EXTECH
INSTRUMENTS
EX850-en-GB_v2.4 7/16
6
Resistance
Measurements
Note:
Remove
power
before
making
resistance
measurements
1.
Insert
the
black
test
lead
into
the
negative
COM
terminal
and
the
red
test
lead
into
the
Ω
positive
terminal.
2.
Set
the
function
switch
to
the
Ω
position.
3.
Touch
the
test
probe
tips
across
the
circuit
or
component
under
test.
4.
Read
the
resistance
on
the
LCD
display.
Capacitance
Measurements
WARNING:
To
avoid
electric
shock,
discharge
the
capacitor
under
test
before
measuring.
If
“
dISC
”
appears
in
the
display,
remove
and
discharge
the
capacitor.
1.
Set
the
function
switch
to
the
Ω
capacitance
position.
2.
Insert
the
black
test
lead
banana
plug
into
the
negative
COM
jack
and
the
red
test
lead
banana
plug
into
the
CAP
positive
jack.
3.
Press
MODE
to
zero
any
stray
capacitance.
4.
Touch
the
test
probe
tips
across
the
part
under
test.
5.
Read
the
capacitance
value
in
the
display.
6.
The
display
will
indicate
the
proper
decimal
point
and
value.
Note:
For
very
large
values
of
capacitance
measurement
time
can
be
several
minutes
before
the
final
reading
stabilizes.
Frequency
Measurements
1.
Set
the
function
switch
to
the
V
Hz
Position.
2.
Press
and
hold
the
MODE
button
to
select
the
Frequency
(Hz)
function.
“k
Hz”
will
appear
in
the
display.
3.
Insert
the
black
test
lead
banana
plug
into
the
negative
COM
jack
and
the
red
test
lead
banana
plug
into
the
Hz
positive
jack.
4.
Touch
the
test
probe
tips
across
the
part
under
test.
5.
Read
the
Frequency
value
on
the
display.
6.
The
display
will
indicate
the
proper
decimal
point
and
value.
7.
Press
and
hold
the
MODE
button
again
to
return
to
the
voltage
mode
Ù
CAP
Hz
