3 Short-Range Comms & IoT Mode
3.3 LoRa (CSS) Demodulation Measurement
When averaging is On, four colored traces will be displayed on this window to
represent the instantaneous frequency drift (green), the RMS averaged frequency
drift (yellow), the max-hold frequency (cyan) drift and the min-hold frequency drift
(magenta), respectively. Markers can only be enabled on the trace representing the
RMS averaged frequency drift (yellow).
3.3.2.7 Metrics
The Metrics window displays measurement results as noted below:
Carrier Power Represents the average power detected at the carrier frequency
Carrier
Frequency
Error
Represents the difference between the instrument’s tuned center frequency and the detected carrier’s
frequency
Deviation
Peak+
Represents the maximum value of the frequency deviation during the acquisition period
The impact of the frequency drift will be removed before the calculation
Deviation
Peak-
Represents the minimum value of the frequency deviation during the acquisition period
The impact of the frequency drift will be removed before the calculation
Deviation (Pk –
Pk)/2
Represents the half of the difference between the deviation Peak+ and Peak-
Deviation RMS Represents the RMS frequency deviation during the acquisition period
RMS Ratio Represents the ratio between the displayed value of RMS modulation and the ratio reference (see below).
This result is only displayed when “RMS ratio” is selected under Display->Metrics Settings
Ratio
Reference
Represents the reference value used for calculating the RMS ratio
This value is only displayed when “RMS Ratio” is selected
Burst Length Represents the time duration of the analyzed burst
Payload
Length
Represents the time duration of the payload in the analyzed burst. This is calculated by subtracting the
preamble length from the burst length. Since the value of the preamble length is calculated based on the
measurement settings rather than the measurement results, it could be possible that the payload length
is less than 0 after the calculation under some circumstances. In such a case, ‘---' is displayed
Pmbl. Length Represents the time duration of the preamble in the analyzed burst. This value is calculated based on the
settings (the spreading factor, the bandwidth, the programmed preamble length, etc.) on the panel of the
Demod tab under Meas Setup
Sync Byte #1 The first 8 bits of the sync word. If the measurement interval doesn’t cover the byte, “---” is displayed
Sync Byte #2 The second 8 bits of the sync word. If the measurement interval doesn’t cover the byte, “---” is displayed
Short Range Comms & IoT Mode User's &Programmer's Reference 321
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