Sper scientific 840020 User manual

Light Meter with Bar Graph
840020
Instruction Manual
SPER
SCIENTIFIC LTD.

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TABLE OF CONTENTS
INTRODUCTION ................................................................................... 2
PANEL DESCRIPTION......................................................................... 3
MEASUREMENT PROCEDURES ........................................................ 3-4
ZERO ADJUSTMENT ........................................................................... 4
BATTERY REPLACEMENT ................................................................. 4
AUTOMATIC SHUT OFF ...................................................................... 4
CALIBRATION...................................................................................... 4
RS232 SERIAL INTERFACE................................................................ 5
SPECIFICATIONS ................................................................................ 6
LIGHT SPECTRUM CHART ................................................................. 7
OPTIONAL ACCESSORIES................................................................. 7
WARRANTY.......................................................................................... 8
INTRODUCTION
Features 5 ranges, high resolution, measures Foot Candles or Lux, fast
and accurate response, automatic shut off and a hold function. The
sensor is cosine and color corrected and hermetically sealed to ensure
long term stability. Comes ready to use with probe, battery, carrying case,
and instructions.

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PANEL DESCRIPTION
1
2
3
4
65
Factory calibration only
8
11 13
12
10
9
1. DISPLAY 6. RANGE Button 10. STAND
2. POWER Button 7. ZERO Button 11. BATTERY
3. HOLD Button 8. RS232 Output 12. PHOTO SENSOR
4. REC. MAX/MIN Button 9. SENSOR INPUT Socket 13. SENSOR Plug
5. LUX/FC Button
7
MEASUREMENT PROCEDURES
•Insert the SENSOR Plug into the SENSOR INPUT Socket and turn the
meter on pressing the POWER Button.
•Remove the lens cap from the PHOTO SENSOR.
•Select the desired unit of measure by pressing the LUX/FC Button.
•Select the maximum range by pressing the RANGE Button. If the out
of range indicator "- - - - " appears, select another range or discontinue
use. For the highest accuracy, select the range that offers the highest
resolution (most number of digits appearing after the decimal point).
•Point the PHOTO SENSOR toward the source and read the results on
the display.
•Push the HOLD Button to freeze the reading in the display. The word
"HOLD" appears on the LCD. Press the HOLD Button again to exit this
function.

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•To obtain peak readings, press the HOLD Button for 2 to 3 seconds.
The words “Peak HOLD” will appear on the LCD. To clear the peak
reading, press the HOLD Button once (the display will flash). To exit
this function, press the HOLD Button for at least 2 seconds.
•To record the maximum and minimum measurements, press the REC
MAX/MIN Button and “REC” appears on the LCD.
•Press the REC MAX/MIN. Button again and “REC Max” appears on the
LCD, along with the maximum measurement.
•Press the REC MAX/MIN Button again and “REC Min” appears on the
LCD, along with the minimum measurement.
•To exit this function, press the REC MAX/MIN Button for at least 2
seconds until the display reverts to the current reading.
•Press the POWER Button to turn the unit off.
Notes: Keep the lens cap on the PHOTO SENSOR at all times except
when actually taking a reading. Fluctuations in the reading are generally due
to shadows or fluctuations in the line voltage. Ambient temperature, drafts
and ventilation also affect the luminous flux output. Avoid range overload
and do not store in areas of high temperature and/or humidity. Remove the
battery for long-term storage.
ZERO ADJUSTMENT
With the sensor cover securely in place and the meter turned on, and select
a the 40.00 Lux range (digits appear on the LCD). Press the ZERO button
and the LCD should indicate “0.00”.
BATTERY REPLACEMENT
Replace the battery when the low battery icon is displayed in the
left corner of LCD. In-spec measurements may be made for
several hours after the low battery indicator appears. Remove
the battery compartment screw and slide the cover away from
the meter, remove the battery and replace with a 9V battery (alkaline or
heavy duty type). Replace the cover.
AUTOMATIC SHUT OFF
The instrument has an automatic shut off function in order to prolong battery
life. After approximately 10 minutes without activity (no buttons pushed), the
meter will automatically shut off. To disable this feature, press the REC
Button.
CALIBRATION
To maintain accuracy, annual calibration is recommended. For complete
details and current fees contact SPER SCIENTIFIC Ltd, 7720 East Redfield
Rd, Suite 7 ,Scottsdale, Arizona 85260, USA. Phone: [phone],
web: www.sperscientific.com, email: [e-mail].

