Sper scientific 840021 User manual
Light Meter (Foot Candles)
840021
2 3
Light Meter (Foot Candles) - 840021
Copyright ©2015 by Sper Scientic
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 Scientic.
INTRODUCTION .....................................3
PANEL DESCRIPTION ................................3
MEASUREMENT PROCEDURES ........................4
ZERO ADJUSTMENT & CALIBRATION ...................5
BATTERY REPLACEMENT .............................5
SPECIFICATIONS ....................................6
LIGHT SPECTRUM CHART ............................7
WARRANTY.........................................8
TABLE OF CONTENTS
3
INTRODUCTION
Compact and portable, your new meter can be used to monitor
light levels or check the FC level of a particular light source.
The sensor’s exclusive photo diode and color correction lter
meets the C.I.E. photopic spectrum.
Sper Scientic light meters are cosine corrected for a quick and
accurate response. Large easily legible 4 digit LCD. The meter has
an external zero adjustment, data hold, low-battery indicator, and
a moisture resistant front panel.
Comes with soft carrying case, detachable light sensor,
photo-sensor cover, instructions and a 9-Volt battery.
PANEL DESCRIPTION
1. Sensor Input & Sensor Plug
2. Display
3. On Button
4. Off Button
5. Hold Button
6. 200 Range Button
7. 2000 Range Button
8. Tripod Screw (on back)
9. Stand (on back)
10. Battery Cover (on back)
11. Photo Sensor
12. Zero Setting Terminal
1
2
3
4
5
6
7
8
9
10
11
12
4 5
MEASUREMENT PROCEDURES
1. Insert the SENSOR plug into the SENSOR INPUT socket.
2. Turn the meter on using the ON button.
3. Remove the lens cap from the PHOTO SENSOR.
4. Press the 200 RANGE button for measurements of 0 ~ 199.9
FC, or select the 2000 RANGE button for measurements of
200 ~ 1999.9 FC. If you are uncertain about which range to use,
select the highest range.
5. Range Overload is indicated when “1” appears on the left side
of the display. If this occurs, switch to the highest range or
discontinue use.
6. Point the PHOTO SENSOR toward the source and read the
results on the display. Divide the meter reading by the factor of
.0929 to convert FC results to LUX.
7. 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.
8. Press the OFF 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
uctuations in the line voltage. Ambient temperature, drafts
and ventilation also affect the luminous ux output.
• Avoid range overload and do not store in areas of high
temperature and / or humidity. Remove the battery for
long-term storage.
5
ZERO ADJUSTMENT & CALIBRATION
IMPORTANT: During adjustment, be sure to use only the terminal
marked “ZERO.” The unmarked terminals are for professional
laboratory calibration only. Tampering with the unmarked terminals
will result in inaccurate readings and require professional
calibration of the meter.
1. With the sensor cover securely in place and the meter turned
on, the LCD display should indicate “000” or “00.0” depending
on the selected range.
2. A slight variation will not affect readings; however, if a precise
reading is required you may use the ZERO SETTING terminal
to reset the unit.
3. To make an adjustment, press the 200 RANGE button and
cover the PHOTO SENSOR.
4. Using a small screwdriver, turn the ZERO SETTING terminal
until “00.0” appears on the LCD.
5. To maintain accuracy, annual laboratory calibration
is recommended. For calibration service, contact
SPER SCIENTIFIC.
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 off.
4. Replace the battery with a fresh 9V battery (alkaline or heavy duty).
6 7
SPECIFICATIONS
Unit of
Measure Range Resolution Accuracy
Foot
Candle
200 Range = 0 ~ 199.9 0.1 ±5% + 4 digits
2000 Range = 200 ~ 1999 1
Electronic Specications (23 ± 5°C): Tested under the environment RF Field
Strength less than 3 V/M, and frequency less than the 30 MHz only.
Display Maximum reading 1999
Overload
Indicator “1” is displayed on the left of the LCD
Power Supply One 9V battery, current approx. DC 3mA
Operating
Environment 32 ~ 122°F (0 ~ 50°C), less than 80% RH
Dimensions 7¾" × 2¾" × 1¼" (197 × 70 × 32 mm)
Weight 10 oz (283 g)
7
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
PB8
WARRANTY
Sper Scientic 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 Scientic 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.
05/2015
Table of contents
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