MARTINDALE LM195 User manual

LM195 LED LIGHT METER
INSTRUCTION
MANUAL
ALWAYS READ THESE INSTRUCTIONS BEFORE
PROCEEDING
Thank you for buying one of our products. For safety and a full understanding
of its benefits please read this manual before use. Technical support is
available from 01923 441717 and [email protected].
CONTENTS
1 Safety Information 1
1.1 Meaning of Symbols and Markings 1
1.2 Precautions 2
2 Introduction 3
2.1 Inspection 3
2.2 Description 3
2.3 Accessories 3
2.4 Battery Installation 3
3 Operation 4
3.1 Description of Press Buttons and LM195 Elements 4
3.2 Description of LCD Symbols 5
3.3 Low Battery Indication 5
3.4 Power On/Off 6
3.5 Auto Power Off 6
3.6 Backlight 7
3.7 Min Max 7
3.8 Hold Mode 7
3.9 Unit of Measurement 7
3.10 Auto/Manual reading 8
3.11 Measurement mode 8
3.12 Measurement Considerations 8
3.13 CIE Photopic curve 10
4 Maintenance 12
4.1 Battery Replacement 12
4.2 Calibration 12
4.3 Cleaning 13
4.4 Repair & Service 13
4.5 Storage Conditions 13
5 Warranty 14
Specifications
1. SAFETY INFORMATION
REMEMBER: SAFETY IS NO ACCIDENT
These instructions contain both information and cautions that
are necessary for the correct operation and maintenance of this
product. It is recommended that you read the instructions carefully
and ensure that the contents are fully understood.
Particular attention should be paid to the Precautions and
Technical Specifications.
Please keep these instructions for future reference. Updated
instructions and product information are available at:
www.martindale-electric.co.uk
1.1 Meaning of Symbols and Markings
Caution - refer to instructions
Equipment complies with relevant EU Directives
End of life disposal of this equipment should be in
accordance with relevant EU Directives.
12
1.2 Precautions
Please pay attention to the following cautions before use.
Cautions
The LM195 must only be used under the conditions and for the
purposes for which it has been constructed and specified.
Before use, check the unit for cracks or any other damage. Make
sure the unit is free from dust, grease and moisture. Do not use if
damaged.
Avoid severe mechanical shock or vibration and extreme
temperature.
To avoid possible corrosion from leaking batteries, remove the
batteries if discharged or when the unit is not in use for an extended
period.
Keep the plastic domed cosine corrector covered by the protective
cover supplied when not in use.

3
2. INTRODUCTION
2.1 Inspection
Examine the shipping carton for any sign of damage. Inspect the
unit and any accessories for damage. If there is any damage then
consult your distributor immediately.
2.2 Description
The LM195 has the following functions and features:
Light intensity measurement to 199900 lux, 19990 fc
Spectral response: CIE photopic
Hold, Max and Min functions
Auto power off
Low battery indication
LCD display with backlight
2.3 Accessories
The LM195 comes with the following accessories:
2 x 1.5V AA batteries
Protective case for safe storage
Instructions
2.4 Battery Installation
Refer to Section 4.1 (Battery Replacement).
4
3. OPERATION
3.1 Description of Press Buttons and LM195 Elements
1 Sensor cap location
2 Sensor cap
3 LCD display
4 Turns the LM195 on/off
5Turns the backlight on/off
6HOLD The user can hold the measured value displayed on the screen
7
MIN
MAX The user can change between, max, min and current readings
8RANGE Enables the user to select the preferred measuring range
9fc/lx Changes the unit of measurement between Foot Candle & Lux
10 Batttery cover
11 SET Set-up button
5
3.2 Description of LCD symbols
Battery capacity indicator
Auto power off is active
MIN Minimum recorded reading is displayed
MAX Maximum recorded reading is displayed
HOLD Hold mode is active
lx fc Units of measurement being displayed
Range Range indicator
Auto Range Auto range is active
3.3 Low Battery Indication
If the symbol is displayed, the battery needs replacing as
measurement accuracy can no longer be guaranteed (See section
4.1 Battery Replacement).
6
3.4 Power On/Off
The LM195 will perform a self-test calibration check when powered
up. This requires a completely dark environment so the protective
sensor cap must be left on the sensor when the meter is powered
up.
