Error Messages - Extech Instruments RH305 User Manual

Wet Bulb and Dew Point measurements
1. To read the Wet Bulb measurement, press 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
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
RESET
the button once and MIN appears on the display. The display is now showing the lowest
MX/MN
humidity and temperature reading in memory. Press the
the display. The display is now showing the maximum humidity and temperature readings in
memory. To exit the MIN/MAX mode, press the
disappear. To clear the current min/max readings in memory, press and hold the
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.
ER3: Reference resistance failure. Repair/replacement necessary.
3.
4. ER4: Internal temperature is out of range.
5. ER5: External temperature is out of range.
netzerotools.com
/WB
button until the symbol Wb appears in the
T2
T/DP
button until the symbol DP appears in the
T1
RESET
button again and MAX appears on
MX/MN
RESET
button again and the MIN and MAX icons
MX/MN
4
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RESET
button for
MX/MN
RH300-EU-EN v1.6 9/13