Dickson THDx Manual - Halaman 7
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Halaman CetakCalibration
Your instrument was carefully tested and calibrated
before being shipped from the factory. For greatest ac-
curacy, we recommend factory re-calibration every 6-12
months. Call customer service at (630) 543-3747. If you
wish to do calibration yourself, follow these procedures.
Factory supplied calibration salt capsules or electronic
instruments recently calibrated at a certified lab are
recommended. Sling psychrometers and instruments
using mechanical sensing elements (human hair, wood
elements, bimetals, etc.) should not be used. NOTE: The
unit does not have to be recalibrated if you used a longer
probe cord.
Calibrate Humidity/Dew Point (using a
controlled chamber)
1. Turn the unit on and use dip switch #5 to select
humidity or dew point (RH=#5 off, Dew Point=#5
on). Use dip switch #3 to select °F or °C (°F=#3 off,
°C=#3 on).
2. To activate the calibration mode, turn the unit off.
Now press the "On/Off" key and the up arrow key
at the same time. The "UC" symbol will appear in the
display to indicate you are in "User Calibration"
mode.
3. Place the probe of the unit along with your precision
relative humidity/dew point instrument (RH/Dew
Point standards) into a controlled environment
chamber and allow 15 minutes for the unit to
stabilize. For best results, calibrate the unit at levels
typically monitored during normal operation.
4. Match the THDx reading with your precision RH/Dew
Point instrument. To raise the RH/Dew Point reading,
Pen Installation
1. Press the "Pen Home" key to return pen to the
home position.
2. Use the "Pen Arm" lifter to raise the pens.
Chart Installation
1. Press the "Pen Home" key to make pens move to the
outside of the chart.
2. Press the pen lifting bar to raise the pens. Remove the
recorded chart if present.
3. Place the new appropriate chart on the chart hub,
being certain that the edge of the chart slides under
the chart guide clips located at the outside of the
chart. NOTE: The chart should lay flat on the dial face.
4. Set time by inserting a coin into the groove in the
press the up arrow key. To lower the RH/Dew Point
press the down arrow key.
5. When calibrating is complete, simply press the
"On/Off" key to save calibration setting.
Calibrating in an open room, without the use of a salt
capsule or a chamber, is not recommended as humidity
can vary greatly within a very small area.
Calibrate Temperature
1. Press the "On/Off" key and the up arrow simultane-
ously to enter the "User Calibration" mode. Use dip
switch #3 to select °F or °C. (°F=#3 off, °C=#3 on).
The display should read "UC" in the upper right hand
corner of the display.
2. Place the THDx probe, along with your precision
temperature instrument (your temperature standard)
into a controlled environmental chamber allowing
both instruments to completely stabilize for approxi-
mately 1 hour.
3. Match the THDx reading with your precision
temperature instrument.
4. To raise temperature reading, press the "Alarm Set"
key. To lower the temperature reading press the
"Alarm On/Off" key. Each key press adjusts the
reading by 1°F.
5. When calibration is complete, simply press the
"On/Off" key to save calibrated changes.
Calibration is stored in memory even after you turn the
unit off. User calibration information will not be lost of
AC power fails.
3. Simply slide used pen cartridge off and slide new one
on. Lower pen arm lifter.
4. Press the "Pen Home" key to return pen to chart
position.
chart hub and turning clockwise until the correct hour
(and day if applicable) on the chart is referenced to
the timing clip.
5. Lower the pen lifting bar so that the pen tips rest
firmly on the paper.
6. Press the pen home key to return the pens to position.
At the end of tone recording time cycle, simply repeat
steps 1-5, replacing the used chart with a new one.
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