Triplett LT68 User manual

User Manual

LT68

Datalogging Light Meter

5 Commonwealth Ave5 Commonwealth Ave

Woburn, MA 01801Woburn, MA 01801

Phone 781-665-1400Phone 781-665-1400

TollToll Free 1-800-517-8431Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Introduction

Congratulations on your purchase of the Triplett LT68 Digital Light

Meter. The LT68 measures illuminance in Lux and Foot candles (Fc).

The LT68 is a Datalogger and includes a PC interface and WindowsTM

compatible software for downloading data. Up to 16,000 readings can

be stored on the meter for download to a pc and 99 readings can be

stored and viewed directly on the meter’s LCD display. This meter is

shipped fully tested and calibrated and, with proper use, will provide

years of reliable service.

Description

Meter Description

1. Sensor Cable Plug

2. Micro USB Port

3. LCD Display

4. Upper Function Button Set

5. Lower Function Button Set

6. Power Button

7. Light Sensor

Note: Battery compartment on rear of meter

Display Description

1. Clock Setting Modes

2. Clock Display

3. Relative Mode Icon

4. Auto Power OFF (APO) Icon

5. Low Battery Icon

6. Data Hold Icon

7. Peak Hold Modes

8. Range Indicators

9. Unit of Measure

10. Digital Display

11. Bargraph Display

12. Data Download to PC Icon

13. PC Serial Connection Established

14. Memory Address Number

15. USB PC Connection Icon

16. Memory Icon

Operation

Meter Power

1. Press the Power button to turn the meter ON or OFF

2. If the meter does not switch on when the power button is pressed

or if the low battery icon is displayed on the LCD, replace the

battery.

Auto Power Off (APO)

1. The meter is equipped with an automatic power off (APO) feature

that turns the meter off after 20 minutes of inactivity. The icon

appears while APO is enabled.

2. To disable the APO feature, simultaneously press and

release the RANGE/APO and REC/SETUP buttons. Press

and release again to re-activate the APO feature.

Unit of Measure

Press the UNITS button to change the unit of measure from Lux to Fc or

from Fc to Lux

Range Selection

Press the RANGE button to select the measurement range. There are

four (range) selections for each unit of measure. The range icons will

appear to identify the range selected.

Taking a Measurement

1. Remove the sensor’s protective cap to expose the white sensor dome

2. Place the sensor in a horizontal position under the source of light to be

measured

3. Read the light level on the LCD display (numerically or with the

bargraph).

4. The meter will display ‘OL’ when the measurement is outside of the

meter’s specified range or if the meter is set to the wrong range.

Change the range by pressing the RANGE button to find the best

range for the application.

5. Replace the protective sensor cap when the meter is not in use.

Data Hold

To freeze the LCD display, momentarily press the HOLD button. 'MANU

HOLD' will appear on the LCD. Momentarily press the HOLD button

again to return to normal operation.

Peak Hold

The Peak Hold function allows the meter to capture short duration

light flashes. The meter can capture peaks down to 10mS in

duration.

1 Press the PEAK button to activate the Peak Hold feature. “Manu”

and “Pmax’’ will appear on the display. Press the PEAK button

again and “Manu” and “Pmin” will appear. Use ‘Pmax’ to capture

positive peaks. Use ‘Pmin’ to capture negative peaks.

2 When the peak has been captured, the value and associated time

will remain in the display until a higher peak is recorded. The

bargraph display will remain active displaying the current light

level.

3 To exit the Peak Hold mode and return to the normal operating

mode, press the PEAK button a third time.

Maximum (MAX) and Minimum (MIN) Reading Memory

The MAX-MIN function allows the meter to store the highest (MAX) and

lowest (MIN) readings.

5. Press the MAX-MIN button to activate the feature. “Manu”

and “MAX” will appear on the display and the meter will only

display the highest reading encountered.

6. Press the MAX-MIN button again. “Manu” and “MIN’ will appear on

the display and the meter will only display the lowest reading

encountered.

7. When the MAX or MIN has been captured, the value and

associated time will remain in the display until a higher value is

recorded. The bargraph display will remain active displaying the

current light level.

8. To exit this mode and return to the normal operating mode, press

the MAX-MIN button a third time.

Relative Mode

The Relative Mode function allows the user to store a reference value

in the meter. All displayed readings will be relative to the stored

reading.

1. Take the measurement, and when the desired reference value is

displayed, press the REL button.

2. “Manu” will appear on the LCD display.

3. All subsequent readings will be offset by the by an amount equal to

the reference level. For example, if the reference level is 100 Lux, all

subsequent readings will equal the actual reading minus 100 Lux.

4. To exit the Relative Mode, press the REL button.

LCD Backlight

The meter is equipped with a backlight feature that lights up the LCD display.

c. Press the backlight button to activate the backlight.

d. Press the backlight button again to switch the backlight off. Note

that the backlight will turn off automatically after a short period of

time in order to save battery energy.

e. The backlight function uses extra battery energy. To conserve

energy, use the backlight feature sparingly.

