7-23
Adjustments
Manual Adjustments
Time Base DAC (All 8648A/B/C/D)
NOTE A manual adjustment is available. This automated adjustment can be
replaced by performing the manual Internal Reference Oscillator Adjustment
instead.
Description
This adjustment determines the proper DAC setting to achieve a frequency reading of
1GHz ±1 Hz. The DAC settings are then stored away.
This program determines the proper DAC setting to achieve a frequency reading of 1 GHz
±1 Hz. The DAC setting is then stored away.
Required Test Equipment
•Spectrum Analyzer
• Primary Frequency Standard
Procedure
Figure 7-22. Time Base DAC Setup
1. Connect the equipment as shown above.
2. Preset all of the equipment.
3. Follow the instructions as they are displayed on the PC.
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