Data

Data#

Real one-port reflection measurements used by the notebooks. The files are Touchstone .s1p, real and imaginary parts of S11 referred to 50 Ω, and can be opened with any RF tool or read as text.

In the notebooks, load them with vnacourse.data.load_repetitions, for example load_repetitions("standards", "open").

Contents#

Folder

Device measured

Repetitions

standards/short/

short-circuit calibration standard

10

standards/open/

open-circuit calibration standard

10

standards/load/

50 Ω load calibration standard

10

dut/load_33ohm/

33 Ω resistor

3

dut/load_75ohm/

75 Ω resistor

3

Each repetition is a separate sweep saved to its own file, rep_01.s1p, rep_02.s1p, and so on.

Acquisition#

Instrument

NanoVNA-F V2

Frequency range

50 kHz to 1.45 GHz

Points per sweep

1001, linearly spaced (about 1.45 MHz apart)

Reference impedance

50 Ω

Correction applied

none by the acquisition software: the source repository records these sweeps as “uncalibrated / raw”

What the data itself shows, and what the notebooks rely on:

  • The readings of the three standards are far from ideal below about 150 MHz (the open reads up to |S11| = 2.1) and within a few percent of ideal above.

  • After a SOL calibration computed from standards/, the two resistors read within about 2 Ω of their nominal values below 10 MHz.

  • Over the full band the corrected reflection coefficient of both resistors rotates as it would behind roughly 1 ns of transmission line. The resistors were therefore not at the calibration plane. Notebook 03 uses this to discuss the reference plane.

Not recorded with the data: the model and definition of the calibration kit, the fixture or cable used for the resistors, connector torque, temperature and warm-up time. The notebooks treat the standards as ideal.

Provenance#

The files are copied, byte for byte, from the research repository telmomm/nanovna-calibration (commit 0d0cb62), archived on Zenodo: doi:10.5281/zenodo.22722703. Only the paths changed:

Here

In nanovna-calibration

standards/<standard>/rep_NN.s1p

data/calibration/<standard>/test_N.s1p

dut/load_33ohm/rep_NN.s1p

data/measures/load 33 (5)/test_N.s1p

dut/load_75ohm/rep_NN.s1p

data/measures/load 75 (6)/test_N.s1p

That repository holds more measurements (other standard sets, attenuators, an LC network, and two-port .s2p versions of every sweep).

Licence#

Creative Commons Attribution 4.0 International. If you use the data, cite the Zenodo record above.