)
cal_open_form.addRow("C1 (F(e-27))", self.open_c1_input)
cal_open_form.addRow("C2 (F(e-36))", self.open_c2_input)
cal_open_form.addRow("C3 (F(e-45))", self.open_c3_input)
cal_open_form.addRow("Offset Delay (ps)", self.open_length)
self.cal_load_box = QtWidgets.QGroupBox("Load")
cal_load_form = QtWidgets.QFormLayout(self.cal_load_box)
self.cal_load_box.setDisabled(True)
self.load_resistance = QtWidgets.QLineEdit("50")
self.load_inductance = QtWidgets.QLineEdit("0")
# self.load_capacitance = QtWidgets.QLineEdit("0")
# self.load_capacitance.setDisabled(True) # Not yet implemented
self.load_length = QtWidgets.QLineEdit("0")
cal_load_form.addRow("Resistance (\N{OHM SIGN})", self.load_resistance)
cal_load_form.addRow("Inductance (H(e-12))", self.load_inductance)
# cal_load_form.addRow("Capacitance (F(e-12))", self.load_capacitance)
cal_load_form.addRow("Offset Delay (ps)", self.load_length)
self.cal_through_box = QtWidgets.QGroupBox("Through")
cal_through_form = QtWidgets.QFormLayout(self.cal_through_box)
self.cal_through_box.setDisabled(True)
self.through_length = QtWidgets.QLineEdit("0")
cal_through_form.addRow("Offset Delay (ps)", self.through_length)
cal_standard_layout.addWidget(self.cal_short_box)
cal_standard_layout.addWidget(self.cal_open_box)
cal_standard_layout.addWidget(self.cal_load_box)
cal_standard_layout.addWidget(self.cal_through_box)
self.cal_standard_save_box = QtWidgets.QGroupBox("Saved settings")
cal_standard_save_layout = QtWidgets.QVBoxLayout(self.cal_standard_save_box)
self.cal_standard_save_box.setDisabled(True)
self.cal_standard_save_selector = QtWidgets.QComboBox()
self.listCalibrationStandards()
cal_standard_save_layout.addWidget(self.cal_standard_save_selector)
cal_standard_save_button_layout = QtWidgets.QHBoxLayout()
btn_save_standard = QtWidgets.QPushButton("Save")
btn_save_standard.clicked.connect(self.saveCalibrationStandard)
btn_load_standard = QtWidgets.QPushButton("Load")
btn_load_standard.clicked.connect(self.loadCalibrationStandard)
btn_delete_standard = QtWidgets.QPushButton("Delete")
btn_delete_standard.clicked.connect(self.deleteCalibrationStandard)
cal_standard_save_button_layout.addWidget(btn_load_standard)
cal_standard_save_button_layout.addWidget(btn_save_standard)
cal_standard_save_button_layout.addWidget(btn_delete_standard)
cal_standard_save_layout.addLayout(cal_standard_save_button_layout)
cal_standard_layout.addWidget(self.cal_standard_save_box)
right_layout.addWidget(cal_standard_box)
def checkExpertUser(self):
if not self.app.settings.value("ExpertCalibrationUser", False, bool):
response = QtWidgets.QMessageBox.question(self, "Are you sure?", "Use of the manual calibration buttons " +
"is non-intuitive, and primarily suited for users with very " +
"specialized needs. The buttons do not sweep for you, nor do " +
"they interact with the NanoVNA calibration.\n\n" +
"If you are trying to do a calibration of the NanoVNA, do so " +
"on the device itself instead. If you are trying to do a " +
"calibration with NanoVNA-Saver, use the Calibration Assistant " +
"if possible.\n\n" +
"If you are certain you know what you are doing, click Yes.",
QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.Cancel,
QtWidgets.QMessageBox.Cancel)
if response == QtWidgets.QMessageBox.Yes:
self.app.settings.setValue("ExpertCalibrationUser", True)
return True
else:
return False
else:
return True
def manualSaveShort(self):
if self.checkExpertUser():
self.saveShort()
def saveShort(self):
self.app.calibration.s11short = self.app.data
self.cal_short_label.setText("Data set (" + str(len(self.app.calibration.s11short)) + " points)")
def manualSaveOpen(self):
if self.checkExpertUser():
self.saveOpen()
def saveOpen(self):
self.app.calibration.s11open = self.app.data
self.cal_open_label.setText("Data set (" + str(len(self.app.calibration.s11open)) + " points)")
def manualSaveLoad(self):
if self.checkExpertUser():
self.saveLoad()
def saveLoad(self):