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The 16 digits data stream will be displayed in the following format:
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Each digit indicates the following status:
D0 End Word
D1 & D8 Display reading, D1 = LSD, D8 = MSD
E.g: If the display reading is 1234, then D8 to D1 is:
00001234
D9 Decimal Point (DP), position from right to the left
0 = No DP, 1= 1 DP, 2 = 2 DP, 3 = 3 DP
D10 0 = Positive 1 = Negative
D11 & D12 Annunciator for Display
Lux = 15, Ft-cd = 16
D13 The upper display data = 1, The lower display data = 2
D14 4
D15 Start Word
RS232 FORMAT: 9600, N, 8, 1
Meter (3.5 mm jack plug) PC (9W ‘D” Connector)
Center Pin.................................. Pin 4 Pin 2 2.2 K
Ground/shield ............................ Pin 2 Pin 5 resistor
RS232 PC SERIAL INTERFACE
The instrument features RS232 output via a 3.5 mm terminal. The signal
output is a 16-digit data stream that can be adapted to user-defined appli-
cations. A RS232 lead with the following connection is required to link the
instrument with the PC serial interface.

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SPECIFICATIONS
Display Large .19” x 1.5” (52mm x 38mm), 5 digit display
with bar graph indicator.
Measurement and
Ranges
5 Ranges: 40.00 Lux, 400.0 Lux, 4,000 Lux,
40,000 Lux, 400,000 Lux.
Unit of Measure Lux, Foot Candle (Ft-cd)
Overload Indicator "- - - -" is displayed on the left of the LCD
Sensor The exclusive photo diode and color correction
filter, spectrum meets C.I.E.
Cosine correction factor meets the standard.
Power Supply One 9V battery, current approx. DC 8mA
Operating Temperature 32 ~ 122°F (0 ~ 50°C)
Operating Humidity Less than 80% RH
Weight 9.9 oz (280g)
Dimensions Main Unit: 7.9 x 2.7 x 1.2" (200 x 68 x 30mm)
Sensor: 3.2 x 2.2 x 0.3" (82 x 55 x 7mm)
Sensor Lead: Extends to appx. 3½ft
Data Output RS232 serial data output.
Unit of
Measure
Range In-Range Display Res. Accuracy
Lux 40.00 0 ~ 40,000 0.01 ±(3% rdg + 0.5% F.S.)
400.0 36.6 ~ 400.0 0.1
4,000 360 ~ 4,000 1
40,000 3,600 ~ 40,000 10
400,000 10,000 ~ 400,000 100 <100,000 ± (3% rdg +
0.5% F.S.). >100,000
for reference only
Foot
Candle
4.000 0 ~ 3.720 0.00
1
±(3% rdg + 0.5% F.S.)
40.00 3.35 ~ 37.20 0.01
400.0 33.5 ~ 372.0 0.1
4,000 335 ~ 3,720 1
40,000 930 ~ 37,200 10 < 9,300 ± (3% rdg +
0.5% F.S.). >9,3000
for reference only
Accuracy tested by a standard parallel light, tungsten lamp of 2856°K.

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LIGHT SPECTRUM CHART
0
20
40
60
80
100
120
410 430 450 470 490 510 530 550 570 590 610 630 650 670 690 710 730 750
SPER CEI
OPTIONAL ACCESSORIES
840057 RS232 Cable
840090 Water Resistant Instrument Pouch
840092 Bench-Top Tripod
840093 Field Tripod
850080 Software

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Rev. 12/19/03
WARRANTY: Sper Scientific warrants this product against defects in materials
and workmanship for a period of five years from the date of purchase, and agrees
to repair or replace any defective unit without charge. If your model has since
been discontinued, an equivalent Sper Scientific product will be substituted if
available. This warranty does not cover damage resulting from accident, misuse,
or abuse of the product. In order to obtain warranty service, ship the unit postage
prepaid to: SPER SCIENTIFIC LTD. 7720 E Redfield Rd, Suite 7, Scottsdale,
Arizona 85260, USA [phone]. The defective unit must be accompanied by
a description of the problem and your return address. Please be sure to return
your warranty registration card within ten (10) days of purchase.