HP 10811A, Operating & Service Manual

Page: 12 / 73

Model 10811A/B
4
1-12. For information concerning a serial prefix that is not listed on the title page or in the Manual
Changes supplement, contact your nearest Hewlett-Packard office.
1-13. DESCRIPTION
1-14. The HP Model 10811A/B Quartz Crystal Oscillator is an extremely stable, compact, low power
source of 10 MHz. The 10811 A/B has a very fast warm-up time, exhibits excellent temperature
characteristics and has low phase noise and power consumption.
1-15. The 10811A/B has the ability to be adjusted over a range of 20 Hz (2 X 10
-6
), yet the control is
sensitive enough to allow adjustment to better than 0.1 Hz (1 X 10
-8
). The frequency can also be
controlled electronically over a 1 Hz (1 X 10
-7
) range with an externally applied voltage to the EFC.
1-16 The 10811A/B is field repairable, thus allowing the oscillator to be quickly placed back into
service.
1-17. The 10811A/B requires two external power supplies. The power supply requirements are listed in
Section II.
1-18. The 10811A and 10811B are identical, except for the connections. The 10811A uses a standard
15 pin printed circuit connector. The 10811B uses filtered-feedthrough terminals for power and
oven monitor, and 5MB subminiature rf snap-on connections for the 10 MHz output and EFC.
1-19. HP Part Number 10811-60101 and 10811-60105
1-20. The 10811-60101 is a 10811A in which phase noise, magnetic field and 2g turn-over are not
specified. The 10811-60101 is physically identical to the 10811A.
1-21. The 10811-60105 is a 10811-60101 with specifications of <1.5 X 10
-9
for aging and <1 X 10
-11
for
short-term stability for a 1-second averaging time. The 10811-60105 is physically identical to the
10811A.
1-22. RECOMMENDED TEST EQUIPMENT
1-23. The test equipment required to maintain the Model 10811A/B is listed in Table 1-2 . Other
equipment may be substituted if it meets or exceeds the critical specifications listed in the table.