General
Description
The
Juni
o
r
Vol
t
O
h
myst
-
* WV
-
77C
i
s d
e
s
i
g
n
ed
to
me
asure d
e v
oltag
e
s from 0
.
1 volt to 1200
v
olt
s
, rm
s
s
ine
-
wave volta
ge
s from 0.1 v
o
l
t
t
o
1200 volts, and
re
s
i
s
t
a
n
ce
v
al
ues
fr
om
0
.
2
o
hm
t
o
1
00
0
megoh
ms.
T
h
e a
e
vo
lt
m
et
e
r
of
th
e
~
rV-
77
C
f
e
at
ure
s
a
n e
l
ect
ron
t
ub
e
as the hal
f·
wav
e
r
ect
i
fier.
It is a p
e
ak indi
ca
ting
t
ype
-
and i
s ca
librated
i
n te
rms
of the rm
s
vo
lta
ge
of
a
s
in
e w
a
ve
. Th
e V.r
V-
77C
h
as h
i
g
h
inp
ut imp
e
dan
ce
on
a
ll de and
a
e
v
oltage
ranges.
Onl
y t
wo
c
a
b
l
es
are us
e
d
w
ith
th
i
s instrum
e
nt
for all measurem
e
nts
,
pro
v
i
d
i
n
g
e
as
e
and flex
i
bili
ty
in op
e
ra
t
ion
.
Th
e fr
e
qu
e
n
cy
ra
n
ge o
f th
e WV
-
77C
,
d
e
p
e
n
d
i
ng
o
n
t
h
e
impedan
ce o
f th
e v
olta
g
e
s
o
u
r
ce
,
is flat to approx
i-
m
a
t
ely
3 mega
cy
cl
e
s.
W
hen
t
he
a
u
x
i
li
ary
\
V
G
-
3
01A
Cryst
al
Diode
Pr
o
b
e
i
s
used
,
th
e
dc
vo
lta
g
e
ran
g
e
s
are
ac
c
u
ra
t
e
to
w
i
t
hi
n
±1
0
%
fr
o
m
5
0
Kc
t
o 250
Kc
.
T
h
e
W
V
-
77C
i
s eq
uipp
e
d
w
it
h a s
i
ng
l
e
u
n
it prob
e,
t
h
e WG·29
9
B
D
C
/
A
C-Oh
ms
Pr
ob
e
an
d
C
ab
l
e
_
T
hi
s
prob
e
i
s pr
o
v
i
d
e
d
w
ith
a
buil
t
-i
n
swi
t
c
h
w
hich p
ermi
ts
qui
c
k
ad
a
ptat
io
n
to ei
th
e
r
dc
-
vo
lt
a
ge
me
a
s
ur
eme
n
ts
o
r
a
c
-vo
l
tag
e
a
n
d r
es
i
st
an
ce
measureme
n
ts
w
i
t
h
out
re
q
u
ir
-
in
g
a c
h
an
g
e
of pr
o
b
es
and cabl
es
_
Th
e
Jun
i
or
V
oltOhm
y
s
t
-
u
fi
liz
e
s
:8
p
,
u
s
h
-
p
ut{
ampli
.
r
.
"
IJ
~
~
e
d
e
bridge
c
i
rcuit
whi
c
h
_
a
r
or
d
r"
exce
ll
e
nt
l
ine
arii
j
-_
.f
r
e
spon
se
,
g
o
o
d
s
t
ab
ili
ty,
-
and
ver
y
hig
h
in
put
impeda
n
c
e.
(See
Sc
h
e
mati
c
Diagr
am,
Fig
.
5
.)
W
he
n no measuremen
t
is
bein
g
m
ad
e
, t
h
e cat
h
ode
c
ur
-
r
ents
t
hr
oug
h
the
t
ri
odes
of V
2
ar
e equaL
W
h
en
a
mea
s
urement
i
s b
ein
g
rna
d
e~
a
v
o
lt
a
g
e
i
s appli
e
d
be-
t
ween t
he
gr
i
d o
f
V2A
a
n
d
gr
ou
n
d
t
o
pr
o
v
i
de
a change
in
catho
d
e
c
urrent
of
t
hi
s t
ri
o
de
u
n
i
t
_
S
in
c
e
r
esi
s
tor
R
20
fun
c
tions
a
s
a
cat
hod
e
-
co
uplin
g
el
e
men
t
,
t
h
e
c
h
an
g
e
i
n
c
atho
de
c
urr
ent
th
r
o
ugh
this r
es
i
s
t
o
r
alt
e
rs
the
grid
-
t
o
-
cathod
e
p
o
t
e
nt
ial
o
f
V2B, a co
n
di
tion
w
h
ic
h
m
o
difie
s
the c
athode
c
u
rrent
o
f
V2B.
W
h
en
,
for
ex-
a
m
p
le,
th
e
c
urren
t
flow th
ro
u
gh
V
2
A
in
c
rea
ses,
t
he
flo
w o
f curren
t
th
rou
g
h
V
2
B
dec
re
a
.
ses.
