
24-11Phase Measurement
Phasing lamps are sometimes used as a simpler alternative to synchroscopes. A lamp is connected
be
tween
th
e
tw
o
ge
nerators,
an
d
an
y
la
ck
of fr
equency
sy
nchronization
ma
nifests
as a i
ckering
of th
e
la
mp
. A ze
ro-phase
di
erence
be
tween
th
e
tw
o
ge
nerators
co
rresponds
to ma
ximum
br
ightness
in th
e
la
mp
.
24.3.7 Vector Voltmeters and Vector Impedance Methods
Alternating voltages (and currents) are oen characterized as vectors consisting of a magnitude and a
ph
ase,
wi
th
th
e
ph
ase
be
ing
me
asured
re
lative
to so
me
de
sired
re
ference
. Ma
ny
in
struments
ex
ist
th
at
ca
n
di
splay
th
e
vo
ltage
am
plitude
an
d
ph
ase
of a sig
nal
acr
oss
a