Power Reference Oscillator Frequency Calibration - Agilent Technologies 53147A Assembly Level Service Manual

NOTES
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Chapter 2 Service
Calibration Procedures

Power Reference Oscillator Frequency Calibration

The internal power reference oscillator is used to calibrate the Power
Meter to the power sensor head. This adjustment calibrates the frequency
output of the power reference oscillator to 50.0 MHz ±0.5 MHz.
Equipment Required
Agilent 53150A Microwave Frequency Counter
Agilent 10503 series BNC (m) to BNC (m) Coaxial Cable
Agilent E9635A Type N (m) to BNC (f) Adapter
Small, non-metallic adjustment tool for slotted screw heads
The instrument and the test equipment must be powered on for at least
•
30 minutes prior to adjusting the power reference oscillator output.
This allows the internal temperatures of the equipment to stabilize.
• This procedure specifies the Agilent 53150A for measuring the
frequency output of the 53147A/48A/49A's power reference oscillator.
If the 53147A/48A/49A's Frequency Counter is known to be in calibration
(see "Test 1: Channel 1 Frequency Sensitivity" on page 1-18), you can
use it in place of the 53150A in this procedure.
Adjusting the power reference oscillator frequency may also affect the
•
output level of the oscillator. Therefore, after you adjust the frequency
to 50.0 MHz ± 0.05 MHz, always check the output level and adjust it,
if necessary, as described in "Power Reference Oscillator Level
Adjustment" on page 2-13.
Turn off the Agilent 53147A/48A/49A, and disconnect the power cord.
Remove the shroud from the Agilent 53147A/48A/49A (see "Removing the
Shroud" on page 3-7).
Position the Agilent 53147A/48A/49A on its right side so that you have
access to the front panel and the left side of the main circuit board
(see Figure 2-2).
Assembly Level Service Guide 2-9