Amprobe THWD-5 Relative-Humidity-Temperature-Meter - Manual (Page 7)

6
CALIBRATIoN
Make sure the THWD-5 is turned off. plug the meter’s probe into a known trusted 32.8% 1.
salt bottle. press ”on/off + F/C” pushbuttons simultaneously for more than one second to
enter the calibration mode.
3x.x% will be flashing on lCD (see fig.1). After 30 minutes the ”3x.x%” will stop flashing.
2.
The calibration for the ”3x.x%” is now completed. proceed with the 7x.x% calibration.
fig. 1
Remove the meter from the 32.8% salt bottle and place it into a 75.3% salt bottle. 3.
press Min Max Reset pushbutton for more than one second to enter the7x.x% calibration
mode. ”7x.x%” will be flashing on lCD. After 30 minutes the ”7x.x%” will stop flashing.
The calibration process is now complete.
Note:
Auto power off is automatically disabled during calibration procedure. •
in order to get high accuracy, you must do the calibration at a 23 • ± 2°C (73 ± 2°f) and steady
airflow in the room.
if the value differs from 7x.x% or 3x.x% for more than 0.3%, the calibration fails .(see
•
trouble-shooting)
TRoUBLESHooTINg
power on but no display
Make sure the time of pressing the on/off pushbutton is more than 100 ms. •
Check the batteries are in place, good contact and correct polarity. •
Replace the batteries and try again. •
Flickering display and then disappears
Check whether the low battery indicator displayed before display disappeared. if yes, •
replace the batteries.
Turn on the meter by pressing ”
• on/off + Hold” key to disable auto power off.