HP 5061A

MANUAL CHANGES MODEL 5061A Page 14
CHANGE 10 (1936A) (Continued)
1
1852A01516
1904A01524
1904A01525
1908A01528
1908A01531
1908A01532
1908A01533
1908A01550
1908A01551
1908A01552
1908A01555
1908A01556
1908A01557
1908A01558
1908A01559
SERIAL NUMBER
1132A00560 or below
1220A00561 thru 1926A01583
1940A01584 or higher
C-FIELD DIAL RESOLUTION
1 X 10 — 12 per minor division
5 X 10-14 per minor division
8 X 10-14 per minor division
Page 8-31, Figure 8-18, A7 Schematic Diagram:
Change A7 from "SERIES 1244A" to SERIES 1936.
Add SERIES 1936 at top edge of A7A1 circuit board.
Add 22UF capacitor C24 in parallel with diode CR3. Connect negative side of C24 to CR3 anode.
Add 22UF capacitor C25 in parallel with diode CR4. Connect negative side of C25 to CR4 anode.
NOTE — The following instruments have SERIES 1936 assemblies for A7 and A9:
1840A01490
1840A01493
1840A01494
1840A01499
1852A01510
1852A01513
1852A01514
Change 42.82 kHz in paragraph (9i (b) to 53.53 kHz.
Page 3-11, Table 3-4, 5061A Operating Record:
Change ZEEMAN FREQUENCY to 53.53 kHz.
Page 4-1, Paragraph 4-4, Third Sentence:
Change 9,192,631,771.6 Hz to 9,192,631, 772.5 Hz.
Page 4-1, Table 4-1, Assembly Designations:
Change A1 Synthesizer to HP Part No. 05061-6158.
Page 4-2, Paragraph 4-23:
Change 12.6317716 in lines 2 and 6 to 12,631,772.5 Hz.
Change 771.6 in line 4 to 772.5 Hz.
Page 4-3, Paragraph 4-27, Last Sentence:
Change last sentence to read as follows: "To the synthesizer M=10305 and N=4079 giving an output frequency of
12,631,772.5 Hz. ”
Page 4-4, Paragraph 4-34:
Change paragraph to read as follows:
4-34. The jumper wires program the inputs to preset decade IC1, IC2, IC5, and IC6. For example, IC1 input is
programmed for a BCD of 1, IC1I4) is HI and IC1(3, 10, 11) are LO. IC1 requires positive logic levels at its preset
inputs. Therefore, the HI level at pin 4 represents the BCD 1.
Page 4-4, Figure 4-4, A1 Timing Diagram:
Change "PRESET NUMBER ” from 8634 to 5921.
Change numbers "8635", "8636 ” , "8773", and "9988 ” to 5922, 5923, 5924, and 5925 (respectively).
CHANGE 11 (1940A) STANDARD INSTRUMENT
Page 3-2, Figure 3-1, Front Panel Controls:
Change frequency resolution for item "10. C-FIELD control:" from 5 X 10-14/minor division to 8 X 10-14/minor
division.
□ Page 3-4, Figure 3-3, Rear-Panel Controls:
Change synthesizer output frequency in "6. ” to 12,631,772.5 Hz.
Page 3-7, Paragraph k., C-Field Adjustment:
Change Audio Oscillator frequency in step k.(5) from 42.82 kHz ±50 Hz to 53.53 kHz ±50 Hz.
Page 3-8, Paragraph 3-14, Step k continued:
Change audio oscillator output in Figure 3-5 to 53.53 kHz.
Change second paragraph of NOTE ibelow step k.(7ll to read as follows:
When correctly set, the C-FIELD dial will read between 4.0 and 6.0 (applies only to instruments with Serial
Number 1220A00561 or higher). C-FIELD dial resolution for instrument with difference serial numbers is given in
the following table: