How the source's CONFIG becomes channels, what enabling a signal starts, and how a signal's scale and offset are calibrated. Martino Ferrari Signals and calibration

The source's CONFIG message describes its signals: a name, a unit and a type. udpscope turns each enabled signal into a channel — a ring of values beside the shared time ring — and a channel is what a trace plots. Calibration is a scale and an offset applied at ingest.

How to reach it

Click the + badge in the badge bar, or press g. The Signals page lists what can be added — the signals the source declares that are not acquired yet, each with a tick that acquires it. Past six acquired signals the badges fold into one N signals badge, and the page then lists every signal.

Once a signal is acquired its badge appears. Click it to open that signal's page: its colour, Plot on buttons for the rows, and Information and Calibrate, where the signal's details and its calibration live.
Worth knowing

Signals start disabled, and enabling one is what starts acquiring it. A trigger on a signal nobody acquires can never fire, so arming a trigger enables its signal for you.

Calibrate on a signal's page opens the gain and offset it is currently drawn through, so a trace already scaled by a gain of 2 shows 2 — pressing Apply confirms it rather than resetting it. A signal nobody calibrated shows the identity, 1 and 0.

Calibration is applied at ingest, so changing it re-plans the buffer and drops the history. So does enabling or disabling a signal, and so does a new CONFIG. An empty plot for a second after one of those is the ring refilling, not a fault.

The stream's first signal is usually its timestamp, and that one is never acquired. It cannot be plotted, measured or used as a math source, and udpscope refuses to put it in a row rather than binding a trace that would read nothing for ever.

A signal's colour follows the signal, not the slot, so the same signal on two rows is one colour, and the dot on its badge shows it. A signal on no row gets a grey dot rather than none.

Change a signal's colour with Change colour on its page; a signal on no row has no trace to colour, so the button is dimmed. The colour is saved with the session; Default colour on the same page gives the palette entry back.
Example

A source declaring time, sine, ramp and noise yields three plottable signals. Enable all three and the exit dump reads 3 signals, 3 channels; time is not among them.