TM 9-4935-601-14-7&P
Model 8640B
CHANGE 25 (Cont'd)
A9 Assembly Removal Procedure (cont'd)
11. Reinstall switch assembly by setting both switches four positions ccw from full cw (the Divider/Filter shaft should
also be in this position) and by reversing the procedures in steps one through ten.
NOTES
The detents of both A9 and A10 assembly switches must align and correspond to the same
positions. Check that the actual RF output frequency agrees with the counter indications on all
bands.
Adjust the coupler for minimum binding and tighten the setscrews very securely.
CHANGE 26
NOTE
See paragraph 7-93 for recommended instrument modification.
Page 1-9, Table 1-1:
Under SPECTRAL PURITY, make the following changes to the Harmonics specification.
Delete >35 dB below fundamental of 0.5 to 128 MHz.
Change "128 to 512 MHz" to "0.5 to 512 MHz".
Page 1-10, Table 1-1:
Under MODULATION CHARACTERISTICS , General, make the following changes to the specification for
Optional:
(Internal Variable Audio Oscillator, Option 001).
In the Frequency specification, change ±10% to ±15%.
In the Total Harmonic Distortion specification, change "600 kHz" to "200 kHz", and add the following:
"<2.0%, 200 kHz to 600 kHz"
Pages 4-11 thru 4-13, paragraph 4-17:
Under SPECIFICATIONS, make the following changes:
Delete >35 dB below fundamental of 0.5 to 128 MHz.
Change "128 to 512 MHz" to "0.5 to 512 MHz".
Change 35 dB to 30 dB in steps 2, 3 (two places), and 4 (seven places).
Pages 4-44 and 4-45, paragraph 4-30:
Under SPECIFICATION, make the following change to Option 001, Frequency.
Change ±10% to ±15%.
In step 4, change ±10% to ±15% (two places).
Pages 4-45 and 4-46, paragraph 4-31:
Under SPECIFICATION, change "600 kHz" to "200kHz" and add the following:
"<2.0% 200kHz to 600 kHz".
In step 2, change "600 kHz" to "200 kHz" and add the following:
"200 kHz to 600 kHz,______________ <2.0%"
Page 4-78, Table 4-1:
Under paragraph number 4-17, change 35 dB to 30 dB (eight places).
Page 4-81, Table 4-1:
Under paragraph number 4-30, change ±10% (in Max column) to ±15%
Under paragraph number 4-31, change "600 kHz" to "200 kHz", and add the following:
"200 kHz to 600 kHz,_______________2.0%".
7-72
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