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13. 20 MHz Reference Adjustments
Procedure
3-104 Adjustments
1. Position instrument on right side as shown in Figure 3-56 and
remove bottom cover. Remove Al6 20 MHz Reference and install
on extenders. See Figure 3-57 for the location of Al6 components.
2. Set LINE switch to ON and press
3. Set rear-panel FREQ REFERENCE INT/EXT switch to INT.
Disconnect cable 2 (red) from A16Jl. Connect power meter to
output of Time Base (A27Jl) using cable 2 (red). Note power
meter indication for reference later.
4. Reconnect A27 Time Base output to A16Jl.
5. JumDer A16TP4 to Ground. Set the HP 8566A/B Spectrum
Analyzer to
[
CENTER FREQUENCY
)
LEVEL
[
N
REFERE
CE
line).
6. Set HP 8566A/B Spectrum Analyzer to 1 dB/division SCALE and
reset reference level to place peak of signal at reference line.
7. Connect DVM to A16TPl and ground to A22 TP12. Adjust
Disconnect DVM. (If DVM remains connected, it may load circuit.)
See Figure 3-57 for location of adjustment.
Figure 3-57. Location of 20 MHz Reference Adjustments
8. Adjust Al6 DOUBLER A16Tl to lower signal peak approximately
3 dB. Adjust Al6 CENTER FREQ A16Cll to peak signal on HP
9. Disconnect cable 2 (red) from A16Jl and connect 500 OUTPUT of
frequency synthesizer to A16Jl. Set FREQUENCY of frequency
synthesizer to 10.17 MHz and set AMPLITUDE to + 3 dBm. Set HP
).
PRESET
MHz,
20
)
SPAN
1 MHz,
)
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