With the sensor cap fitted, press to start the self-test. CAP will
flash on the LCD for a few seconds, followed by CAL. Once a value
of 0.0 appears on the LCD, the calibration is complete. Remove the
sensor cap and place it behind the sensor head on the fixing mount.
The LM195 is now ready for use. To switch off the LM195, press the
button and hold for 3 seconds until the unit has powered off.
Please note: If ERR1 appears on the LCD during the self-test
calibration, check that the sensor cap is securely fixed over the
sensor and start the Power-On process again.
3.5 Auto Power Off (APO)
If the unit is inactive for a period of 30 minutes, it will automatically
power off.

To disable this function, press and hold the HOLD button while
pressing the button. Release both buttons and the LM195 will
perform the self-test. The symbol will disappear from the LCD to
confirm the auto power off is disabled.
3.6 Backlight
Press the button to turn on the display backlight. It will
automatically turn off after 30 seconds if there is no further
operation of the unit.
3.7 Min/Max
Press the MIN
MAX button to enable the MIN/MAX mode. By pressing
the MIN
MAX button, the user can select between the minimum,
maximum and current readings. If the LM195 is to be left monitoring
lux levels over a period of time greater than 30 minutes, please
note that Auto power off function will need to be disabled first (see
section 3.5). Failure to disable the Auto power off will result in the
LM195 switching off while recording lux levels. To exit MIN/MAX
mode, hold the MIN
MAX button for 3 seconds and the MIN & MAX
symbols will disappear to confirm the function is disabled.
3.8 Hold Mode
To enter the HOLD mode, press the HOLD button while in
measurement mode. The HOLD symbol will appear on the LCD. To
exit display hold, press the HOLD button again.
3.9 Unit of Measurement
Press the fc/lx button to change the unit of measurement between
Foot Candle (fc) and Lux (lx).
7
3.10 Auto/Manual Ranging
The LM195 defaults to Auto range and selects the lowest range
available. The user can select a different measuring range by
pressing the RANGE button.
The available ranges are:
AUTO, 200, 2000, 20000, 200000 lx
AUTO, 20, 200, 2000, 20000 fc
3.11 Measurement Mode
The LM195 has preset correction factors which can be applied to
ensure accurate measurements for different light sources:
L0 – Standard incandescent light source
L1 – LED white daylight (5000K)
L2 – LED AMBER (yellow) light (3000K)
L3 – LED GREEN light
L4 – LED RED light
L5 – LED BLUE light
L6 – Warm white fluorescent lamp (2700K)
L7 – Cold white fluorescent lamp (6500K)
L8 – User adjustable mode
Press the SET button and use the and buttons to select the
required light source correction factor setting. Once selected, press
the SET button to save the setting.
Hold the LM195 so the light sensor is directed toward the light
source (see note 3.12). Read the measured light intensity from the
display.
3.12 Measurement Considerations
Keep the plastic domed sensor clean and free of scratches. It may
be cleaned with a soft cloth and isopropyl alcohol.
8
The light level measurement should be taken at the application
height. For light level measurements at a work station, the LM195
should be positioned at desk height. When measuring a work area
or corridor, it should be placed on the floor.
It is important that the light source completely fills the sensor with
minimal movement of the meter during measurement.
It is also advisable where possible to hold the LM195 away from
your body when taking measurements to avoid reflections or
creating a shadow on the sensor. The light sensing probe can be
detached from the LM195. Avoid flexing the cable excessively at
either end of the cable. For best accuracy, repeat the measurement
several times to ensure that the light source has remained stable.
