REED K7020 User manual

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Model K7020
Illuminometer
Instruction
Manual

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2
Table of Contents
Features......................................................................................... 2
Specications.............................................................................3-4
General Specications ................................................................ 3
Electrical Specications............................................................... 3
Spectrum for Light Sensor .......................................................... 4
Instrument Description .................................................................. 4
Measuring Procedures .................................................................. 4
Measuring Consideration .............................................................. 5
Battery Replacement..................................................................... 5
Correction Factor for Different Types of Lighting .......................... 5
Features
• Sensor used the exclusive photo diode & color correction lter,
spectrum meet C. I. E. Photopic
• Both Lux & Foot-candle measurement, wide range
• Analog output, can connect the external recorder
• High accuracy in measuring
• Separate LIGHT SENSOR allows user to measure the light at an
optimum position
• Fast & Slow response time selector
• LSI circuit provides high reliability and durability
• LCD display allows clear read-out even at high ambient light level
• Pocket size, easy to carry out & operation
• Compact, light weight and excellent operation
• Built-in low battery indicator
For service on this or any other REED product or information on other
REED products, contact REED Instruments at [e-mail].

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Specifications
General Specifications
Display 13 mm (0.5”) LCD (Liquid Crystal Display)
Measurement Lux, Ft-candle (Fc)
Ranges Lux-0 to 50,000 Lux, 3 ranges
Foot-candle: 0 -5,000 Fc, 3 ranges
Sensor Used the exclusive photo diode & color correction
lter, spectrum designed to meet C. I. E.
Zero Adjustment Automatic adjustment
Sampling Time Approx. 0.4 sec.
Response Time Fast & Slow selector
Over input indication Indication of “1”
Analog Output 0.1 mV/1 digits, max. output: 200 mV
Operating Temperature 0 to 50°C (32°F to 122°F)
Operating Humidity Less than 80% RH
Power Supply 006P DC 9V battery
Power Current Approx. DC 2 mA
Weight 220 g/0.52 lbs.
Dimensions Meter: 163 x 70 x 30 mm (6.4 x 2.8 x1.2”)
Sensor probe: 85 x 55 x 12 mm (3.2 x 2.2 x 0.5”)
Accessories Sensor probe included
Optional carrying case also available (Model CA-03)
Electrical Specifications
Lux
Range In-range Display Resolution Accuracy
2,000 Lux 0-1,999 Lux 1 Lux ± 5 % + 2 digits
20,000 Lux 2,000-19,990 Lux 10 Lux ± 5 % + 2 digits
50,000 Lux 20,000-50,000 Lux 100 Lux ± 5 % + 2 digits
Foot-candle (Fc)
Range In-range Display Resolution Accuracy
200 Fc 0-199.9 Fc 0.1 Fc ± 5 % + 2 digits
2,000 Fc 200-1,999 Fc 1 Fc ± 5 % + 2 digits
5,000 Fc 2,000-5,000 Fc 10 Fc ±5 % + 2 digits

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Spectrum
for Light Sensor
Instrument Description
1 - Display
2 - Data Hold Switch
3 - Power Off/Range Switch
4 - LUX/Fc Switch & Response Time Switch
5 - Analog Output Terminal
6 - Battery Compartment/Cover
7 - Light Sensor
Measuring Procedures
1. Determine Lux or Ft-candle on slide switch (#4, above), Determine the
response time on slide switch (#4, above), typical select to the “SLOW”
position.
2. Select the max. range on the “Range Switch” (#3, above).
3. Hold the “Light Sensor” (#6, above) by hand & face the measuring light
oppositely, then the Display (#1, above) will show light values directly.
4. During the measurement, if slide the “Data Hold Switch” (#2, above) to
the “HOLD” position, then will freeze the display reading permanently.
Slide the “Hold Switch” to the left side releasing the data hold function again.

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Measuring Consideration
1. As the range of 20,000 Lux (2000 Fc) is designed to measure the light
values 000 Lux (200 Fc). So if the measured light values less than 2000
Lux (200 Fc), please select the “Range Switch” to the lower range to let
display reading show high resolution & be kept within high accuracy.
2. As the range of 50,000 Lux(5000 Fc) is designed to measure the light val-
ues 0,000 Lux (2,000 Fc). So if the measured light values less than 20,000
Lux (2,000 Fc) please select the “Range Switch” to the lower range to let
display reading show high resolution & be kept within high accuracy.
Battery Replacement
1. When the left corner of the LCD display shows LO BAT “ ”, it
indicates the battery output less than 6.5 V - 7.5 V. Replacement of the
battery is then needed. However measurements could still be taken for
another few hours before the meter becomes inaccurate.
2. Open the Battery Cover (#6 in gure on page 4) at the back of meter
and remove the battery.
3. Replace with a 9V battery and reinstall the cover.
Correction Factor for Different Types of Lighting
The light meter is calibrated under a precision “Standard light tungsten
incandescent source of 2856°K”. If the user intends to make
measurements precisely under a different light source from
“MERCURY LAMP” or “FLUORESCENT LAMP” or
“SODIUM LAMP” or “DAYLIGHT”
the measurement value can be corrected (multiplied) using the follow-
ing factors that compare the measuring reading values tested under the
“Standard light tungsten source of 2856°K”.
MERCURY LAMP x 1.05
FLUORESCENT LAMP x 0.97
SODIUM LAMP x 1.11
DAYLIGHT x 0.95

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