Chapter 3 141
Manual Adjustment Procedures
8. 10 MHz Reference Adjustment — TCXO (Option 103)
Equipment
Microwave frequency counter .......................... 5343AOption001
Frequency standard .................... 5061BCesiumBeamStandard
(or any 10 MHz frequency standard with accuracy <±1 X 10
−10
)
Cables
BNC, 122 cm (2 required) ...................................................10503A
Procedure
NOTE Allow the spectrum analyzer to warm up for at least 30 minutes before
performing this adjustment.
1. Connect the equipment as shown in Figure 3-17“10 MHz Reference
Adjustment Setup — TCXO,” on page 140. Prop up the A14
frequency control assembly.
2. Set the frequency counter controls as follows:
Sample rate ............................................................. Midrange
50Ω−1 MΩ switch ............................................................ 50Ω
10 Hz−500 MHz/500 MHz−26.5 GHz switch ..10Hz− 500MHz
3. Press
AUX CTRL REAR PANEL. Verify that the 10 MHz reference is set
to
10 MHz INT.
NOTE When the 10 MHz reference is set to 10 MHz EXT, the TCXO is not
operating and warmed up. If the reference is set to
10 MHz
EXT, set the reference to 10 MHz INT and allow 30 minutes for the TCXO
to warm up.
4. Remove dust cap from A15U302, TCXO. The dust cap is toward the
rear of the spectrum analyzer.
5. Adjust 10 MHz ADJ on A15U302 for a frequency counter reading of
300.000000 MHz ±30 Hz.
6. Replace the dustcap on A15U302.
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