Tektronix RSA3408B, Руководство по обслуживанию

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Brief Procedures
3- 6
RSA3408B Analyzer Service Manual
Span RBW
Setup display
Span setting
Figure 3- 2: Setup display
c.
Using the general purpose knob, change the span setting as listed in
Table 3--1 and check that the RBW is displayed correctly.
Table 3- 1: Span and RBW
Span RBW
36 MHz 100 kHz
15 MHz 80 kHz
5 MHz 20 kHz
100 kHz 500 Hz
1 kHz 20 Hz
d.
Using the numeric keypad, set the span back to 36 MHz.
(Press 3 > 6 > MHz , in that order, on the keypad.)
7. Check the reference level:
a. Press the Amplitude key on the front panel.
b.
Make sure that the reference level is set to 0 dBm with the
Ref Level
side key. Check that 0 dBm is displayed on the upper left side of the
graticule (see Figure 3--3).
c.
Use the general purpose knob to set the reference level to --30 dBm.
d. Confirm that “Overrange -- increase RefLev or Atten” is indicated in the
red box at the top center of the screen. Make sure that --30 dBm is
displayed on the upper left side of the graticule and that the spectrum
waveform is distorted as shown in Figure 3--3.
e. Using the numeric keypad, set the reference level back to 0 dBm.
(Press 0 > Enter , in that order, on the keypad.)