vna.preset()
vna.pause()
vna.clear_status()
# Setup channel 1
ch1 = vna.channel(1)
ch1.sweep_type = SweepType.power
ch1.start_power_dBm = -20.0
ch1.stop_power_dBm = 0
ch1.points = 201
ch1.if_bw_Hz = 1, 'kilo'
ch1.cal_group = 'example'
ch1.manual_sweep = True
# Setup Trc1: S21
s21_trace = vna.trace('Trc1')
s21_trace.parameter = 'S21'
# Setup Trc2: a1(P1)
vna.create_trace(channel=1, name='Trc2', parameter="a1(P1)")
a1_trace = vna.trace('Trc2')
a1_trace.diagram = 1
# Sweep, Retrieve data
power_dBm, s21_dB = s21_trace.measure_formatted_data()
a1_dBm = a1_trace.y_formatted
# Plot
plt.plot(power_dBm, s21_dB, 'r-', label="Ideal")
plt.plot(a1_dBm, s21_dB, 'b-', label="Measured")
plt.legend()
# alternatively, using pyvisa:
# vna.open('gpib', 20)
# preset and clear errors
vna.clear_status()
vna.preset()
vna.pause()
# create an interesting setup
# to save
ch1 = vna.channel(1)
ch1.start_frequency_Hz = 1.0e9
ch1.stop_frequency_Hz = 2.0e9
ch1.points = 401
trc1 = vna.trace('Trc1')
trc1.parameter = 'S11'
index = vna.create_diagram()
name = vna.create_trace()
trc2 = vna.trace(name)
trc2.parameter = 'S21'
trc2.diagram = index
# save
vna.save_active_set_locally(set_file)
vna.pause()
# preset (again)
vna.preset()
vna.settings.display = False
# sweep, measure time
vna.manual_sweep = True
vna.sweep_count = args.sweep_count
total_time_s = default_time_s(vna.sweep)
time_per_sweep_s = total_time_s / args.sweep_count
# save timing info
timing_info_file = data_path / 'timing_info.csv'
with timing_info_file.open('w') as f:
header = [ 'sweep_count', 'total_time_s', 'time_per_sweep_s']
data = [args.sweep_count, total_time_s, time_per_sweep_s ]
csvwriter = csv.writer(f)
csvwriter.writerow(header)
csvwriter.writerow(data)
# save trace history
for name in vna.traces:
filename = str(data_path / f'{name}.csv')
vna.trace(name).save_complex_history_locally(filename)
# verbose?
if not args.quiet:
print(f'total time: {si_format(total_time_s, precision=3)}s')
print(f'per sweep: {si_format(time_per_sweep_s, precision=3)}s')
# success
sys.exit(0)