REED ST-1301 User manual

reedinstruments
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Pantone 485 & 123
485 = (0/100/100/10)
123 = (0/18/100/0)
Model ST-1301
Light Meter
Instruction
Manual
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reedinstruments
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2
Pantone 485 & 123
485 = (0/100/100/10)
123 = (0/18/100/0)
Table Of Contents
Features...................................................................................................... 2
Specications............................................................................................. 3
Panel Description ....................................................................................... 4
Operating Instructions............................................................................. 5-6
Battery Replacement.................................................................................. 6
Features
• Easy to use, pocket size and light weight
• 3 1/2 digital LCD display with LUX, Fc, LOBAT, MAX, HOLD indication
• Accurately displays light level in terms of Foot Candles (Fc)
or Lux over wide range
• Measures from 0 to 50000 Lux/ Fc in four ranges
with resolution 0.1Lux/Fc
• Max Hold and Data Hold
• Auto Power Off
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Pantone 485 & 123
485 = (0/100/100/10)
123 = (0/18/100/0)
Specifications
Display: 1999 counts LCD display with LUX, Fc,
LOBAT, MAX, HOLD indication
Polarity: Automatic, (-) negative polarity indication
Over-range: “1” mark indication
Low battery indication: The “BAT” is displayed when the battery voltage
drops below the operating level
Measurement rate: 1.5 times per second, nominal
Storage temperature: -10°C to 60°C (14°F to 140°F)
at <80% relative humidity
Auto Power Off: Meter automatically shuts down after
approx. 15 minutes of inactivity.
Power: One standard 12V, A23 battery.
Dimensions/Wt.: 188 (H) x 64.5 (W) x 24.5 (D) mm/160g
Photo Detector
Dimensions/Wt.: 115 X 60 X 27 mm/80g
Light
Measuring Range: 200, 2000, 20000, 50000 Lux/Fc (1Fc=10.76
Lux)
Accuracy: +5% rdg + 10dgts (< 10,000Lux/Fc)
Accuracy: +10% rdg + 10dgts (> 10,000Lux/Fc)
(20,000Lux range reading x
10, 50,000Lux range reading x100)
Overrate Display: Highest digit of “1” is displayed (calibrated to
standard incandescent lamp
at color temperature 2856 k)
Repeatability: +2%
Temperature Characteristic: +0.1%/°C
Photo detector: One silicon photo diode with lter
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Pantone 485 & 123
485 = (0/100/100/10)
123 = (0/18/100/0)
Panel Description
1- LCD display: 1999 counts LCD display with
LUX, Fc, LOBAT, MAX, HOLD indication
2- Power /Function/Range switch: Turn power ON or OFF
and select measurement function and ranges.
3- Photo Detector: Long life silicon photo diode inside
4- MAX. HOLD: If you press the MAX. button, the maximum reading
will be held. Pressing the button once again, will release the hold and
allow a further measurement.
5- DATA HOLD: The reading will be held when the Data Hold button
Switch is pressed. If the button Switch is pressed once again,
it will release the hold and allow a further measurement.
6- Function button: Selects measurement functions of Lux or Fc
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Pantone 485 & 123
485 = (0/100/100/10)
123 = (0/18/100/0)
Operating Instructions
Measuring Light
1. Turn the Power/Function/Range switch to select the range to desired
(x1 Lux/Fc , x10Lux/Fc, x100Lux/Fc) range.
2. Remove the photo detector to the light source in a horizontal position.
3. Read the illuminance nominal from the LCD display.
4. Over-range: If the instrument only displays one “1” in the M.S.D. the
input signal is too strong, and a higher range should be selected.
5. When the measurement is completed, replace the photo detector from
the light source.
6. Spectral sensitivity characteristic: To the detector, the applied photo
diode with  lters makes the spectral sensitivity characteristic almost
meet C.I.E. (International Commission on Illumination) photopia curve
V(
y
) as the following chart described.
100% (Relative Sensitivity) Spectral Sensitivity
80% V(
y
)
60%
40%
20%
0
400 500 600 700
Wavelength (nm)
100% (Relative Sensitivity)
Spectral Sensitivity
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Pantone 485 & 123
485 = (0/100/100/10)
123 = (0/18/100/0)
7. Recommended Illumination:
Locations Lux
*Ofce
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 Examination 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
Battery Replacement
If the sign “BAT” appears on the LCD display, it indicates that the battery
should be replaced. Open the battery case and replace the expired
battery with new battery. (1 x 12V battery, A23 or equivalent)
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Pantone 485 & 123
485 = (0/100/100/10)
123 = (0/18/100/0)
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