TB 9-6625-2339-24
(f) SPAN, 7, ., 5, [MHz].
(g) AMPLITUDE, [Scale/Div], 1, [dB].
(h) [More], [Y Axis Units] (or Amptd Units), [dBm].
(i) BW/Avg, [Res BW], 5, [MHz].
(j) [Video BW], 3, 0, [Hz].
(4) Press TI Peak Search (or Search), [Meas Tools], [Mkr CF].
(5) Adjust RF reference source amplitude to position the signal for a marker
amplitude reading of -5 dBm +/- 0.2 dB.
(6) Set RF reference source amplitude steps to 3 dB.
(7) Press TI Peak Search (or Search), Marker, [Delta].
(8) Step RF reference source amplitude up 3 dB.
(9) Press TI Marker key, then lower the marker frequency by adjusting the RPG
knob (ccw) until the marker delta amplitude is 0 +/- 0.05 dB.
(10) Record the marker frequency readout as the lower 3 dB frequency in table 17.
(11) Raise the TI marker frequency by adjusting the RPG knob (cw) until the marker
delta amplitude is 0 +/- 0.05 dB.
(12) Record the marker frequency readout as the upper 3 dB frequency in table 17.
(13) Subtract the lower 3 dB frequency recorded in (10) above from the upper 3 dB
frequency recorded in (12) above. The result will be within the limits specified in table 17.
(14) Step RF reference source amplitude down 3 dB.
(15) Press TI Marker, [Normal] keys.
(16) Repeat technique of (3) (f) and (i) and (4) through (15) above for the TI BW and SPAN
Table 17. 3 dB Resolution Bandwidth Accuracy
Test instrument
Mkr1 indications
SPAN
BW
settings
settings
(MHz)
Lower
Upper
marker
marker
Min
Max
(MHz)
(MHz)
frequency
frequency
(MHz)
(MHz)
7.5
5
3.5
6.5
4.5
3
2.55
3.45
1.5
1
0.85
1.15
0.450
0.300
0.255
0.345
0.150
0.100
0.085
0.115
0.045
0.030
0.0255
0.0345
0.015
0.010
0.0085
0.0115
0.0045
0.003
0.00255
0.00345
0.0015
0.001
0.00085
0.00115
(17) Set RF reference source amplitude to -7 dBm.
(18) Press TI BW/Avg, [Res BW], 1, 2, 0, [kHz] and SPAN, 1, 8, 0, [kHz] keys.
(19) Press TI Peak Search (or Search), [Meas Tools], [Mkr CF].
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