Tektronix 2715 Setting of Reference Frequency Correction Bits

Adjustment Procedures
2715 Spectrum Analyzer Service Manual 5-39
Use the following procedure to adjust SW410 on the Reference Oscillatorboard:
HTest equipmentrequired: 100 MHz Frequency Standard
1. Perform Internal ReferenceFrequency normalizations as detailed on
page 5-- 37.
2. When normalizations are complet e, display reference normalization val ues by
pressingBKSP 4 6. Make a note of the CALIBRATOR FREQ value. Press any
menu button to return to the spectraldisplay.
3. Start the ReferenceFrequency correction bit entry routine by pressing UTIL 5
242. Where the screen prompt calls for a new value, enter the value noted in
step2, and follow the screen prompts. See Table 5--4forthe 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 Reference Oscillator Board
4. Turn power off and back on. Recall last power down settings by pressing
UTIL 1 0. Display reference normalizationvalues by pressing UTIL5546.
5. Check that the CALIBRATOR FREQ value is 100 M Hz, ±1.2 kHz.
6. Again, perform the InternalReference Frequency normalization. as detailed
on page 5--37.
Table5 -4: Correction Bit Values
Switch No. Valu e
720 Hz
640 Hz
580 Hz
4160 Hz
3320 Hz
2640 Hz
11280 Hz
Setting of Reference
Frequency Correction Bits