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T-10/T-10M Illuminance Meters

Illuminance Meter T-10 for standard illuminance measurements and T-10M for small-surface illuminance measurements which used for measurements of a wide range of illuminance.(0.01 to 299,900 lx, 0.001 to 29,990 fcd).

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T-10/T-10M Illuminance Meters


Made in Japan


Compact, light-weight and easy to use multifunctional illuminance Meter

The latest generation of Konica Minolta lux meters, the T-10, replaces the globally successful models of the T-1 series. The small, easy-to-use handheld meters are capable of measuring intermittent light sources, can be connected to each other to form multi-point units and are easily controlled with a PC. They have an extremely large measuring range of 0.01 to 299,000 lx with automatic range switching and a large, backlit LCD. All this with Konica Minolta's renowned high level of precision in a small, compact design.

Areas of application

Konica Minolta lux meters are used whenever brightness and the quantity of ambient light must be measured. Even the measurement of average values and illumination is possible. Examples of their use include the measurement of workplace and street illumination, the production of lamps as well as architectural, forestry, and agricultural applications. Deployment in hard-to-reach spaces and under water are possible, just as the metering of very large surfaces and projectors (ANSI lumens) by serial connection of several receptor heads. Metered values can also be visualized graphically and even fully automated by using the PC software.

Background knowledge

As the names implies, lux meters measure lux (lx). That is the unit of illumination strength E, the light striking a certain location or the lumens (F) illuminating a certain surface (A):

In nature, luminance ranges from about 0.01 lx on a dark night of a new moon to about 100,000 lx on a hot summer day. Workplace illumination is normally around 1000 lx, many standards specify minimum values for the workplace. In some countries, the unit foot candles (fcd) is also used to denote illuminance. Of course, the T-10 will also display these values when desired. 1 fcd = 1 lm/ft2 = 10.764 lx

The T-10 series of lux meters can also monitor the integrated illuminance for up to 9999 hours and then determine the exposure H in lux hours (lxh). That is the measurement for the amount of light that falls onto a certain surface within a certain time (t), for example how much light a plant receives throughout a day:
H = E · t
With the ability to connect up to 30 receptor heads in series, the T-10 series can be built into a system for the measurement of ANSI lumens of projectors. The unit lumen (lm) designates the light energy (F) emitted by the projector. It is measured indirectly over light striking a certain surface using 9 receptor heads.

Basic model T-10

The general purpose unit for most applications. It is based on the same base unit common to all models of the T-10 series with operating panel, analysis unit and display and a removable standard receptor head. This modular concept allows the combination of various receptor heads and the expansion of the unit for adaptation to your measurement tasks.


The most important features at a glance

All models of the T-10 series allow a variety of possibilities for measurement and analysis that leave nothing to be desired. The most important operational functions are accessed using three large buttons. An additional operating panel for less commonly used features is found under a sliding cover. That way, you are not distracted by additional operating elements during everyday work. A large, backlit liquid crystal display shows the measurement values; the illumination is automatically switched on as soon as it gets too dark. The T-10 models offer the following possibilities for analysis:

  • Absolute measurement of illuminance in lux and foot candles.
  • Comparison of illuminance values as a difference or percentage value. The target level can be entered by measurement or manual entry with the keypad.
  • Integrated illuminance (exposure) with a display of the integration time and the illuminance mean value.
  • Other evaluation options with the software T-A30

Other features facilitate daily use of the T-10 even more:

  • Automatic, rapid zero calibration (without cap!) after switching on.
  • Measurement of continuous and intermittent light sources.
  • Very large measurement range of 0.01 to 299,900 lx with automatic range switching. Range switching can also be done manually.
  • Entry of colour correction factors for adaptation to certain light sources.
  • Serial connection of up to 30 receptor heads for multi-point metering.
  • Digital (RS-232C) and analogue output ports for external use of the measurement values.
  • Extensive accessories.

Serial connection

One of the special characteristics of the T-10 series is the ability to connect multiple receptor heads through a serial port. This allows measurements to be taken at several points simultaneously without having to move the instrument. That way, large areas such as movie screens, can be measured easily. With the help of the T-A30 Software you can measure the ANSI lumens of projectors for example.
Up to 30 receptor heads can be connected at once and the measurement values can be called up with the base unit. The individual receptor heads are connected with a common LAN cable (10BASE-T) that can be up to 100 metres long. The various receptor heads are separated from each other and from the evaluation unit.
Multi-point measuring becomes very easy with the T-A30 software. The software also graphically displays the system and allows the simultaneous display of all measurement values.


Spectral luminous efficiency V(l) defines the human eye and instruments should match this spectral response. The chart shows the T-10's remarkable alignment to this standard curve (f1 (CIE) within 8%). With discontinuous emitters, even higher accuracy can be achieved with the colour correction factor. The standard Konica Minolta calibration is performed to standard illuminant A. 
The diffuser in front of the high-grade silicon photo diode is used for the accurate spatial evaluation of the light being measured. The ideal condition is cosine-shaped valuation over the wave angle; the deviation from this is a measure of accuracy. Also in such case the T-10 shows its strengths. The deviation becomes larger only at very high, nearly irrelevant wave angles.

