TB 9-6625-2235-24
(10) Adjust TUNING control to position a 20 MHz comb signal on lst vertical
graticule line (fig. 8).
(11) Press FREQUENCY CAL pushbutton.
(12) Repeat (10) above.
(13) The 9th spectral signal will be within 0.4 division of 9th vertical graticule line
(fig. 8); if not, perform b below.
Figure 8. Frequency span accuracy measurement for 9th spectral line.
(14) Repeat technique of (10) through (13) above for FREQ SPAN/DIV switch
settings and synthesizer/level generator frequencies as listed in table 4.
NOTE
Adjust RESOLUTION BW switch, as necessary, to view signal.
(15) Disconnect synthesizer/level generator output from pulse 50Ω input of comb
generator and set FREQ SPAN/DIV switch to 100 MHz.
Table 4. Frequency Span Accuracy
Test instrument
Synthesizer/level
FREQ SPAN/DIV
generator
switch settings
frequencies
10
MHz
10
MHz
5
MHz
5
MHz
2
MHz
2
MHz
1
MHz
1
MHz
500
kHz
500
kHz
100
kHz
100
kHz
20
kHz
20
kHz
5
kHz
5
kHz
15