vna = Vna()
# log
vna.open_log(log_file)
vna.print_info()
# connect to instrument (no visa)
vna.open_tcp(address)
# 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)
# Setup for full N-Port calibration with cal unit
vna.write("SENS1:CORR:COLL:AUTO:CONF FNPort,''")
# get cal steps
steps = get_cal_steps(ports, cal_size)
num_steps = len(steps)
# Define each cal step via SCPI
for i in range(1, num_steps + 1):
step = [str(n) for n in steps[i]]
step = ",".join(step)
scpi = "SENS1:CORR:COLL:AUTO:ASS{0}:TPOR {1}".format(i, step)
vna.write(scpi)
# For each cal step:
# - Make sure vna ports are connected
# - Start measurement
# - Wait until it completes
for i in range(1, num_steps + 1):
while connections(vna) != steps[i]:
input('Connect ports {0}'.format(step))
vna.write("SENS1:CORR:COLL:AUTO:ASS{0}:ACQ".format(i))
vna.pause(timeout_ms)
# Apply calibration
vna.write("SENS1:CORR:COLL:AUTO:SAVE")
# Close connection
vna.local()
vna.close()
from rohdeschwarz.instruments.vna import SweepType
import matplotlib.pyplot as plt
import numpy as np
# Open instrument connection
vna = Vna()
vna.open('TCPIP', '127.0.0.1')
# SCPI command log
vna.open_log("SCPI Command Log.txt")
print_header(vna.log, "Measure with a1", "0.0.1")
vna.print_info()
# Preset
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'
# Temp dir for cal data
vna.file.cd(Directory.default)
temp_dir = PureWindowsPath(vna.file.directory()) / 'CAL_UNIT_DATA'
if vna.file.is_directory(temp_dir):
vna.file.delete_all(temp_dir)
else:
vna.file.mkdir(temp_dir)
vna.file.cd(str(temp_dir))
# Export factory cal data files
# from cal unit to VNA,
# download to local computer
dest_dir = Path('.') / 'data'
vna.cal_unit().export_factory_cal(str(temp_dir))
vna.pause(10000)
for i in vna.file.files():
src = str(temp_dir / i)
dest = str(dest_dir / i)
vna.file.download_file(src, dest)
# Read data.
# Data file naming convention:
open_filename = 'CalibrationUnit Open (P{0}).s1p'
short_filename = 'CalibrationUnit Short (P{0}).s1p'
match_filename = 'CalibrationUnit Match (P{0}).s1p'
thru_filename = 'CalibrationUnit Through (P{0}P{1}).s2p'
# Read port 1
# open, short, match
# format is complex (re + j*im)
scpi = "SENS{0}:CORR:COLL:FIXT:LMP {1}";
scpi = scpi.format(channel, direct_comp)
vna.write(scpi)
# include loss compensation
# This setting is overridden if direct compensation
# is on
scpi = "SENS{0}:CORR:COLL:FIXT:LMP:LOSS {1}";
scpi = scpi.format(channel, include_loss)
vna.write(scpi)
# Measure a standard (short) at all ports
scpi = "SENS{0}:CORR:COLL:FIXT:ACQ {1},{2}"
scpi = scpi.format(channel, standard, ports_string)
vna.write(scpi)
vna.pause(10000) # wait for 10 s
# Optional:
# Can also measure another standard.
# The VNA will use the average of both
# results
standard = "OPEN"
scpi = "SENS{0}:CORR:COLL:FIXT:ACQ {1},{2}"
scpi = scpi.format(channel, standard, ports_string)
vna.write(scpi)
vna.pause(10000) # wait for 10 s
# Apply corrections
scpi = "SENS{0}:CORR:COLL:FIXT:SAVE"
scpi = scpi.format(channel)
vna.write(scpi)