> ## 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.

# build an InstroScope from a JSON config file

```python scope_config.py theme={null}
"""Example: build an InstroScope from a JSON config file.

Run:
    uv run python examples/scope/scope_config.py
"""

from pathlib import Path

from instro.scope import InstroScope, ScopeMeasurementType

# Edit visa_resource in the JSON to match the connected scope.
CONFIG_PATH = Path(__file__).parent / "scope_config_keysight_1200x.json"


def main() -> None:
    # open() applies the channels/acquisition/trigger blocks, then starts continuous
    # acquisition because the config sets start_acquisition_on_open.
    with InstroScope(config=CONFIG_PATH) as scope:
        vrms = scope.measure(ScopeMeasurementType.VRMS, channel=1)
        frequency = scope.measure(ScopeMeasurementType.FREQUENCY, channel=1)
        print(f"{scope.name}: ch1 {vrms.latest:.3f} Vrms @ {frequency.latest:.1f} Hz")


if __name__ == "__main__":
    main()
```