Power Reference Oscillator Frequency Calibration - Keysight Technologies 53147A Service Manual

2 Service

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
Keysight 53150A Microwave Frequency Counter
Keysight 10503 series BNC (m) to BNC (m) Coaxial Cable
Keysight 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
NOTE
– This procedure specifies the Keysight 53150A for measuring the frequency
– Adjusting the power reference oscillator frequency may also affect the output
1 Turn off the Keysight 53147A/148A/149A, and disconnect the power cord.
2 Remove the shroud from the Keysight 53147A/148A/149A (see
3 Position the Keysight 53147A/148A/149A on its right side so that you have
62
30 minutes prior to adjusting the power reference oscillator output. This
allows the internal temperatures of the equipment to stabilize.
output of the 53147A/148A/149A's power reference oscillator. If the 53147A/
148A/149A's Frequency Counter is known to be in calibration (see
Channel 1 Frequency Sensitivity"
53150A in this procedure.
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"
Shroud" on page 96).
access to the front panel and the left side of the main circuit board (see
Figure 2-2).
Keysight 53147A/148A/149A Assembly Level Service Guide
on page 31), you can use it in place of the
"Test 1:
on page 66.
"Removing the