3
RH25
‐
EU
‐
EN
v1.0
5/13
Operation
Keypad
POWER:
Switch
the
meter
ON
or
OFF;
also
used
to
enter
the
MAX/MIN/AVG
memory
mode.
HOLD:
Press
to
enter
Data
Hold
(reading
freezes
on
display).
Press
again
to
exit
Data
Hold.
MODE:
Press
to
step
through
the
measurement
modes:
TEMP
(Temperature),
RH
(Relative
Humidity),
HI
(Heat
Index),
DP
(Dew
Point),
(WB
(Wet
Bulb),
and
HI/WB
(Wet
Bulb
Globe).
Powering
the
meter
Press
POWER
to
switch
meter
ON.
The
meter
shows
all
display
icons
momentarily
as
it
switches
ON
and
then
the
TEMP
icon
and
the
temperature
reading
will
display.
The
meter
will
also
emit
a
chirp
sound
as
it
switches
ON.
To
switch
the
meter
OFF,
press
and
hold
the
POWER
button
for
at
least
2
seconds.
MAX/MIN/AVG
Memory
With
the
meter
powered
ON,
press
POWER
button
momentarily.
The
MAX
icon
will
appear
and
the
meter
will
display
only
the
highest
reading.
Press
POWER
again;
the
MIN
icon
will
appear
and
the
meter
will
only
display
the
lowest
reading.
Press
POWER
again;
the
AVG
icon
will
appear
and
meter
will
only
display
the
average
reading.
Press
POWER
again
to
exit
(the
MAX/MIN/AVG
icons
will
switch
OFF).
Data
Hold
With
the
meter
powered
ON,
press
the
HOLD
button
momentarily.
The
HOLD
icon
will
appear
and
the
current
reading
will
freeze
on
the
display.
Press
HOLD
again
to
exit
(the
HOLD
icon
will
switch
OFF).
Automatic
Power
OFF
(Sleep)
Mode
The
meter
switches
OFF
automatically
after
15
minutes
of
inactivity.
To
defeat
this
feature
temporarily:
With
the
meter
switched
OFF,
press
the
HOLD
and
POWER
buttons
simultaneously
until
the
meter
displays
the
screen
shown
below.
Now,
the
user
must
switch
the
meter
OFF
manually
by
pressing
and
holding
the
POWER
button
for
at
least
2
seconds.
Note
that
the
next
time
the
meter’s
power
is
cycled,
the
Auto
Power
OFF
utility
will
again
be
active.
