HP 3562A Service Manual page 358

MOD E L 3 S62A
RESETL
R F D L
SAMP
SG N D
S I N E
SMPO UT
SRCO U T FALTL
SRQ
R E S E T
Active Low
This s ignal resets the i n stru ment. The i n stru ment is reset by the A2
System C P U at power-up, when the reset switch A2 S1 is pressed , or
by a software reset. R E S E T L goes to every assembly except the
AS D igital Fi lter, the A1 7 D i s p l ay I nterface, the A1 8 Power Su pply,
and the A22 H P-I nterface bus.
READY FOR DATA
Active Low
The A1 7 Display I nterface sends the A8 G lobal RAM th is control s ignal
when the HP 1 34SA is ready for data. RFDL works with DAVL (d ata
ava i l able) to tra nsfer data to the H P 1 34SA d isplay. Refer to the
HP 1 34SA service m a n u a l section 3-6 for the handshake t i m i n g
i nformati on.
SAM P L E
(A32, A34 T P608; A1 T P8)
This is the s ignal from the A34 ADC 2 to the A1 D igital Sour.ce assem b ly
sayi ng a s a m p l e has been taken.
S I G NA L G RO U N D
(A33, A3S ] 300-2)
A1 2 Mother A s se m b ly grou nd; con nected to a l l the assem bl ies.
S I N E
(A4 T P23)
This i s a d igital s i gnal from the A4 Local Osc i l l ator to the AS D ig ital
Fi lter. When i n a freq uency s h ifting mode this signal represents a s i n e
s ignal . When i n the real mode, S I N E corresponds to 1 + jO.
SAM P L E OUT
(A1 8 ) 1 -1 2)
The 256 k H z c l oc k from the /\31 Trigger to the A 1 8 POvVer S u p ply.
This s i g n a l i s u sed to synchro n i ze the pu l se width mod u l ator on the
-
(A30 J 200)
T h i s is the A30 sou rce output to the front panel.
SOURCE OUT FAU LT
Active Low
Signal from the A30 Analog Source to the A1 D igital Sou rce. This signal
goes low when the output of the sou rce is greate r than 12 volts .
S E RV I C E RE Q U E ST
Signal to and from the A2 System C P U to the A22 H P-I B. T h i s l i ne i s
set low by any i nstrument req uesting service.
C I RC U I T D E SC R I PT I O N S
6-1 4 3