def VnaMeasure(ui, ip, port):
# Disable button after click
ui.measure_vna.setEnabled(False)
ui.left_button.setEnabled(False)
ui.right_button.setEnabled(False)
channel = VnaChannel(ip, port, 1) # One channel
# channel.reset()
channel.set_four_channels()
sdata = [] # Clean sdata for each measure
for idx, spar in enumerate([SParameters.S11, SParameters.S12, SParameters.S21, SParameters.S22]):
print "Now measuring: " + str(spar)
channel.set_sweep_type(SweepType.LINEAR)
channel.channel = idx + 1
points = str(ui.points_field.text())
fmat = DataFormat.LOG # By default we use MLOG
fmat_index = ui.format_combobox.currentIndex()
formats = [DataFormat.LOG,
DataFormat.LIN,
DataFormat.LIN_PHASE,
DataFormat.PHASE,
DataFormat.GDELAY,
DataFormat.SMITH_LIN_PHASE,
DataFormat.SMITH_LOG_PHASE,
DataFormat.SMITH_RE_IM,
DataFormat.SMITH_R_JX,
DataFormat.SMITH_G_JB]
fmat = formats[fmat_index]
if ui.center_span_radio.isChecked():
groupbox = ui.bottom_layout.itemAt(3).widget()
center_freq = float(groupbox.findChild(QtGui.QLineEdit, "center_field").text())
span_freq = float(groupbox.findChild(QtGui.QLineEdit, "span_field").text())
channel.set_center_span(center_freq, span_freq)
channel.set_traces(1)
channel.set_points(points)
channel.set_sparam(1, spar)
channel.set_format(fmat) # set the selected format
channel.activate_channel()
channel.activate_trace(1)
channel.set_continuous(True)
elif ui.start_stop_radio.isChecked():
groupbox = ui.bottom_layout.itemAt(3).widget()
freq_start = float(groupbox.findChild(QtGui.QLineEdit, "freqstart_field").text())
freq_stop = float(groupbox.findChild(QtGui.QLineEdit, "freqstop_field").text())
channel.set_start_stop(freq_start, freq_stop)
channel.set_traces(1)
channel.set_points(points)
channel.set_sparam(1, spar)
channel.set_format(fmat) # set the selected format
channel.activate_channel()
channel.activate_trace(1)
channel.set_continuous(True)
if ui.autoscale_checkbox.isChecked():
channel.auto_scale() # Autoscale
f = str(ui.vna_file_field.text())
retrieve_data(ip, port, f, fmat, channel.executor)
for ch, sparam in zip([1,2,3,4], [SParameters.S11, SParameters.S12, SParameters.S21, SParameters.S22]):
channel.channel = ch
channel.set_sparam(1, sparam)
channel.channel = 1
channel.executor.close()
# Reenable buttons once measure has finished
ui.measure_vna.setEnabled(True)
ui.left_button.setEnabled(True)
ui.right_button.setEnabled(True)
def con_alt_measure(smu_params, vna_params, delay, conn_keithley, conn_vna):
points = smu_params["steps"]
sweep_time = delay*points
# Prepare K4200 to measure
params.append(smu_params)
params.append(vna_params)
ch = smu_params["index"] + 1
if smu_params["mode"] == "voltage":
source_mode = SourceMode.VOLTAGE
source_type = SourceType.VOLTAGE
if smu_params["mode"] == "current":
source_mode = SourceMode.CURRENT
source_type = SourceType.CURRENT
start = smu_params["start"]
stop = smu_params["stop"]
step = smu_params["step"]
compliance = smu_params["compliance"]
sweep_type = SweepType.LINEAR # Always linear.
smu = SMUSweep(ch, source_mode, source_type, start, stop, step,
compliance, sweep_type, 'V%s' % ch, "I%s"%ch)
device = K4200(conn_keithley[0], conn_keithley[1])
device.attach(smu)
device.configure()
device.executor.execute_command("SS DT {time}".format(time=delay))
# device.executor.execute_command("SS HT {time}".format(time=2.2))
# Prepare VNA to measure
vna = VnaChannel(conn_vna[0], conn_vna[1], 1)
vna.set_four_channels()
vna.set_bus_trigger()
def measure_vna(vna):
vlock.acquire()
vna.trigger()
vlock.release()
def measure_keithley(keithley):
klock.acquire()
keithley.measure()
klock.release()
for i in range(1,5): # Measure using four channels, once per S parameter
vna.channel = i
vna.set_continuous(False)
vna.set_immediate()
vna.activate_channel()
vna.set_traces(1)
vna.activate_trace(1)
vna.set_points(points)
vna.set_format(vna_params["format"])
vna.set_sparam(1, i) # Assign S11 to ch1, S12 to ch2, S21 to ch3 and S22 to ch4
vna.set_sweep_time(sweep_time)
if vna_params["type"] == "center_span":
vna.set_center_span(vna_params["freq_center"], vna_params["freq_span"])
elif vna_params["type"] == "start_stop":
vna.set_center_span(vna_params["freq_start"], vna_params["freq_stop"])
# Run in different threads to ensure start at the same time
start_new_thread(measure_vna, (vna,))
start_new_thread(measure_keithley, (device,))
start_new_thread(check_vna, (vna,vna_params))
start_new_thread(check_keithley, (device,smu_params))