self.app.calibration.s11load = self.app.data
self.cal_load_label.setText("Data set (" + str(len(self.app.calibration.s11load)) + " points)")
def manualSaveIsolation(self):
if self.checkExpertUser():
self.saveIsolation()
def saveIsolation(self):
self.app.calibration.s21isolation = self.app.data21
self.cal_isolation_label.setText("Data set (" + str(len(self.app.calibration.s21isolation)) + " points)")
def manualSaveThrough(self):
if self.checkExpertUser():
self.saveThrough()
def saveThrough(self):
self.app.calibration.s21through = self.app.data21
self.cal_through_label.setText("Data set (" + str(len(self.app.calibration.s21through)) + " points)")
def listCalibrationStandards(self):
self.cal_standard_save_selector.clear()
num_standards = self.app.settings.beginReadArray("CalibrationStandards")
for i in range(num_standards):
self.app.settings.setArrayIndex(i)
name = self.app.settings.value("Name", defaultValue="INVALID NAME")
self.cal_standard_save_selector.addItem(name, userData=i)
self.app.settings.endArray()
self.cal_standard_save_selector.addItem("New", userData=-1)
self.cal_standard_save_selector.setCurrentText("New")
def saveCalibrationStandard(self):
num_standards = self.app.settings.beginReadArray("CalibrationStandards")
self.app.settings.endArray()
if self.cal_standard_save_selector.currentData() == -1:
# New cal standard
# Get a name
name, selected = QtWidgets.QInputDialog.getText(self, "Calibration standard name", "Enter name to save as")
if not selected or not name:
return
write_num = num_standards
num_standards += 1
else:
write_num = self.cal_standard_save_selector.currentData()
name = self.cal_standard_save_selector.currentText()
self.app.settings.beginWriteArray("CalibrationStandards", num_standards)
self.app.settings.setArrayIndex(write_num)
self.app.settings.setValue("Name", name)
self.app.settings.setValue("ShortL0", self.short_l0_input.text())
self.app.settings.setValue("ShortL1", self.short_l1_input.text())
self.app.settings.setValue("ShortL2", self.short_l2_input.text())
self.app.settings.setValue("ShortL3", self.short_l3_input.text())
self.app.settings.setValue("ShortDelay", self.short_length.text())
self.app.settings.setValue("OpenC0", self.open_c0_input.text())
self.app.settings.setValue("OpenC1", self.open_c1_input.text())
self.app.settings.setValue("OpenC2", self.open_c2_input.text())
self.app.settings.setValue("OpenC3", self.open_c3_input.text())
self.app.settings.setValue("OpenDelay", self.open_length.text())
self.app.settings.setValue("LoadR", self.load_resistance.text())
self.app.settings.setValue("LoadL", self.load_inductance.text())
# self.app.settings.setValue("LoadC", self.load_capacitance.text())
self.app.settings.setValue("LoadDelay", self.load_length.text())
self.app.settings.setValue("ThroughDelay", self.through_length.text())
self.app.settings.endArray()
self.app.settings.sync()
self.listCalibrationStandards()
self.cal_standard_save_selector.setCurrentText(name)
def loadCalibrationStandard(self):
if self.cal_standard_save_selector.currentData() == -1:
return
read_num = self.cal_standard_save_selector.currentData()
logger.debug("Loading calibration no %d", read_num)
self.app.settings.beginReadArray("CalibrationStandards")
self.app.settings.setArrayIndex(read_num)
name = self.app.settings.value("Name")
logger.info("Loading: %s", name)
self.short_l0_input.setText(str(self.app.settings.value("ShortL0", 0)))
self.short_l1_input.setText(str(self.app.settings.value("ShortL1", 0)))
self.short_l2_input.setText(str(self.app.settings.value("ShortL2", 0)))
self.short_l3_input.setText(str(self.app.settings.value("ShortL3", 0)))
self.short_length.setText(str(self.app.settings.value("ShortDelay", 0)))
self.open_c0_input.setText(str(self.app.settings.value("OpenC0", 50)))
self.open_c1_input.setText(str(self.app.settings.value("OpenC1", 0)))
self.open_c2_input.setText(str(self.app.settings.value("OpenC2", 0)))
