ADVANTEST R3131 Series

R3131 Spectrum Analyzer Operation Manual
2.3.4 Measuring the VA Ratio
ADVANTEST R3131 Fri 19 Dec 1997 Marker(1)
REF 107.0 dBAV ATT 10dB A_max B_blnk
iodpi (75n) Posi Posi Normal
Marker Marker
MARKER 91.25 MHz -------
—92:SCCIBAy Delta
91.25 MHz Marker
Peak ▶
Menu
-- Sig Track
ON /OFF
Sound ▶
Marker
Off
CENTER 91.25 MHz SPAN 20.00 MHz 1/2,morelo.
RBW 300 kHz VBW 100 kHz SWP 50 ms
Figure 2-68 Measuring the Video Carrier Level
Measuring the audio carrier level
11. Press MKR, 9, 5, ., 7, 5 and MHz.
The marker is displayed at 95.75 MHz on the trace.
This marker level is called video carrier level A (dBmV).
ADVANTEST R3131
REF 107.0 dB,V
10cipi_c75o)
MARKER
95.77 MHz
Fri 19 Dec 1997 Marker(1)
ATT 10dB A_max B_blnk
CENTER 91.25 MHz
RBW 300 kHz VBW 100 kHz
Posi Posi Normal
Marker Marker
95.77 MHO - --
80.08 ABAV Delta
Marker
Peak ▶
Menu
Sig Track
ON /OFF
Sound 11,
" Marker
Off
SPAN 20.00 MHz 1/2,more1
SWP 50 ms
Figure 2-69 Measuring the Audio Carrier Level
12. Calculate the VA ratio using the following formula.
VA ratio (dB) = Video carrier level V (dBi_tV) - Audio carrier level A (dBi.i.V)
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