The 881a Lux Meter LCD Digital Display marks a step forwardin the field of precision measurements. Although this LUX meter is a complex and delicate instrument, it’s ruggedness will allow many years of use.
Ⅰ FEATURES
l Precise and easy readout.
l High accuracy in measuring.
l LSI-circuit use provides high reliability and durability.
l Permits a wide range of light measurements.
l LOW BATTERY indicator.
l Adjusting zero automatically and excellent operation.
l LCD display provides low power consumption and clearly read out evening high ambient light.
l Separate LIGHT SENSOR allows user take measurements at an optimum position.
Ⅱ GENERAL SPECIFICATIONS
Display: 3 1/2 digits LCD display, maximum reading value display 1999
Ranges: 1-100,000Lux. (3 Ranges)
20,000Lux range: reading×10
100,000Lux range: reading×100
Resolution: 1Lux
Accuracy: ≤10,000Lux: ±4%rdg±0.5f.s
≥10,000Lux: ±5+10digits (Calibrated to standard incandescent lamp at color temperature 2856K)
Repeatability: ±2%
Temperature Characteristic: ±0.1%/℃
Test rate: 0.2times/sec.
Photo detector: one silicon photo diode with filter.
Operation temperature-humidity: -10℃ to 40℃(32℉-104℉) 0～70%Rh
Storage temperature-humidity: -10℃ to 50℃(14℉-140℉) 0～80%Rh
Over-input: indication of “1” (2,000Lux/20,000Lux)
Indication of “OVER” (100,000Lux)
Dimension: 165×57×32mm
Weight:155 g
Power Supply one 9V battery, Consumption current approx.2mA
Accessories: Instruction-manual
Ⅲ PANEL DESCRIPTIONS:
1. photo detector
2. LCD display
3. range select button
4. turn off, turn on, value hold
5. Back Light Button Switch
Ⅳ OPERATION INSTRUCTIONS:
1. Connect the battery, and then press the button to “ON”
2. Press the range selection switch to desired range.
3. Remove the photo detector cap and face it to light source in a horizontal position.
4. Read the test value from the LCD display.
5. Over range: if the instrument only display one “1” in the M.S.D., the input signal is too strong, and a higher range should be selected.
6. Data-Hold mode: press the HOLD key to select Hold model. When HOLD mode is selected, the LUX meter stops all further measurements and the test value with hold on the LCD. Press the button “HOLD” to the “ON”, the hold value will be cancelled.
7. When the measurement is completed, replace the photo detector cap and turn the power selector OFF.
Ⅴ BATTERY CHECK-UP & REPLACEMENT:
1. It is necessary to replace another one 9V battery, when left corner of LCD display show“ ”.
2. After turning off the meter, press the battery cover and push in the direction of the arrow to open.
3. Disconnect the batter from the instrument and replace it with a standard 9-volt transistor battery and go for the cover.
Ⅵ SPECTRAL SENSITIVITY CHARACTERISTIC:
Ⅶ MAINTENANCE:
1. The white plastic disc on the top of the detector should be cleaned with a damp cloth when necessary.
2. Do not store the instrument where temperature or humidity is excessively high.
3. The reference level, as marker on the face plate, is the tiof thep photo detector globe.
4. The calibration interval for the photo detector will vary according to operational conditions, but generally the sensitivity decreases in direct proportion to the product of luminous intensity by the operational time. In order to maintain the basic accuracy of the instrument, periodic calibration is recommended.
Ⅷ RECOMMENDED ILLUNINATON：
|
OFFICE
|
Conference, reception room
|
200～750Lux
|
|
Clerical work
|
700～1,500Lux
|
|
Typing drafting
|
1,000～2,000Lux
|
|
FACTORY
|
Packing work, entrance passage
|
150～300Lux
|
|
Visual work at production line
|
300～750Lux
|
|
Inspection work
|
750～1,500Lux
|
|
Electronic parts assembly line
|
1,500～3,000Lux
|
|
HOTEL
|
Public room, cloakroom
|
100～200Lux
|
|
Reception, cashier
|
220～1,000Lux
|
|
STORE
|
Indoors stairs corridor
|
150～200Lux
|
|
Show window, packing table
|
750～1,500
|
|
Forefront of show window
|
1,500～3,000
|
|
HOSPITAL
|
Sickroom, warehouse
|
100～200Lux
|
|
Medical examination room
|
300～750Lux
|
|
Operation room, emergency treatment
|
750～1,500Lux
|
|
SCHOOL
|
Auditorium, indoor gymnasium
|
100～300Lux
|
|
Class room
|
200～750Lux
|
|
Laboratory, library, drafting room
|
500～1,500Lux
|
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