self.open_c3_input.setText(str(self.app.settings.value("OpenC3", 0)))
self.open_length.setText(str(self.app.settings.value("OpenDelay", 0)))
self.load_resistance.setText(str(self.app.settings.value("LoadR", 50)))
self.load_inductance.setText(str(self.app.settings.value("LoadL", 0)))
# self.load_capacitance.setText(str(self.app.settings.value("LoadC", 0)))
self.load_length.setText(str(self.app.settings.value("LoadDelay", 0)))
self.through_length.setText(str(self.app.settings.value("ThroughDelay", 0)))
self.app.settings.endArray()
def deleteCalibrationStandard(self):
if self.cal_standard_save_selector.currentData() == -1:
return
delete_num = self.cal_standard_save_selector.currentData()
logger.debug("Deleting calibration no %d", delete_num)
num_standards = self.app.settings.beginReadArray("CalibrationStandards")
self.app.settings.endArray()
logger.debug("Number of standards known: %d", num_standards)
if num_standards == 1:
logger.debug("Only one standard known")
self.app.settings.beginWriteArray("CalibrationStandards", 0)
self.app.settings.endArray()
else:
names = []
shortL0 = []
shortL1 = []
shortL2 = []
shortL3 = []
shortDelay = []
openC0 = []
openC1 = []
openC2 = []
openC3 = []
openDelay = []
loadR = []
loadL = []
loadC = []
loadDelay = []
throughDelay = []
self.app.settings.beginReadArray("CalibrationStandards")
for i in range(num_standards):
if i == delete_num:
continue
self.app.settings.setArrayIndex(i)
names.append(self.app.settings.value("Name"))
shortL0.append(self.app.settings.value("ShortL0"))
shortL1.append(self.app.settings.value("ShortL1"))
shortL2.append(self.app.settings.value("ShortL2"))
shortL3.append(self.app.settings.value("ShortL3"))
shortDelay.append(self.app.settings.value("ShortDelay"))
openC0.append(self.app.settings.value("OpenC0"))
openC1.append(self.app.settings.value("OpenC1"))
openC2.append(self.app.settings.value("OpenC2"))
openC3.append(self.app.settings.value("OpenC3"))
openDelay.append(self.app.settings.value("OpenDelay"))
loadR.append(self.app.settings.value("LoadR"))
loadL.append(self.app.settings.value("LoadL"))
loadC.append(self.app.settings.value("LoadC"))
loadDelay.append(self.app.settings.value("LoadDelay"))
throughDelay.append(self.app.settings.value("ThroughDelay"))
self.app.settings.endArray()
self.app.settings.beginWriteArray("CalibrationStandards")
self.app.settings.remove("")
self.app.settings.endArray()
self.app.settings.beginWriteArray("CalibrationStandards", len(names))
for i in range(len(names)):
self.app.settings.setArrayIndex(i)
self.app.settings.setValue("Name", names[i])
self.app.settings.setValue("ShortL0", shortL0[i])
self.app.settings.setValue("ShortL1", shortL1[i])
self.app.settings.setValue("ShortL2", shortL2[i])
self.app.settings.setValue("ShortL3", shortL3[i])
self.app.settings.setValue("ShortDelay", shortDelay[i])
self.app.settings.setValue("OpenC0", openC0[i])
self.app.settings.setValue("OpenC1", openC1[i])
self.app.settings.setValue("OpenC2", openC2[i])
self.app.settings.setValue("OpenC3", openC3[i])
self.app.settings.setValue("OpenDelay", openDelay[i])
self.app.settings.setValue("LoadR", loadR[i])
self.app.settings.setValue("LoadL", loadL[i])
self.app.settings.setValue("LoadC", loadC[i])
self.app.settings.setValue("LoadDelay", loadDelay[i])
self.app.settings.setValue("ThroughDelay", throughDelay[i])
self.app.settings.endArray()
self.app.settings.sync()
self.listCalibrationStandards()
def reset(self):
self.app.calibration = Calibration()
self.cal_short_label.setText("Uncalibrated")
self.cal_open_label.setText("Uncalibrated")
self.cal_load_label.setText("Uncalibrated")
self.cal_through_label.setText("Uncalibrated")
self.cal_isolation_label.setText("Uncalibrated")
self.calibration_status_label.setText("Device calibration")
self.calibration_source_label.setText("Device")
self.notes_textedit.clear()
if len(self.app.worker.rawData11) > 0:
# There's raw data, so we can get corrected data
logger.debug("Saving and displaying raw data.")
