Extech Instruments HD500 User's Guide download pdf (Page 4)

HD500-EU-EN v3.3 07/13

Operation

Basic Measurements

1. Press the

button to turn power on.

2. The upper display will indicate Air Temperature, Wet Bulb Temperature or Dew Point

Temperature and % Relative Humidity.

Press the WB/DP button to toggle between Air, WB or DP.

3. The lower display will indicate Type K temperature or IR Temperature.

Press and hold the IRT button to select the IR Thermometer.

The TYPE-K function will display “-------“ if a type k probe is not inserted into the meter.

4. Press the °C/°F button to change the temperature units from °C or °F.

Non-contact IR Surface Temperature Measurements

The built-in IR sensor can remotely measure the temperature of most surfaces. The

Laser pointer allows the user to aim accurately when taking non-contact

measurements.

1. Turn ON the meter using the

button.

2. The IR sensor and laser pointer are located at the top of the meter.

3. Point the sensor toward the surface to be measured.

4. Press and hold the IRT button to begin measuring the surface temperature of a

desired target. IR TEMP and will appear on the display. The laser pointer will

switch on to help aim the meter.

5. The measured IR surface temperature will appear on the lower display.

6. When the IRT button is released, the laser pointer will switch off and the reading

will freeze (data hold) on the display for approximately 7 seconds.

7. After the 7 second hold time the meter returns to the type k mode.

WARNING: Do not directly view or direct the laser pointer at an eye. Low power visible lasers

do not normally present a hazard, but may present some potential for hazard if viewed directly for

extended periods of time.

Data Hold

1. Press the HOLD buttons (one for upper display and one for lower display) to freeze the displayed

value for the respective display. Press again to unlock the display.

2. The HOLD icon will appear on the display when the Data Hold mode is active.

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Extech Instruments HD500 User's Guide Page 4