BRUEL & KJJER
Nrerum-Denmark
Digital Circuit
2230.3
Description
The
DC
Output
from
the
Analog
Circuit
is
fed
to
the
A/ D
Convert-
er
V1
08.
The
Converter
works
as
a
Successive
Approximation
Converter
which
means
that
the 1
of
the
10
bits
output
is
set
when
the
DC
voltage
is
higher
than
the
half
of
the
Converter
voltage.
Next
bit
is
set
if
the
voltage
is
higher
than
the
upper
half
of
the
half
voltage
and
so
on.
The
Microprocesso
r,
which
has
8
inputs,
first
ask
for
the
two
M.
Sign.
bit
and
store
then
in
the
RAM
V114. Then
the
eight
L. sign.
bits
are
transfered
to
the
RAM
.
The
result
is
calculated
with
a
speed
of
128
calculations
in
a
second.
In
the
calculation
the
Data
from
the
Latch
Buffer
V1
07
are
used
as
wel
l,
telling
the
A
ttenua-
tor
positions
and
the
po
si
tion
of
the
Display
Switch.
Then
the
result
is
fed
in
se
rial
to
the
Display
Dr
iver
and
to
the
Display
. The
Display
column
is
updated
64
times
in
a
second
and
the
Digit
s
every
second.
The
ROM
V115
contains
th
e
program
used
for
the
Micro
Processor
,
and
the
Controller
V113
controls
the
Reset
,
Error
and
Battery
conditions.
4.83
Valid
from
se
rial
no.
1
028340
3-1
1-
120
110
100
90
80
70
dB
FS
O
I
.
---
·
--
~
-
.
---
· - ·
--
·
--·---
1
I
I
nput
Amp.
Filter
Output
Amp
.
Detector
I
·-
1
I
I
I
I
DC
Amp
.
2.2
V
DC
I
R e
f
~
T
es
t
Op
erate
I
---------------------------------
--------
----------
L-
---
-4
.6
1
I
...,~
....:~
p
103
5m
s D D D
__
OV
~
I
~
DB
A I 0
CONVERTER
CALC
UL
AT
IO
N
RAM
PROGRA
M
ROM
V
REF
I
I
I
I
I
I
o-g
~
10
::::;:;-
19
;:::::===;-r==============:;:::
~
1f
,-r========
;
=======
:r
::::;.,l}
D->~c~>~~~
i
r---r---------~------------~
A
I
N
!
>
I
l
In
put
Overload
Output
Overload
L_
_
__J
FSO
Adder
Sw
it
ch
~
110dB +
2
0dB
I
I
Analog
Circuit2230.2 j
--·-f--
· - · - ·
--
·- · - ·
-·-
·-
I---
ERROR
OE
T.
I
I
I
I
I
I
I
I
I
I
I
" 0 110"
STRT
V1
08
DB
DB
~rz
o
F~
211
rz
5
H
BEN
L BEN
6.8.11
.
13
""'
""
"\_
CS
!oo
1
t-
5
----.!.,_--
-1
18
CEO
MA
~
v
111
.___
M
....,
W
....,.
R
.,---
0
..,.-_
4
__
MR
T"
O...,.--J V
11
4
17
16
111111
I
Ill
o
v-
35
M
WR
lO
I
7
MR
O
MRO
l
MA
0·7
19
MUX
v 1
15
)"
A -
111
v 112
0
)
0 B 0·7
~=::=::=::=::=::::::::....::::=::=::=::=::=::=::=::1
~
-~
000
==::=>t
F
1
-
4
3,5,7.
9,
12,
14
,1
6.18
8-
15
EF
0.
4
Micro P
ro
cessor
~
NO
~
N
~
1
ri
NZ
~~
T
P
~
A
~~
T
;
P
~
B
~------~
CI
T
oc
~
k
~~
X
~
·
T
t
a
~
I
~
2
~
-
4
~
C
~
I
e~a~
r
~
I
N
~
T
~
2,4
.1
5.17
iG
2G
r9
18
1
17
34
33
ro
L...
39
:::::;
3
36
j<'
'--:~
1
;--'+:
1
~
9
V
1
O
7
2 3
+ 4 y 1 ·
~
1
1
NO
N1
N2
·-
A
LATC
H B
UF
F
ER
A
~,........
I 8
1------J
M
10
1
2.097152 M
Hz
I
I
I
I
I
I
I
I
I
I
+
5V
I
T
0
0
N 1
10
DI
SP
L
AY
~
!lJJn
...---
ZE
0404 - J -,,U
c -v 111
1
.:::=---
C
LK
-
V1
11
r+
I
I
2
h
1
~
5
__________________
~
---1
Bms
r--
I 7,6
______________
~~
c
I + 5V
'9
1
...-
--+1
Bms
t-
3
T-
CLK
to
ZE
0
404
: I I I
~
~
~::~
Jt
o
AIOConv.
I
_L.
__
J·-.,---'-·-O
V
6
~
STRT
V1
08
1
~
V110
/ 1 10
1
'1\
5
v
11
1
1 s
13
14
Load
/
3
2M
E F
Cl
ea
r
IN
T
--i
15ms 1--
ll_jl
ov
/
I
I
I
I
I
I
I
I
I
I
I
I
I
+5V
.---------<l
N
,_
IO
;-t
l
h.a
~
:
..
1..
:
~
E-R-R-OR
32Hz
f---
15
I
I
I
I
I
I
-
z
101
Contro
ll
er
·
~~-t---.----T-----7--------------------
---
---------------
~
~
1
Batt
:
13
I I I 2 1 5
-B
R
ese
t2 R
eset
1
I I I I
~_,~1
6
----
..
17
~-------------r--~~~~~
....
I
v
11
3
1
1
I I I
N103
I I
I I I I I
I I
1 1 I 1 I
--.-o
I 1 I 1 I
: - I I I I
I I I z z 0187 I I I
--i
---------
L
--
+-
-
---------
I_--
1---
-------
I I I I
I_ - - - - - - - - _ I - -
-1
-
--
- - - -
--
- - - - - -
----
-
_J
l I I
1 I I
1 1 S
EL
u
I I L e q
1
~
I
mpulse
MAX
P
eakn
Fast
MIN
RMS
~
Slow
SP
L
...
0
0
DETECTOR
T
IM
E
DI
SP
LAY
SW
I
TCH
W
EIGHTI
NG
..
YVY
.1.
+5V
L_j"'
N107
N
10
8
~~
I
I
I
I I
CON
T
ROLLER
------
-----
- ~
---
-
--+-
--
- ·
-·-
·
--,
I .
Power
I
Supp
ly I
I
Ana
l
og
Circu
it
2230.2
1
--
-.
---·
-·-
1 I
I
I
.I
I
A
ll
~
MAX/ MIN
Pause
I
I
I
I
~
RESET
I
I
I
I
I
I
__
___
____
z ~ o
2_8
~
Di
gital Cir
cu
it 2230.3
To Next Page
Loading...
