HP 5061A

MANUAL CHANGES MODEL 5061A Page 2
ERRATA (Continued)
the battery will charge for 13 to
are transposed.
on during the charge cycle.'
Page 6-28, Table 6-1, Replaceable Parts:
Change HP and Mfr Part Number for KIT:RACK MOUNT from 5060-0777 to 5060-8742.
Page 6-18, Table 6-1, A11 Replaceable Parts:
Change A11A1R33 and R34 to 0811-3288; R: FXD WW 0.025(1 10% 2W; 28480; 0811-3288.
Page 8-45, Figure 8-25, A11 (05061-6009) Schematic Diagram:
Change values of A11A1R33 and R34 to 0.025 ohms.
Title Page (inside front cover):
Change paragraph under “ SERIAL PREFIX: 1740A ” to the following:
This manual applies directly to HP Model 5061A Cesium Beam Frequency Standards having Serial Prefix 1740A.
Page 3-7, NOTE following paragraph 3-14. c:
Change second sentence to: "Thus, when the instrument is initially turned on,
18 hours and the BATTERY light will be on during the charge cycle. ”
Page 5-40, Paragraph 5-234, fifth line:
Change "A15R30 and A15R31 ” to A15R33 and A15R34.
Page 5-40, Paragraph 5-236, second and third lines:
Change "P+50V)" to "(=50V) ” .
Change "A15R30 and A15R31 ” to A15R33 and A15R34.
Page 5-40, Paragraph 5-239:
Change to the following:
If assembly A19 is replaced, resistors A15R33 and A15R34 on Power Regulator Assembly A15 must be changed.
Refer to paragraph "5-186. ELECTRON MULTIPLIER VOLTAGE ADJUST (A15R33, A15R34). ” for procedure.
Page 5-41, Paragraph 2-254, second line:
Change sixth word to “ operating ” .
Page 5-43, Paragraph 5-260, step c:
Change “ 18 to 21 ” to "13 to 18 ” .
Page 5-43, Paragraph 5-260, step d:
Change "bread ” to "lead ” .
Page 5-43, Paragraph 5-262:
Complete second sentence to read as follows: “ To isolate the the trouble circuit, perform following checks
in order given: 1) Timing Oscillator (Paragraph 5-268), 2) Decades (Paragraph 5-271), 3) Reset Preset (Para 
graph 5-267) and 4) Logic Comparator (Paragraph 5-269). ”
Page 6-33, Table 6-3, Option 001 Miscellaneous Replaceable Parts:
Change 05061-6061 to W26; 05061-6104; CABLE ASSY: FREQUENCY DIVIDER; 28480; 05061-6104.
Add in "Reference Designation ” column.
W27 for 05061-6062 cable assembly.
W31 for 05061-6068 cable assembly.
W32 for 05061-6069 cable assembly.
Page 8-11, Figure 8-9, Al Schematic Diagram:
Reference designators for C31, C32; CR36, CR37; and R72, R73 ;
Change C31 to C32 and C32 to C31.
Change CR36 to CR37 and CR37 to CR36.
Change R72 to R73 and R73 to R72.
Delete A1C39 capacitor (2500 pF) in the drain circuit of FET Q3.
Page 8-53, Figure 8-29, A16A1 Schematic Diagram:
Add "CR4 ” label to diode between U2 and CIO in A16A1 component locator illustration.
Change A16A1 schematic diagram by transposing A16R14 and A14C12. Capacitor C12 connects between
U2(9) and one end of R14. The other end of R14 goes to circuit board common.
Remove connection between A16A1Q3 collector and A16A1U2 pins 11 and 14. Add connection between cir 
cuit board common and A16A1U2 pins 11 and 14.
Page 6-33, Table 6-3, Option 001 Replaceable Parts:
Add A5; 05061-6118; MODULE ASSY: DIGITAL DIVIDER.
Page 6-30, Table 6-2, Option 002 Replaceable Parts:
Change "Description ” for BT1 to BATTERY 24V 2.2A-HR NI-CD WITH FLEX LEADS; 28480; 1420-0053.
Page 8-19, Figure 8-13, A5 BLOCK DIAGRAM:
Change A5 DIGITAL DIVIDER ASSY part number (top of diagram) from 05061-6011 to 05061-6118.
Change A5A1 POWER SUPPLY part number from 05061-6015 to 05061-6114.