SETUP INSTRUCTIONS
INSTALL BATTERY
To open the battery compartment:
1. Turn the meter over and loosen the single screw securing the battery compartment cover.
Remove the screw and set it aside.
2. Lift the tab at the bottom of the cover in order to remove it and set it aside.
3. Plug the included “9V” battery into the wired socket inside the compartment. The terminals
of the battery and the socket mate in only one way, with the smaller male terminal plugging
into the larger female terminal.
4. Replace the battery compartment cover and reinstall the screw to secure it.
OPERATING INSTRUCTIONS
POWERING ON & OFF
To power on the meter
, press the
ON/OFF HOLD
button. By default, the instrument will
immediately begin making and displaying RH (relative humidity) measurements.
Before using the meter to make measurements, remove the dust cap protecting the
humidity/temperature sensor.
To power off the meter
, press and hold the
ON/OFF HOLD
button for at least 2 seconds. The
shutdown will be announced by two short beeps.
After powering off the meter, replace the sensor protection cap if you do not expect to use the
instrument within the next few hours.
By default, the meter will automatically power itself off if no front-panel button is pressed within
any 30-minute period. The upcoming shutdown will be announced by three beeps of the beeper.
When this Auto Power Off function is active, the term
APO
will appear at the bottom left of the
LCD (see Fig. 2).
To disable the APO functio
n, you must power on the meter in a special way, by pressing and
holding the
ZERO
button while pressing the
ON/OFF HOLD
button. When the
APO
function has
been disabled, the term
APO
will not appear on the LCD.
SELECTING A PARAMETER
The RH650 can measure and display the value of eight different
moisture-related parameters. When the meter is in measurement
mode, you select a parameter by pressing either the
UP>
and
<DN
buttons to move the pointer on the top line of the LCD directly
above it. For example, the following is the display for RH
measurement mode—the operating mode that the meter enters by
default when it is powered on.
7
°F