self.app.saveData(self.app.worker.rawData11, self.app.worker.rawData21, self.app.sweepSource)
self.app.worker.signals.updated.emit()
def setOffsetDelay(self, value: float):
logger.debug("New offset delay value: %f ps", value)
self.app.worker.offsetDelay = value / 1e12
if len(self.app.worker.rawData11) > 0:
# There's raw data, so we can get corrected data
logger.debug("Applying new offset to existing sweep data.")
self.app.worker.data11, self.app.worker.data21 = self.app.worker.applyCalibration(self.app.worker.rawData11,
self.app.worker.rawData21)
logger.debug("Saving and displaying corrected data.")
self.app.saveData(self.app.worker.data11, self.app.worker.data21, self.app.sweepSource)
self.app.worker.signals.updated.emit()
def calculate(self):
if self.app.btnStopSweep.isEnabled():
# Currently sweeping
self.app.showError("Unable to apply calibration while a sweep is running. " +
"Please stop the sweep and try again.")
return
if self.use_ideal_values.isChecked():
self.app.calibration.useIdealShort = True
self.app.calibration.useIdealOpen = True
self.app.calibration.useIdealLoad = True
self.app.calibration.useIdealThrough = True
else:
# We are using custom calibration standards
try:
self.app.calibration.shortL0 = self.getFloatValue(self.short_l0_input.text())/10**12
self.app.calibration.shortL1 = self.getFloatValue(self.short_l1_input.text())/10**24
self.app.calibration.shortL2 = self.getFloatValue(self.short_l2_input.text())/10**33
self.app.calibration.shortL3 = self.getFloatValue(self.short_l3_input.text())/10**42
self.app.calibration.shortLength = self.getFloatValue(self.short_length.text())/10**12
self.app.calibration.useIdealShort = False
except ValueError:
self.app.calibration.useIdealShort = True
logger.warning("Invalid data for \"short\" calibration standard. Using ideal values.")
try:
self.app.calibration.openC0 = self.getFloatValue(self.open_c0_input.text())/10**15
if self.app.calibration.openC0 == 0:
raise ValueError("C0 cannot be 0.")
self.app.calibration.openC1 = self.getFloatValue(self.open_c1_input.text())/10**27
self.app.calibration.openC2 = self.getFloatValue(self.open_c2_input.text())/10**36
self.app.calibration.openC3 = self.getFloatValue(self.open_c3_input.text())/10**45
self.app.calibration.openLength = self.getFloatValue(self.open_length.text())/10**12
self.app.calibration.useIdealOpen = False
except ValueError:
self.app.calibration.useIdealOpen = True
logger.warning("Invalid data for \"open\" calibration standard. Using ideal values.")
try:
self.app.calibration.loadR = self.getFloatValue(self.load_resistance.text())
self.app.calibration.loadL = self.getFloatValue(self.load_inductance.text())/10**12
# self.app.calibration.loadC = self.getFloatValue(self.load_capacitance.text()) / 10 ** 12
self.app.calibration.loadLength = self.getFloatValue(self.load_length.text())/10**12
self.app.calibration.useIdealLoad = False
except ValueError:
self.app.calibration.useIdealLoad = True
logger.warning("Invalid data for \"load\" calibration standard. Using ideal values.")
try:
self.app.calibration.throughLength = self.getFloatValue(self.through_length.text())/10**12
self.app.calibration.useIdealThrough = False
except ValueError:
self.app.calibration.useIdealThrough = True
logger.warning("Invalid data for \"through\" calibration standard. Using ideal values.")
logger.debug("Attempting calibration calculation.")
valid, error = self.app.calibration.calculateCorrections()
if valid:
self.calibration_status_label.setText("Application calibration (" +
str(len(self.app.calibration.s11short)) + " points)")
if self.use_ideal_values.isChecked():
self.calibration_source_label.setText(self.app.calibration.source)
else:
self.calibration_source_label.setText(self.app.calibration.source + " (Standards: Custom)")
if len(self.app.worker.rawData11) > 0:
# There's raw data, so we can get corrected data
logger.debug("Applying calibration to existing sweep data.")
