Triplett LT80 User manual

User Manual

LT80

LED Light Meter

Introduction

Congratulations on your purchase of the Triplett LT80 LED Light Meter that

measures light intensity from white LED light sources. The LT80 can also

measure light from fluorescent, metal halide, high‐pressure sodium, and

incandescent sources, for reference only (unspecified accuracy). The LT80

can measure light up to 40,000 Fc (400,000 Lux).

Safety

Do not operate the meter in environments where the following are

present: explosive gases (or materials), combustible gases (or

materials), steam, or dust.

Please replace the battery immediately when the low battery symbol

appears on the LCD.

Do not touch the meter’s circuit board for any reason; static

electricity or contamination could damage the sensitive

components.

This instrument was designed for pollution

degree 2. Operation Altitude: Up to 2000m

(7000’).

Description

1. Photo Detector Cover

2.Photo Detector (Sensor)

3.LCD Display

4.Lux/Fc Button

5.Calibration and ZERO Button

6.Data Hold Button

7.MAX/AVG/MIN Button

8.Power Button: ON/OFF

Operation

Power ON/OFF

Long press the Power button to power the meter. To power the meter

OFF, short press the Power button.

Taking Measurements

1. Switch the meter ON and remove the sensor’s protective cover to

expose the light sensor dome. The display should switch ON; if not,

check that batteries are installed and fresh.

2. The meter measures the intensity of the light (illuminance) that strikes

the sensor dome in foot‐candles and Lux units (1 fc = 10.76 lux),

displaying this measured value on its LCD.

3. Position the meter and light source so that the light strikes the

sensor dome straight on (perpendicular) with as little an angle as

possible.

4. The meter’s display can show a value up to 9999. However, for

readings that represent measurements higher than this, the meter

uses x10 or x100 feature. For example, to represent a measurement

of 11,000 fc the meter will display 1100 with the x10 indicator.

Auto Power OFF

To save battery life, the meter powers down automatically after

approximately 12 minutes of inactivity.

Enable/Disable Auto Power Off

While the meter is ON, long press the Power button to disable the Auto

Power OFF utility (the Clock symbol will switch OFF). To enable the

Auto Power OFF utility, repeat this process.

LUX/FC Button

Press the LUX/FC button to toggle between Lux and FC (foot‐candles)

measurement units.

MAX/AVG/MIN Button

The meter can record the maximum, minimum, and average readings as

described below:

Short press the “MAX/MIN” button and the meter will begin to track the

maximum/average/minimum measurements; the “MAX” icon will display at the

top of the LCD window indicating that the meter is now showing the maximum

reading. The reading will not change until a higher reading is registered.

Press the “MAX/MIN” button again to switch from “MAX” to “AVG”, where the

meter will show the average measurement value. The “AVG” icon will be

displayed above the displayed value.

Press the “MAX/MIN” button again to change the mode from “AVG” to “MIN”,

where the meter will show the minimum value measured. The “MIN” icon will be

displayed.

Press the “MAX/MIN” button again to switch from “MIN” back to “MAX”.

To exit this mode, hold the “MAX/MIN” button for at least 2 seconds. The

MAX/AVG/MIN icons should all be switched OFF when the unit returns to the

normal operating mode.

HOLD Button

Press the HOLD button to freeze the current reading on the LCD. Press the

HOLD button again to release the reading. In the Data Hold mode, HOLD is

displayed on the LCD.

Zero Calibration Procedure

Ensure that the protective cap is attached to the light sensor.

Power the meter and the LCD should display ‘0’.

1. Short press the “CAL ZERO” button to perform the zero adjustment

(CAL will appear on the display).

2. The CAL display will switch off when the calibration has been completed.

3. If the protective cap is not covering the sensor when the Zero

calibration is started the LCD display will read CAP. In this case, please

cover the sensor with the cap and restart this procedure.

Measurement Tips

For maximum accuracy allow the light being measured to fall directly on the

sensor as perpendicular as possible with a minimal angle of incidence.

When the meter is not in use, please keep the protective cap in place over

the light sensor. This will prolong the life of the sensor.

When the meter is to be stored for long periods, please remove the batteries

and store them separately. Batteries can leak and cause damage to the

meter’s components.

Avoid areas of high temperature and humidity when using this instrument.

Battery replacement

Turn off the instrument.

Remove the battery cover

Replace the battery.

Install the battery cover

WARNING

If the symbol “ ” appears on the LCD,

please replace the battery immediately

Specifications

Display

9999 count, maximum display 9999

Sensor

Silicon photodiode and filter

Measuring Range

999.9,9999, 99990,400,000 Lux

99.99,999.9,9999,40,000 Footcandles

Resolution

0.1,1, 10,100 Lux

0.01,0.1,1,10 Footcandles

Accuracy

±3% ±3Lux(0~500Lux), ±3%(up 501 Lux)

(Calibrated to standard incandescent lamp 2856°K)

8% other visible light source

Angle deviation from

cosine characteristics

30°

±2%

60 °

±6%

80 °

±25%

Power Supply

2 batteries 1.5V AAA MN2400 LR03 AM4

Battery life

About 200 hours

Dimensions

133(L)x48(W)x23mm(L) Hmm

5.3(L)x 1.9(W) x0.2(L) inch

Weight

250g (include battery)

Accessories

User’s manual, carrying case, 1.5V battery*2

Relative Spectral Sensitivity

The deviation from the comparative standards for luminosity is determined by

JIS standard C 1609-1993.

Peak sensitivity wavelength: 550 nm .

Typical Light Levels (1 Fc = 10.76 Lux)

Lux

Foot

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

380

440

500

560

620

680

740

λ)

＊

721

100

RELATIVE SENSITIVITY (%)

Typ. Ta=23℃

WAVELENGTH (nm)

200‐750

20‐75

Conference,

300‐750

30‐75

Cooking Room,

Reception 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,

750‐1,500

75‐150

Operating Room

Packing Table

1,500‐3,000

150‐300

Storefront, Show Window

5,000‐10,000

500‐1000

Eye Inspection

Warranty Information

Triplett / Jewell Instruments extends the following warranty to the original purchaser of

these goods for use. Triplett warrants to the original purchaser for use that the products sold

by it will be free from defects in workmanship and material for a period of (1) one year from

the date of purchase. This warranty does not apply to any of our products which have been

repaired or altered by unauthorized persons in any way or purchased from unauthorized

distributors so as, in our sole judgment, to injure their stability or reliability, or which have

been subject to misuse, abuse, misapplication, negligence, accident or which have had the

serial numbers altered, defaced, or removed. Accessories, including batteries are not

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