Why does a corrected reading need a band?

Every use of it is a comparison against a threshold. A reading of 1188 against a target of 1200 fails, and drift can move it either side of that line.

How do I estimate drift?

Use the change between your last two certificates, scaled by the time since. With one certificate only, be conservative; radiometers degrade one way.

My correction factor is 1.3. Is that a problem?

It is a signal. A working instrument needing a 30% correction has degraded, and its noise and further drift usually rise as its response falls.

Does correcting fix a band mismatch?

No, and the mismatch is the larger error. A factor scales response within the measured band; it cannot make a different band relevant to the chemistry.

UV Curing calculator

UV Radiometer Calibration Correction Calculator

Correct a raw radiometer reading and see the uncertainty around it. Enter the display, the certificate factor, the target dose and how far the instrument may have drifted.

What this calculator does

Correct a raw radiometer reading with its calibration factor and show the band the instrument's drift puts around it.

Formula used

Corrected dose = raw reading × calibration factor
Lower bound = corrected dose × (1 − drift ÷ 100)
Upper bound = corrected dose × (1 + drift ÷ 100)
Headroom on the nominal reading = corrected dose − target dose
Headroom at the bottom of the band = lower bound − target dose

Inputs explained

Raw Radiometer Reading: What the instrument displayed, before any correction.
Calibration Correction Factor: Multiplier from the calibration certificate for this detector head.
Target Cure Dose: The dose the process must deliver, in the same band.
Drift Since Calibration: Change between your last two certificates, scaled by elapsed time.

How to use the result

Best suited to deciding whether a borderline reading passes, setting a recalibration interval from observed drift, reconciling a reading before a customer audit.
Treats drift as symmetric, when detector response tends to fall one way. Cannot fix a band mismatch, which is a larger error than calibration. Ignores temperature effects and disagreement between different instruments.

Common questions

Why does a corrected reading need a band? Every use of it is a comparison against a threshold. A reading of 1188 against a target of 1200 fails, and drift can move it either side of that line.
How do I estimate drift? Use the change between your last two certificates, scaled by the time since. With one certificate only, be conservative; radiometers degrade one way.
My correction factor is 1.3. Is that a problem? It is a signal. A working instrument needing a 30% correction has degraded, and its noise and further drift usually rise as its response falls.
Does correcting fix a band mismatch? No, and the mismatch is the larger error. A factor scales response within the measured band; it cannot make a different band relevant to the chemistry.

Last reviewed 2026-10-01.