self.app.worker.data11, self.app.worker.data21 = self.app.worker.applyCalibration(
self.app.worker.rawData11, self.app.worker.rawData21)
logger.debug("Saving and displaying corrected data.")
self.app.saveData(self.app.worker.data11, self.app.worker.data21, self.app.sweepSource)
self.app.worker.signals.updated.emit()
else:
# showError here hides the calibration window, so we need to pop up our own
QtWidgets.QMessageBox.warning(self, "Error applying calibration", error)
self.calibration_status_label.setText("Applying calibration failed.")
self.calibration_source_label.setText(self.app.calibration.source)
@staticmethod
def getFloatValue(text: str) -> float:
if text == "":
# Default value is float
return 0
return float(text)
def loadCalibration(self):
filename, _ = QtWidgets.QFileDialog.getOpenFileName(filter="Calibration Files (*.cal);;All files (*.*)")
if filename:
self.app.calibration.loadCalibration(filename)
if self.app.calibration.isValid1Port():
self.cal_short_label.setText("Loaded (" + str(len(self.app.calibration.s11short)) + ")")
self.cal_open_label.setText("Loaded (" + str(len(self.app.calibration.s11open)) + ")")
self.cal_load_label.setText("Loaded (" + str(len(self.app.calibration.s11load)) + ")")
if self.app.calibration.isValid2Port():
self.cal_through_label.setText("Loaded (" + str(len(self.app.calibration.s21through)) + ")")
self.cal_isolation_label.setText("Loaded (" + str(len(self.app.calibration.s21isolation)) + ")")
self.calculate()
self.notes_textedit.clear()
for note in self.app.calibration.notes:
self.notes_textedit.appendPlainText(note)
self.app.settings.setValue("CalibrationFile", filename)
def saveCalibration(self):
if not self.app.calibration.isCalculated:
logger.debug("Attempted to save an uncalculated calibration.")
self.app.showError("Cannot save an unapplied calibration state.")
return
filedialog = QtWidgets.QFileDialog(self)
filedialog.setDefaultSuffix("cal")
filedialog.setNameFilter("Calibration Files (*.cal);;All files (*.*)")
filedialog.setAcceptMode(QtWidgets.QFileDialog.AcceptSave)
selected = filedialog.exec()
if selected:
filename = filedialog.selectedFiles()[0]
else:
return
if filename == "":
logger.debug("No file name selected.")
return
self.app.calibration.notes = self.notes_textedit.toPlainText().splitlines()
if filename and self.app.calibration.saveCalibration(filename):
self.app.settings.setValue("CalibrationFile", filename)
else:
logger.error("Calibration save failed!")
self.app.showError("Calibration save failed.")
def idealCheckboxChanged(self):
self.cal_short_box.setDisabled(self.use_ideal_values.isChecked())
self.cal_open_box.setDisabled(self.use_ideal_values.isChecked())
self.cal_load_box.setDisabled(self.use_ideal_values.isChecked())
self.cal_through_box.setDisabled(self.use_ideal_values.isChecked())
self.cal_standard_save_box.setDisabled(self.use_ideal_values.isChecked())
def automaticCalibration(self):
self.btn_automatic.setDisabled(True)
introduction = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information,
"Calibration assistant",
"This calibration assistant will help you create a calibration in the " +
"NanoVNASaver application. It will sweep the standards for you, and "+
"guide you through the process.<br><br>" +
"Before starting, ensure you have Open, Short and Load standards " +
"available, and the cables you wish to have calibrated with the device " +
"connected.<br><br>" +
"If you want a 2-port calibration, also have a \"through\" connector " +
"to hand.<br><br>" +
"<b>The best results are achieved by having the NanoVNA calibrated " +
"on-device for the full span of interest and saved to save slot 0 " +
"before starting.</b><br><br>" +
"Once you are ready to proceed, press Ok",
QtWidgets.QMessageBox.Ok | QtWidgets.QMessageBox.Cancel)
response = introduction.exec()
if response != QtWidgets.QMessageBox.Ok:
self.btn_automatic.setDisabled(False)
return
logger.info("Starting automatic calibration assistant.")
