Extech Instruments SDL500 User Manual page 7

Wet Bulb Temperature Calculation Display
The SDL500 can display the results of a Wet Bulb calculation based on Relative Humidity and
Temperature.
Follow the instructions for the 'Relative Humidity /Temperature Probe Measurements' section above
but release the FUNCTION key when the '_Et' display icon appears. The display will now show the
Wet Bulb Temperature.
Data Hold
To freeze a measurement on the display, press the HOLD button momentarily. The meter will beep,
the reading will hold, and the HOLD icon will switch on. Press the HOLD button again to release the
display and exit the Data Hold mode returning the meter to the normal operating mode.
Display Backlight
To turn the display backlight ON or OFF, press and hold the backlight
seconds. The meter will beep when switching the backlight ON or OFF unless the beeper is
disabled.
MAX-MIN Readings
For a given measurement session, this meter can record the highest (MAX) and the lowest (MIN)
readings for later recall.
1. Press the MAX-MIN button momentarily to access this mode of operation (REC icon appears)
2. The meter is now recording the MAX and MIN readings.
3. Press the MAX-MIN button again to view the current MAX readings (MAX icon appears). The
readings on the display are now the highest readings encountered since the REC icon was
switched on (when the MAX-MIN button was first pressed).
4. Press the MAX-MIN button again to view the current MIN readings (MIN icon appears). The
readings on the display are now the lowest readings encountered since the REC icon was
switched on (when the MAX-MIN button was first pressed).
5. To exit the MAX-MIN mode, press and hold the MAX-MIN button for at least 1.5 seconds. The
meter will beep, the REC-MAX-MIN icons will switch off, the MAX-MIN memory will clear, and
the meter will return to the normal operating mode.
Reset Button
If the meter display or keypad locks, press the RESET button located on the meter's right side
under the snap-off compartment cover. After pressing the RESET button, power the meter OFF
then ON.
7
button for at least 1.5
SDL500-EU-EN V1.1 07/13