4
Protections
Over Temperature Protection
I
f t
he
i
nternal
t
emperature
of
the
p
ower
s
upply
e
xceeds
8
5
℃
,
the
i
nstrument
w
ill
pr
otec
t i
tsel
f
by
a
utomatically
t
urning
powe
r O
FF.
If
this
ha
ppens
the
buzzer
w
ill g
o
o
ff
and
the
d
isplay
will
indicate
the
f
ollowing
(OVE
R HE
AT):
Figure 16 - Over Temperature Protection Warning
Over Voltage Protection (OVP)
The
9
129B
has
o
ver
voltage
protectio
n func
tion,
w
hich
may
b
e
t
riggere
d
due
t
o
a
n
intern
al
error,
w
rong
o
peration
by
t
he
c
ustomer,
or
over
voltage
a
t th
e
outpu
t t
erminals
.
Once
t
he
power
s
upply
e
nters
the
protected
O
VP
s
tate,
t
he
user
w
ill
hear
a
b
uzzer
s
ound
a
n
d
the
o
utput
will
be
turned
o
ff.
OVP
wi
ll
b
e
t
riggere
d if v
oltage
at
th
e
o
utpu
t i
s
0.1
V
hi
gher
than
the
maximu
m v
oltage
s
et.
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