if not self.app.serial.is_open:
QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information, "NanoVNA not connected",
"Please ensure the NanoVNA is connected before attempting calibration.").exec()
self.btn_automatic.setDisabled(False)
return
if self.app.sweepSettingsWindow.continuous_sweep_radiobutton.isChecked():
QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information, "Continuous sweep enabled",
"Please disable continuous sweeping before attempting calibration.").exec()
self.btn_automatic.setDisabled(False)
return
short_step = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information,
"Calibrate short",
"Please connect the \"short\" standard to port 0 of the NanoVNA.\n\n" +
"Press Ok when you are ready to continue.",
QtWidgets.QMessageBox.Ok | QtWidgets.QMessageBox.Cancel)
response = short_step.exec()
if response != QtWidgets.QMessageBox.Ok:
self.btn_automatic.setDisabled(False)
return
self.reset()
self.app.calibration.source = "Calibration assistant"
self.nextStep = 0
self.app.worker.signals.finished.connect(self.automaticCalibrationStep)
self.app.sweep()
return
def automaticCalibrationStep(self):
if self.nextStep == -1:
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
if self.nextStep == 0:
# Short
self.saveShort()
self.nextStep = 1
open_step = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information,
"Calibrate open",
"Please connect the \"open\" standard to port 0 of the NanoVNA.\n\n" +
"Either use a supplied open, or leave the end of the cable unconnected " +
"if desired.\n\n" +
"Press Ok when you are ready to continue.",
QtWidgets.QMessageBox.Ok | QtWidgets.QMessageBox.Cancel)
response = open_step.exec()
if response != QtWidgets.QMessageBox.Ok:
self.nextStep = -1
self.btn_automatic.setDisabled(False)
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
return
else:
self.app.sweep()
return
elif self.nextStep == 1:
# Open
self.saveOpen()
self.nextStep = 2
load_step = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information,
"Calibrate load",
"Please connect the \"load\" standard to port 0 of the NanoVNA.\n\n" +
"Press Ok when you are ready to continue.",
QtWidgets.QMessageBox.Ok | QtWidgets.QMessageBox.Cancel)
response = load_step.exec()
if response != QtWidgets.QMessageBox.Ok:
self.btn_automatic.setDisabled(False)
self.nextStep = -1
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
return
else:
self.app.sweep()
return
if self.nextStep == 2:
# Load
self.saveLoad()
self.nextStep = 3
continue_step = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information,
"1-port calibration complete",
"The required steps for a 1-port calibration are now complete.\n\n" +
"If you wish to continue and perform a 2-port calibration, press " +
"\"Yes\". To apply the 1-port calibration and stop, press \"Apply\"",
QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.Apply |
QtWidgets.QMessageBox.Cancel)
response = continue_step.exec()
if response == QtWidgets.QMessageBox.Apply:
self.calculate()
self.nextStep = -1
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
self.btn_automatic.setDisabled(False)
return
elif response != QtWidgets.QMessageBox.Yes:
self.btn_automatic.setDisabled(False)
self.nextStep = -1
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
return
else:
isolation_step = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information,
"Calibrate isolation",
"Please connect the \"load\" standard to port 1 of the NanoVNA.\n\n" +
"If available, also connect a load standard to port 0.\n\n" +
"Press Ok when you are ready to continue.",
QtWidgets.QMessageBox.Ok | QtWidgets.QMessageBox.Cancel)
response = isolation_step.exec()
if response != QtWidgets.QMessageBox.Ok:
self.btn_automatic.setDisabled(False)
self.nextStep = -1
