Extech Instruments SDL400-NIST User Manual page 4

Measurements
Light Meter Measurements
1. Connect the light sensor to the top of the meter as previously described.
2. Power on the meter by holding the power button for at least 1.5 seconds.
3. Select the Light Measurement mode by pressing and holding the FUNCTION button for at least
1.5 seconds (if necessary). The 'LIgHt' icon indicates the Light Meter mode.
4. Select the desired unit of measure LUX or Foot candles by pressing and holding the UNIT
button for at least 1.5 seconds (if necessary).
5. Place the sensor on a surface, or hold in hand, with the domed area facing the light source
under test. The light sensor is dome shaped to accommodate light reaching it from various
angles.
6. Read the measurement on the meter's LCD.
7. This instrument measures light intensity (illuminance) in LUX or Foot candle measurement units.
ZERO Adjustment (Light Measurement readings only)
To zero the light meter display, simply press and hold both arrow keys (▼ ▲) for at least 1.5
seconds. This is typically done with the protective sensor cover installed to ensure that a complete
absence of light displays a zero reading. This zero function can also be used as a relative, or offset,
function if the value is within 20 Lux of
cap on after such use.
Temperature Measurements
1. Connect the temperature sensor to the top of the meter as previously described.
2. Power on the meter by holding the power button for at least 1.5 seconds.
3. Select the Temperature Measurement mode by pressing and holding the FUNCTION button for
at least 1.5 seconds (if necessary). The 'tP' icon indicates the temperature mode of operation.
4. Select the desired Thermocouple Type (K or J) in the Setup Mode.
5. Select the desired unit of measure (C or F) in the Setup Mode.
6. Hold the thermocouple in the air in the area under test.
7. Read the temperature measurement on the meter's LCD.
Important Safety Note on Thermocouple Ratings
The temperature range of this meter extends up to 1300°C (2372°F); however the range of
thermocouple probes vary greatly; be sure to select a probe rated for the expected temperature
measurement ranges.
Data Hold
To freeze a displayed reading on the LCD, momentarily press the HOLD button (the HOLD display
icon will appear above the held reading). To release the held reading press the HOLD button again.
zero, but remember to re-zero the meter with the protective
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