Analog; Poweron - Datron 1061 Calibration And Servicing Handbook

Pin No.
of M19
held
low
if
Option
incorPorated
M19-3
M19-11
M19-4
M
19-10
lD line low
tDl
tD2
tD3
tD4
Optiorr
checked
AC
c)
ï
RATIO
t
16
Fis.3.2
POWER-ON
OPTIONS FITTED
TEST
high on
M18-4,
turning the
opto-isolator M2'B
on and thus
COND. VAL (M2'8) is
high, signalling
to
the
Digital
assembly
that
the
AC
option
is
fitted.
Similarly.
when the
O,
I
or
RATIO options are
interrogated,
the
appropriate
output
of
l\419
is set
low
if
the option
is
fitted
causing
the
COND.
VAL to
be set
high.
*Note:
lD
and
lA
lines
logic'1'=
+5
volts
logic'0'=
0 volts
AD
lines
logic
'1'
=
0
volts
logic
'0'
=
--15 volts
The next step
in the power-up
sequence
as
far
as
the
analog circuits
are
concerned, is
to
be
placed
into the
DC,
1000V range (See
Fis.3.3
Flowchartl' Firstly,
all
assemblies
are deselected
by
placing
logic'1's
on
all the
lD
lines, then setting
the lAø and
lAl
lines
low
(see Fig'
3.41, clocking
the option
selects
latches
(M20
Analog
assembly,
M5 AC
assembly,
M9 Ohms assembly.
Ml
Ratio
assembly
from
M17'3.
Both
lA
lines
then return
high'
e
POWERON
SELECT DC
LOAD DC
.EET.'PATTERN
FOR 1OOOV
RANGE
RESELECT
DC
CHECK
IF
RATIO IS FITTED
AND SELECTED
DESELECT
ALL ASSEMBLIES
LOAD
D-A
WITH
DC
Ib
DAT
CHECK
IF
AC
IS
FITTED
CHECK IF
N
IS FITTED
CHECK IF
I
IS FITTED
DITION
PLACE
A-D
INTO
RESET
FIG.
3.3
ANALOG INTERFACE
SEQUENCE: POWER-UP
I
I
-'ì
tDo
lD1
L
o
õ
L- __-
_---J
ID
ID
ID
2
L
----øc
.9.9
- - -
-CO
€
t
'-J----l----
6----
:c
På:::-
J
L-_-_
co
o(J
õE
o.L
o:
oo
-J
tD5
tD6
tD7
tAl
IAø
L__
_
L_ ___
L-----_____
J
I
o
@
@
DC
Clear
all
r
Load
D-A
Select
Oplions I
Conve¡ter
I
l.+
+t0
p S
----->t<-
270
¡:S
__i+_
27g,
S+l
FIG.3.4
ANALOG
INTERFACE DATA LINE TIMING DIAGRAM
(POWER'UP}
fti'"'