The Inverse-square Law
The illuminance E at a point on a surface varies directly with the
intensity I of a point source, and inversely as the square of the
distance d between the source and the point. If the surface at
the point is normal to the direction of the incident light, the law is
expressed by E = I/d2.9
Cosine Law
The illuminance on any surface varies as the cosine of the angle
of incidence. The angle of incidence ѳ is the angle between the
normal to the surface and the direction of the incident light. The
inverse-square law and the cosine law can be combined as
E = (I cos ѳ)/d2
Spectral Mismatch Correction Factor
Spectral mismatch is the result of the differences between the
relative spectral responsivity of a light meter’s sensor and the CIE
photopic curve it is designed to simulate, when the light meter is
used to measure a light source with a different relative spectral
power distribution to that of the light source used to calibrate the
light meter.
The LM195 has been calibrated against a standard tungsten light
source at a correlated colour temperature of 2856K.
3.13 CIE Photopic Curve
10

11
Wavelengh
(nm)
CIE photopic
luminous effi-
ciency
coefficient
VO
Photopic
lumen/watt
conversion
factor
380
390
400
410
420
430
440
450
460
470
480
490
500
510
520
530
540
550
555
560
570
580
590
600
610
620
630
640
650
660
670
680
690
700
710
720
730
740
750
760
0.00004
0.00012
0.00040
0.00121
0.00400
0.01160
0.02300
0.03800
0.06000
0.09098
0.13902
0.20802
0.32300
0.50300
0.71000
0.86200
0.95400
0.99495
1.00000
0.99500
0.95200
0.87000
0.75700
0.63100
0.50300
0.38100
0.26500
0.17500
0.10700
0.06100
0.03200
0.01700
0.00821
0.00410
0.00209
0.00105
0.00052
0.00025
0.00012
0.00006
0.027
0.082
0.270
0.826
2.73
7.92
15.71
25.95
40.98
62.14
94.95
142.1
220.6
343.5
484.9
588.7
651.6
679.6
683.0
679.6
650.2
594.2
517.0
431.0
343.5
260.2
181.0
119.5
73.08
41.66
21.86
11.61
5.61
2.80
1.43
0.715
0.355
0.170
0.082
0.041 12
4. MAINTENANCE
4.1 Battery Replacement
The battery compartment is on the rear of the unit. To gain access,
undo the retaining screw and lift the cover away from the back of
the unit.
Replace with 2 new AA batteries (IEC LR6, NEDA 15A), observing
correct polarity. Replace the battery cover.
Note: Do not mix old and new batteries.
4.2 Calibration
To maintain the integrity of measurements made using your
instrument, Martindale Electric recommends that it is returned
at least once a year to an approved Calibration Laboratory for
recalibration and certification.
Martindale Electric is pleased to offer you this service.
Please contact our Service Department for details.
Email: [email protected]
Tel: [phone]
13
4.3 Cleaning
If contamination is found, clean with a damp soft cloth and if
necessary a mild detergent or alcohol. Do not use abrasives,
abrasive solvents, or detergents which can cause damage to the
unit. If a mild detergent is used, the unit should subsequently
be thoroughly cleaned with a water dampened soft cloth. After
cleaning, dry and allow to remain in a dry environment for 2 hours
before use.
4.4 Repair & Service
There are no user serviceable parts in this unit other than those
that may be described in section 4. Return to Martindale Electric
if faulty. Our service department will quote promptly to repair any
fault that occurs outside the guarantee period.
Before the unit is returned, please ensure that you have checked
the unit and batteries.
4.5 Storage Conditions
The instrument should be kept in warm dry conditions away from
direct sources of heat or sunlight, and in such a manner as to
preserve the working life of the unit. It is strongly advised that the
unit is not kept in a tool box where other tools may damage it.
