TEK J1820 LumaColor TM Photometer

Features

• Interchangeable Pre-calibrated Heads
• Accurate Spectral and Cosine Corrections
• Metric and English Units User Selectable.
• Large LCD with Backlight
• Rugged
• Handheld
• Adaptable to Many Light Measurement Needs
• Battery Operated

• Real-time Color Measurements
• Ten Memories for Storing Reference Colors (with J1810 color head)
• RGB Bar Graphs
• D6500 Kelvin Calibration
• Color Temperature Measurement
• Full Control of Measurements and Output of Results (RS-232)
• Analog Output

• Automobile Lighting
• Aircraft Lighting
• Computer and Television Manufacturing and Service
• Medical Lighting
• Commercial and Industrial Lighting
• Photographic Equipment Manufacturing

The Tektronix J17 and J18 are handheld digital Photometers/Radiometers/Colorimeters for the laboratory, field or production area. A J17/J18 System consists of a J17/J18 handheld meter and one of seven interchangeable heads. At the heart of the J17/J18 is a microprocessor capable of performing several functions: Metric-to-US conversion, auto-range, auto zero, hold and conversion between color coordinate systems. The J17/J18 can be used with a PC for automated testing and data recording. The J17/J18 are powered by a 9-volt battery.

Pre-calibrated plug-in heads measure illuminance, luminance and color using CIE coordinates (u' v' or xy). All heads use spectrally corrected silicon photodiodes with multi-element glass filters for long-term stability and accuracy. Connection of a head to the J17/J18 automatically selects the correct measurement units. The backlit liquid crystal display can be read easily in dark locations.

• Video and projection screens
• Surface reflectance
• Computer displays

The J1803 measures luminance, in candelas/m² (nits) or footlamberts, where light scattered or emitted by a surface must be measured. Spectral response is matched to the CIE photopic curve with an f₁' value of less than 3%, ensuring accurate results even when measuring spectrally different light sources.

Per CIE publication 69.

The 8° acceptance angle is determined by internal field-stop apertures.

• Output of red, yellow, green and blue LEDs

The J1805 measures luminous intensity in candelas or millicandelas.

Inserts are supplied to fit common sizes of LEDs. These plastic inserts can be modified by the user for other LED sizes or similar light sources.

• Display color balance

The J1806 is useful for quickly verifying or resetting color balance once initial color characterization has been done using the J1820 or J1810.

• Highway illumination
• Luminaires and lamps
• Workstation illumination
• Lighting for safety

The J1811 is an illuminance head with readout in footcandles or lumens/m² (lux). An integral cosine diffusor corrects the angular response to 180° for an f₂ of 3% or less.

• Laser experiments
• Infrared LED testing

The J1812 measures irradiance in milliwatts/m² or output power in milliwatts. The spectral response is flat 8% from 450 to 950 nanometers. The response is typically down 50% at 400 and 1030 nm.

• Color monitor chromaticity and white balance
• Color temperature

The J1810 and J1820 measure color coordinates in the 1931 CIE and 1976 CIE-UCS chromaticity systems. Color coordinates are automatically computed and displayed in either x and y or u' and v' units. Luminance in candela/m² or foot lamberts may also be measured. The J1820 works with the J17; the J1810 provides similar performance plus real-time color measurements, correlated color temperature measurement and programmable control of the J18.

Specifications