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T A K I N G
M E A S U R E M E N T S
o
o Un-checking this box will zero the relative power reading and
Show FM: Check this box to view FM modulation measurements.
⇒
Show AM: Check this box to view AM modulation measurements.
⇒
3.7.2
The Analyzer Data Window
RF COUNTER displays the carrier frequency. It has a 1/100 Hz resolution, but
⇒
its accuracy may be lower than this at high frequencies or IF bandwidths.
FM Modulation Readings are readings taken on the FM modulation after IF and
⇒
audio filtering. The units for all FM readings are Hz.
o RMS: This is the root mean square of the FM modulation, sometimes
referred to as the average FM deviation.
o RMS : With single tone modulation, this is equal to the FM Peak+
or Peak- with noise spikes smoothed.
o PEAK+: This is the highest instantaneous frequency above the carrier
o PEAK-: This is the highest instantaneous frequency below the carrier
o Audio Freq: This is the count of the demodulated audio frequency
Relative Power is the change in power reported from the Synchronous / Average
⇒
power detector. The reference power level (0 dBc) is set to the power when the
overlapping area, the
become available. Select the low power range to generate a
correction for spanning the two gains. Once this correction
value is calculated, an asterisk will appear by "Relative Power"
indicating you are in the high-sensitivity range. You can now
step power across the full dynamic range. When you need to
go above -45 dBm or so, select High Power Range again.
There is no limit to the step size, except for the compression
point in each range.
Checking the Synchronous / Average Level Detector box
will zero the relative power reading and enable the
synchronous detector. Use this to measure a clean, phase-
locked RF CW signal over a 140 dB dynamic range. Use a
common external 10 MHz reference.
enable the average detector. Use this to measure a noisy,
modulated, or drifting signal over a 80-90 dB dynamic range.
21
"Low Power Range" button will
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