digital illuminance meter
DIGITAL ILLUMINANCE METER
ZI-7811
INSTRUCTION
APO
4
1
2
3
kLux
kFc
1
2
BAT
Auto Ranging Light Meter
with RS232
MAX
MIN
DISABLE
APO
REL
HOLD
HOLD
BACKLIGHT
RS232
Fc
Lux
Ⅰ INSTRUCTION

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 construction.

The light sensitive component used in the meter is a
very stable, long-life silicon photo diode and spectral
response filter.
2
Ⅱ FEATURES

Light-measuring
levels
ranging
form
0.1Lux~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.

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 20minutes.

Maximum and minimum measurements.

Relative reading .

Easy to read large backlit display

USB output connect with pc

Auto ranging
3
Ⅲ SPECIFICATIONS

Display :3-3/4 digit LCD with high speed 40 segment
bar graph.

Measuring Range: x,400.0 Lux,4000 Lux,40.00 KLux
and 400.0 KLux /40.00 FC,400.0 FC,4000 FC,40.00
KFC.
NOTE: 1FC=10.76Lux,1KLux=1000Lux,1KFC=1000FC

Over range Display: LCD will show “OL” symbol.

Spectral Response: CIE Photopic. (CIE human eye
response curve).

Spectral Accuracy: CIE Vλ function f1’≦6%

Cosine Response: f2’ ≦2%

Accuracy: ±5% rdg±10d.(<10,000Lux)
±10% rdg±10d.(>10,000Lux)

Repeatability: ±3%

Sampling Rate: 1.5 times/sec of analog bar-graph
indication;1.5times/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.
4

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.);

Photo detector Dimensions: 115L×60W×20H(mm);

Meter Dimensions: 170L×80W×40H;

Weight: 390g.

Accessories: Carry case, instruction manual, battery.
5
Ⅳ NAME OF PARTS AND POSITIONS
APO
1
4
2
1
2
3
kLux
kFc
1
2
BAT
Auto Ranging Light Meter
with RS232
3
7
4
MAX
MIN
DISABLE
APO
8
REL
5
HOLD
HOLD
9
10
BACKLIGHT
6
RS232
Fc
Lux
11
12
6
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.
1.
Auto-Ranging : It indicates
400.0 Lux,4000 Lux,40.00
KLux and 400.0 KLux /40.00 FC,400.0 FC,4000
FC,40.00 KFC total 4ranges for Lux and 4 ranges for
FC.
2.
Power Control key:
The power switch key turns the
illuminance meter ON or OFF.
3.
Disable Auto-power off key: enable Auto-power off.
4.
BACK-LIGHT key: Back light control key.
5.
USB
key:
control
to connect with pc with USB
(Note:If you press the USB key but you do not connect
with pc, the meter will wait you for connecting
with PC, if
you do not want to connect with
the PC, you should restart the meter.)
6.
MAX/MIN key: Maximum and minimum reading recorder
control key.
7.
REL key: Relative reading control key.
8.
Peak Hold key: Peak Hold recorder control key.
9.
Data-Hold key: Data Hold control key.
7
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..
Ⅴ OPERATING 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
in a horizontal position.
4.
Read the illuminance nominal from the LCD display.
5.
Over range: If the instrument only displays “OL”, the
input signal is too strong, and a higher range should be
Auto 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.
8
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 the PEAK key again 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 again to exit
this mode.
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. USB mode: connect with pc with USB
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.
9
Ⅵ BATTERY 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.
Ⅶ SPECTRAL SENSITIVITY CHARACTERISTIC

To the detector, the applied photo diode with filters
makes
almost
the
spectral
meet
COMMISSION
ON
sensitivity
characteristic
C.I.E.(INTERNATIONAL
ILLUMINATION)
Photo
curve V (λ) as the following chart described.
10
Ⅷ 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
tip of the 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.
11
Ⅸ RECOMMENDED ILLUMINATION
1FC=10.76Lux
LOCATIONS
OFFICE
Lux
FC
200~750
18~70
Clerical work
700~1,500
65~140
Typing drafting
1,000~2,000
93~186
Visual work at
300~750
28~70
Inspection work
750~1,500
70~140
Electronic parts
1,500~3,000
140~279
150~300
14~28
100~200
9~18
Reception
200~500
18~47
Cashier
750~1,000
70~93
Indoors Stairs
150~200
14~18
Conference,
Reception room
FACTORY
production line
assembly line
Packing work,
Entrance passage
HOTEL
Public room,
Cloakroom
STORE
Corridor
12
Show window,
750~1,500
70~140
1,500~3,000
140~279
100~200
9~18
300~750
28~70
750~1,500
70~140
100~300
9~28
Class room
200~750
18~70
Laboratory, Library,
500~1,500
47~140
Packing table
Forefront of show
window
HOSPITAL
Sickroom,
Warehouse
Medical Examination
Room
Operating room,
emergency
treatment
SCHOOL
Auditorium, Indoor
Gymnasium
Drafting, room
13
Connecting to pc
System requirements:
Windows 98 or windows 2000 (or higher)
Minimum hardware requirements
Pc or notebook, 90MHz Pentium of faster, 32Mb Ram,
At least 5Mb free hard disk space screen resolution
800×600.
Connection
1, Switch the light meter on
2, Plug the other end of the connecting cable to serial
interface of the PC (USB).
3, Plug the USB line connecting cable 13.6mm jack plug
into the meter socket
4, Press the USBkey.
5, Start the light meter software.
6, Selecting the COM port 4.
(Note: you should better switch the light meter on
before you plug the USB line connecting cable 13.6mm
jack plug into the meter)
14
Installing the software
 Stare windows
 Close any applications possibly open before
installing the “CEM.LINK” software.
 Insert the CD into the CD-drive.
 Enter x:\setup in the command line and press OK.
The files setup.exe and the help file will be copied
onto the hard disk (selected path: c:\program
files\1309). x is the drive-letter of your
CD-drive ,e.g. ”g”.
 Now follow the installation program
instructions.
 Once the software is installed, switch on the
meter.
 Start the software.
 Selected the COM port 4.
 Insured you press the USB key and selected
the COM port before you start the software.
 If the connection is in order, the following
display will be seen on the screen.
15


If the connection is not in order, the message “NO
CONNECTION” appears on the screen.
(CARE: If you want to not connect with the
PC, you should better press USB key first, or
there will be a operational error, and then you
should close the program 1309,at last you’d
pull out the USB line.)
16
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17
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