Light wave angle Maximum cosine error 
10° ± 1%
20° ± 1.5%
30° ± 2%
40° ± 3%
50° ± 4%
60° ± 5%
70° ± 8%
80° ± 20%

Small sensor model T-10M

The instrument space is tight. With a receptor head of only 16mm diameter (14 mm diameter measurement area) and a 1 metre long lead, you can measure even hard-to-reach and small spots. The receptor head of the T-10M can be combined into multi-measurement systems with the normal receptor head of the T-10. All other features are identical to the basic model T-10.


Product Overview

  • Relative spectral response
    For the measurement of illuminance, ideally the relative spectral response of the meter should perfectly match the sensitivity of the human eye for photopic vision, as represented by the CIE spectral luminous efficiency V(λ).
  • Cosine correction characteristics
    Since the brightness of the measurement plane is proportional to the cosine of the angle at which the light is incident, the response of the receptor must also be proportional to the cosine of the incidence angle.

Principal Applications

  • Official government testing
  • R&D by illumination manufacturers
  • Repair and maintenance in factories, offices, and hospitals
  • Quality control by manufacturers of home-use lighting products
  • Examination of commercial light sources
  • Illuminance control in agriculture and forestry

Main Features

  • Multiple functions and convenient operation
    The multi-function T-10 also features a key cover to prevent accidental operation.
  • PC linking and continuous storage using a recorder
    Digital output: An RS-232C terminal supports direct connection to a PC.

    Analog output: When connected to a recorder, illuminance values can be stored in a continuous fashion.

  • Automatic zero adjustment for immediate measurement
    As soon as the power is turned on, the T-10 automatically carries out zero adjustment, (even when a cap has not been fitted), thus allowing measurement operations to be started almost immediately.
  • Auto-range functions for a wide measurement range
    Manual setting of ranges is also possible.
  • LCD backlight is automatically controlled for low illuminance and hold.
  • Powered by standard AA-size batteries.
  • Flickering light sources can also be measured.

Features (T-10M)


Highly-portable, handheld design capable of measurements in a wide range of luminance conditions. Flareless SLR (single-lens-reflex) optical system for high-accuracy measurements. Acceptance angle of 1/3&deg; supports measurement of small target areas.


Measurement of the luminance of CRTs, LED, and ELs.
Measurement of road and tunnel brightness
Measurement of railway system signals
Measurement of road and airport signals
Measurement of illumination and outdoor signs


Principal Specifications


Illuminance meter T-10

<standard receptor head>

Illuminance meter T-10M

<mini receptor head>

TypeMulti-function digital illuminance meter with detachable receptor head
ReceptorSilicon photocell
Relative Spectral Response*Within 8% (f1´) of the CIE spectral luminous efficiency V (λ)
Cosine Correction CharacteristicsWithin ±1% at 10° ; Within ±2% at 30° ; Within ±6% at 50° ; Within ±7% at 60° ; Within ±25% at 80°
Illuminance unitsLux (lx) or foot candles (fcd) (switchable)
Measuring rangeAuto range (manual 5 range at the time of analog output)
Measuring functionIlluminance(lx). illuminance difference(lx). illuminance ratio(%). integrated illuminance(lx·h). integration time(h). average illuminance(lx).
Measuring rangeIlluminance ··· 0.01 to 299,900 lx 0.001 to 29,990 fcd
Integrated illuminance ··· 0.01 to 999,900 × 103 lx·h 0.001 to 99,990 × 103 fcd·h / 0.001 to 9999 h
User calibration functionCCF(Color Correction Factor) setting function
Accuracy±2% ±1digit of displayed value (based on Konica Minolta standard)
Temperature/humidity driftWithin ±3% ±1digit (of value displayed at 20°C/68°F ) within operating temperature/humidity range
Digital outputRS-232C
Analog output1mV/digit,3V at maximum reading; Output impedance: 10KΩ; 90% response time: FAST setting: 1ms, SLOW setting: 1s
Display3 or 4 Significant-digit LCD with back-light illumination
Operating temperature /humidity range-10 to 40°C, relative humidity 85% or less (at 35°C) with no condensation
Storage temperature /humidity range-20 to 55°C, relative humidity 85% or less (at 35°C) with no condensation
Power source2 AA-size batteries / AC adapter (optional)
Battery life72 hours or longer (when alkaline batteries are used) in continuous measurement
Dimensions69 ×174 × 35 mm (2-6/16×6-14/16×1-7/16 in.)

Main body : 69 × 161.5 ×30 mm (2-6/16×6-6/16×1-3/16 in.)

Receptor : Φ16.5 × 12.5 (Φ11/16 × 1/2 in.)

Cord length : 1m ( 3.3 in.)

Weight200g (7.0 oz.) without battery205g (7.2 oz.) without battery
Standard accessoriesΦ3.5mm(Φ1/8 in.) subminiature plug for analog output ;
Receptor cap ; Neck strap ; Case ; Battery
Φ3.5mm(Φ1/8 in.) subminiature plug for analog output ;
Neck strap ; Case ; Battery
Optional accessoriesReceptor head ; Adapter for Multi-point ; AC Adapter ; Data processing software


Specifications are subject to change without notice.

*Equivalent to 2% specified for T-1 series. 8% CIE(f1'),new JIS(1993) 2% old JIS