RH300 V1.4 11/04
4
RESET
MX/MN
RESET
MX/MN
RESET
MX/MN
RESET
MX/MN
/WB
T2
T/DP
T1
Wet Bulb and Dew Point measurements
1. To read the Wet Bulb measurement, press the button until the symbol Wb
appears in the lower right display. Note: T2 will not be displayed unless the external
probe is connected.
2. Wet Bulb temperature is now displayed.
3. To read the Dew Point measurement, press the button until the symbol DP
appears in the lower left display .
4. Dew Point temperature is now displayed.
Minimum (MIN) Maximum (MAX) Function
The MIN/MAX mode allows the user to view only the lowest (MIN) or highest (MAX)
readings. Press the button once and MIN appears on the display. The display is
now showing the lowest humidity and temperature reading in memory. Press the
button again and MAX appears on the display. The display is now showing the maximum
humidity and temperature readings in memory. To exit the MIN/MAX mode, press the
button again and the MIN and MAX icons disappear. To clear the current min/max
readings in memory, press and hold the button for more than two seconds.
Data Hold
Press the HOLD button momentarily to freeze the displayed reading. The 'HLD' icon will
appear on the upper right-hand side of the display. Press the HOLD button again to return
to normal operation.
Automatic Power OFF
The meter automatically shuts off after a programmed period of time. The default time is 10
minutes. To program the time period, press down the HOLD button while turning the meter
on. Continue to hold down both buttons and the meter will cycle through the selectable
power-off times: n, 2, 5, 10, 20, 40 or 60 minutes. “n” disables the auto power off function.
When the desired power-off time appears in the display, release both buttons to select the
time and return to normal operation.
Error Messages
An error message will appear on the display if the meter fails an internal diagnostic test.
1. ER1: Relative Humidity failure. Repair/replacement is necessary.
2. ER2: Internal temperature failure. Repair/replacement necessary.
3. ER3: Reference resistance failure. Repair/replacement necessary.
4. ER4: Internal temperature is out of range.
5. ER5: External temperature is out of range.
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