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10. Calibrage des capteurs

v2.0. Measurement is done by rbAmp smart modules over I2C. Each rbAmp arrives factory-calibrated per unit — ACRouter does not expose gain/offset/zero tuning. The one setting you make is the CT model. (The v1.x on-chip ADC calibration — ZMPT offset, gain trimming — is gone.)

10.1 The Only Calibration: CT Model

An rbAmp measures current with a clamp-on CT. Selecting the CT model that matches your physical clamp loads the correct factory scaling preset — this is the whole of user-side calibration. Do it once per channel during Commissioning (which has the full role + CT-model flow); this page is the reference.

Set it with the serial command or the REST API (or the web app's Sensors tab):

text
rbamp-ct-model <addr_hex> <code>
bash
curl -X POST http://192.168.4.1/api/rbamp/modules/ct-model \
  -d '{"addr":"0x51","ct_model":"sct013-030"}'

Supported CT models

Serial code REST id Capteur Rated
1 sct013-005 SCT-013-005 5 A
2 sct013-010 SCT-013-010 10 A
6 sct013-020 SCT-013-020 20 A
3 sct013-030 SCT-013-030 30 A
4 sct013-050 SCT-013-050 50 A

The serial codes are historical catalog IDs, not ordered by rating — note code 6 = 20 A (it falls between 10 A and 30 A). Use the exact code for your clamp; don't infer it from the number.

60 A / 100 A codes exist in the catalog but are not yet preset-backed — don't rely on them. The live catalog is GET /api/rbamp/ct-models (entries with available:false are the unsupported ones).

10.2 Set It Once — the Overwrite Caveat

🔴 Choose the CT model once, for your actual clamp — don't toggle it.

Applying a CT model loads that model's factory gain preset, which overwrites the module's per-unit factory gain calibration. To protect against needless overwrites, ACRouter uses verify-then-set: it reads the module's current model first and writes only if it differs — so re-applying the same model is a safe no-op (the command reports it as queued, verify-then-set). Only a genuine change rewrites the gain, so pick the right model at commissioning and leave it.

10.3 Verifying Accuracy

There is no separate reference-measurement command. To check a module reads correctly:

  1. GET /api/rbamp/modules (or the web app's Sensors tab) — shows live per-module voltage / current / power / PF / frequency, and the applied ct_model (so you can confirm the model took). Compare against a known load or a handheld clamp meter. (The serial rbamp-status lists only the discovered modules and their roles — no live readings; the nearest serial view is sensor-hub, which shows the merged per-role values.)
  2. Signed grid under a known load — confirm power_grid reads + on import and − on export (see Commissioning → Verify Sensing). A wrong sign means the grid channel isn't voltage-capable, or the clamp polarity is reversed (flip the CT).

10.4 Related

10.1 The Only Calibration: CT Model 10.2 Set It Once the Overwrite Caveat 10.3 Verifying Accuracy 10.4 Related