Extech Instruments 407026 Manuel utilisateur

USER GUIDE

Heavy Duty Meter

Model 407026

407026-EU-EN v2.6 3/14

Introduction

Congratulations on your purchase of the Extech Heavy Duty Light Meter. This light meter offers

selectable lighting types, data record/recall, relative display mode, and PC interface. This

professional meter, with proper care, will provide years of safe reliable service.

Specifications

General Specifications

Circuit Custom one-chip LSI microprocessor circuit

Display 3-1/2 digit (2000 count) LCD display with contrast adjustment

Measurement ranges LUX: 0 to 50,000 LUX (3 range); Fc: 0 to 5000 Fc (3 range);

Relative mode: 0 to 1999%

Data Hold Freezes displayed reading

Lighting Types Sodium, Daylight/Tungsten, Fluorescent and Mercury

Sensor Structure Cosine/color corrected photo-diode meets C.I.E.

Memory Store/Recall Records/Recalls Max/Min/Avg readings

Sample rate 0.4 seconds (approx.) per reading

Zero Adjust Push-button procedure

Auto Power Off After approx. 10 minutes

Data Output RS-232 PC serial interface (optional software/cable PN 407001)

Operating conditions 0 °C to 50 °C (32 °F to 122 °F); <80% RH

Power Supply 9V battery

Power consumption Approx. 5 mA DC. (approx. 200 hr battery life)

Weight 320 g (0.71 lbs.)

Dimensions Instrument: 180 x 72 x 32 mm (7.1 x 2.8 x1.3")

Sensor: 85 x 55 x 17.5 mm (3.3 x 2.2 x 0.7")

Range Specifications

Measurement Range Display Resolution Accuracy

LUX 2,000 LUX 0-1,999 LUX 1 LUX ± (4% + 2 digits)

of full scale

20,000 LUX 1,800-19,990 LUX 10 LUX

50,000 LUX 18,000-50,000 LUX 100 LUX

Foot Candles 200 Fc 0-186.0 Fc 0.1 Fc

2,000 Fc 167-1,860 Fc 1 Fc

5,000 Fc 1,670-5,000 Fc 10 Fc

Relative mode 0-1999% 1%

Note: The accuracy specification above applies to calibration performed using a precision standard

incandescent tungsten light source of 2856OK with meter on the tungsten setting.

407026-EU-EN v2.6 3/14

Meter Description

1 LCD Display

2 Keypad

3 Light sensor

4 Battery compartment (rear)

5 Sensor input

6 RS-232 PC Interface jack

7 Protective Holster

8 LCD Contrast Adjust

407026-EU-EN v2.6 3/14

Operation

Meter Power and Automatic Power Off

1. Press the POWER button to turn the meter on. If the display does not switch on, check the 9V

battery.

2. Press the POWER button again to turn the meter off.

3. The meter has an automatic power off feature that conserves battery energy. After 10 minutes

the meter automatically shuts off. To defeat this feature, press the RECORD button to put the

meter in the recording mode.

Display ZERO Calibration

Please perform a zero calibration before each use. This will ensure the highest accuracy.

1. Place the sensor cover over the light sensor, effectively blocking all light to the sensor.

2. Select the 2,000 LUX range using the RANGE switch.

3. Press the ZERO button. The reading should be zero.

4. Remove the sensor cover from the light sensor and proceed.

Selecting the unit of measure

Press the LUX/Fc button to select the desired unit of measure. The display icons will reflect the

current setting.

Selecting a light source

Select the type of lighting to be measured by pressing the LIGHT SOURCE button. The display will

indicate the lighting type icon (see icon list below).

L = Tungsten/Daylight (use this setting when calibrating with a Tungsten lamp)

F = Fluorescent

S = Sodium

C = Mercury

Note: For Halogen and Metal Halide light use the Tungsten setting

Taking Measurements

Hold the light sensor in the area where light is to be collected. The light being measured must

encompass the entire surface of the light sensor dome (pin point lighting such as with LED light

cannot be measured).

The display will indicate the light intensity value in LUX or Foot candles (Fc). Note that since the

main display area is limited to a reading of ‘1999’, the right-most digit in the 20,000 LUX and 5,000

Fc ranges appears on the lower LCD line. In the 50,000 LUX range, the last two digits appear on the

lower LCD line

It may be necessary to adjust the display contrast due to a change in viewing angle or voltage drift.

Use the LCD Contrast adjustment located on the right side of the meter to set the preferred contrast.

Display Range Selection

Take a measurement starting at the highest range and then work down using the RANGE switch. If

the display shows dashes along the top of the reading area ( ), the input exceeds the maximum

value for the selected range; select a higher range. If the display shows dashes along the bottom of

the reading area ( ), the input is too low; select a lower range.

