EG&G 113 - DC Zero Adjustment

I
1
I
To do zero adjustment,
place
both coupling
switches
in
the
ground
position,
set
the L.F.
Rolloff switch
to DC,
+80
.
-
and
set
the gain
switch
to the position
to be used.
Then
~
adjust
the
front-panel
zero potentiometer
for 0 V
at the
+10
i iii"
'*°
output.
l
ix
|
+60
i
V i i
'30
3.9
DC
ZERQ ADJUSTMENT
l
I
..
i 1/
l.O
O6
F Eout
O
I O
+20
l as 1
l i
-70
TOTAL
GAIN
=
GAIN x
Fgq
x
}-Ee°i'-i
Ell‘!
Lp
Ell’! Hp
+|Q
ML.-. i
.1
.
-80
||l
|i
:1
il
ll
2
I
Ind
-I
'4I
AII
I—
)
LEAD
+
OI
o
J__
via
oo
EESLAG
oscnezs
+
3!
Q
E
oscn
+30
1
2-
~ . ,4
» 1-»
-T »
~60
ii I
.
l
.1
__
.
Q
.
l.
. ,l_l
i
-90
Ol
.lO
l.O
l0.0
IO0.0
IIIIIIIIIIIIIIIIIII
f
f
T
-- 0.
--
IIIIIll||IIIIln||
f me Mme
L
'
(READ
LEFT
DEGREE
SCALE)
(READ
RIGHT DEGREE
SCALE)
0,3
i_--'"|i1—---in
tom.
Pans:
= ALGEBRAIC
suu
or
HF
a
LF PHASE
ANGLES
lllllii
_
\-
' -1
-
-
‘s
II
II
SDcF"FF“liF||||lm|
IIIII
I
I
ll
__ll
6
‘HF
sue
LIIIII
||III'nn|
_--
_---II
_I---I
IIIIII
.llII
_--I
__—-
iiii
--I
II-I
IIII
_-
I
I
i
V
I1|
|ll
III
III
:::
_-II
iiii
||||
llII
IIII
::::
-III
——II
l0.0
L.__i____________
____.
Figure Ill-3. LP FILTER
NORMALIZED
AMPLITUDE
"TRANSFER CURVE
i i
Figure
Ill-5.
LP/HP FILTER
NORMALIZED
PHASE
TRANSFER
CURVE
.._.........
"-—-——_————-1
--It
T '
—IIIIl—II_II§l!—II-IIIII
I40
as
.
.
._ _
-IIIII_---IIII|._---IIIII
» ,
_IIIIl:-I_IIIIlilI_IIIII
_IIIIl——I_IIIIl—I§:!lIIl
I00
l3OdB _
I20
dB
NdB
" lOdB
REJECTON
O68»
_
commonMODE
w6
O68
aoaai
- ~
-
:01
2 5
io‘ 2
5 io‘
2 5
io° 2
5 io°
FREQUENCY
IN Hz
S
III
ll
-11-IIIIl—IZ-III
I
_-I_IIIII__'l_III
I
Illl I I I
E!!!!::::2:4!!:‘
_—--IIIIl'I—--
IIIIII_II!=l
I-IESIII -
_ I-IIIIl_-
. O.
I
ill
N
*III
III
IIII
IIIII
IIIIII
-EIEEIEIB
Oll|l‘ll'
IIIIIIII
IIIIII
IIIII
IIII
ll|l|IIIIl|l|iIII::'-all
—‘
Figure Ill-6.
TYPICAL
COMMON
MODE
n|||IIIInuiIw.--nun
Illl||IIIIIll||I'IIIl|l||
REJECTI
ON
CHAR
ACTE
R ISTICS
I-=iiIiIII===iIiIl—.‘-iiiiii:
°~8 IIIIIIIIIIIIIIIIMIIIIIIun
'
IIIInu||IIIIIln|rII-Innu
IIIIIIIIIIIIIIIIIIIIIIll|||
IIIIn|||IIIIIllnII-cum
O 6 IIIIIIIIIIIIIIIIIIIIIIlln
i
i II=::::::II=:'§::i--'
E 9”’ IIIIIll||IIII,:|l
E in Hp
IIIIl||||IIIIAll
0,, IIIIIIIIIIIIIAIII
gggg
3.10
MAXIMUM
INPUT SIGNAL
CONSISTENT
::::
WITH
LINEAR
OPERATION
nu
IIII
iii!
-
- -
-
nu
When
speaking
of the maximum
input
that
can
be applied,
a
distinction
must be
made between
common
mode signal,
:::
that
signal
which
is
common
to and
identical
at both
the
A
"'
and
B
inputs, and
differential
signal,
that
signal
which
exists
'°°
between
the
in
ut th
t ' th t'
m
ed t
n 'n
ut
T__'
'-
ps,
ais,ais
easur
aoeip
U3“
with
respect
to the
other.
A
perfect
amplifier
responds
not
at
all to common
mode
signal, that is,
if
both
the
A
and
B
inputs
are
driven by
the
same
large
signal,
no trace
of
that
Figure |||_4_
HP HL-I-ER
NQRMAUZED
signal should appear
at the
output. The
signal
at the
output
AMPLITUDE
TRANSFER
cunvE
should
result
from
the
differential input signal
only.
Real
Ill-4
;
l
3.9 DC ZERO ADJUSTMENT
To do zero adjustment, place both coupling switches in
the ground position, set the L.F. Rolloff
switch to DC,
and set the gain switch to the position to be used. Then
adj ust the front-panel zero
potentiometer for 0 V at the
output.
TOTAL GAIN
0.6
~
~LP
0.4 f:=--
0.2
o
0.1
GAIN x jEout I x ~
E ,n L P [E;;;I HP
1.0 10.0
figure 111-3. LP FILTER NORMALIZED AMPLITUDE
TRANSFER CURVE
0.8
0.6
I
~
E in IHP
0.4
0.2
o
.01 0.1 1.0
Figure 111-4. HP FILTER NORMALIZED
AMPLITUDE TRANSFER CURVE
100
10.0
111-4
140 dB
130 dB
120 dB
IIOdB
IOOdS
90dB
80 dB
..i.." _f
f
L
F3dB fHF3dB
(READ LEFT DEGREE SCALE) (READ RIGHT DEGREE SCALE)
TOTAL PHASE = 4LGEBRA'C StM CF HF 6 LF PHASE ANGLES
Figure 111-5. LP/HP FILTER NORMALIZED
PHASE TRANSFER CURVE
......
'"
"
c-
-
-
"\t-,.
"\
r\.
~
.-
r--
.. -
-
~
r\.
I--
-
[1]
"
'-;-
.
'0 2
10
10' 2
10
FREQUENCY
IN H l
Figure 111-6. TYPICAL COMMON MODE
REJECTION CHARACTERISTICS
3.10 MAXIMUM INPUT SIGNAL CONSISTENT
WITH LINEAR OPERATION
When speaking of the maximum input that can be applied,
a
distinction must be made between common mode signal,
that signal which is common to and identical at both the A
and B inputs, and differential signal,
that signal which exists
between
the inputs, that is, that is measured at one input
with respect to the other. A perfect amplifier responds not
at all to common mode signal, that is, if both the A and B
inputs are driven by the same large signal, no trace of that
signal should appear at the output. The signal at the output
should result from the differential input signal only. Real
)