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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 t
his 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 50Ω.
4. On the signal generator press,
Preset > Amplitude > 0 > dBm > Frequency > 10 > MHz > 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 universa
l counter reading of 10 MHz.
8. Press
Ref Osc Fine and adjust the fine tuning DAC setting for a frequency counter reading of 10 MHz,
within 0.1 Hz resolution.
9. After adjusting both of the DAC settings, press
Store Ref Osc Setting > Confirm Store.
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