HP 3562A Service Manual page 335

MO D E L 3562A
Internal Signal Descriptions
± -6.2 R E F E R E NC E
+ 6.2R
T h i s is the analog d ig ital co nverter's track ing vo ltage refere nce ge nerated
- 6.2R
by the conversion DAe. I t provides the voltage refe rence for the A/D
converter, converter I C, the track and hold c ircu it, and the over range/half
range c i rcu it.
C L E A R ADC
C LADC
S i g n a l from the contro l l ing ADC contro l ler to the p rocess switch on each
board . I t works with G SW to dete r m i n e the i n put to each of the A/D con­
verte r I Cs.
CONTROL OUT
CO NTO UT
Control out is part of the connection between the A32 analog d ig ital
CO NTIN
converter board and A34 analog d igital converter board . This s i g n a l
determ i nes w h i c h board is in contro l . I f both boards are i nsta l l ed, A 3 2 is
in contro l .
E N D O F CONV E R S I O N
EOC
When both analog d i g ital converter boards are instal led, A32's contro l ler
te l l s A34's control ler it is done with a convers ion.
PROC ESS SW ITCH S I G N A L
GSW
Si gnal from the contro l l ing ADC contro l l e r to the p rocess switch on each
board . It works with C LADC to determ i ne the i n p u t to the A/D converter
I Cs. When both boards are i nstal led, the GSW is also u sed as an i n p u t for
tim i ng to the A34 ana log d igital converter's contro l l er.
LOCAL A/D CONVE RT
LC NV
The ADC contro l l er's command to the A/D converter IC to start conversion.
When both boards are insta l led, the LCNV signal goes to the A34 a n a l og
to d i g ital converter's A/D converte r
C I RC U I T D E SC R I PT I O N S
l e .
6-1 1 9/6-1 20