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Adjustment Procedures
2715 Spectrum Analyzer Service Manual
5-39
Use the following procedure to adjust SW410 on the Reference Oscillator board:
H Test equipment required: 100 MHz Frequency Standard
1. Perform Internal Reference Frequency normalizations as detailed on
page 5--37.
2. When normalizations are complete, display reference normalization values by
pressing BKSP 4 6. Make a note of the CALIBRATOR FREQ value. Press any
menu button to return to the spectral display.
3. Start the Reference Frequency correction bit entry routine by pressing UTIL 5
242. Where the screen prompt calls for a new value, enter the value noted in
step 2, and follow thescreen prompts. See Table 5--4 for the correction bit values
for SW410. See Figure 5--14 for the location of SW410 on the Reference
Oscillator board.
SW410
1
8
OPEN
Figure 5- 14: SW410 on the Ref erence Oscillator Board
4. Turn power off and back on. Recall last power down settings by pressing
UTIL 1 0. Display reference normalization values by pressing UTIL5546.
5. Check that the CALIBRATOR FREQ value is 100 MHz, ±1.2 kHz.
6. Again, perform the Internal Reference Frequency normalization. as detailed
on page 5--37.
Table 5- 4: Correction Bit Values
Switch No. Value
7 20 Hz
6 40 Hz
5 80 Hz
4 160 Hz
3 320 Hz
2 640 Hz
1 1280 Hz
Setting of Reference
Frequency Correction Bits