def init_vna(self):
# Abkürzung
settings = self.config["VNA"]
# Serial-Config
port = settings["Port"]
baudrate = int(settings["Baudrate"])
self.vna = VNA(port, baudrate)
# VNA-Settings
points = int(settings["Points"])
power = int(settings["Power"])
average = int(settings["Average"])
self.vna.set_points(points)
self.vna.set_power(power)
self.vna.set_avg(average)
self.vna.measurecycles()
def init_vna():
ref_freq = 40e6
vna = VNA()
source_freq = 6.0e9
lo_freq = source_freq - 2e6
vna.set_tx_mux('iq', sample_input='adc')
vna.lo.freq_to_regs(lo_freq, ref_freq, apwr=0)
vna.source.freq_to_regs(source_freq, ref_freq, apwr=0)
#vna.dither_en(1)
#vna.set_tx_mux('samples', sample_input='adc')
vna.write_sample_time(int(40e6 / 1000 + 100))
#vna.write_sample_time(110000)
vna.write_io(pwdn=0, mixer_enable=0, led=1, adc_oe=0, adc_shdn=0)
vna.write_pll_io(lo_ce=1, source_ce=1, lo_rf=1, source_rf=1)
vna.write_att(0.0)
vna.write_switches(tx_filter=source_freq,
port=2,
rx_sw='rx2',
rx_sw_force=False)
vna.write_pll(vna.source)
vna.write_pll(vna.lo)
vna.write_pll(vna.source)
vna.write_pll(vna.lo)
vna.read_iq()
vna.read_iq()
return vna
def sw_terms(iqs, freqs):
"""Switch terms from IQ"""
sparams = []
for f in xrange(len(freqs)):
sw_f = iqs[f][('rx2',1)]/iqs[f][('b',1)]
sw_r = iqs[f][('rx1',2)]/iqs[f][('a',2)]
sparams.append( [[sw_f, 0], [0, sw_r]] )
return skrf.Network(s=sparams, f=freqs, f_unit='Hz')
ref_freq = 40e6
vna = VNA()
ports = [1, 2]
sw_correction = True
freqs = np.linspace(30e6, 6e9, 801)
vna.set_tx_mux('iq', sample_input='adc')
vna.write_att(7.0)
vna.write_sample_time(int(40e6/1000+100))
vna.write_io(pwdn=0, mixer_enable=0, led=1, adc_oe=0, adc_shdn=0)
vna.write_pll_io(lo_ce=1, source_ce=1, lo_rf=1, source_rf=1)
iqs = [{} for i in xrange(len(freqs))]
time.sleep(0.5)
class Stoerkoerpermessung:
def __init__(self, config, filename):
# Config auslesen
self.config_filename = config
self.config = ConfigParser()
self.config.read(config)
self.out_filename = filename
self.init_motor()
self.init_vna()
def init_motor(self):
# Abkürzung
settings = self.config["MOTOR"]
# Serial-Config
port = settings["Port"]
baudrate = int(settings["Baudrate"])
serial_timeout = float(settings["SerialTimeout"])
self.motor_serial = Serial(port, baudrate, timeout=serial_timeout)
# Motor-Config
motor_name = settings["Name"]
motor_config = settings["Config"]
self.motor = Motor(self.motor_serial, motor_name)
self.motor.load_motor_config(motor_config)
self.motor.scaling = float(settings["Scaling"])
def init_vna(self):
# Abkürzung
settings = self.config["VNA"]
# Serial-Config
port = settings["Port"]
baudrate = int(settings["Baudrate"])
self.vna = VNA(port, baudrate)
# VNA-Settings
points = int(settings["Points"])
power = int(settings["Power"])
average = int(settings["Average"])
self.vna.set_points(points)
self.vna.set_power(power)
self.vna.set_avg(average)
self.vna.measurecycles()
def measure(self):
#Abkürzung
settings = self.config["MEASUREMENT"]
start = float(settings["Start"])
stop = float(settings["Stop"])
# Checkmode Settings
checkmode = settings.getboolean("Checkmode")
cm_reference = float(settings["ReferencePoint"])
if start > stop:
start, stop = stop, start
# Überprüfung welche Methode der Berechnung der stepsize gewählt wurde.
# Entweder aus der Anzahl der Schritte oder mit fester angegebener step-
# size
if not (("StepSize" in settings) ^ ("Steps" in settings)):
raise RuntimeError("StepSize and Steps in configuration file are"
"mutually exclusive")
elif "StepSize" in settings:
stepsize = float(settings["StepSize"])
else:
steps = int(settings["Steps"])
stepsize = (stop - start) / steps
with open(self.out_filename, "w") as outf:
# Tabellenkopf
print("# Config: {}".format(self.config_filename), file=outf)
print("# Date: {}".format(asctime()), file=outf)
print("# Center: {}".format(self.vna.get_center()), file=outf)
print("# Span: {}".format(self.vna.get_span()), file=outf)
print("# Points: {}".format(self.vna.get_points()), file=outf)
if checkmode:
print("# P\tf\tf_ref\tfreq-t_ref", file=outf)
else:
print("# P\tf", file=outf)
pos = start
while stop - pos > -1E-6:
print("Measuring: d = {} mm".format(pos))
if checkmode:
f_ref = self.get_freq_at(cm_reference)
freq = self.get_freq_at(pos)
if checkmode:
print("{0:.3f}\t{1}\t{2}\t{3}".format(pos, freq, f_ref, freq - f_ref),
file=outf)
else:
print("{0:.3f}\t{1}".format(pos, freq), file=outf)
pos += stepsize
outf.flush()
self.motor.move_to(start)
def get_freq_at(self, pos):
delay = float(self.config["MEASUREMENT"]["Delay"])
average = int(self.config["VNA"]["Average"])
self.motor.move_to(pos)
while self.motor.is_moving():
sleep(0.1)
sleep(delay)
self.vna.measurecycles()
freq, refl = self.vna.mark[1].search_min()
return freq