Extech Instruments LT300 User manual

LT300 V2.0 6/06

910

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for one year from date of shipment (a six month limited warranty

applies to sensors and cables). If it should become necessary to return the instrument for

service during or beyond the warranty period, contact the Customer Service Department at

(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact

information. A Return Authorization (RA) number must be issued before any product is

returned to Extech. The sender is responsible for shipping charges, freight, insurance and

proper packaging to prevent damage in transit. This warranty does not apply to defects

resulting from action of the user such as misuse, improper wiring, operation outside of

specification, improper maintenance or repair, or unauthorized modification. Extech

specifically disclaims any implied warranties or merchantability or fitness for a specific

purpose and will not be liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the product. The warranty set

forth above is inclusive and no other warranty, whether written or oral, is expressed or

implied.

Introduction

Congratulations on your purchase of the Extech LT300 Digital Light Meter. The LT300

measures light level (illuminance) to 200,000 Lux (20,000 Fc). The LT300 offers a backlit

display, MAX/MIN, Data Hold, Relative, Peak, and Reset features. This instrument is

shipped fully tested and calibrated and, with proper use, will provide years of reliable

service.

Meter Description

1. Sensor cable

2. Analog bargraph

3. Numerical display

4. RANGE button

5. ON/OFF button

6. MAX/MIN button

7. RESET button

8. LCD Backlight button

9. LUX button

10. Fc foot candle button

11. Protective rubber jacket

12. RELATIVE button

13. Data HOLD button

14. PEAK button

15. Photo sensor dome

Notes: Protective sensor cap not shown. Battery compartment, Tilt Stand, and Tripod Mount arelocated on the rear

of the instrument. The protective rubber jacket must be removed frommeter to access battery compartment.

LT300 V2.0 6/06

Operation

Light sensor

1. The light sensor is permanently

attached to the meter by the coiled

cable.

2. Remove the protective cap by

unsnapping it to expose the white

domed light sensor. When the sensor’s protective cap is removed, the white domed

light sensor lens will begin to capture light. Replace the cap when the meter is not in

use.

Turn Power ON or OFF

Press the button to turn power on or off. If the display does not switch on, check that

the 9V battery is installed and is fresh.

Selecting Lux or Foot candle units of measure

Press the LUX button to select lux units or the Fc button to select foot candle units.

Measurement Procedure

1. Remove the protective cap from the sensor so that the white domed light sensor is

exposed to the light. For overhead lighting, the sensor can be placed on a desk or

table top. A tripod mount and a tilt stand are located on the rear of the meter for

convenience.

2. The display will indicate the light level in Fc or Lux.

3. Press the RANGE button to select the range that provides the maximum resolution. If

the ‘OL’ appears the light measurement is out of range. Select another range using the

RANGE button.

4. Press the backlight button to illuminate the LCD display if needed.

MAX/MIN

The Max/Min function allows for recording and display of the maximum and minimum light

levels over time.

1. Press the MAX/MIN button. The MAX display icon will appear and meter will now

display and hold only the highest reading. The display will update only when a higher

reading is measured.

2. Press MAX/MIN button. The MIN display icon will appear and meter will now display

and hold only the lowest reading. The display will update only when a lower reading is

measured

3. Press MAX/MIN again. The MAX MIN display icons will appear flashing and meter will

now display the current reading, but will continue to record the highest and lowest

values.

4. Press MAX/MIN again to cycle through MAX and MIN displays.

5. To exit the MAX MIN mode, press and hold the MAX/MIN button until the MAX and

MIN icons completely disappear.

Data Hold

Press the HOLD button to freeze the displayed reading. The ” MANU HOLD” hold icon will

appear on the display. Press the HOLD button again to return to normal operation. When

the Data Hold function is enabled the analog bar graph will continue to display level

changes.

LT300 V2.0 6/06

Peak Hold

The Peak Hold feature allows the meter to captures light pulses that rise or fall down to

10µs.

1. Press and hold the PEAK button until CAL appears in the display.

2. Momentarily press the PEAK button. The ‘PMAX’ icon will appear on the LCD. The

meter will then measure and display any light pulses. The display will hold the results

until a higher pulse appears.

3. Press the PEAK button again to display the “PMIN” values.

4. To exit the Peak Hold mode, press and hold the PEAK button until the ‘PMAX’ or ‘PMIN’

icon disappears.

Relative mode

Measurements can be displayed as a difference between the measured light level and a

stored reference value. To store a reading as a reference, press the REL button when the

desired reference measurement is on the LCD (the REL icon will switch on). All

subsequent displayed readings will be “relative” to the stored reference value. For

example, if the reference value is 100 and the actual light level is 125, the meter will

display 25. To view the reference value, press the REL button again so that the REL icon

begins to flash. The displayed value will be the reference value. To exit the Relative mode,

press and hold the REL button until the REL icon disappears.

RESET

Press the RESET button to clear the memory and exit from REL, HOLD, PEAK and

MAX/MIN. The RESET will also reset the auto power off timer.

Backlight

Press the “ “ button to turn the backlight on. Press again to turn it off.

Maintenance

Cleaning and storage

1. The white plastic sensor dome should be cleaned with a damp cloth when necessary.

Use only a mild soap if needed. Do not use solvents, abrasives, or harsh detergents to

clean the dome.

2. Store the meter in an area with moderate temperature and humidity (refer to the

operating and storage range in the ‘Specifications’ section).

Battery Replacement

When the battery power begins to fail the low battery symbol “ ”will appear on the LCD.

Replace the 9V battery by first removing protective jacket that encases the meter. Remove

the rear (center) battery compartment screw to access the battery compartment. Ensure

that the compartment cover is securely fastened and that the protective jacket is properly

installed before using the meter.

LT300 V2.0 6/06



Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Specifications

Ranges and Resolution Accuracy

Lux

40.00, 400.0, 4000, 40.00k, 200.0kLux ± (5% Rdg + 0.5% Full Scale)

Foot candle (Fc)

40.00, 400.0, 4000, 20.00kFc ± (5% Rdg + 0.5% Full Scale)

General Specifications

Display Multi-function 3-3/4 (3999) digit LCD with Bargraph indicator

Over range indication LCD displays ‘OL’

Spectral response CIE photopic (CIE human eye response curve)

Spectral accuracy CIE Vfunction (f1 ï 6%)

Measurement Repeatability±2%

Temperature coefficient ±0.1% per oC

Sampling rate 13.3 times per second (bargraph); 1.3 times per second (digital

display)

Photo detector Silicon photo-diode with spectral response filter

Peak Hold Capture light peaks to 10µS

Operating conditions Temperature: 32 to 104oF (0 to 40oC); Humidity: < 80% RH

Storage conditions Temperature: 14 to 140oF (-10 to 50oC); Humidity: < 80% RH

Dimensions 6.5 x 3.0 x 1.7" (165 x 76 x 43mm)

Weight Approx. 14.2 oz. (403g) with battery installed

Low battery indication “ ” appears on the LCD

Power supply 9V battery

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Service Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

Appendix

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

OceRestaurant

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 Room,

Dining Table

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 5,000-10,000500-1000 Eye Inspection

Spectral Sensitivity

400 450 500 550 600 650 700

Wavelength (nm)

- - - - - Light Meter Response _____ CIE Response

0.8

0.6

0.4

0.2

more info for Extech LT300

Phone: 01235 838 555

Email: cs@airconcern.co.uk

Web: www.airconcern.co.uk

Air Concern Ltd, Building 173 Curie Avenue Harwell Didcot, Oxfordshire

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