Pyle PLMT68 User manual

DIGITAL ILLUMINANCE METER
INSTRUCTION MANUAL
PLMT68
www.pyleaudio.com

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ⅠINSTRUCTION
The digital illuminance meter is a precision instrument
used to measure illuminance (lux, footcandle) in the
field.
It is meet CIE photopic spectral response.
It is fully cosine corrected for the angular incidence of
light.
The illuminance meter is compact, tough and easy to
handle owing to its constrution.
The light sensitive component used in the meter is a
very stable, long-life silicon photo diode and spectral
response filter.
ⅡFEATURES
Light-measuring levels ranging form
0.01lux~0.1klux/0.01fc~0.01kfc,repeatedly.
High accuracy and rapid response.
Data-hold function for holding measuring values.
Unit and sign display for easy reading.
Automatic zeroing.

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Meter corrected for spectral relative efficiency.
Correction factor need not be manually calculated for
non-standard light sources.
Short rise and fall times.
Peak-hold function for tracing the peak signal of light
pulse with least duration 10μs and keep it.
Capable of selecting measuring mode in lux or fc scale
alternatively.
Auto power off 30 minutes.
Maximum and minimum measurements.
Relative reading & Reset function.
Easy to read large backlit display
ⅢSPECIFICATIONS
Display :3-3/4 digit LCD with high speed 42 segment
bargraph.
Measuring Range:40.00 lux,400.0 lux,4000 lux,40.00
Klux and 300.0 Klux /40.00 fc,400.0 fc,4000 fc,30.00
Kfc.
NOTE: 1fc=10.76lux,1Klux=1000lux,1Kfc=1000fc
Overrange Display: LCD will show “OL” symbol.

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Spectral Response: CIE Photopic. (CIE human eye
response curve).
Spectral Accuracy: CIE Vλfunction f1’≦6%
Cosine Response: f2’ ≦2%
Accuracy: ±5% rdg±0.5% f.s.
Repeatability: ±3%
Sampling Rate: 13.3 times/sec of analog bar-graph
indication;1.3times/sec of digital display.
Photo Detector: One silicon photo diode and spectral
response filter.
Operating temperature & Humidity :
0℃to 40℃(32℉to 104℉) & 0% to 80% RH.
Storage Temperature & Humidity :
-10℃to 50℃(14℉to 140℉) & 0% to 70% RH.
Power Source: 1 piece 9V battery.
Photo detector Lead Length: 150cm (approx.);

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Photo detector Dimensions: 115L×60W×20H(mm);
Meter Dimensions: 170L×80W×40H;
Weight: 390g.
Accessories: Carry case, instruction manual, battery.
ⅣNAME OF PARTS AND POSITIONS

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1. LCD Display: 3-3/4 digit displays with a maximum
reading of 3999,and the indicating signs of measured
values, unit function symbols and decimal points etc are
display.
2. Range Selector key: It indicates 40.00 lux, 400.0
lux,4000 lux,40.00 Klux and 300.0 Klux /40.00 fc,400.0
fc,4000 fc,30.00 Kfc total 5 ranges for lux and 4 ranges
for fc.
3. Power Control key: The power switch key turns the
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illuminance meter ON or OFF.
4. MAX/MIN key: Maximum and minimum reading recorder
control key.
5. RESET key: Push function reset control key.
6. BACK-LIGHT key: Back light control key.
7. REL key: Relative reading control key.
8. Data-Hold key: Data Hold control key.
9. Peak Hold key: Peak Hold recorder control key.
10. Lux key: Pressing the lux key selects taking
measurement of illuminance in lux scale
11. FC key: Pressing the fc key selects taking measurement
of illuminance in footcandle scale;
and,1footcandle=10.76lux.
12. Photo detector.
ⅤOPERATING INSTRUCTIONS
1. Power-up: Press the power key to turn the meter ON or
OFF.
2. Selecting the lux or fc scale: Set the range selection
switch to desired lux or fc range.
3. Remove the photo detector cap and face it light source

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in a horizontal position.
4. read the illuminance nominal from the LCD display.
5. Overrange: If the instrument only displays “OL”, the
input signal is too strong, and a higher range should be
selected.
6. Data-Hold mode: Press the hold key to select Data-Hold
mode. When HOLD mode is selected, the illuminance
meter stops all further measurements. Press the HOLD
key again to exit Data-Hold mode. Then it resumes
normal operation.
7. Peak-Hold recorder mode: Press and hold down PEAK
key until display shown the “CAL” letter, then press
PEAK key cycle through Pmax and Pmin recorder mode,
and expose the photo detector to light pulse measuring
field. Press and hold down PEAK key 2 seconds to exit
PEAK recorder mode, then the meter will resume
normal operation.
8. Maximum and Minimum recorder mode: Press
MAX/MIN key to cycle through Maximum(MAX) reading,
Minimum(MIN) reading and current reading(MAX/MIN
blink) recorder mode. Press MAX/MIN key two seconds
to exit this mode.

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9. Relative reading mode: Press REL key to enter Relative
mode. The display shown zero value and the current
reading will be stored as a zero-in value. Press again to
exit this mode.
10. Reset mode: Every time when this key is pressed the
pushed function(HOLD,MAX/MIN,REL,PEAK except
BACK-LIGHT) ,auto-power-off function and counter will
be reset.
11. Back-light function: Press the Backlight key to turn on.
Press again to turn off.
12. When the measurement is completed, replace the photo
detector cap and turn the meter off.
ⅥBATTERY CHECK-UP & REPLACEMENT
1. As the battery power is not sufficient, LCD will display
low battery, and replacement of one new battery is
required.
2. After turning off the meter, disconnect the battery cover
with a screwier.
3. Disconnect the battery from the instrument and replace
it with a standard 9V battery and go for the cover.

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ⅦSPECTRAL SENSITIVITY CHARACTERISTIC
To the detector, the applied photo diode with filters
makes the spectral sensitivity characteristic
almost meet C.I.E.(INTERNATIONAL
COMMISSION ON ILLUMINATION) Photopic
curve V (λ) as the following chart described.
ⅧMAINTENANCE
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
tip of the photo detector globe.

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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.
ⅨRECOMMENDED ILLUMINATION
1fc=10.76Lux
LOCATIONS Lux fc
Conference,Recepti
on room
200~750 18~70
Clerical work 700~1,500 65~140
OFFICE
Typing drafting 1,000~2,000 93~186
Visual work at
production line
300~750 28~70
Inspection work 750~1,500 70~140
Electronic parts
assembly line
1,500~3,000 140~279
FACTORY
Packing work,
Entrance passage
150~300 14~28

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Public room,
Cloakroom
100~200 9~18
Reception 200~500 18~47
HOTEL
Cashier 750~1,000 70~93
Indoors Stairs
Corridor
150~200 14~18
Show window,
Packing table
750~1,500 70~140
STORE
Forefront of show
window
1,500~3,000 140~279
Sickroom,
Warehouse
100~200 9~18
Medical Examination
Room
300~750 28~70
HOSPITAL
Operating room,
emergency
treatment
750~1,500 70~140
Auditorium,Indoor
Gymnasium
100~300 9~28
Class room 200~750 18~70
SCHOOL
Laboratory, Library,
Drafting, room
500~1,500 47~140