T
O
S
8040
Appendi
x 59
A
.2
I
mprovements in Waveform
O
btained
U
sing
a Zero-start
S
witch
I
n
t
he wi
t
hs
ta
nding v
o
l
ta
ge
t
es
t
e
r,
o
pening
a
nd
c
l
o
sing
t
he p
r
im
ar
y side
o
f
t
he high
v
o
l
ta
ge
tra
nsf
or
me
r
wi
t
h
a
co
n
tact
swi
tc
h
o
pens
a
nd
c
l
o
ses
t
he p
r
im
ar
y winding
,
dis
tort
ing
t
he
o
u
t
pu
t
w
a
vef
or
m
.
This
r
esul
t
s in
t
he
a
ppli
cat
i
o
n
o
f unne
c
ess
ar
ily high
v
o
l
ta
ge
to
t
he DUT
,
p
ot
en
t
i
a
lly d
a
m
a
ging
t
he DUT
or
r
esul
t
ing in
a
F
AIL
a
ssess
-
men
t
f
or
a
g
oo
d DUT
.
T
o
r
edu
c
e dis
tort
i
o
n
o
f
t
es
t
v
o
l
ta
ge w
a
vef
or
ms
,
t
he T
O
S
80
4
0
t
es
t
e
r
uses
a
ze
ro-
s
tart
swi
tc
h semi
co
ndu
ctor
to
o
pen
or
c
l
o
se
a
c
i
rc
ui
t
when
t
he supply v
o
l
ta
ge is ne
ar
0
V
.
Fig.
A
-3
I
mprovements
in
Waveform
Ob
tained
U
sing
the
Z
ero
-
start
S
w
itch
The
pe
r
i
o
d
when
a t
es
t
is
exe
c
u
t
ed
.
Tes
t
v
o
l
ta
ge
w
a
vef
or
m
o
b
ta
ined
using
a
me
c
h
a
ni
ca
l
r
el
a
y
Tes
t
v
o
l
ta
ge
w
a
vef
or
m
o
b
ta
ined
using
t
he
ze
ro-
s
tart
swi
tc
h
ST
A
RT
sign
a
l
ST
OP
sign
a
l