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Model 5065A
Circuit Diagrams, Theory, and Maintenance
Table 3-3. Frequency
1. Remove instrument top cover and note setting of
TIME SCALE thumbwheel and position of HI-LO
switches. Record this information in Item 1.
NOTE
Be certain to include the correct algebraic
sign (+ or-) with the numbers used in the
following calculations.
2. Locate thumbwheel switch setting in Table 3-7
and record the corresponding Offset X10-
1 0
value
in Item 1 under Offset (X 10-10).
3. Record the desired change in offset under Item 2
in the space provided.
4. Algebraically add the sum of Item 1 and Item 2
(Offset x 10-10) and record the total in Item 3.
5. Locate the nearest Offset X 10-10 in Table 3-7 that
corresponds to the total offset recorded in Item 3.
Record this offset, its corresponding TW switch
setting, and HI-LO switch setting under Item 4 in
the appropriate spaces provided.
6. Algebraically subtract Item 4 from Item 3 and
record this remaining Frequency Offset in Item 5.
7. Divide the remainder recorded in Item 5 by 2 and
record the answer in Item 6.
NOTE
The division in Step 7 is performed to con
vert the frequency offset to be corrected
by MAGNETIC FIELD ADJUSTMENT
into front panel MAGNETIC FIELD con
trol setting.
8. Note present front panel MAGNETIC FIELD con
trol setting and record this setting in Item 7.
L
3-6
Change Instructions
9. Algebraically add the new MAGNETIC FIELD
control setting from the setting recorded in Item 7.
Record this total in Item 8.
NOTE
If the addition performed in Step 9 gives a
negative number or a number greater than
10, the synthesizer setting selected in
Item 4 must be changed. Select the adja
cent offset from Table 3-7 closest to total
offset recorded in Item 3, and record this
new information in Item 4. Repeat Steps 5
through 9 using the new data. (See
example, Table 3-4.)
10. Record Item 4 and Item 8 information in spaces
provided under Item 9.
11. Set Synthesizer Assembly A1, TIME SCALE
thumbwheel switch to the new setting recorded
in Item 9a.
12. Set Synthesizer Assembly A1, HI-LO switch to the
position recorded in Item 9b. Replace instrument
top cover.
13. Adjust front panel MAGNETIC FIELD control to
the setting recorded in Item 9c. Then perform
Frequency Offset and Calibration (paragraph
3-10) again to align the 5065A with the reference
standard.
14. Set front panel CIRCUIT CHECK switch to CON
TROL and slowly adjust OSC FREQ COARSE
control for CIRCUIT CHECK meter indication
of "0".
15. If CONTINUOUS OPERATION lamp is off, wait 2
minutes, then momentarily press front panel
LOGIC RESET button. CONTINUOUS OPER
ATION lamp should come on and stay on. The
5065A offset has been changed and the instru
ment is operating normally.
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