Clock and Sample Rate Setup

In this mode, the ▲and ▼arrow buttons will allow adjustment of the

selected (flashing) digits.

The ◄and ►buttons will scroll to the next or previous selection.

1. Power the meter, then press and the REC/SETUP and UNITS

buttons simultaneously to enter the Setup mode. The hours display

will flash.

2. Adjust and step through each selection as needed.

3. Press and hold the REC/SETUP and UNITS buttons

simultaneously to exit the Setup mode. The order of selection with the

flashing (icon) is:

Hour (0 to 23)

12:13:14

(Time)

Minute (0 to 59)

12:13:14

(Time)

Second (1 to 59)

12:13:14

(Time)

Sample Rate (00 to 99

seconds)

(Sampling)

Month (1 to 12)

10310

(Day)

Day (1 to 31)

10310

(Day)

Day of the week (1 to 7

10310

(Day)

(Sunday =

Year (00 to 99)

2013

(Year)

99 Point Memory

Up to 99 readings can be stored manually for later viewing directly on the

meter’s LCD. This data can also be transferred to a PC using the supplied

software program.

1. With the meter ON, press the REC button momentarily to store a

reading

2. The MEM display icon will appear with the memory address number

(01 -99)

3. If the 99-reading memory is full, the MEM icon and memory location

number will not appear

4. To view stored readings, press and hold the LOAD button until the

MEM display icon appears alongside the memory address number.

5. Use the up and down arrow buttons to scroll through the stored

readings.

6. To clear the data, press and hold the REC/SETUP and LOAD

buttons simultaneously until ‘CL’ appears in the memory location

field on the LCD

16,000 Point Datalogger

The LT68 can automatically record up to 16,000 readings in its internal

memory. To view the data, the readings must be transferred to a PC via

the supplied software.

1. Using the SETUP mode, set the time and sample rate. The default

sample rate is 1 sec.

2. To begin recording, Press and Hold the REC button until the MEM

display icon begins blinking. Data will store at the sample rate while

the MEM icon is blinking.

3. To stop recording. Press and Hold the REC button until the MEM

icon disappears.

4. If the memory is full, OL will appears as the memory number.

5. To clear the memory, with the meter off, press and hold the REC

button and then press the power button. “dEL” will appear in the

display. Release the REC button when “MEM” appears in the

display, the memory has been cleared.

USB PC Interface

Description

The LT68 meter can be connected to a PC via its USB interface. A USB

cable, along with

WindowsTM software, is included with the meter. The software allows the

user to:

Transfer previously stored readings from the meter’s internal

memory to a PC

View, plot, analyze, store, and print readings data

Remotely control the meter via virtual software buttons

Record readings as they are taken. Subsequently, printing, storing,

analyzing, etc. the readings data

Meter to PC Connection

The supplied USB cable is used to connect the meter to a PC. Connect

the smaller connector end of the cable to the meter’s interface port

(located under the tab at the left-hand side of the meter). The larger

connector end of the cable connects to a PC USB port.

Maintenance

Cleaning

The Meter and its sensor can be cleaned with a damp cloth. A mild

detergent may be used but avoid solvents, abrasives, and harsh

chemicals.

Battery Installation / Replacement

The battery compartment is located on the back of the meter. The

compartment is easily accessed by pressing and sliding the rear battery

compartment cover off of the meter in the direction of the arrow.

Replace or install the 9V battery and close the battery compartment by

sliding the compartment cover back onto the meter.

Never dispose of used batteries or rechargeable

batteries in household waste. As consumers, users

are legally required to take used batteries to

appropriate collection sites, the retail store where the

batteries were purchased, or wherever batteries are

sold.

Disposal: Do not dispose of this instrument in household waste. The user

is obligated to take end-of-life devices to a designated collection point for

the disposal of electrical and electronic equipment.

Other Battery Safety Reminders

1. Never dispose of batteries in a fire. Batteries may explode or leak.

1. Never mix battery types. Always install new batteries of the same type.

Storing

When the meter is to be stored for a period of time, please remove the

battery and affix the sensor’s protective cover. Avoid storing the meter in

areas of extreme temperature and humidity.

Specifications

Range Specifications

Units

Range

Resolution

Accuracy

Lux

400.0

0.1

± (5% rdg + 10

digits)

4000

40.00k

0.01k

± (10% rdg + 10

digits)

400.0k

0.1k

Foot

candles

40.00

0.01

± (5% rdg + 10

digits)

400.0

0.1

4000

± (10% rdg + 10

digits)

40.00k

0.01k

Notes:

1. Sensor Calibrated to standard incandescent lamp (color temperature:

2856K)

2. 1Fc =

10.76 Lux

General

Specifications

Display

4000 count LCD display with 40 segment

bargraph

Ranging

Four ranges, manual

selection

Over range

indication

LCD displays ‘OL’

Spectral

response

CIE photopic (CIE human eye response curve)

Spectral

accuracy

Vλfunction (f’1≤6%)

Cosine response

f’2≤2%; Cosine corrected for angular incidence

of light

Measurement Repeatability

±3%

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