M & I Instruments DT-86 User manual

INSTRUCTION MANUAL
Light Meter
Information in this document is subject to change without notice.
©2012 M & I Instruments Inc. All Rights Reserved.
M & I Instruments Inc.
7035 Ma well Road, Unit 8
Mississauga ON Canada
L5S 1R5
Tel: [phone]
Fa : 1- 905-670-8243
Website: www.microinstruments.ca
Email: [e-mail]
TABLET OF CONTENTS
TITLE
1. FEATURES
2. SPECIFICATIONS
3. PANEL DESCRIPTION
4. OPERATING INSTRUCTION
5. BATTERY REPLACEMENT
1. FEATURES
 Easy to use, pock size and light weight
 3 1/2 digital LCD display with LUX, fc, LOBAT, MAX indication
 Accurately display light level in terms of Foot Candles (Fc) or Lu over wide
range.
 Measures from 0 to 40000 Lu / Fc in four ranges with resolution 0.1Lu /Fc .
 Auto ranging
 Ma Hold
 Light sensitive backlight LCD
 Auto power off
2. SPECIFICATIONS
Display 1999 counts LCD display with LUX, fc, LOBAT, MAX indication
Polarity Automatic, (-) negative polarity indication.
Over-range “OV” mark indication.
Low battery indication The “BAT” icon is displayed when the battery voltage drops below
the operating level.
Measurement rate 2.5 times per second, nominal.
Storage temperature -10 oC to 60 oC (14
o
F to 140
o
F) at < 80 % relative humidity
Operating temperature & Humidity 0℃ to 40℃(32℉to 104℉) & 0% to 80%
RH.
Auto Power Off Meter automatically shuts down after appro .17 minutes of
inactivity.
Power One standard 9V battery.

Dimensions/Wt. 157 (H) 54 (W) 34 (D) mm/170g
Light
Measuring Range 200, 2000, 20000, 40000 Lu /fc (1Fc=10.76 Lu )
Accuracy + 5% rdg + 10dgts (< 10,000Lu /fc)
Accuracy + 10% rdg + 10dgts (> 10,000Lu /fc)
(20,000lu range reading 10, 40,000lu range reading 100)
Overrate Display “OL” is displayed.
(Calibrated to standard incandescent lamp at color temperature 2856 k).
Repeatability + 2%.
Temperature Characteristic +0.1% / oC.
Photo detector One silicon photo diode with filter.
3. PANEL DESCRIPTION
1. Photo detector long life silicon photo diode inside
2. MAX and LUX/Fc function button Press button quickly, the ma reading will be
displayed. Pressing it once again will release the hold and allow another
measurement. Pressing this function button for 2 seconds will change the display
between LUX and Fc.
3. Power Turn power ON or OFF.
4. LCD Backlight Control: Meter will be will sensitive to environment light intensity,
if the environment is dark, it will turn on the LCD backlight on automatically,
otherwise it will turn off the LCD backlight.
5. Auto-ranging: 10 means the meter is in range 20k Lu , and the readings should
multiple with 10; 100 means the meter is in range 40k Lu , and the readings
should multiple with 100.
6. LCD display 1999 counts LCD display with LUX, fc, , MAX, indication
4. OPERATING INSTRUCTION
Measuring Light
1. Press the power button to start normal measurement.
2. Remove the photo detector to light source in a horizontal position.
3. Read the luminance on the LCD display. If the environment is dark, the LCD
backlight will automatically turn on.
4. The measure range will changed automatically with the light intensity. It includes
200.0 Lu ,2000 Lu ,20 KLu and 40 KLu 4 ranges for Lu ; or 20.0 FC,200
FC,2000 FC,4000 FC 4 ranges for FC correspondingly.
5. Press the function button for about 2 second to change the unit between Lu and Fc
6. Press the function button quickly to change to the MAX HOLD function. Press
once again to release the hold and allow another measurement.
7. Over-range: If the instrument display “OL” in the M.S.D. the input signal is too
strong
8. When the measurement is finished, replace the photo detector from the light
source.
9. Spectral characteristics of sensitivity: The photo diode with filters applied to the
spectral sensitivity does meet CIE (International Commission on Illumination)
photopia curve V (λ) as the following chart describes.

100% (Relative Sensitivity) Spectral Sensitivity
80%
V(λ)
60%
40%
20%
0
400 500 600 700
Wavelength (nm)
10. Recommended Illumination:
Locations Lu
*Office
Conference, Reception room. 200～750
Clerical work 700～1,500
Typing drafting 1000～2,000
*Factory
Packing work, Entrance passage 150～300
Visual work at production line 300～750
Inspection work 750～1,500
Electronic parts assembly line 1500～3,000
*Hotel
Public room, Cloakroom 100～200
Reception, Cashier 200～1,000
*Store
Indoors Stairs Corridor 150～200
Show window, Packing table 750～1,500
Forefront of show window 1500 ～3,000
*Hospital
Sickroom, Warehouse 100～200
Medical E amination room 300～750
Operating room
Emergency Treatment 750～1,500
*School
Auditorium, Indoor Gymnasium 100～300
Class room 200～750
Laboratory Library Drafting room 500～1,500
5. BATTERY REPLACEMENT
If the battery icon appears on the LCD display, it indicates that the battery
should be replaced. Open the battery case and replace the e pired battery with new
battery. (1 9V battery)