Radiated Emission Limit Check Sheet

Enter the receiver reading and correction factors (antenna factor, cable, attenuator, preamp) per frequency and the sheet computes field strength in dBµV/m and the margin to the limit. With an expanded uncertainty (U) it also separates “within the limit even with uncertainty” from “overlaps the uncertainty band”.

Expanded uncertainty U (dB)

Leave 0 if you do not know your uncertainty. The verdict compares the margin with U.

Standard limit preset

Fill in the frequency column first, then pick a preset to fill the limit column. These are quasi-peak limits for 30 MHz–1 GHz; at the band edge (230 MHz) the stricter limit applies. Rows with an empty or out-of-range frequency are left unchanged.

Frequency (MHz)	Reading (dBµV)	Antenna factor (dB/m)	Cable (dB)	Attenuator (dB)	Preamp (dB)	Limit (dBµV/m)	Field strength (dBµV/m)	Margin (dB)	Margin with U (dB)	Verdict	Delete this row

Load a CSV file

Import by pasting a table (CSV / spreadsheet)

Column order: frequency, reading, antenna factor, cable, limit (5 columns) or frequency, reading, antenna factor, cable, attenuator, preamp, limit (7 columns). Comma, tab and semicolon separators are detected.

How to use

The reading is the dBµV value shown by your receiver. If you have dBm from a spectrum analyzer, convert it first with the dBm→dBµV calculator (+107 at 50 Ω).
Field strength E = reading + antenna factor + cable + attenuator − preamp gain. Enter preamp gain as a positive number.
Empty cable, attenuator and preamp cells count as 0 dB.
Margin = limit − field strength. Margin with U = margin − U.
Rather than typing limits by hand, enter the frequencies and use a standard limit preset. Preset values are for reference; confirm the final limits against the standard itself.

Verdict rules

Verdict	Condition	Meaning
Within limit (with U)	margin − U ≥ 0	Below the limit even allowing for uncertainty
Overlaps uncertainty	0 ≤ margin < U	Measured value is under the limit but uncertainty prevents a clear call
Over the limit	margin < 0	Measured value exceeds the limit

Whether an “overlap” counts as pass or fail depends on your laboratory’s decision rule (for example ILAC-G8 or the uncertainty clauses of the standard) and the certifier’s requirements. This sheet only shows which side you are on; it is not an official verdict.

Privacy and storage

Nothing you enter is sent to a server. So you can continue later, values are kept only in your browser’s local storage on this device. On a shared computer press “Clear all” when you finish. We recommend not entering confidential test data.

Related calculators

Results and summaries are for reference. For certification and test reports use the latest official standard text and calibrated instrument data.