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
return
else:
self.app.sweep()
return
elif self.nextStep == 3:
# Isolation
self.saveIsolation()
self.nextStep = 4
through_step = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information,
"Calibrate through",
"Please connect the \"through\" standard between port 0 and port 1 " +
"of the NanoVNA.\n\n" +
"Press Ok when you are ready to continue.",
QtWidgets.QMessageBox.Ok | QtWidgets.QMessageBox.Cancel)
response = through_step.exec()
if response != QtWidgets.QMessageBox.Ok:
self.btn_automatic.setDisabled(False)
self.nextStep = -1
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
return
else:
self.app.sweep()
return
elif self.nextStep == 4:
# Done
self.saveThrough()
apply_step = QtWidgets.QMessageBox(QtWidgets.QMessageBox.Information,
"Calibrate complete",
"The calibration process is now complete. Press \"Apply\" to apply " +
"the calibration parameters.",
QtWidgets.QMessageBox.Apply | QtWidgets.QMessageBox.Cancel)
response = apply_step.exec()
if response != QtWidgets.QMessageBox.Apply:
self.btn_automatic.setDisabled(False)
self.nextStep = -1
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
return
else:
self.calculate()
self.btn_automatic.setDisabled(False)
self.nextStep = -1
self.app.worker.signals.finished.disconnect(self.automaticCalibrationStep)
return
return
class Calibration:
notes = []
s11short: List[Datapoint] = []
s11open: List[Datapoint] = []
s11load: List[Datapoint] = []
s21through: List[Datapoint] = []
s21isolation: List[Datapoint] = []
frequencies = []
# 1-port
e00 = [] # Directivity
e11 = [] # Port match
deltaE = [] # Tracking
# 2-port
e30 = [] # Port match
e10e32 = [] # Transmission
shortIdeal = np.complex(-1, 0)
useIdealShort = True
shortL0 = 5.7 * 10E-12
shortL1 = -8960 * 10E-24
shortL2 = -1100 * 10E-33
shortL3 = -41200 * 10E-42
shortLength = -34.2 # Picoseconds
# These numbers look very large, considering what Keysight suggests their numbers are.
useIdealOpen = True
openIdeal = np.complex(1, 0)
openC0 = 2.1 * 10E-14 # Subtract 50fF for the nanoVNA calibration if nanoVNA is calibrated?
openC1 = 5.67 * 10E-23
openC2 = -2.39 * 10E-31
openC3 = 2.0 * 10E-40
openLength = 0
useIdealLoad = True
loadR = 25
loadL = 0
loadC = 0
loadLength = 0
loadIdeal = np.complex(0, 0)
useIdealThrough = True
throughLength = 0
isCalculated = False
source = "Manual"
def isValid2Port(self):
valid = len(self.s21through) > 0 and len(self.s21isolation) > 0 and self.isValid1Port()
valid &= len(self.s21through) == len(self.s21isolation) == len(self.s11short)
return valid
def isValid1Port(self):
valid = len(self.s11short) > 0 and len(self.s11open) > 0 and len(self.s11load) > 0
valid &= len(self.s11short) == len(self.s11open) == len(self.s11load)
return valid
def calculateCorrections(self) -> (bool, str):
if not self.isValid1Port():
logger.warning("Tried to calibrate from insufficient data.")
if len(self.s11short) == 0 or len(self.s11open) == 0 or len(self.s11load) == 0:
return False, "All of short, open and load calibration steps must be completed for calibration to be " \
+ "applied."
else:
return False, "All calibration data sets must be the same size."
self.frequencies = [int] * len(self.s11short)
self.e00 = [np.complex] * len(self.s11short)
self.e11 = [np.complex] * len(self.s11short)
self.deltaE = [np.complex] * len(self.s11short)
self.e30 = [np.complex] * len(self.s11short)
self.e10e32 = [np.complex] * len(self.s11short)
logger.debug("Calculating calibration for %d points.", len(self.s11short))
if self.useIdealShort:
logger.debug("Using ideal values.")
else:
logger.debug("Using calibration set values.")
if self.isValid2Port():
logger.debug("Calculating 2-port calibration.")
else:
logger.debug("Calculating 1-port calibration.")
