• Provides multi functions and user-friendly features
• Allows connection with a personal computer and continuous recording of illuminance by a recorder
• Quick automatic zero adjustment
• Auto ranging
• LCD back-light
• Uses 9v batteries

• Lighting engineers and specifiers.
• R&D at light products manufacturers.
• Inspection of light sources at construction sites, government and educational facilities.
• Maintenance of lights in factories, offices, and hospitals
• Electrical product manufacturers.
• Quality control of light sources at home.
• Agricultural and forestry industries .

Model No.

UM-250

UM-360

UM-400

Type

Irradiance meter with interchangeable receptor heads for measuring UV radiation

Receptor

heads

Receptor

Silicon photodiode

Spectral response

220~300nm

310~400nm

360~480nm

Peak wavelength

250±10nm

365±5nm

415±5nm

30°

Within ±3%

Within ±3%

Within ±3%

60°

Within ±15%

Within ±15%

Within ±15%

Measurement modes

Irradiance ; integrated irradiance* and integration time* ;

irradiance difference* ; percent irradiance* 

Irradiance measuring range

 0.1~199,900µW/cm² in four automatically selected ranges

Integrated irradiance range*

Maximum approx. 100,000mJ/cm² measurable (in 9,999 display cycles)

Integration time*

999,900sec. (288h)

Linearity

Within ±5% of reading = 1 digit

Temperature / humidity drift

Within ±3%±1 digit (of value displayed at 23°C / 73.4℉) Within operating temperature

/ humidity range

Digital output

RS-232C 2400BPS

Analog output

0 to 3V ; 1mV / digit

Display

4-digit LCD

Operating temperature / humidity range

0 ~ 40°C , relative humidity 85% or less (at 35°C) with no condensation

Storage temperature / humidity range

-20 ~ 55°C , relative humidity 85% or less (at 35°C) with no condensation

Power source

One 9V battery or optional AC adapter

Dimensions

73.5 x 186 x 33 mm (2-7.8x7-5 / 16x1-5 / 16 in)

Weight

270g (9.5 oz.) including battery

Standard accessories

Case ; Cap ; Strap ; Analog output plug

* Available only with optional Expansion Keyboard UM-A25 attached.

  Specifications are subject to change without notice.