> ## Documentation Index
> Fetch the complete documentation index at: https://instro.nominal.io/llms.txt
> Use this file to discover all available pages before exploring further.

# sweep a NanoVNA, read networks, and save a touchstone file

<Warning>
  This example uses `instro-unstable`. This code is new and may change without notice.
</Warning>

```python vna_nanovna_read_touchstone.py theme={null}
"""Example: sweep a NanoVNA, read networks, and save a touchstone file.

Run:
    uv run python examples/vna/vna.py
"""

from instro.unstable.vna.drivers import NanoVNAv2Clone
from instro.unstable.vna.storage import DiskStorage
from instro.unstable.vna.vna import InstroVNA

SERIAL_PORT = "/dev/ttyACM0"  # Replace with your NanoVNA's serial port.

vna = InstroVNA(
    name="myVNA",
    driver=NanoVNAv2Clone(port=SERIAL_PORT),
    storage=DiskStorage(),  # Defaults to a fresh temp dir; pass path=... to choose a location.
)

# Numeric getters are wrapped as Measurements (published when publishers are configured).
start = vna.get_freq_start()
print(f"sweep start: {start.latest:.0f} Hz")

# Full S-parameter data comes back as skrf.Network objects.
network = vna.get_network()
print(network)

# Save a touchstone file and get its path back.
path = vna.save_network("example_sweep")
print(f"saved: {path}")

vna.close()
```