Model 10811A/B
SECTION V
ADJUSTMENTS
5-1. INTRODUCTION
5-2. This section describes the adjustments required to maintain the 10811A/B operating
characteristics within specifications. Adjustments should be made when required, such as after a
performance test failure or when components are replaced that may affect an adjustment.
5-3. EQUIPMENT REQUIRED
5-4. The test equipment required for the adjustment procedure is listed in Table 1-2, Recommended
Test Equipment. Substitute instruments may be used if they meet the critical specifications.
5-5. FACTORY SELECTED COMPONENTS
5-6. Some of the values in the parts lists are selected during manufacturing to meet circuit
requirements. These parts are marked with an asterisk (*) in the parts list and schematic diagrams, with
average value shown.
5-7. ADJUSTMENT LOCATION
5-8. Adjustment locations are identified in this section and in the component locators in Section VIII,
Schematic Diagrams.
5-9. SAFETY CONSIDERATIONS
5-10. This section contains warnings and cautions that must be followed for your protection and to
avoid damage to the equipment.
WARNING
MAINTENANCE DESCRIBED HEREIN IS PERFORMED WITH POWER
SUPPLIED TO THE INSTRUMENT, AND PROTECTIVE COVERS
REMOVED. SUCH MAINTENANCE SHOULD BE PERFORMED ONLY
BY SERVICE-TRAINED PERSONNEL WHO ARE AWARE OF THE
HAZARDS INVOLVED (FOR EXAMPLE, FIRE AND ELECTRICAL
SHOCK). WHERE MAINTENANCE CAN BE PERFORMED WITHOUT
POWER APPLIED, THE POWER SHOULD BE REMOVED.
BEFORE ANY REPAIR IS COMPLETED, ENSURE THAT ALL SAFETY
FEATURES ARE INTACT AND FUNCTIONING, AND THAT ALL
NECESSARY PARTS ARE CONNECTED TO THEIR PROTECTIVE
GROUNDING MEANS.
5-11. OSCILLATOR FREQUENCY ADJUSTMENT
5-12. The following frequency adjustment procedure is the same for both the 10811A and 10811B.
Allow the oscillator to warm up for 24 hours before making this adjustment. See Figure 5-1.
a. Connect reference frequency standard (multiple or submultiple of 10 MHz) to the EXTERNAL
SYNC INPUT of the oscilloscope. Adjust oscilloscope so that sweep is synchronized with
reference frequency.
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ACEC