for i in range(len(self.s11short)):
self.frequencies[i] = self.s11short[i].freq
f = self.s11short[i].freq
pi = math.pi
if self.useIdealShort:
g1 = self.shortIdeal
else:
Zsp = np.complex(0, 1) * 2 * pi * f * (self.shortL0 +
self.shortL1 * f +
self.shortL2 * f**2 +
self.shortL3 * f**3)
gammaShort = ((Zsp/50) - 1) / ((Zsp/50) + 1)
# (lower case) gamma = 2*pi*f
# e^j*2*gamma*length
# Referencing https://arxiv.org/pdf/1606.02446.pdf (18) - (21)
g1 = gammaShort * np.exp(np.complex(0, 1) * 2 * 2 * math.pi * f * self.shortLength * -1)
if self.useIdealOpen:
g2 = self.openIdeal
else:
divisor = (2 * pi * f * (self.openC0 + self.openC1 * f + self.openC2 * f**2 + self.openC3 * f**3))
if divisor != 0:
Zop = np.complex(0, -1) / divisor
gammaOpen = ((Zop/50) - 1) / ((Zop/50) + 1)
g2 = gammaOpen * np.exp(np.complex(0, 1) * 2 * 2 * math.pi * f * self.openLength * -1)
else:
g2 = self.openIdeal
if self.useIdealLoad:
g3 = self.loadIdeal
else:
Zl = self.loadR + (np.complex(0, 1) * 2 * math.pi * f * self.loadL)
g3 = ((Zl/50)-1) / ((Zl/50)+1)
g3 = g3 * np.exp(np.complex(0, 1) * 2 * 2 * math.pi * f * self.loadLength * -1)
gm1 = np.complex(self.s11short[i].re, self.s11short[i].im)
gm2 = np.complex(self.s11open[i].re, self.s11open[i].im)
gm3 = np.complex(self.s11load[i].re, self.s11load[i].im)
try:
denominator = g1*(g2-g3)*gm1 + g2*g3*gm2 - g2*g3*gm3 - (g2*gm2-g3*gm3)*g1
self.e00[i] = - ((g2*gm3 - g3*gm3)*g1*gm2 - (g2*g3*gm2 - g2*g3*gm3 - (g3*gm2 - g2*gm3)*g1)*gm1) / denominator
self.e11[i] = ((g2-g3)*gm1-g1*(gm2-gm3)+g3*gm2-g2*gm3) / denominator
self.deltaE[i] = - ((g1*(gm2-gm3)-g2*gm2+g3*gm3)*gm1+(g2*gm3-g3*gm3)*gm2) / denominator
except ZeroDivisionError:
self.isCalculated = False
logger.error("Division error - did you use the same measurement for two of short, open and load?")
logger.debug("Division error at index %d", i)
logger.debug("Short == Load: %s", self.s11short[i] == self.s11load[i])
logger.debug("Short == Open: %s", self.s11short[i] == self.s11open[i])
logger.debug("Open == Load: %s", self.s11open[i] == self.s11load[i])
return self.isCalculated, "Two of short, open and load returned the same values at frequency " \
+ str(self.s11open[i].freq) + " Hz."
if self.isValid2Port():
self.e30[i] = np.complex(self.s21isolation[i].re, self.s21isolation[i].im)
s21m = np.complex(self.s21through[i].re, self.s21through[i].im)
if not self.useIdealThrough:
gammaThrough = np.exp(np.complex(0, 1) * 2 * math.pi * self.throughLength * f * -1)
s21m = s21m / gammaThrough
self.e10e32[i] = (s21m - self.e30[i]) * (1 - (self.e11[i]*self.e11[i]))
self.isCalculated = True
logger.debug("Calibration correctly calculated.")
return self.isCalculated, "Calibration successful."
def correct11(self, re, im, freq):
s11m = np.complex(re, im)
distance = 10**10
index = 0
for i in range(len(self.s11short)):
if abs(self.s11short[i].freq - freq) < distance:
index = i
distance = abs(self.s11short[i].freq - freq)
# TODO: Interpolate with the adjacent data point to get better corrections?
s11 = (s11m - self.e00[index]) / ((s11m * self.e11[index]) - self.deltaE[index])
return s11.real, s11.imag
def correct21(self, re, im, freq):
s21m = np.complex(re, im)
distance = 10**10
index = 0
for i in range(len(self.s21through)):
if abs(self.s21through[i].freq - freq) < distance:
index = i
distance = abs(self.s21through[i].freq - freq)
s21 = (s21m - self.e30[index]) / self.e10e32[index]
return s21.real, s21.imag
@staticmethod
def correctDelay11(d: Datapoint, delay):
input_val = np.complex(d.re, d.im)
output = input_val * np.exp(np.complex(0, 1) * 2 * 2 * math.pi * d.freq * delay * -1)
return Datapoint(d.freq, output.real, output.imag)
@staticmethod
def correctDelay21(d: Datapoint, delay):
input_val = np.complex(d.re, d.im)
output = input_val * np.exp(np.complex(0, 1) * 2 * math.pi * d.freq * delay * -1)
return Datapoint(d.freq, output.real, output.imag)
def saveCalibration(self, filename):