Th
e
m
e
t
er
readin
g
i
s
proporti
o
n
al
t
o t
he
d
iff
e
r
e
n
c
e
b
e
tween
the
pla
te c
urr
ents
of th
e tri
o
d
es.
A
dd
i
tlO
n
al
f
e
at
ur
es
o
f th
e
\VV-77C
incl
u
de
p
r
ov
i
-
si
on
for z
e
r
o
-
c
ente
r
indi
c
ation,
us
ef
u
l
i
n
d
escr
imi
na
to
r
a
nd
bia
s
m
ea
sur
emen
ts
;
se
p
a
ra
t
e
'
sc
ale
s
for
lo
w
ac.
,
vo
lt
age
mea
surement
s
;
a
c
ir
c
u
it
des
i
g
,n
which
allo
w
s
me
asureme
nts
of
t
h
e
ac co
m
p
onen
t
~
-...f
a si
g
n
a
l
when
the de
co
mp
o
nen
t
i
s pre~ent
dnd
v
i
ce ,
~
er
sa; a
sep
ar
at
e
d
c
p
ro
b
e
w
ith
a
I-
megoh
m
r
es
istor
whi
c
h
m
inimiz
es
c
apa
c
i
tance
-
l
o
ad
ing
e
ffe
cts;
and
el
ec
tr
o
n
i
c
p
rotect
i
on
a
g
a
ins
t
me
t
e
r burn-
o
u
t
.
The
\VV-77C
Jun
io
r
Vo
l
tOhm
ys
t
is
a
lig
h
t
-
we
i
g
ht
comp
a
c
t
,
and
v
e
rsatile
ins
t
r
u
m
e
n
t.
-
A
reliabl
e
m
e
as
-
u
ri
n
g
dev
i
ce,
i
t w
ill
pr
ove
e
xtre
m
e
l
y
u
se
f
u
l
in tele
-
vis
ion
a
pp
li
ca
tion
s
as
we
ll
as
in
man
y
i
ndu
st
rial
a
pp
li
c
atio
ns
.
*
T
ra
d
e
!\tark
"V
o
ItOl
unys
l"
R
eg
.
U
.
S
. P
al
.
Off
.
--
.../
~
,L
F
unctions
of Controls and Terminals
Fu
nc
ti
on
se
l
e
c
to
r
~
Has
t
wo
fu
nc
ti
o
ns
;
t
u
rn
s
t
h
e
p
o
we
r
off
i
n "OF
F
"
p
os
iti
o
n
,
a
n
d
p
e
r
m
it
s
c
h
oice
of
t
y
pe o
f
meas
ur
e
m
e
nt
t
o be mad
e
.
R
a
ng
e
se
l
ec
t
o
r
-
Pe
rmits
choice
o
f
ra
nge
fo
r
the
desir
e
d
v
o
lt
ag
e
o
r r
es
i
s
t
a
n
ce
meas
ur
e
ment.
Z
E
R
O
AD
J
c
o
n
trol
-
Use
d
t
o
pos
iti
o
n
the
m
e
t
e
r
po
int
e
r
a
t
e
i
t
her
th
e
l
ef
t
-
h
a
n
d
"0"
posi
t
i
on
o
r t
o
the
z
e
ro
·c
enter
"
-
0
+
"
p
os
iti
o
n
,
w
h
en f
un
c
ti
o
n
se
l
ector
is
set to
"
+VO
LT
S
"
.
OHMS
A
D
J--
c
o
n
t
r
o
l
-
Us
ed
to
po
sit
i
o
n
t
h
e
m
e
t
er
po
i
n
t
er
a
t
the extreme
r
igh
t line
o
n t
he "
R" s
c
ale wh
e
n
th
e
fu
nc
t
io
n
se
l
ec
t
or
is in
"
OHMS"
p
os
iti
o
n.
VO
L
TS
OHMS
te
r
m
i
na
l-
Vo
lt
ages
a
nd
_
r
e
s
i
s
tances
to
be
meas
ur
e
d
are app
li
e
d
b
etween
t
his
te
rm
i
na
l
a
n
d
th
e
cli
p of the GRO
U
ND
cab
l
e
a
s d
es
cr
ib
e
d
under
"op
e
r
a
ti
o
n
"
b
e
l
ow
.
GRO
U
ND
cable--
i
s
d
i
r
ec
tl
y
c
onn
ec
t
ed
t
o the cha
ss
is
of th
e
i
ns
t
r
um
ent
.
I
t s
e
rves
a
s a c
om
m
on
g
rou
n
d
for
t
he
~
r
V
-
7
7C
and
t
h
e
chassis
of th
e
eq
ui
pme
nt
u
n
d
e
r
t
es
t o
r
a
sso
ci
a
t
e
d
tes
t
in
s
trum
e
n
ts
.
• 4 •
Summary of Contents for VoltOhmyst WV-77C
Page 13: ...I ...
