Table 8-1. Temperature Set Resistor List - HP 10811A Operating & Service Manual

Quartz crystal oscillator

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Operating & service manual (65 pages)

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b. Crystal and Temperature Set Resistor: The replacement crystal for Y1 will be accompanied

by the required temperature set resistor (R20) for the oven. This resistor must be installed

with the new crystal. The crystal and R20 can be ordered using HP Part Number 10811-

60108. If the temperature set resistor is found to be defective only, it must be replaced with

the same value and tolerance. If the temperature set resistor (R20) is unreadable, the value

required can be determined by finding the oven temperature value marked on the crystal (Y1).

The required resistor can then be determined from

which secures it to the oven mass should be tightened to a torque of 44 newton-metres (5 in.-

Ibs.). This will insure maximum heat transfer without overstressing the crystal package.

c. 10811B Bottom cover: If any part of the 10811B bottom cover is found to be defective, the

complete bottom cover must be replaced (HP Part Number 10811-60107). Once the

insulating foam is attached to the bottom cover, feedthroughs and terminals cannot be

replaced without impairing the heat insulating abilities of the bottom cover. Do not attempt to

repair the cover or replace the flex circuit.

OVEN TEMP °C

80.0

80.1

80.2

80.3

80.4

80.5

80.6

80.7

80.8

80.9

81.0

81.1

81.2

81.3

81.4

81.5

81.6

81.7

81.8

81.9

82.0

82.1

82.2

82.3

82.4

82.5

82.6

82.7

82.8

82.9

83.0

83.1

83.2

83.3

83.4

83.5

83.6

83.7

83.8

83.9

84.0