Tektronix 7a11 Instruction Manual page 52

R
45, Termination
c
Fig . 5-7 . Pro
b
e ter m i n ation a dju st me
n
t location, ste
p
5 .
(11) Alter n ately select +U Ρ an d
I
N
VE
R
T
P
ola r ity
and ad
j
ust ST
EP
ΑΤΤΕΝ BA
L for mini m u m trace sh ift .
(12) C
h
ec
k
ST
EP
ΑΤΤΕΝ BA
L k
n ob position . If t
h
e
in d ex is more t
h an a pp roximately ±15 ° from to p -center,
re peat step 2 before
p
roced ing .
(13) Switc h
t
h
e 7 A 1 1 PO
L
A
R
ITY to +
UP .
6 . C
h
ec
k
/A d
j
ust Gai n (GAI
N R
138) ; C h ec
k V
ari-
able Gai n
R
ange (
V
A
R
IAB
L
E
R
180) ; C hec
k
V
A
R
IAB
L
E
B
ala n ce
REQ U I
REME
N T : Gain observ e d at any
p
ositio n of t
h e
VO
L TS/DI V switc
h
s
h
ould be accurate to wit
h in 2% α of
G A IN a d
j
uste d at t
h
e 0 .1
p
osition of t
h
e
V
O
L TS/DI
V
s w itc h . T h e
V
A
R
IA
BLE
co n trol s h o u ld be ca
p able of in-
creasing t
h
e selecte d VO
L
TS/DI
V to at least 2 .5 ti m es
t
h
e in d icated value .
NO ΤΣ
T he 7Α 11 gain can be calibrated with any reliable
so u rce. 7000-Series Oscilloscopes are equipped with
calibrators wh ich are accu rate to within 1%. The
Amplitude Calibrator And Comparato r, Tektronix
Pa r t No. 067-0502-01, is accurate to within 0 .25% .
When calibrated in the . 1 position of the VOL TSIDI V
switch, other positions of the switch will be accurate
to within 3% if α 7000-Series Oscilloscope Calibrator
is used, and to within 2% if the Amplitude Calib rator
And Comparator is used.
α .
Th
e control settings given in Table 5-2 a pp ly .
b . If t
h
e A m plit
u de Calibrator And Comparator (item 5)
is to
b e use d , set it for α 0 .5 volt s q uare wave output . If t
h
e
7000-Series Oscillosco
p e Calibrator is to be
u
se d , set it for α
4
V -
1 k H z outpu t .
Perfor m a n ce Check/Cal ibratio n-7 Α 1 1
c . Connect t
h e 7 Α 11
P
robe to t
h
e O u tp ut connector of
t h e Am p litu d e Cali
b rator a n d Com p arator or t
h
e Oscillo-
sco
p e Calibrator Outp ut
j
ac
k
, using t
h
e 7 A 1 1 Store d
P
robe
In
p ut A d apter (item 11) and α 50 Ω Coaxial Ca
b
le (item
16) .
d.
Set t
h
e 7A 11
V
O
L TS/DI
V
to .1
V .
e . Select 1 ms/Div swee p rate an d
a
d
j
u st t
h
e Time Base
for α triggered dis
p
lay .
f . CHECK-Gain acc u racy as follow s : wit
h Amp
litu d e
Calibrator And Co m parato
r
- 5
d ivisions ; wit
h
7000-Series
Oscilloscope Cali
b
rator - 4
d
ivisions .
M
eas u re from trace
center to trace ce n ter .
'-,, . IN (front panel) to obtain t h e approp r i
h .
C
HE
C
K
-Gai n ratio accuracy un d er eac
h
setu p given
in Table 5-4 .
TA
BLE
5-4
Gain Ratio Accuracy C
h
ec
k
7 Α 11 Ι ' ι Wit h
Am
p
lit ud e Calibra- ί
Wit
h
7000 - Series
VOLTS/
Ι
!
_
_
tor And _Com p a_rator
ι scillosco p e Calibrator -
DI
V
~" _ δί g ηα l Ί - Qis p lay - ~ Signal
Ι Disp lay
( (Divisions) Ι (Divisions)
20
100 Volts ~ 5 ± 0 .1 40V
____ .__-
_
- 10
50 Volts~ 5 4_-0 .1
1
40V
Ι
4 ±0 .12
40
V Ι
8 _ ±0 .24
-_4
V
__ ~_?+0_ .06
1
ι ;
5
V
οΙ_ts
5 +0 .1 ~ 4
V 4 +0 .12
__ _ .
_5 ~ 2 Volts
_ 4 + 0 .08 +0 .24
.2 V olts 1 1
5 ± 0 .1 ~
4 V ;
2 ±0 . 06 __
.1
λ
j
5 Volt
Adjusted _4
V
ι
A
d
j
u sted
ι ι
Ι
for 5 Ι i
_for 4
50 mV _~ι {'-_.2
Volt 4 _±0 .08 _ _ .4_
V ~ 8 ±0 .24
20 m V ι 1
1 _ V olt -+ 5 ±0 .1--- 4_0 m
V !_ 2 ± 0 .06
10 m
V
;' 50
m V olts ) __5 +0 .1 40 m V Ί _ 4 +0 .12
- 5
m V
-
I 20 m V olts - ~ -4 t0 .08 40
mV
8 ±0-24 -
5 20
V
olts ι
4 ±0 .08
_
α
-
2 10 Volts ~ 5±01
i .
P
us
h in and release t
h
e 7 Α 11
V
A
R
IA
BLE k
nob,
p laci n g it i n its outwar d position .
j .
C H
E
C
K-V
A
R
IA
BLE range . Rotate t h e VARIA
BL
E
control an d c
h
ec
k
t
h
at t
h
e dis
p lay am p litu d e can
b
e varie d
as follo ws : wit h Amplitu d e Cali
b
rator An d Comparator -
from 5
d ivisions to 2 divisions or less ; wit
h
7000-Series
Oscillosco
p
e Calibrator - from 8
d ivisions to 3 .2
d
ivisions or
less .
2+0 .06 --