Extech Instruments RH401 User Manual page 5

Selecting temperature units of measure (C/F)
Press and hold the
Automatic Power OFF
The meter automatically shuts off after a programmed period of time.
To disable auto power off, with the meter off, press
the keys and the meter is now in Non-Sleep Mode.
The power off time is adjustable from 5 to 600 seconds. To change the auto power off setting, press
the key to enter the setting procedure. Use the
down key to set the value. When the desired power-off time appears in the display, press
the key again to save the parameters.
Backlight
Press the BKLT button to turn the display backlight on. The backlight will remain on until the BKLT
button is pressed again or the meter is turned off.
Error Messages
An error message will appear on the display if the meter fails an internal diagnostic test.
1. E1 (Top display): IR temperature failure. Repair/replacement is necessary.
2. E2 (Top display): IR temperature >932°F (500°C).
3. E3 (Top display): IR temperature <-40°F (-40°C).
4. E9 (Top display): Calibration error.
5. E1 (Middle display): Temperature failure. Repair/replacement is necessary.
6. E2 (Middle display): Dew Point is out of range or Repair/replacement is necessary.
7. E3 (Middle display): Air temperature is out of range or Repair/replacement is necessary.
8. E1 (Bottom display): RH circuit error. Repair/replacement is necessary.
9. E5 (Bottom display): RH circuit error. Repair/replacement is necessary.
Setup memory
The selected display, emissivity value, auto power off time, backlight status and the laser pointer
status are stored in memory and will remain in memory as the user default setting until
reprogrammed by the user.
nd Quality Products Online at:
o o
C/ F button momentarily to toggle the temperature units.
GlobalTestSupply
www.
and . When "n" appears, release
up key and the
5
.com
RH401-en-GB_ V1.7 1/17
sales@GlobalTestSupply.co