#Scale a raw signal into engineering units

Turn a raw reading, like volts or counts, into the unit you work in, like bar or N. You check it against the live value before you save.

#Before you start

• An input that is running, so its channels have live readings.
• The numbers that convert the reading: a slope and offset, a sensitivity, two known points, polynomial coefficients, or a certificate table.

#Steps

1. Open Inputs and click the input's row. Its channels are listed under it.

2. Click a channel, then press Edit calibration. Some connectors keep calibration on their own page; the button then reads Calibrate on the … connector and opens it.

3. Under Scaling, pick a type and fill in its numbers:

   Type	Fill in
   Linear · y = a·x + b	slope & offset, a sensitivity from the sensor's certificate, or two points (what the channel reads → what it really is)
   Polynomial	Coefficients, low order first: y = c0 + c1·x + c2·x² + …
   Table	Points, raw → engineering; straight lines join them. Add row, or paste two columns
   Thermocouple	type K, from volts. Offered only when the channel reads volts
   Formula	an expression over this reading and other named channels, like (x - bias) / gain

4. Under Becomes, type the unit the reading turns into, like bar. The raw unit is filled in for you.

5. Optional: add a Label, like PT-100 shunt, cert 2026-114.

6. Watch Live now at the bottom. It shows raw … → … with your draft applied to the live reading.

7. Press Save calibration.

#Share one calibration across channels

Under Also apply to, tick other channels that should use the same calibration. Each shows what it would read. Edit it once later, and every channel on it updates.

When you edit a shared calibration, Save it to asks whether to change all its channels or only this one.

#Check it worked

The channel's row shows raw … → … in your unit, and Scaled by names the calibration. On Live, the channel reads in the new unit.

Updated November 6, 2026