Atec Agilent-8563E - Manual (Page 101)

Adjustments ESG Family Signal Generators
Internal Reference Oscillator Adjustment
5-4 Calibration Guide
Internal Reference Oscillator Adjustment
Use this procedure to adjust the internal reference DACs (Digital-to-Analog Convertors).
The internal reference oscillator is adjusted with two DACs, one for coarse tuning and one
for fine tuning. Using the two DACs, the internal reference oscillator can be adjusted to the
resolution of the frequency counter used.
This is a manual adjustment. An automated version of this adjustment is also provided.
Required Test Equipment
• HP/Agilent 53132A Option 050 Universal Counter
• HP/Agilent 5071A Primary Frequency Standard
Procedure
Figure 5-1 Internal Reference Oscillator Adjustment Setup
1. Connect the equipment as shown above.
2. Preset all of the equipment.
3. Set the universal counter input to 50
Ω.
4. On the signal generator press, Preset > Amplitude > 0 > dBm > RF ON/OFF > Utility >
Instrument Adjustments > Reference Oscillator Adjustment > Ref Osc Fine .
5. Center the fine tuning DAC setting for a value of 128.
6. Press Ref Osc Coarse on the signal generator.
7. Adjust the coarse tuning DAC setting for a universal counter reading of 100 MHz.
8. Press Ref Osc Fine and adjust the fine tuning DAC setting for a frequency counter
reading of 100 MHz, within 0.1 Hz resolution.
9. After adjusting both of the DAC settings, press Store Ref Osc Setting > Confirm Store .