Sper scientific 840020 User manual

Light Meter (Lux/FC)
840020

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Light Meter (Lux/FC) - 840020
Copyright ©2015 by Sper Scientic
ALL RIGHTS RESERVED
Printed in the USA
The contents of this manual may not be reproduced or transmitted
in any form or by any means electronic, mechanical, or other
means that do not yet exist or may be developed, including
photocopying, recording, or any information storage and retrieval
system without the express permission from Sper Scientic.
INTRODUCTION .....................................3
PANEL DESCRIPTION ................................3
OPERATING INSTRUCTIONS...........................4
GENERAL MEASUREMENT..........................4
HOLD & PEAK HOLD ...............................4
RECORD MAX/MIN.................................5
NOTES & PRECAUTIONS............................5
ZERO ADJUSTMENT & CALIBRATION ...................5
BATTERY REPLACEMENT .............................6
RS232 SERIAL INTERFACE ............................6
SPECIFICATIONS ....................................7
WARRANTY.........................................8
TABLE OF CONTENTS

3
INTRODUCTION
Monitor light levels anywhere with fast, stable and accurate
response. Results are easily read on the extra large LCD with
bar graph, low battery and over range indications. The color and
cosine corrected sensor meets C.I.E. photopic spectrum. Also
features RS232 computer output, max-min, auto power o󰀨, zero
adjustment, hold function and a tripod back.
Comes ready to use with a 9V battery, instructions, soft padded
case, and a detachable sensor with cover for easier replacement
or repair.
PANEL DESCRIPTION
1. Sensor Input & Sensor Plug
2. Display
3. Power Button
4. Hold Button
5. Rec. Min/Max Button
6. Lux/FC Button
7. Range Button
8. Zero Button
9. Tripod Screw (on back)
10. Stand (on back)
11. Battery Cover (on back)
12. Photo Sensor
13. RS232 Cover (on side)
14. RS232 Output (on side)
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4
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OPERATING INSTRUCTIONS
Measurement Procedures
1. Insert the SENSOR plug into the SENSOR INPUT
and turn the meter on by pressing the POWER button.
2. Remove the lens cap from the PHOTO SENSOR.
3. Select the desired unit of measure by pressing the
LUX/FC button.
4. 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 o󰀨ers the highest resolution (most number of digits
after the decimal point).
5. Point the PHOTO SENSOR toward the source and read
the results on the display.
6. The instrument has an automatic shut o󰀨 function in order to
prolong battery life. After approximately 10 minutes without
activity (no buttons pushed), the meter will automatically shut
o󰀨. To disable this feature, press the REC MAX/MIN button.
7. Press the POWER button to manually turn the meter o󰀨.
Hold
1. During measurement, press HOLD to freeze the measured value.
2. “HOLD” and the value are displayed.
Peak Hold
1. During measurement, press the HOLD button for 2 to 3 seconds.
2. “Peak HOLD” and the peak value are displayed and updated
if exceeded.
3. To erase the peak value, press the HOLD button once
(the display will ash).
4. To exit this function, press the HOLD button for at least 2 seconds.

5
Record Maximum / Minimum
1. Press the REC MAX/MIN button once to enter the recording
mode. “REC” and the recorded values are displayed and
continuously updated.
2. Press the REC MAX/MIN button as needed to view the
recorded Max and Min values. “REC Max” and the maximum
recorded value or “REC Min” and the minimum recorded value
are displayed.
Note...
The Max/Min values are frozen and not updated until the meter
returns to recording mode.
3. To return to recording mode, press the HOLD button.
“REC” is displayed without “Max” or “Min”.
4. To erase the recorded Max/Min values and exit the recording
mode, press the REC MAX/MIN button for at least 2 seconds.
Notes and Precautions
• Avoid range overload.
• When using PEAK HOLD or REC MAX/MIN your measurements
must be within the selected range, if not, the out of range
indicator “- - - -” will be displayed.
• Cover the PHOTO SENSOR with the sensor cap when the
meter is not in use.
• Fluctuations in the reading are often due to shadows or a
weak battery. Also, ambient temperatures and drafts may
a󰀨ect the reading.
• Do not store in areas of high temperature and/or humidity.
• Remove the battery for long-term storage.
ZERO ADJUSTMENT AND CALIBRATION
1. With the sensor cover securely in place and the meter
turned on, use the RANGE button to select the 40.00 Lux
range (digits appear on the LCD).
2. Press the ZERO button and the “0.00 LUX” should be displayed.
3. To maintain accuracy, annual laboratory calibration is
recommended and available from Sper Scientic.

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BATTERY REPLACEMENT
1. Replace the battery when the low battery icon is displayed.
2. In-spec measurements may be made for several hours after the
low battery indicator appears.
3. Remove the BATTERY COVER screw and slide the cover o󰀨.
4. Replace the battery with a fresh 9V battery (alkaline or heavy duty).
RS232 PC SERIAL INTERFACE
Use a small screwdriver to gently lift the RS232 COVER up to
expose the RS232 OUTPUT 3.5 mm terminal. The signal output
is a 16-digit data stream that can be adapted to user-dened
applications. A RS232 lead with the following connection is
required to link the instrument with the PC serial interface.
Meter (3.5 mm jack plug) PC (9W “D” Connector)
Center Pin . . . . . . . . . . . . .Pin 4 Pin 2 2.2K
Ground Shield . . . . . . . . . . .Pin 2 Pin 5 resistor
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: 9600, N, 8, 1

7
SPECIFICATIONS
Unit of
Measure Range In-Range Display Resolution Accuracy
Lux
40.00 0 to 40,000 0.01 ±(3% rdg + 0.5%
F.S.)
400.0 36.6 to 400.0 0.1
4,000 360 to 4,000 1
40,000 3,600 to 40,000 10
400,000 10,000 to 400,000 100
<100,000 ± (3%
rdg + 0.5% F.S.).
>100,000 for
reference only
Foot
Candle
4.000 0 to 3.720 0.001
±(3% rdg +
0.5% F.S.)
40.00 3.35 to 37.20 0.01
400.0 33.5 to 372.0 0.1
4,000 335 to 3,720 1
40,000 930 to 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.
Out of Range
Indicator
“- - - -” appears at the top of the display for over-range,
or at the bottom of the display for under-range.
Power Supply One 9V battery, current approx. DC 8mA
Operating Environment 32 to 122°F (0 to 50°C), Less than 80% RH
Dimensions 7¾" × 2¾" × 1¼" (197 × 70 × 32 mm)
Weight 10 oz (283 g)

PB8
WARRANTY
Sper Scientic warrants this product against defects in materials and
workmanship for a period of ve (5) 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 Scientic product will be
substituted if available. This warranty does not cover probes, batteries,
battery leakage, or damage resulting from accident, tampering, misuse,
or abuse of the product. Opening the meter to expose its electronics will
break the waterproof seal and void the warranty.
To obtain warranty service, ship the unit postage prepaid to:
SPER SCIENTIFIC LTD.
8281 East Evans Road, Suite #103
Scottsdale, AZ 85260
The defective unit must be accompanied by a description of the
problem and your return address. Register your product online at
www.sperwarranty.com within 10 days of purchase.
rev 7/6/2017
LIGHT SPECT RUM CHART
0
20
40
60
80
100
120
4
1
0
4
3
0
4
5
0
4
7
0
4
9
0
5
1
0
5
3
0
5
5
0
5
7
0
5
9
0
6
1
0
6
3
0
6
5
0
6
7
0
6
9
0
7
1
0
7
3
0
7
5
0
SPER CEI
LIGHT SPECTRUM CHART