EXTECH
INSTRUMENTS
EX850-en-GB_v2.4 7/16
9
Data
Hold
To
freeze
the
LCD
reading,
press
the
HOLD
button.
While
data
hold
is
active,
the
HOLD
icon
appears
on
the
LCD.
Press
the
HOLD
button
again
to
return
to
normal
operation.
Peak
Hold
The
Peak
Hold
function
captures
the
peak
AC
or
DC
voltage
or
current.
The
meter
can
capture
negative
or
positive
peaks
as
fast
as
1
millisecond
in
duration.
1.
Turn
the
function
switch
to
the
A
or
V
position.
2.
Use
the
MODE
button
to
select
AC
or
DC
3.
Allow
time
for
the
display
to
stabilize.
4.
Press
and
Hold
the
PEAK
button
until
“
CAL
”
appears
in
the
display.
This
procedure
will
zero
the
range
selected.
5.
Press
the
PEAK
button,
Pmax
will
display.
6.
The
display
will
update
each
time
a
higher
positive
peak
occurs.
7.
Press
the
PEAK
button
again,
Pmin
will
display.
The
display
will
now
update
and
indicate
the
lowest
negative
peak.
8.
To
return
to
normal
operation,
press
and
hold
the
PEAK
button
until
the
Pmin
or
Pmax
indicator
switches
off.
Note
:
If
the
Function
switch
position
is
changed
after
a
calibration
the
Peak
Hold
calibration
must
be
repeated
for
the
new
function
selected.
MAX/MIN
1.
Press
the
MAX/MIN
key
to
activate
the
MAX/MIN
recording
mode.
The
display
icon
"
MAX
"
will
appear.
The
meter
will
display
and
hold
the
maximum
reading
and
will
update
only
when
a
new
“max”
occurs.
2.
Press
the
MAX/MIN
key
and
the
display
icon
"
MIN
"
will
appear.
The
meter
will
display
and
hold
the
minimum
reading
and
will
update
only
when
a
new
“min”
occurs
3.
Press
the
MAX/MIN
key
and
a
blinking
“
MAX
MIN
”
will
appear.
The
meter
will
display
the
present
reading,
but
will
continue
to
update
and
store
the
max
and
min
readings.
4.
To
exit
MAX/MIN
mode
press
and
hold
the
MAX/MIN
key
for
2
seconds.
Temperature
Units
(
˚
F
/
˚
C)
The
temperature
unit
selection
switch
is
located
in
the
battery
compartment.
To
change
the
units,
remove
the
battery
door,
lift
out
the
battery
and
set
the
switch
for
the
desired
units.
LCD
Backlight
Button
The
LCD
is
equipped
with
backlighting
for
easier
viewing,
especially
in
dimly
lit
areas.
Press
the
backlight
button
to
turn
the
backlight
on.
Press
again
to
turn
the
backlight
off.
Units Switch
F
C
