220 Keysight N9915-90020 User’s Guide
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
Channel Measurements
Meas UNCAL Error
Meas UNCAL appears in the lower-left corner of the screen when the FieldFox
can NOT display accurate measurement results with the current settings.
Usually, the part of the trace that is inaccurate is shown at –200 dB.
The following situation can produce Meas UNCAL:
— When the ResBW/VBW ratio exceeds 10,000, causing the VBW filter to
reach the maximum capacity for averaging.
Old Data Indicator (*)
In SA mode, when the current trace does not exactly match the annotation that
is on the screen, an asterisk is displayed in the upper-right corner of the screen
graticule area. This would occur, for example, when the Res BW setting is
changed while in sweep Hold mode. The annotation is changed immediately,
but the trace is not updated until the next sweep occurs. Therefore, the current
data trace does not match the screen annotation. See the asterisk in Figure
9-1 on page 147
.
Channel Measurements
The following Channel Measurements are offered in SA Mode:
Channel Power
“Channel Power (CHP)” on page 222
Occupied Bandwidth “Occupied Bandwidth” on page 223
Adjacent Channel Power Ratio “Adjacent Channel Power Ratio (ACPR)”
on page 225
Radio Standards and Channel Measurements
To tune the frequency range of any of the Channel Measurements using
channels instead of frequency, first select a Radio Standard, then select Units =
CHAN. Learn how to select a Radio Standard and channels in “How to select a
Radio Standard” on page 155
.
When you first select a Radio Standard, then select a Channel Measurement:
— With Units = FREQ selected, the center frequency and span will ALWAYS
change to the full frequency range of that standard (Uplink and Downlink)
to allow for a quick scan of energy. The X-axis annotation indicates the
frequency range.
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