Datron 1061 - AC Assembly (Option 10)

55
CAUTION
The
following
procedures
should
commence
with
the
HF
Autocal
vottage
close
to-the
center
of
its
span'
To
check
this,
select
the 1OoV
RC
range
and
measure
the
DC
voltage
at
J1'11
with
respect io fpS.
lf
it
is
between
+4V and
+6V,
it is
NOT
necessary
to
clear
the
calibration
stores'
lf
outside
these limits, the
cal
stores
should
be
cleared
as
described
in
para
4.3.1
operatie¡5
(13),
(1a)
and
(151'
CLEARING
THE
CAL
STORES
ENTAILS
A
FULL
,AUTOCAL'
OF
THE INSTRUMENT!
Before
proceeding;
ensure
that
at leastthe
Analog
Assembly
LIN and
I5 Autocalibrations
have
been
carried
out'
AC Preamplilier
Ze¡o
1.
Read
and
comply
with
the
CAUTION
above
2
Apply
short
circuit
input. Select
AC
+
DC,
100mV
range
and
HOLD.
3.
Connect
DVM
Lo
to TP8,
Hi to
Test link K
(TLK).
Adjust
R148
(bias
current)
for
a reading of
zero,
*140pV.
Select
100mV
range
AC,
and check that the reading
is
zero,
*140¡¡V.
lt may
be
necessary
to re-adjust
R149
to
obtain
this
value. lf
so, recheck
operation 3.
Select
each
range
in turn,
and
check
that
the DVM
reading
is within
*70¡¡V of
zero
(except
100mV
range:
*140¡¿V).
Set
up RMS
Converter
Select
10V
range.
Adjust
Rl19
(Rectifier
zero)
for
the most
negative
(or
least
positive)
reading
on the
display.
Connect
DVM
to TLH.
Adjust
R101
(linearity)
for
a
reading of
+1.1mV410%.
Select
100mV
range.
Check
that
the DVM
reading is
between
0.8mV and
1.8mV.
Select
1V
range
and
apply
lV,500Hz, w¡th
the
DVM
still
connected
to
TLH.
Remake links
TLC-TLF.
Then
after
recording
the
TLH voltage,
refer
to
Fig.
4.2
and
cut
the links
(z)
as appropriate
to
give
a
DVM
reading
of
3.'tS7V
*0.010V.
Check
Spec
Readout
Frequency
Flags
10.
Select
HOLD.
Connect
DVM
to TP6'
Adjust
the
applied
frequency
and
note
that
TP6
changes
logic
state
at
a
frequency
between
1'8kHz
and 2'2kHz'
Disconnect
the
DVM.
I
4.3.4
OPTION
t2
AC
Assembty
Equipment
Required:
:
i
'j
[?itîîil';
r';*:: J;
]ï
:f;'
iå
u'ul
%
u'
DC
calibrator.
e.g.
Datron 4000
or
4000A.
AC
calibrator.
e.g.
Datron
4200.
R'v'..tiiJ'
:ü;-iî"
Fiüél'
c"',
Factor
5:
1
*o'o2o/o'
reversible
polarity.
4.
5.
6.
Set
Range
'Zetot'
11.
Deselect
HOLD,
and
apply
500H2
atO"lo/o
FR input
to
each
range
in
turn.
Perform
ZERO autocal on
each
range,
using
the
instrument
display
to check that
ua"h
tungt
calibrates
to
100
digits
*3
digits' Dis'
connect
the
inPut.
12.
Apply
a
short
circuit
to
the
input, short
Guard to Lo
and
select
each
range
in
turn' Check
that the reading
on
each
range
is
zero
*10 digits
on
the display
(except
100mV
range
*30 digits).
Remove
the shorts'
7
8.
Gain-
1.090
1.084
1.078
1.O72
f
.065
1.059
f .oil
1.O48
1.M2
1.036
1.031
f .025
f .018
1.O12
1.006
1.000
Cut Test
Links
F
x
X
x
x
x
x
x
x
E
x
X
x
x
x
x
x
x
D
ta
x
x
x
x
x
x
x
x
c
x
x
X
x
x
x
x
x
TLH Voltage
2.887
-2.904
2.904
-
2.920
2.920
-2.937
2.937
-2.9æ
2.954
-
2.973
2.973
-2.988
2.988
-
3.004
3.004
-
3.021
3.021
-
3.038
3.038
-
3.055
3.0s5
-
3.071
3.071
-
3.090
3.O90
-
3.1
10
3.tÎ0
-
3.128
{
3.128
-
3.147
3.147
-
3.167
'lncrease
in
TLH
voltage
when
links
are
cut.
FIG.4.3
OPTION
12
AC
ASSEMBLY
OUTPUT
SE
LECTION
VOLTAGES