14
5. WARRANTY AND LIMITATION OF LIABILITY
This Martindale product is warranted to be free from defects in
material and workmanship under normal use and service. The
warranty period is 2 years and begins on the date of receipt by the
end user. This warranty extends only to the original buyer or end-
user customer, and does not apply to fuses, disposable batteries,
test leads or to any product which, in Martindale’s opinion, has been
misused, altered, neglected, contaminated, or damaged by accident or
abnormal conditions of operation, handling or storage.
Martindale authorised resellers shall extend this warranty on new and
unused products to end-user customers only but have no authority to
extend a greater or different warranty on behalf of Martindale.
Martindale’s warranty obligation is limited, at Martindale’s option, to
refund of the purchase price, free of charge repair, or replacement of
a defective product which is returned to Martindale within the warranty
period.
This warranty is the buyer’s sole and exclusive remedy and is in lieu
of all other warranties, expressed or implied, including but not limited
to any implied warranty of merchantability or fitness for a particular
purpose. Martindale shall not be liable for any special, indirect,
incidental or consequential damages or losses, including loss of data,
arising from any cause or theory.
Since some jurisdictions do not allow limitation of the term of
an implied warranty, or exclusion or limitation of incidental or
consequential damages, the limitations and exclusions of this warranty
may not apply to every buyer. If any part of any provision of this
warranty is held invalid or unenforceable by a court or other decision-
maker of competent jurisdiction, such holding will not affect the validity
or enforceability of any other provision or other part of that provision.
Nothing in this statement reduces your statutory rights.

Specification
LM195
LED Light Meter
All specified accuracies are at 25°C ±1°C, <80% R.H. for 1 year
Temperature coefficient: 0.1 x (specified accuracy) per °C
(0-24°C, 26-40°C)
Accuracy: ±3% rdg ±5 dgts (Standard A light source) Note 1
±8% (other visable light sources)
Spectral response: CIE photopic Note 2
Range: 0.0 to 199.9/1999/19990/199900 lx
0.00 to 19.99/199.9/1999/19990 fc
Resolution: 0.1lx, 0.01fc
Angle deviation from cosine characteristics error:
10° ± 1% 30° ± 2%
60° ± 5% 80° ± 20%
Light detector: SI photodiode
Note 1: The CIE standard illuminant A can be realized by means
of CIE standard source A, which is defined as: A gas-filled
tungsten-filament lamp operating at a correlated colour
temperature of 2856K.
Note 2: The CIE photopic curve is an international standard for the
colour response of the average human eye.
Specification
LM195
LED Light Meter
PRESET LIGHT SOURCE WEIGHTING
Preset Light Source Weighting:
L0: Standard Incandescent Light Source
L1: LED White Daylight
L2: LED Amber (Yellow) Light
L3: LED Green Light
L4: LED Red Light
L5: LED Blue Light
L6: Warm White Fluorescent Lamp
L7: Cold White Fluorescent Lamp
L8: User Setup Mode
GENERAL
Display: liquid crystal display
Sampling rate: twice per second
Over range: OL is displayed
Power: 2 x 1.5V AA alkaline batteries (IEC LR6, NEDA 15A)
Continuous operating time: approximately 80 hours
Auto power off: after 30 minutes (can be disabled)
Dimensions: 169 (L) x 63 (W) x 37mm (H)
Weight: 185g including batteries
Includes: storage case, 2 x 1.5V AA batteries and instruction manual.
ENVIRONMENTAL
Temperature & Humidity (Operating): 0°C to 40°C d80% R.H.
(Storage): -10°C to 50°C d70% R.H. with
batteries removed
Altitude: up to 2000m
Pollution degree: 2
EMC: Conforms to BS EN 61326-1
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Tel: [phone] Fax: [phone]
E-mail: [email protected]
Website: www.martindale-electric.co.uk
© Martindale Electric Company Ltd. 2018
Registered in England No. 3387451. Rev 2 LIT195