Summary (Bluetooth Spectrum)
The trace reports the scalar results of the active Test Purpose, grouped as the verdict, the carrier and its neighbors, and the emissions test. Rows that the active test purpose does not produce are not shown.
A row reads when the value was not measured or no verdict applies — for example when the carrier channel falls outside the acquisition span, which invalidates every carrier-relative figure below it.
Verdict
Limit Test Result - The overall PASS/FAIL verdict of the emissions limit test.
This verdict applies the specification's exception-band allowance, so it can read PASS while the Band Table shows individual failing bands. Exception Bands is the row that explains how close such a pass came to failing.
Carrier
Carrier Channel - The radio channel index the transmitter occupies. Every carrier-relative figure in this table is measured against this channel. It is flagged like a failed limit test when that channel is not inside the acquisition span, because that invalidates the same set of results a failure would.
Carrier Band - The carrier's index on the 1 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. measurement-band grid, which is not the same number as Carrier Channel. For LE, band n is centered at 2401 + n MHz while channel k is centered at 2402 + 2k MHz, so the carrier band is 2k + 1: channel 0 is band 1 and channel 19 is band 39. Because every per-band limit is stated as an offset from the carrier band, this row identifies the band the mask is centered on.
TX Transmit or transmitter Reference Power - The power measured in the transmit channel. It is the reference for the two adjacent-channel ratios below.
Adjacent Lower (-1 ch) / Adjacent Upper (+1 ch) - The power in the channels immediately below and above the carrier, expressed in dB relative to TX Reference Power — a ratio, not an absolute power.
Total In-band Power - The total power integrated across the full grid, in dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer.
Emissions Test
Worst Offender Channel / Frequency / Power / Margin - The location, center frequency, measured level, and margin to the limit of the emission with the least margin. A negative margin indicates a band that exceeded its limit.
Exception Bands - How much of the specification's exception allowance the device used, reported as used / allowed. A pass that consumed the whole allowance is visibly marginal rather than indistinguishable from a clean one.
Dynamic Range Margin - How far the measured noise floor sits below the tightest limit in force. A positive value means the limit is verifiable; a value at or below zero means a PASS proves nothing, because the analyzer's own noise floor is at or above the limit line. It is colored like a limit test, since it is a check on whether the other checks are meaningful.
See Also
