User's Guide
Datalogging Light Meter
with PC Interface
Model 401036
Warranty
EXTECH INSTRUMENTS CORPORATION
warrants this instrument to be free of defects
in parts and workmanship for
one year
from date of shipment (a six month limited warranty
applies to sensors and cables). If it should become necessary to return the instrument for
service during or beyond the warranty period, contact the Customer Service Department at
(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact
information. A Return Authorization (RA) number must be issued before any product is
returned to Extech. The sender is responsible for shipping charges, freight, insurance and
proper packaging to prevent damage in transit. This warranty does not apply to defects
resulting from action of the user such as misuse, improper wiring, operation outside of
specification, improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness for a specific
purpose and will not be liable for any direct, indirect, incidental or consequential damages.
Extech's total liability is limited to repair or replacement of the product. The warranty set
forth above is inclusive and no other warranty, whether written or oral, is expressed or
implied.
Introduction
Congratulations on your purchase of the Extech 401036 Datalogging Light Meter. This
device measures light intensity to 20,000 Foot-candles (Fc) or Lux. 16,000 measurement
readings can be logged by the meter and later transferred to PC using the RS-232
interface. Real-time meter/PC logging is also supported. Careful use of this meter will
provide years of reliable service.
Specifications
Display
Sensor
Ranges / Resolution
Accuracy
Repeatability
Datalogger memory
PC Interface
Range status indication
Sampling time
Power Supply
Operating temperature
Operating Humidity
Weight
Dimensions
Accessories
3 ½ digit (2000 count) multifunction LCD display
Silicon Photo-diode meets C.I.E. photopic curve V (
λ
)
19.99, 199.9, 1999, and 1999 x 10 Fc and Lux
± (3% reading + 5 digits)
± 2%
16,000 readings max.
RS-232C Serial Communications at 9600 bps
'OL' is displayed for measurement exceeding published limits
2.5 readings per second
9V battery (display includes low battery indicator);
50 hour typical battery life
32 to 104 F (0 to 40 C)
< 80% RH
9.6 oz. (300g)
Meter: 5.7 x 2.8 x 1.5" (146 x 70 x 39mm);
Probe: 3.4 x 2.4 x 1.1" (87.5 x 60 x 29mm)
Carrying case, Windows
9V battery
TM
o
o
software, PC Interface cable, &
2
Model 401036 Version 3.1 9/07
Meter Description
1. 2000 Count LCD includes LUX, Fc, low battery, MAX, H (hold), & x10 indicators
2. ON/OFF key Turns the meter on or off
3. Max. Hold key When pressed, the LCD
displays only the maximum reading
4. Lux/Fc key Press to toggle the displayed
unit of measure. The LCD shows the
unit
5. Light Sensor (Lens cover not shown)
Collects light. Note that a tripod mount
is located on the rear of the sensor
6. Range key Press repeatedly to select
desired range: 20, 200, 2,000, 20,000
7. Data Hold key Press to freeze the
displayed measurement
8. Record/Erase key Press momentarily to
store one reading; Press and hold for 3
seconds to activate the continuous
recording mode. Press again to end
recording
9. RS-232 jack Stereo jack for PC to Meter
connection cable
10. Zero adjust Cover the sensor with
supplied lens cap and adjust the zero
pot for a 0.0 Fc/LUX display
Note that the battery compartment, tilt stand, and hanging mount are located on the rear of
the meter
1
2
3
4
6
7
8
9
10
5
Spectral Sensitivity Curve
= Light Meter
100
Relative
Sensitivity (%)
80
60
40
20
= V (
λ
)
400
450
500
550
600
650
700
Wavelength (nm)
3
Model 401036 Version 3.1 9/07
Operation
1. Turn the meter ON or OFF with the ON/OFF key.
2. Press the Lux/Fc key to select the unit of measure for light intensity.
3. With the lens cap completely covering the light sensor, zero the meter by adjusting the
screw on the right side of the meter for an LCD reading of 0.0.
4. Remove the lens cap to allow the sensor to collect light.
5. Read the light intensity measurement on the LCD.
6. For over-range conditions, the ‘OL’ icon will display. Select a higher range by pressing
the Range key until a valid reading replaces the ‘OL’ display.
7. For the 20,000 range, multiply the displayed reading by a factor of 10.
Data Hold
Press the HOLD key to freeze the displayed reading. Press HOLD again to return to the
normal operating mode.
Maximum (MAX) reading
Press the MAX key to display only the highest reading. As higher measurements are made
the display updates accordingly. The ‘MAX’ icon appears on the LCD in this mode of
operation. To return to normal operation, press the MAX key again and the MAX indicator
will extinguish.
Range selection
Press the RANGE key to select the appropriate measurement range. Start with the lowest
range (20) and work up to higher ranges as needed. If ‘OL’ (overload) is displayed, press
the range key until a valid reading is displayed.
Datalogger
REC/ERASE Key
The REC/ERASE key is used to record and erase data. Press the REC/ERASE key once
to log one reading (REC icon flashes once on the LCD). To automatically datalog readings
at programmable intervals (continuous recording mode), press and hold the REC/ERASE
key for 3 seconds (REC icon begins flashing repeatedly).
Press the REC/ERASE key any time while recording to exit the record mode. When the
memory is full (16,000 readings or 255 sets), the LCD will display ‘FULL’ and recording
ends. To download and view the stored data, connect the meter to a PC and perform the
steps provided in the ‘PC Interface’ section of this manual.
To erase stored data, perform these steps:
1. With the meter turned off, press and
hold
the REC/ERASE key.
2. Turn the meter on by pressing the ON/OFF key and then immediately release the
ON/OFF key.
3. Continue to hold the REC/ERASE key until ‘del’ flashes 3 times on the LCD. The meter
automatically returns to normal operation after the data are erased.
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Model 401036 Version 3.1 9/07
Sampling Rate
The sampling rate is the interval of time between logged readings. Note that there are
two
sampling rate selections for two separate datalogging scenarios described below:
1. PC Sampling Rate
The PC sampling rate is the rate at which measurements are recorded by the PC
while the meter is connected to the PC.
This is known as real-time recording since
the readings are being taken by the meter and recorded by the PC at the same
time. Set the rate in the supplied software program as described in the PC
SAMPLING paragraph on page 6.
2. Datalogger Sampling Rate
This is the meter’s internal sampling rate used when the meter is logging readings
remotely in continuous recording mode (disconnected from the PC). The default
rate is 1 second. Change the rate in software by following the steps on page 6 for
SAMPLING TIME with the meter connected to the PC.
PC Interface
Connect the supplied interface cable to the phono jack on the right side of the light meter
and to the PC 9-pin COM port.
Windows
TM
Software
Refer to separate instructions supplied on the Software Program disk for the operation of
TM
the Windows Software.
5
Model 401036 Version 3.1 9/07
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