HP 8112A, Operating, Programming And Servicing Manual

Page: 350 / 406

Change 22
Change 23
Change
24
Change 25
For instruments with serial number 2343G02330 and lower.
Changes in component sourcing required several changes to the
parts lists. Because the changes did not affect the manual or the
performance of the instrument, they are not detailed here.
For instruments with serial number 2343G02380 and lower.
Changes in component sourcing required several changes to the
parts lists. Because the changes did not affect the manual or the
performance of the instrument, they are not detailed here.
For instruments with serial number 2343G02555 and lower.
This change introduced ferrite beads (1514 and 1515) on the base of
Q400 and the collector of Q402 respectively. The change is associated
with change 18 and was found to ensure more stable performance
when the dual transistor type was changed.
For instruments with serial number 2507G02630 and lower:
A new microprocessor board (081 1 6-66533) was introduced which
gave improved jitter and standard setting characteristics. See change
41 for more information.
Make the following changes to the appropriate parts-lists:
Instrument
In Appendix A, Table A-2
modify :
Reference Description HP Part #
AO 081 1 2 A3 BD AY-MICROPROCESSOR 081 1 6-66523
Microprocessor Board
In Appendix A, Table A-5
delete :
Reference Description
HP Part #
A3 081 16-66533 W5 Resistor
zero n 8159-0005
B-1 6 Backdating