407026-EU-EN v2.6 3/14

Data Hold

While measuring, press the HOLD button to freeze the reading. The LCD will display D.H. indicating

that the Data Hold function is engaged. Press HOLD again to return to normal operation.

Relative % Mode

In the RELATIVE mode of operation, the meter displays light level as a comparison to a reference

value. The reference value is stored by pressing the ‘%’ button while the desired light level

reference is on the display. When the button is pressed, ‘100%’ will be displayed and the ‘%’ icon

will appear.

After the ‘%’ button is pressed, light measurements will be displayed as a percentage of the

reference value. For example, if the light level reference is 1000 LUX, a display of 500 LUX will be

represented as 50%. Further, a light level of 250 LUX will display as 25%. Use the equation below:

Press the ‘%’ button again to return to normal operation.

Maximum (MAX), Minimum (MIN), and Average (AVG) readings

The meter can keep track of the highest, lowest, and average readings for later recall.

1. Press the RECORD button to start tracking the MAX, MIN, and AVG readings. The REC display

will switch on.

2. When desired, press the RECALL button.

3. The MAX display icon appears next to the REC display icon. The reading shown is the highest

reading encountered since the RECORD button was pressed.

4. Press RECALL twice more to view the MIN and AVG readings.

5. Press the RECORD button to return to normal operation.

RS-232 PC Interface

This meter is equipped with a RS-232 serial data port. For streaming of data to a PC via the RS232

Output jack, the optional 407001-USB kit (RS232 to USB cable and driver CD) along with the

407001 software (available free at www.extech.com) are required.

Battery Replacement

When the low battery indicator appears (LBT), replace the battery as soon as possible. Reliable

readings can be obtained for several hours after the first appearance of the low battery indication.

To replace the battery:

1. Remover the meter's rubber protective holster.

2. The battery compartment is located on the lower back of the meter. Pry the battery compartment

cover off using a small coin or screwdriver and remove the battery.

3. Replace the 9V battery and reinstall the cover.

4. Ensure that the battery cover is secured after replacing the battery.

You, as the end user, are legally bound (Battery ordinance) to return all used batteries and

accumulators; disposal in the household garbage is prohibited!

5. You can hand over your used batteries / accumulators at collection points in your community

or wherever batteries / accumulators are sold!

Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

Light measurement

Display % = --------------------------------------------------------------------------- X 100

Stored reference light measurement

407026-EU-EN v2.6 3/14

Typical Light Levels

Lux Foot

Candles

Lux Foot

Candles

Factories Home

20-75 2-7 Emergency Stairs,

Warehouse

100-150 10-15 Washing

75-150 7-15 Exit/Entrance Passages 150-200 15-20 Recreational Activities

150-300 15-30 Packing Work 200-300 20-30 Drawing Room, Table

300-750 30-75 Visual Work: Production Line 300-500 30-50 Makeup

750-1,500 75-150 Typesetting: Inspection Work 500-1,500 50-150 Reading, Study

1,500-

3,000

150-300 Electronic Assembly, Drafting 1,000-2,000 100-200 Sewing

Office Restaurant

75-100 7-10 Indoor Emergency Stairs 75-150 7-15 Corridor Stairs

100-200 10-20 Corridor Stairs 150-300 15-30 Entrance, Wash Room

200-750 20-75 Conference, Reception Room 300-750 30-75 Cooking\Dinning Room

750-1,500 75-150 Clerical Work 750-1,500 75-150 Show Window

1,500-

2,000

150-2000 Typing, Drafting

Store Hospital

75-150 7-15 Indoors 30-75 3-7 Emergency Stairs

150-200 15-20 Corridor/Stairs 75-100 7-10 Stairs

200-300 20-30 Reception 100-150 10-15 Sick Room,

Warehouse

300-500 30-50 Display Stand 150-200 15-20 Waiting Room

500-750 50-75 Elevator 200-750 20-75 Medical Exam Room

750-1,500 75-150 Show Window, Packing Table 750-1,500 75-150 Operating Room

1,500-

3,000

150-300 Storefront, Show Window 5,000-

10,000

500-1000 Eye Inspection

Common Conversion Factors

Illuminance (Visible Flux Density)

1 lm/m2=

1 lux (lx)

10-4 lm/cm2

10-4 phot (ph)

9.290 x 10-2 lm/ft2

9.290 x 10-2 foot-candles

Luminance (Visible Flux Density per Solid Angle)

1 lm/m2/sr =

1 candela/m2

Luminous Intensity (Visible Flux per Solid Angle)

1 lm/sr =

1 candella

Luminous Flux ( Visible Flux) 1 lumen (lm) =

1.464 x 10-3 watts @ 555 nm

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